We Keep Coding

caused by: Can't toast on a thread that has not called Looper.prepare()

So whenever I Enter a city name in the EditText and press the button my app just crashes and does not show a toast
shows this error in logcat : used by: java.lang.NullPointerException: Can't toast on a thread that has not called Looper.prepare()
Does anyone know who to fix this error?
im using android studio
package com.example.whatstheweather;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Context;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Looper;
import android.util.Log;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import org.json.JSONArray;
import org.json.JSONObject;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
public class MainActivity extends AppCompatActivity {
EditText editText;
TextView resultTextView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
editText = findViewById(R.id.editTextTextPersonName);
resultTextView = findViewById(R.id.resultTextView);
}
public void getWeather(View view){
try {
DownloadTask task = new DownloadTask();
String encodedCityName = URLEncoder.encode(editText.getText().toString(), "UTF-8");
task.execute("http://openweathermap.org/data/2.5/weather?q=" + encodedCityName + "&APPID=9eebb30a9664baf113136d98e764ffb5");
InputMethodManager mgr = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
mgr.hideSoftInputFromWindow(editText.getWindowToken(), 0);
}catch (Exception e){
e.printStackTrace();
Toast.makeText(getApplicationContext(),"Could not find weather :(",Toast.LENGTH_SHORT).show();
}
}
public class DownloadTask extends AsyncTask<String, Void, String >{
#Override
protected String doInBackground(String... urls) {
String result = "";
URL url;
HttpURLConnection urlConnection = null;
try {
url = new URL(urls[0]);
urlConnection = (HttpURLConnection) url.openConnection();
InputStream in = urlConnection.getInputStream();
InputStreamReader reader = new InputStreamReader(in);
int data = reader.read();
while(data != -1){
char current = (char) data;
result += current;
data = reader.read();
}
return result;
}catch(Exception e){
e.printStackTrace();;
Toast.makeText(getApplicationContext(),"Could not find weather :(",Toast.LENGTH_SHORT).show();
return null;
}
}
#Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
try {
JSONObject jsonObject = new JSONObject(s);
String weatherInfo = jsonObject.getString("weather");
JSONArray arr = new JSONArray(weatherInfo);
String message = "";
for (int i = 0; i< arr.length(); i++){
JSONObject jsonPart =arr.getJSONObject(i);
String main = jsonPart.getString("main");
String description = jsonPart.getString("description");
if (!main.equals("") && !description.equals("")) {
message += main + ": " + description + "\r\n";
}
}
if (!message.equals("")){
resultTextView.setText(message);
}else{
Toast.makeText(getApplicationContext(),"Could not find weather :(",Toast.LENGTH_SHORT).show();
}
}catch (Exception e){
e.printStackTrace();
Toast.makeText(getApplicationContext(),"Could not find weather :(",Toast.LENGTH_SHORT).show();
}
}
}
}

try {
//add her code
} catch (java.text.ParseException e) {
runOnUiThread(new Runnable(){
public void run() {
Toast.makeText(getApplicationContext(),"Please key in
the correct input",
Toast.LENGTH_LONG).show();
}
});
e.printStackTrace();
return true; // attention here
}

Method in onCreate :
private void toastPublic(final String message){
Handler handler = new Handler(Looper.getMainLooper());
handler.post(new Runnable() {
public void run() {
Toast.makeText(getBaseContext(),""+message,
4 /*Toast.LENGTH_SHORT*/).show();
}});
}
Next : use in inside asyncTask or Thread

How do I ensure that my list view element do not disappear when I change the orientation of my device?

