Redraw Fragment in View after initialising Google Map - Android

Redraw Fragment in View after initialising Google Map - Android - java

I want to display a Google Map on half screen of my profile view. In my onCreate method I created a new instance of an AsyncTask to retrieve latitude and longitude from Google servers via JSON. After receiving the result, I call:
GoogMapHandler gmh = new GoogMapHandler(fragmentManager, applicationContext);
gmh.initilizeMap(coord, "Username", "addressInfo");
Here is my GoogMapHandler class:
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.content.Context;
import android.widget.Toast;
import android.support.v4.app.FragmentManager;
import android.util.Log;
import com.google.android.gms.internal.fm;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
public class GoogMapHandler {
// Google Map
private GoogleMap googleMap;
private android.support.v4.app.FragmentManager fragmentManager;
private Context applicationContext;
public GoogMapHandler(FragmentManager fmanager, Context applicationContext) {
this.fragmentManager = fmanager;
this.applicationContext = applicationContext;
}
public void initilizeMap(LatLng coord, String username, String addrInfo) {
if (googleMap == null) {
Fragment fragment = this.fragmentManager.findFragmentById(R.id.map);
FragmentTransaction fragTransaction = this.fragmentManager
.beginTransaction();
fragTransaction.detach(fragment);
SupportMapFragment supportmapfragment = (SupportMapFragment) fragment;
googleMap = supportmapfragment.getMap();
if (googleMap == null) {
Toast.makeText(applicationContext,
"Sorry! Unable to create map.", Toast.LENGTH_SHORT)
.show();
} else {
Marker loc = googleMap.addMarker(new MarkerOptions()
.position(coord).title("User: " + username)
.snippet(addrInfo));
googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(coord,
15));
fragTransaction.attach(fragment);
fragTransaction.commit();
}
}
}
}
Now the problem is, that I can't see the map, although I get no errors. As the View is already created, I tried to to "redraw" the fragment to display the map, but it's not working.
How can I achieve this?
Any help would be greatly appreciated.
EDIT:
Here is my ProfileActivity. As suggested, I used onResume to create the AsyncTask.
public class ProfileActivity extends BaseActivity {
private String username, address, postalCode, country;
#Override
protected void onResume() {
Log.i("URL",
"http://maps.googleapis.com/maps/api/geocode/json?address="
+ address.replaceAll("\\s+", "+") + ",+" + postalCode
+ ",+" + country + "&sensor=false");
new LocationTask(getSupportFragmentManager(),
getApplicationContext())
.execute("http://maps.googleapis.com/maps/api/geocode/json?address="
+ address.replaceAll("\\s+", "+")
+ ",+"
+ postalCode
+ ",+" + country + "&sensor=false");
super.onResume();
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_profile);
Intent intent = getIntent();
username = intent.getStringExtra(SearchResultsActivity.USERNAME);
if (username != null) {
setTitle("User: " + username);
}
address = intent.getStringExtra(SearchResultsActivity.ADDRESS);
postalCode = intent
.getStringExtra(SearchResultsActivity.POSTALCODE);
country = intent.getStringExtra(SearchResultsActivity.COUNTRY);
TextView textView = new TextView(this);
textView.setTextSize(40);
textView.setText(username);
setContentView(textView);
}
}
Profile Layout:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<FrameLayout
android:id="#+id/map_frame"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1.2" >
<fragment
android:id="#+id/map"
android:name="com.google.android.gms.maps.MapFragment"
android:layout_width="fill_parent"
android:layout_height="match_parent"
class="com.google.android.gms.maps.SupportMapFragment" />
</FrameLayout>
<TextView
android:id="#+id/textView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:text="TextView" />
</LinearLayout>
Location Task:
public class LocationTask extends
AsyncTask<String, String, StringBuilder> {
private EditText address = null;
private EditText postalCode = null;
private EditText country = null;
private Context applicationContext;
private FragmentManager fragmentManager;
private LatLng coord;
public LocationTask(FragmentManager fmanager,
Context applicationContext) {
this.fragmentManager = fmanager;
this.applicationContext = applicationContext;
}
#Override
protected StringBuilder doInBackground(String... params) {
HttpGet httpGet = new HttpGet(params[0]);
HttpClient client = new DefaultHttpClient();
HttpResponse response;
try {
response = client.execute(httpGet);
StringBuilder stringBuilder = new StringBuilder();
try {
HttpEntity entity = response.getEntity();
InputStream stream = entity.getContent();
int b;
while ((b = stream.read()) != -1) {
stringBuilder.append((char) b);
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return stringBuilder;
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(StringBuilder result) {
JSONObject jsonObject = new JSONObject();
try {
jsonObject = new JSONObject(result.toString());
} catch (JSONException e) {
e.printStackTrace();
}
String postal_code = null;
String street_address = null;
String country = null;
try {
String status = jsonObject.getString("status").toString();
if (status.equalsIgnoreCase("OK")) {
JSONArray results = jsonObject.getJSONArray("results");
JSONObject r = results.getJSONObject(0);
JSONArray addressComponentsArray = r
.getJSONArray("address_components");
JSONObject geometry = r.getJSONObject("geometry");
JSONObject locationObj = geometry.getJSONObject("location");
coord = new LatLng(locationObj.getDouble("lat"), locationObj.getDouble("lng"));
}
} catch (JSONException e) {
e.printStackTrace();
}
GoogMapHandler gmh = new GoogMapHandler(fragmentManager, applicationContext);
gmh.initilizeMap(coord, "Username", "addressInfo");
}
}

I forgot to remove this in my ProfileActivity:
TextView textView = new TextView(this);
textView.setTextSize(40);
textView.setText(username);
setContentView(textView);
Removing it, solved my problem.

I cannot comment
Are you sure your code is going inside the IF block:
public void initilizeMap(LatLng coord, String username, String addrInfo) {
if (googleMap == null) {
//are you getting upto here?
....
}
}
If SupportMapFragment is declared in your layout, I don't think detach will do anything meaningful here. The following should work:
public void initilizeMap(LatLng coord, String username, String addrInfo) {
if (googleMap == null) {
Fragment fragment = this.fragmentManager.findFragmentById(R.id.map);
SupportMapFragment supportmapfragment = (SupportMapFragment) fragment;
googleMap = supportmapfragment.getMap();
if (googleMap == null) {
Toast.makeText(applicationContext,
"Sorry! Unable to create map.", Toast.LENGTH_SHORT)
.show();
} else {
Marker loc = googleMap.addMarker(new MarkerOptions()
.position(coord).title("User: " + username)
.snippet(addrInfo));
googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(coord, 15));
}
} else {
Marker loc = googleMap.addMarker(new MarkerOptions()
.position(coord).title("User: " + username)
.snippet(addrInfo));
googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(coord, 15));
}
If the above is not working, the problem is unlikely to be in the block of code, rather, it's probably getting called before map is ready.
Please give us more info; tell us whether the AsyncTask may be returning the results before onResume() is being called.