I am building an app that displays details of a book you have searched. The problem is that every time I change the orientation of my device the list view elements disappear. I want help in how to make them not disappear. I have a feeling that I need to use a Loader but I have no idea in how to implement it. Here are my activities.
MainActivity :-
package com.example.visha.booklistingapp;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private BookAdapter mAdapter;
EditText searchtext;
ListView earthquakeListView;
TextView empty;
TextView authorcheck;
TextView titlecheck;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
earthquakeListView = (ListView) findViewById(R.id.listView);
mAdapter = new BookAdapter(this, new ArrayList<Book>());
earthquakeListView.setAdapter(mAdapter);
searchtext = (EditText) findViewById(R.id.editText);
empty = (TextView) findViewById(R.id.textView);
earthquakeListView.setEmptyView(empty);
}
public void searchclick(View view) {
ConnectivityManager connectivityManager = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
if(connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState() == NetworkInfo.State.CONNECTED ||
connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState() == NetworkInfo.State.CONNECTED) {
String parturl = searchtext.getText().toString();
parturl = parturl.replaceAll("\\s","");
StringBuilder urlbuilder = new StringBuilder();
urlbuilder.append(" https://www.googleapis.com/books/v1/volumes?q=");
urlbuilder.append(parturl);
urlbuilder.append("&maxResults=5");
String url = urlbuilder.toString();
BookAsyncTask task = new BookAsyncTask();
task.execute(url); }
else{
Toast.makeText(getApplicationContext(), "You are not connected to the internet",
Toast.LENGTH_LONG).show();
}
}
private class BookAsyncTask extends AsyncTask<String, Void, List<Book>> {
#Override
protected List<Book> doInBackground(String... urls) {
// Don't perform the request if there are no URLs, or the first URL is null
if (urls.length < 1 || urls[0] == null) {
return null;
}
List<Book> result = QueryUtils.fetchBookData(urls[0]);
return result;
}
#Override
protected void onPostExecute(List<Book> data) {
mAdapter.clear();
if (data != null && !data.isEmpty()) {
mAdapter.addAll(data);
}
}
}
}
QueryUtils :-
package com.example.visha.booklistingapp;
import android.text.TextUtils;
import android.util.Log;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;
/**
* Created by visha on 14-10-2016.
*/
public final class QueryUtils {
private static final String LOG_TAG = QueryUtils.class.getSimpleName();
private QueryUtils() {
}
public static List<Book> fetchBookData(String requestUrl) {
URL url = createUrl(requestUrl);
String jsonResponse = null;
try {
jsonResponse = makeHttpRequest(url);
} catch (IOException e) {
Log.e(LOG_TAG, "Problem making the HTTP request.", e);
}
List<Book> Books = extractFeatureFromJson(jsonResponse);
return Books;
}
private static URL createUrl(String stringUrl) {
URL url = null;
try {
url = new URL(stringUrl);
} catch (MalformedURLException e) {
Log.e(LOG_TAG, "Problem building the URL ", e);
}
return url;
}
private static String makeHttpRequest(URL url) throws IOException {
String jsonResponse = "";
if (url == null) {
return jsonResponse;
}
HttpURLConnection urlConnection = null;
InputStream inputStream = null;
try {
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setReadTimeout(10000 /* milliseconds */);
urlConnection.setConnectTimeout(15000 /* milliseconds */);
urlConnection.setRequestMethod("GET");
urlConnection.connect();
if (urlConnection.getResponseCode() == 200) {
inputStream = urlConnection.getInputStream();
jsonResponse = readFromStream(inputStream);
} else {
Log.e(LOG_TAG, "Error response code: " + urlConnection.getResponseCode());
}
} catch (IOException e) {
Log.e(LOG_TAG, "Problem retrieving the Book JSON results.", e);
} finally {
if (urlConnection != null) {
urlConnection.disconnect();
}
if (inputStream != null) {
inputStream.close();
}
}
return jsonResponse;
}
private static String readFromStream(InputStream inputStream) throws IOException {
StringBuilder output = new StringBuilder();
if (inputStream != null) {
InputStreamReader inputStreamReader = new InputStreamReader(inputStream, Charset.forName("UTF-8"));
BufferedReader reader = new BufferedReader(inputStreamReader);
String line = reader.readLine();
while (line != null) {
output.append(line);
line = reader.readLine();
}
}
return output.toString();
}
private static List<Book> extractFeatureFromJson(String BookJSON) {
if (TextUtils.isEmpty(BookJSON)) {
return null;
}
List<Book> Books = new ArrayList<>();
try {
JSONObject baseJsonResponse = new JSONObject(BookJSON);
JSONArray BookArray = baseJsonResponse.getJSONArray("items");
for (int i = 0; i < BookArray.length(); i++) {
JSONObject currentBook = BookArray.getJSONObject(i);
JSONObject properties = currentBook.getJSONObject("volumeInfo");
String author;
if(properties.has("authors")) {
author = properties.getString("authors");
}
else {
author = "";
}
String title = properties.getString("title");
Book Book = new Book(author, title);
Books.add(Book);
}
} catch (JSONException e) {
Log.e("QueryUtils", "Problem parsing the Book JSON results", e);
}
return Books;
}
}

You need to override onSaveInstanceState and onRestoreInstanceState methods of Activity Class.
In onSaveInstanceState, save the list data into the Bundle.
In onRestoreInstanceState, restore the list with the Bundle data and re-create the list adapter.
Cheers!!!

if you do not have a different layout for the activity landscape mode then simply putting android:configChanges="orientation|screenLayout|screenSize" will do the job for you.
Example:
<activity
android:name=".MainActivity"
android:configChanges="orientation|screenLayout|screenSize" />
and if you do have different layout for landscape mode the you need to override the savedInstanceState and save and restore the list accordingly in OnCreate

Android File Download from File system web server not working

The list is working fine but the problem is i can't download the file from the web server file system. When i tried clicking one of the list item, the dialog will show up but after a few seconds the app will crash. I am using GenyMotion emulator
The filename is correct and also the url, i guess it's in the saving part
Memo.java
package com.example.androidtablayout;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.ListActivity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;
public class Memo extends ListActivity {
// Declare Variables
JSONObject jsonobject;
JSONArray jsonarray;
ListView listview;
ArrayList<HashMap<String, String>> arraylist;
ProgressDialog mProgressDialog, dialog;
JSONParser jsonParser = new JSONParser();
String email;
SessionManager session;
String[] services;
private String url = "http://10.0.3.2/sunshine-ems/memo.php";
// single product url
// ALL JSON node names
private static final String MEMO_ID = "memo_id";
private static final String MEMO_SENDER = "sender";
private static final String MEMO_FILENAME = "file_name";
Button btnLogout;
String username;
String download_path = "";
String dest_file_path = "";
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.announc);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
session = new SessionManager(getApplicationContext());
username = session.getUsername();
btnLogout = (Button) findViewById(R.id.btnLogout);
btnLogout.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
// Launching All products Activity
session.logoutUser();
Intent i = new Intent(getApplicationContext(), Login.class);
startActivity(i);
}
});
new DownloadJSON().execute();
ListView lv = getListView();
lv.setOnItemClickListener(new android.widget.AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> arg0, View view, int arg2, long arg3) {
String memo_filename = ((TextView) view.findViewById(R.id.txt_service)).getText().toString();
download_path = "http://www.sunshine-ems.balay-indang.com/attachments/memo/"+memo_filename+".docx";
String sd_path = Environment.getExternalStorageDirectory().getPath();
dest_file_path = sd_path+"/"+memo_filename+".docx";
dialog = ProgressDialog.show(Memo.this, "", "Downloading file...", true);
new Thread(new Runnable() {
public void run() {
//Log.d("Download Path", dest_file_path+" "+download_path);
downloadFile(download_path, dest_file_path);
}
}).start();
}
});
}
//download
public void downloadFile(String download_path, String dest_file_path) {
try {
File dest_file = new File(dest_file_path);
URL u = new URL(download_path);
URLConnection conn = u.openConnection();
int contentLength = conn.getContentLength();
DataInputStream stream = new DataInputStream(u.openStream());
byte[] buffer = new byte[contentLength];
stream.readFully(buffer);
stream.close();
DataOutputStream fos = new DataOutputStream(new FileOutputStream(dest_file));
fos.write(buffer);
fos.flush();
fos.close();
hideProgressIndicator();
} catch(FileNotFoundException e) {
hideProgressIndicator();
return;
} catch (IOException e) {
hideProgressIndicator();
return;
}
}
void hideProgressIndicator(){
runOnUiThread(new Runnable() {
public void run() {
dialog.dismiss();
}
});
}
// DownloadJSON AsyncTask
private class DownloadJSON extends AsyncTask<String, String, String> {
#Override
protected void onPreExecute() {
super.onPreExecute();
mProgressDialog = new ProgressDialog(Memo.this);
mProgressDialog.setTitle("Loading Services");
mProgressDialog.setMessage("Loading...");
mProgressDialog.setIndeterminate(false);
mProgressDialog.show();
}
#Override
protected String doInBackground(String... params) {
username = session.getUsername();
List<NameValuePair> params1 = new ArrayList<NameValuePair>();
params1.add(new BasicNameValuePair("username", username));
JSONObject json = jsonParser.makeHttpRequest(url, "POST", params1);
// Check your log cat for JSON reponse
Log.d("Check JSON ", json.toString());
// Create the array
arraylist = new ArrayList<HashMap<String, String>>();
try {
int success = json.getInt("success");
if (success == 1) {
// Locate the array name
jsonarray = json.getJSONArray("memos");
for (int i = 0; i < jsonarray.length(); i++) {
json = jsonarray.getJSONObject(i);
String m_id = json.optString(MEMO_ID);
String m_subject = json.getString(MEMO_FILENAME);
String m_sender = json.getString(MEMO_SENDER);
// Retrive JSON Objects
HashMap<String, String> map = new HashMap<String, String>();
map.put(MEMO_ID, m_id);
map.put(MEMO_FILENAME, m_subject);
map.put(MEMO_SENDER, m_sender);
// Set the JSON Objects into the array
arraylist.add(map);
}
}
} catch (JSONException e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(String file_url) {
mProgressDialog.dismiss();
// updating UI from Background Thread
runOnUiThread(new Runnable() {
public void run() {
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(
Memo.this,
arraylist,
R.layout.listview_services,
new String[] { MEMO_ID, MEMO_FILENAME, MEMO_SENDER },
new int[] { R.id.transac_id, R.id.txt_service,
R.id.txt_date });
// updating listview
setListAdapter(adapter);
}
});
}
}
}
I think the downloading was fine, maybe the problem is in the saving/writing part. Maybe the destination path or something close to that
And also where can i see the downloaded file after the download?
I'm using GenyMotion emulator
I'm sorry for the noob questions
Thank you so much