Related

AsyncTask and RecyclerView Don't Display the Contents Obtained from JSON on the Internet

I'm making a simple program where I can get a content from JSON in this url
https://www.haliminfo.com/feeds/posts/summary/?max-results=10&start-index=1&alt=json
and make it a list Using RecyclerView on Android.
I have made several necessary components such as Model, Adapter, Post Row Item and HttpHandler
when I try RecyclerView with a method like this it works.
private void addData () {
    postsArrayList = new ArrayList <> ();
    postsArrayList.add (new Posts ("TITLE", "SUMMARY"));
}
but when I apply the method below nothing appears in the activity
private class getContent extends AsyncTask <Void, Void, Void> {
        # Override
        protected Void doInBackground (Void ... voids) {
            HttpHandler sh = new HttpHandler ();
            // Making a request to url and getting response
            String jsonStr = sh.makeServiceCall (URL_FIX);
            if (jsonStr! = null) {
                try {
                    JSONObject jsonObj = new JSONObject (jsonStr);
                    JSONObject feed = jsonObj.getJSONObject ("feed");
                    JSONArray entry = feed.getJSONArray ("entry");
                    Posts postsModel = new Posts ();
                    for (int i = 0; i <entry.length (); i ++) {
                        postsModel.setTitle (entry.getJSONObject (i) .getJSONObject ("title"). getString ("$ t"));
                        postsModel.setSummary (entry.getJSONObject (i) .getJSONObject ("summary"). getString ("$ t"));
                        postsArrayList.add (postsModel);
                    }
                } catch (final JSONException e) {
                    Log.e ("RESPONSE", "Json parsing error:" + e.getMessage ());
                    runOnUiThread (new Runnable () {
                        # Override
                        public void run () {
                            Toast.makeText (getApplicationContext (),
                                    "Json parsing error:" + e.getMessage (),
                                    Toast.LENGTH_LONG)
                                    .show ();
                        }
                    });
                }
            } else {
                Log.e ("RESPONSE", "Couldn't get json from server.");
                runOnUiThread (new Runnable () {
                    # Override
                    public void run () {
                        Toast.makeText (getApplicationContext (),
                                "Couldn't get json from server. Check LogCat for possible errors!",
                                Toast.LENGTH_LONG)
                                .show ();
                    }
                });
            }
            return null;
        }
    }
this is a full file of some important files in my project
MainActivity.java
package com.badjing.bloggercoba.activities;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import com.badjing.bloggercoba.R;
import com.badjing.bloggercoba.adapter.PostRecyclerViewAdapter;
import com.badjing.bloggercoba.config.Config;
import com.badjing.bloggercoba.handler.HttpHandler;
import com.badjing.bloggercoba.model.Posts;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
private RecyclerView recyclerView;
private PostRecyclerViewAdapter postAdapter;
private ArrayList<Posts> postsArrayList;
private ProgressDialog pDialog;
private Config config = new Config();
String URL_FIX = Config.BLOG_URL + Config.BLOG_URL_MAX_RESULT + Config.MAX_RESULT + config.BLOG_URL_START_INDEX + config.START_INDEX + config.BLOG_URL_ALT_TYPE;;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
postsArrayList = new ArrayList<>();
new getContent().execute();
recyclerView = (RecyclerView) findViewById(R.id.post_recycle_view);
postAdapter = new PostRecyclerViewAdapter(postsArrayList);
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(MainActivity.this);
recyclerView.setLayoutManager(layoutManager);
recyclerView.setAdapter(postAdapter);
}
// private void addData() {
//
// postsArrayList = new ArrayList<>();
// postsArrayList.add(new Posts("JUDUL", "SUMMARY"));
//
// }
private class getContent extends AsyncTask<Void, Void, Void> {
// #Override
// protected void onPreExecute() {
// super.onPreExecute();
// // Showing progress dialog
// pDialog = new ProgressDialog(MainActivity.this);
// pDialog.setMessage("Please wait...");
// pDialog.setCancelable(false);
// pDialog.show();
// }
#Override
protected Void doInBackground(Void... voids) {
HttpHandler sh = new HttpHandler();
// Making a request to url and getting response
String jsonStr = sh.makeServiceCall(URL_FIX);
if (jsonStr != null) {
try{
JSONObject jsonObj = new JSONObject(jsonStr);
JSONObject feed = jsonObj.getJSONObject("feed");
JSONArray entry = feed.getJSONArray("entry");
Posts postsModel = new Posts();
for (int i = 0; i < entry.length(); i++) {
postsModel.setTitle(entry.getJSONObject(i).getJSONObject("title").getString("$t"));
postsModel.setSummary(entry.getJSONObject(i).getJSONObject("summary").getString("$t"));
postsArrayList.add(postsModel);
}
} catch (final JSONException e) {
Log.e("RESPONSE", "Json parsing error: " + e.getMessage());
runOnUiThread(new Runnable() {
#Override
public void run() {
Toast.makeText(getApplicationContext(),
"Json parsing error: " + e.getMessage(),
Toast.LENGTH_LONG)
.show();
}
});
}
} else {
Log.e("RESPONSE", "Couldn't get json from server.");
runOnUiThread(new Runnable() {
#Override
public void run() {
Toast.makeText(getApplicationContext(),
"Couldn't get json from server. Check LogCat for possible errors!",
Toast.LENGTH_LONG)
.show();
}
});
}
return null;
}
}
private void urlBuilder() {
URL_FIX = Config.BLOG_URL + Config.BLOG_URL_MAX_RESULT + 10 + config.BLOG_URL_START_INDEX + 1 + config.BLOG_URL_ALT_TYPE;
}
}
Post.java (post model)
package com.badjing.bloggercoba.model;
public class Posts {
String title;
String summary;
public Posts() {
}
public Posts(String title, String summary) {
this.title = title;
this.summary = summary;
}
public String getTitle() {
return title;
}
public String getSummary() {
return summary;
}
public void setTitle(String title) {
this.title = title;
}
public void setSummary(String summary) {
this.summary = summary;
}
}
PostRecyclerViewAdapter.java
package com.badjing.bloggercoba.adapter;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.badjing.bloggercoba.R;
import com.badjing.bloggercoba.model.Posts;
import java.util.ArrayList;
public class PostRecyclerViewAdapter extends RecyclerView.Adapter<PostRecyclerViewAdapter.MyViewHolder> {
private ArrayList<Posts> postsList;
public PostRecyclerViewAdapter(ArrayList<Posts> postsArrayList) {
this.postsList = postsArrayList;
}
#Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater layoutInflater = LayoutInflater.from(parent.getContext());
View view = layoutInflater.inflate(R.layout.post_row_item, parent, false);
return new MyViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull MyViewHolder holder, int position) {
holder.blog_post_title.setText(postsList.get(position).getTitle());
holder.blog_post_sumary.setText(postsList.get(position).getSummary());
}
#Override
public int getItemCount() {
return (postsList!= null) ? postsList.size() : 0;
}
public static class MyViewHolder extends RecyclerView.ViewHolder {
TextView blog_post_title, blog_post_sumary, blog_post_author;
ImageView img_thumbnail;
public MyViewHolder(View itemView) {
super(itemView);
blog_post_title = itemView.findViewById(R.id.blog_post_title);
blog_post_sumary = itemView.findViewById(R.id.blog_post_sumary);
// blog_post_author = itemView.findViewById(R.id.blog_post_author);
// img_thumbnail = itemView.findViewById(R.id.post_thumbnail);
}
}
}
post_row_item.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="250dp"
android:layout_marginTop="5dp"
android:padding="8dp"
android:background="#fff">
<ImageView
android:id="#+id/post_thumbnail"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#drawable/loading_shape"></ImageView>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="230dp"
android:orientation="vertical"
android:layout_margin="8dp" >
<TextView
android:id="#+id/blog_post_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="blog post title"
android:textSize="20dp"
android:textStyle="bold"/>
<TextView
android:id="#+id/blog_post_sumary"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="blog post summary"/>
<TextView
android:id="#+id/blog_post_author"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="~ author"/>
</LinearLayout>
</LinearLayout>
thank you for your attention and help.

How to fix an empty fragment?

I am new to Android development, trying to create my own app. It should display a particular YouTube Channel by using the YouTube Data API. I have started with the standard bottom navigation template in Android Studio and used the following project on Github for some start-up help. https://github.com/stressGC/Remake-YouTube-Android
I had to change a few things like the deprecated http call inside the code to keep it running with the new Android APKs. Everything seems fine from my point of view: I can see that the API content looks good and that each title / description / publishdate is placed in the according variables. There is also no error message in the log. When I start the emulator, the app is running fine. But as soon as I switch to the "Dashboard" fragment (where the code is placed), it is empty.
DashboardFragment.java
public class DashboardFragment extends Fragment {
private static String API_KEY = "hidden"; //normaler API key ohne limits, kein oauth
private static String CHANNEL_ID = "hidden";
private static String CHANNEL_GET_URL = "https://www.googleapis.com/youtube/v3/search?part=snippet&order=date&channelId="+CHANNEL_ID+"&maxResults=20&key="+API_KEY+"";
private RecyclerView mList_videos = null;
private VideoPostAdapter adapter = null;
private ArrayList<YouTubeDataModel> mListData = new ArrayList<>();
public DashboardFragment () {
}
#Override
public View onCreateView(#NonNull LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_dashboard, container, false);
mList_videos = (RecyclerView) view.findViewById(R.id.mList_videos);
initList(mListData);
new RequestYouTubeAPI().execute();
return view;
}
private void initList(ArrayList<YouTubeDataModel> mListData) {
mList_videos.setLayoutManager(new LinearLayoutManager(getActivity()));
adapter = new VideoPostAdapter(getActivity(), mListData);
mList_videos.setAdapter(adapter);
}
// create asynctask to get data from youtube
private class RequestYouTubeAPI extends AsyncTask<Void, String, String>{
#Override
protected void onPreExecute() {
super.onPreExecute();
}
#Override
protected String doInBackground(Void... params) {
URL url = null;
String json = null;
StringBuffer sb = new StringBuffer();
try {
url = new URL(CHANNEL_GET_URL);
} catch (MalformedURLException e) {
e.printStackTrace();
}
try {
//HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
HttpURLConnection urlConnection = NetCipher.getHttpsURLConnection(url);
InputStream in = new BufferedInputStream(urlConnection.getInputStream());
BufferedReader br = new BufferedReader(new InputStreamReader(in));
String inputLine = "";
while ((inputLine = br.readLine()) != null) {
sb.append(inputLine);
}
json = sb.toString();
return json;
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
#Override
protected void onPostExecute(String response) {
super.onPostExecute(response);
if(response != null){
try {
JSONObject jsonObject = new JSONObject(response);
Log.e("response", jsonObject.toString());
mListData = parseVideoListFromResponse(jsonObject);
initList(mListData);
//adapter.notifyDataSetChanged();
} catch (JSONException e) {
e.printStackTrace();
}
}
}
}
public ArrayList<YouTubeDataModel> parseVideoListFromResponse(JSONObject jsonObject) {
ArrayList<YouTubeDataModel> mList = new ArrayList<>();
if (jsonObject.has("items")) {
try {
JSONArray jsonArray = jsonObject.getJSONArray("items");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject json = jsonArray.getJSONObject(i);
if (json.has("id")) {
JSONObject jsonID = json.getJSONObject("id");
String video_id = "";
if (jsonID.has("videoId")) {
video_id = jsonID.getString("videoId");
}
if (jsonID.has("kind")) {
if (jsonID.getString("kind").equals("youtube#video")) {
YouTubeDataModel youtubeObject = new YouTubeDataModel();
JSONObject jsonSnippet = json.getJSONObject("snippet");
String title = jsonSnippet.getString("title");
String description = jsonSnippet.getString("description");
String publishedAt = jsonSnippet.getString("publishedAt");
String thumbnail = jsonSnippet.getJSONObject("thumbnails").getJSONObject("high").getString("url");
youtubeObject.setTitle(title);
youtubeObject.setDescription(description);
youtubeObject.setPublishedAt(publishedAt);
youtubeObject.setThumbnail(thumbnail);
youtubeObject.setVideo_id(video_id);
mList.add(youtubeObject);
}
}
}
}
} catch (JSONException e) {
e.printStackTrace();
}
}
return mList;
}
}
VideoPostAdapter.java
public class VideoPostAdapter extends RecyclerView.Adapter<VideoPostAdapter.YouTubePostHolder> {
private ArrayList<YouTubeDataModel> dataSet;
private Context mContext = null;
public VideoPostAdapter(Context mContext, ArrayList<YouTubeDataModel> dataSet) {
this.dataSet = dataSet;
this.mContext = mContext;
}
#NonNull
#Override
public YouTubePostHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.youtube_post_layout,parent,false);
YouTubePostHolder postHolder = new YouTubePostHolder(view);
return postHolder;
}
#Override
public void onBindViewHolder(#NonNull YouTubePostHolder holder, int position) {
// set the views here
TextView textViewTitle = holder.textViewTitle;
TextView textViewDes = holder.textViewDes;
TextView textViewDate = holder.textViewDate;
ImageView ImageThumb = holder.ImageThumb;
YouTubeDataModel object = dataSet.get(position);
textViewTitle.setText(object.getTitle());
textViewDes.setText(object.getDescription());
textViewDate.setText(object.getPublishedAt());
// image will be downloaded from url
}
#Override
public int getItemCount() {
return dataSet.size();
}
public static class YouTubePostHolder extends RecyclerView.ViewHolder{
TextView textViewTitle;
TextView textViewDes;
TextView textViewDate;
ImageView ImageThumb;
public YouTubePostHolder(#NonNull View itemView) {
super(itemView);
this.textViewTitle = (TextView) itemView.findViewById(R.id.textViewTitle);
this.textViewDes = (TextView) itemView.findViewById(R.id.textViewDes);
this.textViewDate = (TextView) itemView.findViewById(R.id.textViewDate);
this.ImageThumb = (ImageView) itemView.findViewById(R.id.ImageThumb);
}
}
}
YouTubeDataModel.java
public class YouTubeDataModel {
private String title = "";
private String description = "";
private String publishedAt = "";
private String thumbnail = "";
public String getVideo_id() {
return video_id;
}
public void setVideo_id(String video_id) {
this.video_id = video_id;
}
private String video_id = "";
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public String getPublishedAt() {
return publishedAt;
}
public void setPublishedAt(String publishedAt) {
this.publishedAt = publishedAt;
}
public String getThumbnail() {
return thumbnail;
}
public void setThumbnail(String thumbnail) {
this.thumbnail = thumbnail;
}
}
youtube_post_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="wrap_content">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="200dp">
<ImageView
android:id="#+id/ImageThumb"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/colorPrimary"/>
<TextView
android:id="#+id/textViewDate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="published at"
android:singleLine="true"
android:layout_alignParentRight="true"
android:layout_margin="5dp"
android:textColor="#android:color/white"
android:textSize="12dp"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_margin="10dp"
android:orientation="vertical">
<TextView
android:id="#+id/textViewTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="video Title"
android:singleLine="true"
android:textColor="#android:color/white"
android:textSize="22dp"/>
<TextView
android:id="#+id/textViewDes"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="video description"
android:singleLine="true"
android:textColor="#android:color/white"
android:textSize="12dp"/>
</LinearLayout>
</RelativeLayout>
</LinearLayout>
fragment_dashboard.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/mList_videos"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
Unfortunately I have no idea why the fragment is still empty. And without any error in Android Studio log I really hope you can help me :/

Inside your RequestYouTubeAPI ASyncTask you have this error code:
} catch (IOException e) {
e.printStackTrace();
return null;
}
Then in onPostExecute you have the following:
#Override
protected void onPostExecute(String response) {
super.onPostExecute(response);
if(response != null){
try {
JSONObject jsonObject = new JSONObject(response);
Log.e("response", jsonObject.toString());
mListData = parseVideoListFromResponse(jsonObject);
initList(mListData);
//adapter.notifyDataSetChanged();
} catch (JSONException e) {
e.printStackTrace();
}
}
}
Therefore if you get an error, you return null and if onPostExecute is given a null response it does nothing.
So this one place you could have an error and therefore a blank fragment.
Before you fix this, you can prove this is happening like so:
#Override
protected void onPostExecute(String response) {
super.onPostExecute(response);
if(response == null){
Log.e("TUT", "We did not get a response, not updating the UI.");
} else {
try {
JSONObject jsonObject = new JSONObject(response);
Log.e("response", jsonObject.toString());
mListData = parseVideoListFromResponse(jsonObject);
initList(mListData);
//adapter.notifyDataSetChanged();
} catch (JSONException e) {
e.printStackTrace();
}
}
}
You can fix this two ways:
in doInBackground change the catch to this:
} catch (IOException e) {
Log.e("TUT", "error", e);
// Change this JSON to match what the parse expects, so you can show an error on the UI
return "{\"yourJson\":\"error!\"}";
}
or onPostExecute:
if(response == null){
List errorList = new ArrayList();
// Change this data model to show an error case to the UI
errorList.add(new YouTubeDataModel("Error");
mListData = errorList;
initList(mListData);
} else {
try {
JSONObject jsonObject = new JSONObject(response);
Log.e("response", jsonObject.toString());
mListData = parseVideoListFromResponse(jsonObject);
initList(mListData);
//adapter.notifyDataSetChanged();
} catch (JSONException e) {
e.printStackTrace();
}
}
Hope that helps, there may be other errors in the code but this is one case that can happen if there is a problem with the API, the Json, the authorization, the internet etc.