The problem seems to be this line (because it is the only array):
byte[] buffer = new byte[contentLength];
Looking at the declaration of contentLenght it seems conn.getContentLength() is returning a negative number.
Returns the content length in bytes specified by the response header field
content-length or -1 if this field is not set or cannot be represented as an int.
I copied your code and checked with a debugger: contentLenght is always -1.
I just rewrote your downloadFile function to use HttpURLConnection instead of URLConnection. Additionally, it uses a small buffer multiple times instead of creating one large buffer.
//download
public void downloadFile(String download_path, String dest_file_path) {
try {
URL u = new URL(download_path);
HttpURLConnection conn = (HttpURLConnection) u.openConnection();
InputStream stream = conn.getInputStream();
File f = new File(dest_file_path);
FileOutputStream fos = new FileOutputStream(f);
int bytesRead = 0;
byte[] buffer = new byte[4096];
while ((bytesRead = stream.read(buffer)) != -1) {
fos.write(buffer, 0, bytesRead);
}
fos.close();
stream.close();
hideProgressIndicator();
} catch(FileNotFoundException e) {
hideProgressIndicator();
return;
} catch (IOException e) {
hideProgressIndicator();
return;
}
}
You can view the file afterwards by using ADB. Android device monitor contains a file explorer and is located at "path-to\AndroidSDK\tools\monitor.bat" (using Windows)