Unable to parse json and set it to recyclerview [duplicate]

This question already has answers here:
What is a NullPointerException, and how do I fix it?
(12 answers)
Closed 6 years ago.
Hi I am learning Android App Development. For this, I wanted to make myself a simple wallpaper app. Hence, I wrote something roughly which is presented here. I want to get wallpaper urls from json. Unfortunately, I am unable to get data from my server. java.lang.NullPointerException: Attempt to read from null array
How do I get the data correctly from the jsonParse asynctask?
I am stuck on this the whole day. What could have gone wrong here?
Here is my code:
myjson.json:
{
"walls":[
{"ourUrl":"http://www.hdbloggers.net/wp-content/uploads/2016/01/Wallpapers-for-Android.jpg"},
{"ourUrl":"http://androidwallpape.rs/content/02-wallpapers/131-night-sky/wallpaper-2707591.jpg"},
{"ourUrl":"http://androidwallpape.rs/content/02-wallpapers/155-starrynight/starry-night-sky-star-galaxy-space-dark-9-wallpaper.jpg"}
]
}
MainActivity.java:
package regalstreak.me.wallpapers;
import android.app.Activity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
public class MainActivity extends Activity {
RecyclerView recyclerView;
RecyclerView.LayoutManager layoutManager;
RecyclerView.Adapter adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView = (RecyclerView)findViewById(R.id.recycler_view);
layoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
adapter = new RecyclerAdapter(this);
recyclerView.setAdapter(adapter);
}
}
RecyclerAdapter.java:
package regalstreak.me.wallpapers;
import android.content.Context;
import android.os.AsyncTask;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import org.apache.commons.io.IOUtils;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.util.ArrayList;
import java.util.List;
// This is a recycleradapter which will set the correct images to the correct position in the recyclerview.
public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.ViewHolder> {
private Context myCtx1;
String[] arr;
String[] arrurl;
String jsonURL = "http://dev.regalstreak.me/myjson.json";
public RecyclerAdapter(Context ctx) {
this.myCtx1 = ctx;
}
public ImageView Image;
private String[] mText = {
"Text 1",
"Text 2",
"Text 3"
};
public class ViewHolder extends RecyclerView.ViewHolder {
public TextView Text;
public ViewHolder(View itemView) {
super(itemView);
Image = (ImageView) itemView.findViewById(R.id.image_view);
Text = (TextView) itemView.findViewById(R.id.text_view);
}
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View v = LayoutInflater.from(viewGroup.getContext())
.inflate(R.layout.wallpapers_list, viewGroup, false);
ViewHolder viewHolder = new ViewHolder(v);
return viewHolder;
}
#Override
public void onBindViewHolder(ViewHolder viewHolder, int i) {
viewHolder.Text.setText(mText[i]);
new jsonParse().execute();
new DownloadImageTask(Image).execute(arrurl[i]);
}
#Override
public int getItemCount() {
return mText.length;
}
class jsonParse extends AsyncTask<String, Void, String[]> {
protected String[] doInBackground(String[] urls) {
String myText = null;
String url = urls[0];
String ourUrl;
try {
InputStream in = new java.net.URL(jsonURL).openStream();
myText = IOUtils.toString(in, "utf-8");
in.close();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
// Parse the json
List<String> allUrls = new ArrayList<String>();
JSONObject jsonObjectRoot = new JSONObject(myText);
JSONArray jsonArray = jsonObjectRoot.getJSONArray("walls");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObject = jsonArray.getJSONObject(i);
ourUrl = jsonObject.getString("ourUrl");
allUrls.add(ourUrl);
}
arr = allUrls.toArray(new String[allUrls.size()]);
} catch (JSONException e) {
e.printStackTrace();
}
return arr;
}
protected void onPostExecute(String[] result){
arrurl = result;
}
}
}
DownloadImageTask.java:
package regalstreak.me.wallpapers;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.util.Log;
import android.widget.ImageView;
import java.io.InputStream;
// Here, we will download the wallpapers obtained from jsonData with an asynctask.
public class DownloadImageTask extends AsyncTask<String, Void, Bitmap>{
ImageView bmImage;
public DownloadImageTask(ImageView bmImage){
this.bmImage = bmImage;
}
protected Bitmap doInBackground(String... urls) {
String urldisplay = urls[0];
Bitmap mIcon11 = null;
try {
InputStream in = new java.net.URL(urldisplay).openStream();
mIcon11 = BitmapFactory.decodeStream(in);
in.close();
} catch (Exception e) {
Log.e("Error getting images.", e.getMessage());
e.printStackTrace();
}
return mIcon11;
}
protected void onPostExecute(Bitmap result){
bmImage.setImageBitmap(result);
}
}
activity_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="regalstreak.me.wallpapers.MainActivity">
<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/recycler_view" />
</RelativeLayout>
wallpaper_list.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/relative"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="5dp">
<ImageView
android:id="#+id/image_view"
android:layout_width="match_parent"
android:layout_height="150dp" />
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignBottom="#id/image_view"
android:alpha="0.6"
android:background="#color/colorDivider"
android:padding="9dp">
<TextView
android:id="#+id/text_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textAlignment="center"
android:textColor="#color/colorPrimaryText" />
</RelativeLayout>
</RelativeLayout>

I have used HttpURLConnection class here for quick response and features like cache. The data received from the URL is being added to an input stream which we then convert to a String builder to get a string object which we can further use with the JSON classes.
PS - Add the AsyncTask code to your MainActivity itself, don't make a separate java file for this.
Tip - Always verify the json using this tool - jsonlint.com
MainActivity
/*
your code
*/
#Override
protected void onCreate(Bundle savedInstanceState) {
new MyAsyncTask().execute("");
}
class MyAsyncTask extends AsyncTask<String, String, Void> {
private ProgressDialog progressDialog = new ProgressDialog(StartScreen.this);
InputStream inputStream = null;
String result = "";
ArrayList<String> list;
protected void onPreExecute() {
progressDialog.setTitle("Downloading JSON Data");
progressDialog.show();
// above code makes a dialog with a progress bar
}
#Override
protected Void doInBackground(String... params) {
ArrayList<String> param = new ArrayList<String>();
URL url, url2;
try{
url = new URL("http://dev.regalstreak.me/myjson.json");
// link to your json file
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setUseCaches(false);
inputStream = new BufferedInputStream(urlConnection.getInputStream());
}catch (MalformedURLException malle){
Log.e("Mal", ""+malle);
malle.printStackTrace();
}catch (IOException ioe){
Log.e("IO", ""+ioe);
ioe.printStackTrace();
}
// Convert response to string using String Builder
try {
BufferedReader bReader = new BufferedReader(new InputStreamReader(inputStream, "utf-8"), 8);
StringBuilder sBuilder = new StringBuilder();
String line = null;
while ((line = bReader.readLine()) != null) {
sBuilder.append(line + "\n");
}
inputStream.close();
result = sBuilder.toString();
} catch (Exception e) {
Log.e("StringBuilding", "Error converting result " + e.toString());
}
return null;
}
protected void onPostExecute(Void v) {
//parse JSON data
try {
JSONObject jobj = new JSONObject(result);
//Taking a JSON Array from the JSONObject created above
String url = jobj.getString("ourUrl");
// We are adding this string to the ArrayList
list.add(url);
progressDialog.dismiss();
Context con = ListLoader.this.getApplication();
adapter = new RecyclerAdapter(list,con);
recyclerView.setAdapter(adapter);
} catch (JSONException e) {
Log.e("JSONException", "Error: " + e.toString());
} // catch (JSONException e)
}
}
/*
your code
*/
Now to display the images more effectively in the list, use the repo Universal image loader. It has a lot of features. You can get it here - https://github.com/nostra13/Android-Universal-Image-Loader
And then add this kind of code to display the images. Put it inside the onBindViewHolder
Adapter
#Override
public void onBindViewHolder(DataHolder holder, int position) {
ImageLoaderConfiguration config;
config = new ImageLoaderConfiguration.Builder(mContext).build();
ImageLoader.getInstance().init(config);
imageLoader = ImageLoader.getInstance();
DisplayImageOptions options = new DisplayImageOptions.Builder()
.showImageForEmptyUri(R.drawable.ic_error_black_48dp) // displays this image not found
.showImageOnFail(R.drawable.ic_error_black_48dp) // Displays this on failure
.showImageOnLoading(R.drawable.white) // Displays while loading
.cacheInMemory(false)
.cacheOnDisk(true)
.build();
imageLoader.displayImage(list.get(position), holder.imageView, options);
// We are feeding the urls here.
}

crashing app when use space in autocompletetextview

I am creating an app. my app is crash when i enter any word after provide space in autocompletetextview and then again when i enter any word then its crash. please help me. using following code.........
public class MainActivity extends AppCompatActivity implements OnMapReadyCallback,
GoogleApiClient.ConnectionCallbacks,GoogleApiClient.OnConnectionFailedListener,
LocationListener, AdapterView.OnItemClickListener {
private GoogleMap mMap;
GoogleApiClient mGoogleApiClient;
Location mLastLocation;
Marker mCurrLocationMarker,FindMarker;
LocationRequest mLocationRequest;
AutoCompleteTextView atvPlaces;
DownloadTask placesDownloadTask;
DownloadTask placeDetailsDownloadTask;
ParserTask placesParserTask;
ParserTask placeDetailsParserTask;
LatLng latLng;
final int PLACES = 0;
final int PLACES_DETAILS = 1;
ListView lv;
ImageButton remove;
private boolean exit = false;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
// setSupportActionBar(toolbar);
if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
checkLocationPermission();
}
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
onLocationChanged(mLastLocation);
}
});
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
remove = (ImageButton)findViewById(R.id.place_autocomplete_clear_button);
// Getting a reference to the AutoCompleteTextView
atvPlaces = (AutoCompleteTextView) findViewById(R.id.id_search_EditText);
atvPlaces.setThreshold(1);
// Adding textchange listener
atvPlaces.addTextChangedListener(new TextWatcher() {
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
// Creating a DownloadTask to download Google Places matching "s"
placesDownloadTask = new DownloadTask(PLACES);
// Getting url to the Google Places Autocomplete api
String url = getAutoCompleteUrl(s.toString().trim());
// Start downloading Google Places
// This causes to execute doInBackground() of DownloadTask class
placesDownloadTask.execute(url);
if (!atvPlaces.getText().toString().equals("")){
lv.setVisibility(View.VISIBLE);
remove.setVisibility(View.VISIBLE);
}else {
lv.setVisibility(View.GONE);
remove.setVisibility(View.GONE);
}
}
#Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
// TODO Auto-generated method stub
}
#Override
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
}
});
// Setting an item click listener for the AutoCompleteTextView dropdown list
/* atvPlaces.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> arg0, View arg1, int index,
long id) {
ListView lv = (ListView) arg0;
SimpleAdapter adapter = (SimpleAdapter) arg0.getAdapter();
HashMap<String, String> hm = (HashMap<String, String>) adapter.getItem(index);
// Creating a DownloadTask to download Places details of the selected place
placeDetailsDownloadTask = new DownloadTask(PLACES_DETAILS);
// Getting url to the Google Places details api
String url = getPlaceDetailsUrl(hm.get("reference"));
// Start downloading Google Place Details
// This causes to execute doInBackground() of DownloadTask class
placeDetailsDownloadTask.execute(url);
InputMethodManager inputManager = (InputMethodManager)
getSystemService(Context.INPUT_METHOD_SERVICE);
inputManager.hideSoftInputFromWindow(getCurrentFocus().getWindowToken(),
InputMethodManager.HIDE_NOT_ALWAYS);
}
});*/
lv=(ListView)findViewById(R.id.list);
lv.setOnItemClickListener(this);
setListenerOnWidget();
}
private void setListenerOnWidget() {
View.OnClickListener listener = new View.OnClickListener() {
#Override
public void onClick(View view) {
atvPlaces.setText("");
}
};
remove.setOnClickListener(listener);
}
#Override
public void onBackPressed() {
if(exit){
finish();
}else {
Toast.makeText(this, "Tap Back again to Exit.",
Toast.LENGTH_SHORT).show();
exit = true;
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
exit = false;
}
}, 3 * 1000);
}
}
#Override
public void onItemClick (AdapterView < ? > adapterView, View view,int i, long l){
//ListView lv = (ListView) adapterView;
SimpleAdapter adapter = (SimpleAdapter) adapterView.getAdapter();
HashMap<String, String> hm = (HashMap<String, String>) adapter.getItem(i);
// Creating a DownloadTask to download Places details of the selected place
placeDetailsDownloadTask = new DownloadTask(PLACES_DETAILS);
// Getting url to the Google Places details api
String url = getPlaceDetailsUrl(hm.get("reference"));
// Start downloading Google Place Details
// This causes to execute doInBackground() of DownloadTask class
placeDetailsDownloadTask.execute(url);
InputMethodManager inputManager = (InputMethodManager)
getSystemService(Context.INPUT_METHOD_SERVICE);
inputManager.hideSoftInputFromWindow(getCurrentFocus().getWindowToken(),
InputMethodManager.HIDE_NOT_ALWAYS);
String str = ((TextView) view.findViewById(R.id.place_name)).getText().toString();
Toast.makeText(this,str, Toast.LENGTH_SHORT).show();
atvPlaces.setText(str.replace(' ',','));
lv.setVisibility(view.GONE);
}
private String getPlaceDetailsUrl(String ref) {
// Obtain browser key from https://code.google.com/apis/console
String key = "key=**************************************";
// reference of place
String reference = "reference=" + ref;
// Sensor enabled
String sensor = "sensor=false";
// Building the parameters to the web service
String parameters = reference + "&" + sensor + "&" + key;
// Output format
String output = "json";
// Building the url to the web service
String url = "https://maps.googleapis.com/maps/api/place/details/" + output + "?" + parameters;
return url;
}
private String getAutoCompleteUrl(String place) {
// Obtain browser key from https://code.google.com/apis/console
String key = "key=*********************************";
// place to be be searched
String input = "input=" + place;
// place type to be searched
String types = "types=geocode";
// Sensor enabled
String sensor = "sensor=false";
// Building the parameters to the web service
String parameters = input + "&" + types + "&" + sensor + "&" + key;
// Output format
String output = "json";
// Building the url to the web service
String url = "https://maps.googleapis.com/maps/api/place/autocomplete/" + output + "?" + parameters;
return url;
}
/**
* A method to download json data from url
*/
private String downloadUrl(String strUrl) throws IOException {
String data = "";
InputStream iStream = null;
HttpURLConnection urlConnection = null;
try {
URL url = new URL(strUrl);
// Creating an http connection to communicate with url
urlConnection = (HttpURLConnection) url.openConnection();
// Connecting to url
urlConnection.connect();
// Reading data from url
iStream = urlConnection.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(iStream));
StringBuffer sb = new StringBuffer();
String line = "";
while ((line = br.readLine()) != null) {
sb.append(line);
}
data = sb.toString();
br.close();
} catch (Exception e) {
Log.d("Exception while downloading url", e.toString());
} finally {
iStream.close();
urlConnection.disconnect();
}
return data;
}
public static final int MY_PERMISSIONS_REQUEST_LOCATION = 99;
public boolean checkLocationPermission() {
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
if (ActivityCompat.shouldShowRequestPermissionRationale(this,
Manifest.permission.ACCESS_FINE_LOCATION)) {
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
MY_PERMISSIONS_REQUEST_LOCATION);
} else {
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
MY_PERMISSIONS_REQUEST_LOCATION);
}
return false;
} else {
return true;
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
#Override
public void onConnected(#Nullable Bundle bundle) {
mLocationRequest = new LocationRequest();
//mLocationRequest.setInterval(1000);
//mLocationRequest.setFastestInterval(1000);
mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
}
}
#Override
public void onConnectionSuspended(int i) {
}
#Override
public void onLocationChanged(Location location) {
mLastLocation = location;
if(mCurrLocationMarker != null){
mCurrLocationMarker.remove();
}
LatLng latLng = new LatLng(location.getLatitude(),location.getLongitude());
MarkerOptions markerOption = new MarkerOptions();
markerOption.position(latLng);
markerOption.title("Current Position");
markerOption.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA));
mCurrLocationMarker = mMap.addMarker(markerOption);
Toast.makeText(this,"Location changed",Toast.LENGTH_SHORT).show();
CameraPosition cameraPosition = new CameraPosition.Builder().target(latLng).zoom(13).build();
mMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));