how can a create a thread for a connection json call for android

i am geting this error java.lang.NullPointerException in line 97
i think is for, de json call, because is not getting the data,
how i can create a thread, for get this data first then do the next step.
iam really new in this so any help well be apreciate.
package com.zoada;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.Window;
import android.view.WindowManager;
import android.widget.TableLayout;
import android.widget.TableRow;
import android.widget.TextView;
public class MainActivity extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// esconde el titlebar de la aplicaci�n
// tiene que estar antes de colocar el mainLayout
requestWindowFeature(Window.FEATURE_NO_TITLE);
// esconde el statusbar de Android
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_main);
JSONArray posiciones = null;
// *** Comienza la comunicaci�n con el servidor
BufferedReader in = null;
try {
HttpClient client = new DefaultHttpClient();
HttpGet request = new HttpGet("http://zoada.com/blah.php");
HttpResponse response = client.execute(request);
// leyendo "response" un string gigantesco
in = new BufferedReader(
new InputStreamReader(
response.getEntity().getContent()));
// imprimpiendo el tarugo de texto linea a linea
StringBuffer sb = new StringBuffer("");
String line = "";
String NL = System.getProperty("line.separator");
while ((line = in.readLine()) != null) {
sb.append(line + NL);
}
in.close();
String page = sb.toString();
//System.out.println(page);
//aqui viene la parte JSON!!!
JSONObject jObject = new JSONObject(page);
posiciones = jObject.getJSONArray("positions");
for (int i=0; i< posiciones.length(); i++) {
JSONObject jo = posiciones.getJSONObject(i);
//System.out.println(jo.getString("name"));
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
if (in != null) {
try {
in.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
// *** termina comunicaci�n con el servidor
TableLayout tl = (TableLayout)findViewById(R.id.containerTable);
LayoutInflater inflater = getLayoutInflater();
for (int i = 0; i < posiciones.length(); i++) {
try {
JSONObject jo = posiciones.getJSONObject(i);
TableRow row = (TableRow)inflater.inflate(R.layout.tablerow, tl, false);
TextView pos = (TextView)row.findViewById(R.id.position);
String posTxt=jo.getString("position");
pos.setText(posTxt);
TextView team = (TextView)row.findViewById(R.id.team);
String teamTxt=jo.getString("name");
team.setText(teamTxt);
TextView points = (TextView)row.findViewById(R.id.points);
String pointsTxt=jo.getString("points");
points.setText(pointsTxt);
TextView games = (TextView)row.findViewById(R.id.games);
String gamesTxt=jo.getString("played");
games.setText(gamesTxt);
TextView victories = (TextView)row.findViewById(R.id.victories);
String victoriesTxt=jo.getString("won");
victories.setText(victoriesTxt);
TextView draw = (TextView)row.findViewById(R.id.draw);
String drawsTxt=jo.getString("draw");
draw.setText(drawsTxt);
TextView lost = (TextView)row.findViewById(R.id.loss);
String loseTxt=jo.getString("lost");
lost.setText(loseTxt);
TextView goals = (TextView)row.findViewById(R.id.goals);
int goalsInt = Integer.parseInt(jo.getString("gol"));
int againstInt = Integer.parseInt(jo.getString("against"));
String goalsTxt=goalsInt+":"+againstInt;
goals.setText(goalsTxt);
TextView diff = (TextView)row.findViewById(R.id.difference);
int diffInt=goalsInt-againstInt;
String diffTxt=""+diffInt;
diff.setText(diffTxt);
/**/
tl.addView(row);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
// text = (EditText) findViewById(R.id.EditText01);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}

You shouldn't perform network operations in UI thread!
For instance you can create AsyncTask in your class.
It may looks similar to this
private class ParseTask extends AsyncTask<Params, Progress, Result> {
#Override
protected Result doInBackground(Params params) {
// get url
Params url = params[0];
// create HttpClient etc.
...
// get response, and parse json
// return
return result;
}
#Override
protected void onPostExecute (Result result) {
// now when you have result from parsed json,
// update application UI or whatever you need
someEditText.setText(value_from_result);
}
}
After that, simply call in onCreate method
ParseTask task = new ParseTask();
task.execute(url);
to start AsyncTask.
On the other hand, it's possible to get the same effect by processing json in IntentService, or service in general, and parsed json return to Activity through broadcast.