if(mGoogleApiClient != null){
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient,this);
}
loadNearByPlaces(location.getLatitude(), location.getLongitude());
}
#Override
public void onConnectionFailed(#NonNull ConnectionResult connectionResult) {
}
#Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (ContextCompat.checkSelfPermission(this,
android.Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
buildGoogleApiClient();
mMap.setMyLocationEnabled(true);
}
} else {
buildGoogleApiClient();
mMap.setMyLocationEnabled(true);
}
}
protected synchronized void buildGoogleApiClient() {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
mGoogleApiClient.connect();
}
#Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResult) {
switch (requestCode) {
case MY_PERMISSIONS_REQUEST_LOCATION: {
if (grantResult.length > 0
&& grantResult[0] == PackageManager.PERMISSION_GRANTED) {
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
if (mGoogleApiClient == null) {
buildGoogleApiClient();
}
mMap.setMyLocationEnabled(true);
}
} else {
Toast.makeText(this, "permisison denied", Toast.LENGTH_LONG).show();
}
return;
}
}
}
private void loadNearByPlaces(double latitude, double longitude) {
//YOU Can change this type at your own will, e.g hospital, cafe, restaurant.... and see how it all works
String type = "atm";
StringBuilder googlePlacesUrl =
new StringBuilder("https://maps.googleapis.com/maps/api/place/nearbysearch/json?");
googlePlacesUrl.append("location=").append(latitude).append(",").append(longitude);
googlePlacesUrl.append("&radius=").append(PROXIMITY_RADIUS);
googlePlacesUrl.append("&types=").append(type);
googlePlacesUrl.append("&sensor=true");
googlePlacesUrl.append("&key=" + GOOGLE_BROWSER_API_KEY);
JsonObjectRequest request = new JsonObjectRequest(googlePlacesUrl.toString(),
new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject result) {
Log.i(TAG, "onResponse: Result= " + result.toString());
parseLocationResult(result);
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Log.e(TAG, "onErrorResponse: Error= " + error);
Log.e(TAG, "onErrorResponse: Error= " + error.getMessage());
}
});
AppController.getInstance().addToRequestQueue(request);
}
private void parseLocationResult(JSONObject result) {
String id, place_id, placeName = null, reference, icon, vicinity = null;
double latitude, longitude;
try {
JSONArray jsonArray = result.getJSONArray("results");
if (result.getString(STATUS).equalsIgnoreCase(OK)) {
//mMap.clear();
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject place = jsonArray.getJSONObject(i);
id = place.getString(ATM_ID);
place_id = place.getString(PLACE_ID);
if (!place.isNull(NAME)) {
placeName = place.getString(NAME);
}
if (!place.isNull(VICINITY)) {
vicinity = place.getString(VICINITY);
}
latitude = place.getJSONObject(GEOMETRY).getJSONObject(LOCATION)
.getDouble(LATITUDE);
longitude = place.getJSONObject(GEOMETRY).getJSONObject(LOCATION)
.getDouble(LONGITUDE);
reference = place.getString(REFERENCE);
icon = place.getString(ICON);
MarkerOptions markerOptions = new MarkerOptions();
LatLng latLng = new LatLng(latitude, longitude);
markerOptions.position(latLng);
markerOptions.title(placeName);
markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory .HUE_BLUE));
markerOptions.snippet(vicinity);
mMap.addMarker(markerOptions);
mMap.setInfoWindowAdapter(new GoogleMap.InfoWindowAdapter() {
#Override
public View getInfoWindow(Marker arg0) {
return null;
}
#Override
public View getInfoContents(Marker marker) {
View myContentsView = getLayoutInflater().inflate(R.layout.marker, null);
TextView tvTitle = ((TextView)myContentsView.findViewById(R.id.title));
tvTitle.setText(marker.getTitle());
TextView tvSnippet = ((TextView)myContentsView.findViewById(R.id.snippet));
tvSnippet.setText(marker.getSnippet());
return myContentsView;
}
});
}
Toast.makeText(getBaseContext(), jsonArray.length() + " ATM_FOUND!",
Toast.LENGTH_SHORT).show();
} else if (result.getString(STATUS).equalsIgnoreCase(ZERO_RESULTS)) {
Toast.makeText(getBaseContext(), "No ATM found in 5KM radius!!!",
Toast.LENGTH_LONG).show();
}
} catch (JSONException e) {
e.printStackTrace();
Log.e(TAG, "parseLocationResult: Error=" + e.getMessage());
}
}
private class DownloadTask extends AsyncTask<String, Void, String> {
private int downloadType = 0;
// Constructor
public DownloadTask(int type) {
this.downloadType = type;
}
#Override
protected String doInBackground(String... url) {
// For storing data from web service
String data = "";
try {
// Fetching the data from web service
data = downloadUrl(url[0]);
} catch (Exception e) {
Log.d("Background Task", e.toString());
}
return data;
}
#Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
switch (downloadType) {
case PLACES:
// Creating ParserTask for parsing Google Places
placesParserTask = new ParserTask(PLACES);
// Start parsing google places json data
// This causes to execute doInBackground() of ParserTask class
placesParserTask.execute(result);
break;
case PLACES_DETAILS:
// Creating ParserTask for parsing Google Places
placeDetailsParserTask = new ParserTask(PLACES_DETAILS);
// Starting Parsing the JSON string
// This causes to execute doInBackground() of ParserTask class
placeDetailsParserTask.execute(result);
}
}
}
/**
* A class to parse the Google Places in JSON format
*/
private class ParserTask extends AsyncTask<String, Integer, List<HashMap<String, String>>> {
int parserType = 0;
public ParserTask(int type) {
this.parserType = type;
}
#Override
protected List<HashMap<String, String>> doInBackground(String... jsonData) {
JSONObject jObject;
List<HashMap<String, String>> list = null;
try {
jObject = new JSONObject(jsonData[0]);
switch (parserType) {
case PLACES:
PlaceJSONParser placeJsonParser = new PlaceJSONParser();
// Getting the parsed data as a List construct
list = placeJsonParser.parse(jObject);
break;
case PLACES_DETAILS:
PlaceDetailsJSONParser placeDetailsJsonParser = new PlaceDetailsJSONParser();
// Getting the parsed data as a List construct
list = placeDetailsJsonParser.parse(jObject);
}
} catch (Exception e) {
Log.d("Exception", e.toString());
}
return list;
}
#Override
protected void onPostExecute(List<HashMap<String, String>> result) {
switch (parserType) {
case PLACES:
String[] from = new String[]{"description"};
int[] to = new int[]{R.id.place_name};
// Creating a SimpleAdapter for the AutoCompleteTextView
//SimpleAdapter adapter = new SimpleAdapter(getBaseContext(), result, android.R.layout.simple_list_item_1, from, to);
// Setting the adapter
//atvPlaces.setAdapter(adapter);
ListAdapter adapter = new SimpleAdapter(MainActivity.this, result,R.layout.row,from,to);
// Adding data into listview
lv.setAdapter(adapter);
break;
case PLACES_DETAILS:
String location = atvPlaces.getText().toString();
if (location != null && !location.equals("")) {
new GeocoderTask().execute(location);
}
break;
}
}
}
private class GeocoderTask extends AsyncTask<String, Void, List<Address>> {
#Override
protected List<Address> doInBackground(String... locationName) {
// TODO Auto-generated method stub
Geocoder geocoder = new Geocoder(getBaseContext());
List<Address> addresses = null;
try {
// Getting a maximum of 3 Address that matches the input text
addresses = geocoder.getFromLocationName(locationName[0], 3);
} catch (IOException e) {
e.printStackTrace();
}
return addresses;
}
protected void onPostExecute(List<Address> addresses) {
if(addresses==null || addresses.size()==0){
Toast.makeText(getBaseContext(), "No Location found", Toast.LENGTH_SHORT).show();
}
for(int i=0;i<addresses.size();i++){
Address address = (Address)addresses.get(i);
latLng = new LatLng(address.getLatitude(), address.getLongitude());
String addressText = String.format("%s, %s",
address.getMaxAddressLineIndex() > 0 ? address.getAddressLine(0) : "",
address.getCountryName());
MarkerOptions markerOptions = new MarkerOptions();
markerOptions.position(latLng);
markerOptions.title("Find Location");
markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED));
FindMarker = mMap.addMarker(markerOptions);
CameraPosition cameraPosition = new CameraPosition.Builder().target(latLng).zoom(13).build();
mMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));
loadNearByPlaces(address.getLatitude(), address.getLongitude());
}
}
}
}
my app is crash when i enter any word after provide space in autocompletetextview and then again when i enter any word then its crash....

Your list is initialized to null at
List<HashMap<String, String>> list = null;
And if the parsing fire any exception, the list will be still null since it won't get initialized & setting a null List to an adapter will produce the NullPointerException at getCount(). So just ensure to initialize it.
List<HashMap<String, String>> list = new ArrayList<>();
IMPORTANT
When you use a space & try to call that URL, it will fire a FileNotFoundException if not encoded properly. In your case, URL url = new URL(strUrl); is firing that exception while using space character.
Easiest way is to replace space with %20. In getAutoCompleteUrl() before return, put the following code to replace space with %20.
private String getAutoCompleteUrl(String place) {
-------existing code----
url = url.replaceAll(" ", "%20");
return url;
}

Actually i had faced the same situation. You are adding data to autocomplete textview dynamically , basically just like google for each word you are typing u are getting that data from server , if i am wrong please correct me.
Use this code for populating data into autocomplete textview dynamically from server depending upon your search
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import org.json.JSONArray;
import org.json.JSONException;
import org.ksoap2.SoapEnvelope;
import org.ksoap2.serialization.SoapObject;
import org.ksoap2.serialization.SoapSerializationEnvelope;
import org.ksoap2.transport.HttpTransportSE;
import android.app.Activity;
import android.content.Context;
import android.database.Cursor;
import android.database.MatrixCursor;
import android.os.AsyncTask;
import android.os.Bundle;
import android.provider.SyncStateContract.Columns;
import android.support.v4.widget.SimpleCursorAdapter;
import android.util.Log;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.Button;
import android.widget.Filter;
import android.widget.FilterQueryProvider;
import android.widget.ListView;
public class TestActivity extends Activity {
public Context mContext;
// views declaration
public AutoCompleteTextView txtAutoComplete;
public ListView lvItems;
// arrayList for Adaptor
ArrayList<String> listItems;
// getting input from AutocompleteTxt
String strItemName;
// making Adaptor for autocompleteTextView
ArrayAdapter<String> adaptorAutoComplete;
private static final int ADDRESS_TRESHOLD = 2;
private Filter filter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// for showing full screen
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_listitem);
mContext = this;
listItems = new ArrayList<String>();
// Declaring and getting all views objects
Button btnShare = (Button) findViewById(R.id.ListItem_btnShare);
Button btnSort = (Button) findViewById(R.id.ListItem_btnSort);
lvItems = (ListView) findViewById(R.id.ListItem_lvItem);
txtAutoComplete = (AutoCompleteTextView) findViewById(R.id.ListItem_autoComplete);
// adding listeners to button
btnShare.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
}
});
btnSort.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
}
});
String[] from = { "name" };
int[] to = { android.R.id.text1 };
SimpleCursorAdapter a = new SimpleCursorAdapter(this,
android.R.layout.simple_dropdown_item_1line, null, from, to, 0);
a.setStringConversionColumn(1);
FilterQueryProvider provider = new FilterQueryProvider() {
#Override
public Cursor runQuery(CharSequence constraint) {
// run in the background thread
if (constraint == null) {
return null;
}
String[] columnNames = { Columns._ID, "name" };
MatrixCursor c = new MatrixCursor(columnNames);
try {
// total code for implementing my way of auto complte
String SOAP_ACTION = "your action";
String NAMESPACE = "your name space";
String METHOD_NAME = "your method name";
String URL = "your Url";
SoapObject objSoap = null;
SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);
// Use this to add parameters
request.addProperty("KEY", yourkey);
request.addProperty("Key", constraint);
request.addProperty("Key", Id);
// Declare the version of the SOAP request
SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(
SoapEnvelope.VER11);
envelope.setOutputSoapObject(request);
envelope.dotNet = true;
HttpTransportSE androidHttpTransport = new HttpTransportSE(
URL);
// this is the actual part that will call the webservice
androidHttpTransport.call(SOAP_ACTION, envelope);
// Get the SoapResult from the envelope body.
objSoap = (SoapObject) envelope.getResponse();
if (objSoap != null) {
String strData = objSoap.toString();
}
if (objSoap != null) {
System.out.println("getPropertyCountinevents//////////"
+ objSoap.getPropertyCount());
for (int i = 0; i < objSoap.getPropertyCount(); i++) {
Object obj = objSoap.getProperty(i);
if (obj instanceof SoapObject) {
SoapObject objNew = (SoapObject) obj;
c.newRow()
.add(i)
.add(objNew.getProperty("Itemname")
.toString());
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
return c;
}
};
a.setFilterQueryProvider(provider);
txtAutoComplete.setAdapter(a);
} // on create ends
} // final class ends
replace mine code of getting data from server to yours i.e calling webservices through http calls and it will work like a charm.

Empty text view

I am currently developing an app in android studio.The goal of my app is to have one page(MainActivity.java & activityMain.xml) display a spinner. The items in this spinner are items from a remote database. When the user selects an item in this spinner I want that selected item to be displayed in a separate page(Map.java map.xml).
I used a putExtra method in MainActivity to store the selected item into a string variable:
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position,
long id) {
Toast.makeText(
getApplicationContext(),
parent.getItemAtPosition(position).toString() + " Selected" ,
Toast.LENGTH_LONG).show();
Intent intent = new Intent(MainActivity.this, Map.class);
String text = spinnerFood.getSelectedItem().toString();
intent.putExtra("SPINNER_KEY", text);
startActivity(intent);
}
Then in my Map class I am calling that string using getExtras:
String spinnerString;
if (savedInstanceState == null) {
Bundle extras = getIntent().getExtras();
if(extras == null) {
spinnerString= null;
} else {
spinnerString= extras.getString("STRING_I_NEED");
}
} else {
spinnerString= (String) savedInstanceState.getSerializable("STRING_I_NEED");
}
I can pass this string from MainActivity to Map successfully. My problem is when I try to display this string is does not appear on the XML page or on my phone when I run the app. I used the following code to try and display the string:
TextView e = (TextView)findViewById(R.id.textView);
e.setText(spinnerString);
Could someone please tell me where I am going wrong?
Here is my MainActivity class:
package com.example.cillin.infoandroidhivespinnermysql;
import java.util.ArrayList;
...
public class MainActivity extends Activity implements OnItemSelectedListener {
private Button btnAddNewCategory;
private TextView txtCategory;
public Spinner spinnerFood;
//public String spinnerValue;
// array list for spinner adapter
private ArrayList<Category> categoriesList;
ProgressDialog pDialog;
// API urls
// Url to create new category
private String URL_NEW_CATEGORY = "http://food_api/new_category.php";
// Url to get all categories
private String URL_CATEGORIES = "http://food_api/get_categories.php";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnAddNewCategory = (Button) findViewById(R.id.btnAddNewCategory);
spinnerFood = (Spinner) findViewById(R.id.spinFood);
txtCategory = (TextView) findViewById(R.id.txtCategory);
categoriesList = new ArrayList<Category>();
// spinner item select listener
spinnerFood.setOnItemSelectedListener(this);
// Add new category click event
btnAddNewCategory.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (txtCategory.getText().toString().trim().length() > 0) {
// new category name
String newCategory = txtCategory.getText().toString();
// Call Async task to create new category
new AddNewCategory().execute(newCategory);
} else {
Toast.makeText(getApplicationContext(),
"Please enter category name", Toast.LENGTH_SHORT)
.show();
}
}
});
new GetCategories().execute();
}
/**
* Adding spinner data
* */
public void populateSpinner() {
List<String> lables = new ArrayList<String>();
txtCategory.setText("");
for (int i = 0; i < categoriesList.size(); i++) {
lables.add(categoriesList.get(i).getName());
}
// Creating adapter for spinner
ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, lables);
// Drop down layout style - list view with radio button
spinnerAdapter
.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// attaching data adapter to spinner
spinnerFood.setAdapter(spinnerAdapter);
//String text = spinnerFood.getSelectedItem().toString();
}
/**
* Async task to get all food categories
* */
private class GetCategories extends AsyncTask<Void, Void, Void> {
#Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Fetching food categories..");
pDialog.setCancelable(false);
pDialog.show();
}
#Override
protected Void doInBackground(Void... arg0) {
ServiceHandler jsonParser = new ServiceHandler();
String json = jsonParser.makeServiceCall(URL_CATEGORIES, ServiceHandler.GET);
Log.e("Response: ", "> " + json);
if (json != null) {
try {
JSONObject jsonObj = new JSONObject(json);
if (jsonObj != null) {
JSONArray categories = jsonObj
.getJSONArray("categories");
for (int i = 0; i < categories.length(); i++) {
JSONObject catObj = (JSONObject) categories.get(i);
Category cat = new Category(catObj.getInt("id"),
catObj.getString("name"));
categoriesList.add(cat);
}
}
} catch (JSONException e) {
e.printStackTrace();
}
} else {
Log.e("JSON Data", "Didn't receive any data from server!");
}
return null;
}
#Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
if (pDialog.isShowing())
pDialog.dismiss();
populateSpinner();
}
}
/**
* Async task to create a new food category
* */
private class AddNewCategory extends AsyncTask<String, Void, Void> {
boolean isNewCategoryCreated = false;
#Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Creating new category..");
pDialog.setCancelable(false);
pDialog.show();
}
#Override
protected Void doInBackground(String... arg) {
String newCategory = arg[0];
// Preparing post params
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("name", newCategory));
ServiceHandler serviceClient = new ServiceHandler();
String json = serviceClient.makeServiceCall(URL_NEW_CATEGORY,
ServiceHandler.POST, params);
Log.d("Create Response: ", "> " + json);
if (json != null) {
try {
JSONObject jsonObj = new JSONObject(json);
boolean error = jsonObj.getBoolean("error");
// checking for error node in json
if (!error) {
// new category created successfully
isNewCategoryCreated = true;
} else {
Log.e("Create Category Error: ", "> " + jsonObj.getString("message"));
}
} catch (JSONException e) {
e.printStackTrace();
}
} else {
Log.e("JSON Data", "Didn't receive any data from server!");
}
return null;
}
#Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
if (pDialog.isShowing())
pDialog.dismiss();
if (isNewCategoryCreated) {
runOnUiThread(new Runnable() {
#Override
public void run() {
// fetching all categories
new GetCategories().execute();
}
});
}
}
}
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position,
long id) {
Toast.makeText(
getApplicationContext(),
parent.getItemAtPosition(position).toString() + " Selected" ,
Toast.LENGTH_LONG).show();
Intent intent = new Intent(MainActivity.this, Map.class);
String text = spinnerFood.getSelectedItem().toString();
intent.putExtra("SPINNER_KEY", text);
startActivity(intent);
}
#Override
public void onNothingSelected(AdapterView<?> arg0) {
}
}
Here is Map.java:
package com.example.cillin.infoandroidhivespinnermysql;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Spinner;
import android.widget.TextView;
/**
* Created by cillin on 06/07/2015.
*/
public class Map extends Activity
{
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
//This page layout is located in the menu XML file
//SetContentView links a Java file, to its XML file for the layout
setContentView(R.layout.map);
/*Spinner mySpinner = (Spinner)findViewById(R.id.spinFood);
String text = mySpinner.getSelectedItem().toString();
EditText e = (EditText) findViewById (R.id.editText1);
e.setText(text);*/
String spinnerString;
if (savedInstanceState == null) {
Bundle extras = getIntent().getExtras();
if(extras == null) {
spinnerString= null;
} else {
spinnerString= extras.getString("STRING_I_NEED");
}
} else {
spinnerString= (String) savedInstanceState.getSerializable("STRING_I_NEED");
}
/*if (getIntent() != null && getIntent().getExtras() != null) {
Bundle bundle = getIntent().getExtras();
if (bundle.getString("SPINNER_KEY") != null) {
spinnerString = bundle.getString("SPINNER_KEY");
}
}*/
//String a = "ddd";
TextView e = (TextView)findViewById(R.id.textView);
e.setText(spinnerString);
Button mainm = (Button)findViewById(R.id.mainmenu);
mainm.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//This button is linked to the map page
Intent i = new Intent(Map.this, MainMenu.class);
//Activating the intent
startActivity(i);
}
});
}
}
Here is my map.xml file:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:layout_width="300dp"
android:layout_height="300dp"
android:id="#+id/imageView"
android:adjustViewBounds="true"
android:scaleType="fitCenter"
android:src="#drawable/map_image"
android:contentDescription="#string/map"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="46dp" />
<Button
android:id="#+id/mainmenu"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="140dp"
android:layout_marginTop = "450dp"
android:text="Main Menu" />
<TextView
android:layout_width="200dp"
android:layout_height="20dp"
android:id="#+id/textView"
android:layout_below="#+id/imageView"
android:layout_alignRight="#+id/imageView"
android:layout_alignEnd="#+id/imageView" />
</RelativeLayout>

you have to use getIntent().getStringExtra("STRING_I_NEED");
getIntent.getExtras() will work only if you pass Bundle in calling activity

I fixed it:
String spinnerString;
if (savedInstanceState == null) {
Bundle extras = getIntent().getExtras();
if(extras == null) {
spinnerString= null;
} else {
spinnerString= extras.getString("STRING_I_NEED");
}
} else {
spinnerString= (String) savedInstanceState.getSerializable("STRING_I_NEED");
}
I changed "STRING_I_NEED" to "SPINNER_KEY"

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Redraw Fragment in View after initialising Google Map - Android - java

I forgot to remove this in my ProfileActivity: TextView textView = new TextView(this); textView.setTextSize(40); textView.setText(username); setContentView(textView); Removing it, solved my problem.

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