Pass values of array inbetween classes

I am using a spinner when selected starts an intent and the class that is started gets and XML feed and displays it.
I am trying to call a different XML file based on what is selected by the user. I am not sure how the value can be passed to my XMLfunctions.java and once selected can the other classes reference that data?
HERE is my Eclipse Package Download
My thourghts were to have a multidimensional array with the titles for the spinner and the coinsiding XML url:
package com.patriotsar;
import android.app.Activity;
import android.content.Intent;
import android.content.ActivityNotFoundException;
import android.content.Context;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;
import android.widget.Toast;
public class patriosar extends Activity {
private Button goButton;
private String array_spinner[];
String url = "http://www.patriotsar.com";
Intent i = new Intent(Intent.ACTION_VIEW);
Uri u = Uri.parse(url);
Context context = this;
Spinner areaspinner;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
array_spinner=new String[4];
array_spinner[0]="George Washington","gw.xml";
array_spinner[1]="BENJAMIN FRANKLIN","bf.xml";
array_spinner[2]="THOMAS JEFFERSON","tj.xml";
array_spinner[3]="PATRICK HENRY","ph.xml";
goButton = (Button)findViewById(R.id.goButton);
areaspinner = (Spinner) findViewById(R.id.areaspinner);
ArrayAdapter<String> adapter =
new ArrayAdapter<String> (this,
android.R.layout.simple_spinner_item,array_spinner);
areaspinner.setAdapter(adapter);
goButton.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v){
try {
// Start the activity
i.setData(u);
startActivity(i);
} catch (ActivityNotFoundException e) {
// Raise on activity not found
Toast.makeText(context, "Browser not found.", Toast.LENGTH_SHORT);
}
}
});
areaspinner.setOnItemSelectedListener(new OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
int item = areaspinner.getSelectedItemPosition();
if(item != 0){
Intent myIntent = new Intent(patriosar.this, ShowXMLPAR.class);
startActivityForResult(myIntent, 0);
}
else {
// finish();
}
}
public void onNothingSelected(AdapterView<?> arg0) {
}
});
}
}
I then have a listener that calls an intent ShowXMLPAR.class when an item other then default is selected. The ShowXMLPAR class calls a function from XMLfunctions.java class and then shows the data that is returned. So the second value in the selected array item needs to be passed to to both pages I guess.
ShowXMLPAR.java:
package com.patriotsar;
import java.util.ArrayList;
import java.util.HashMap;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import com.patriotsar.XMLfunctions;
import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
public class ShowXMLPAR extends ListActivity {
private Button backButton;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.listplaceholder);
backButton = (Button)findViewById(R.id.backButton);
backButton.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View view){
Intent myIntent = new Intent(view.getContext(), patriosar.class);
startActivityForResult(myIntent, 0);
}
});
ArrayList<HashMap<String, String>> mylist = new ArrayList<HashMap<String, String>>();
String xml = XMLfunctions.getXML();
Document doc = XMLfunctions.XMLfromString(xml);
int numResults = XMLfunctions.numResults(doc);
if((numResults <= 0)){
Toast.makeText(ShowXMLPAR.this, "Geen resultaten gevonden", Toast.LENGTH_LONG).show();
finish();
}
NodeList nodes = doc.getElementsByTagName("result");
for (int i = 0; i < nodes.getLength(); i++) {
HashMap<String, String> map = new HashMap<String, String>();
Element e = (Element)nodes.item(i);
map.put("main_content", XMLfunctions.getValue(e, "content"));
map.put("name", XMLfunctions.getValue(e, "name"));
mylist.add(map);
}
//
ListAdapter adapter = new SimpleAdapter(ShowXMLPAR.this, mylist , R.layout.listlayout,
new String[] {"main_content", "name" },
new int[] { R.id.item_title, R.id.item_subtitle });
setListAdapter(adapter);
}
}
XMLfunctions.java:
package com.patriotsar;
import java.io.IOException;
import java.io.StringReader;
import java.io.UnsupportedEncodingException;
import java.net.MalformedURLException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
public class XMLfunctions {
public final static Document XMLfromString(String xml){
Document doc = null;
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
try {
DocumentBuilder db = dbf.newDocumentBuilder();
InputSource is = new InputSource();
is.setCharacterStream(new StringReader(xml));
doc = db.parse(is);
} catch (ParserConfigurationException e) {
System.out.println("XML parse error: " + e.getMessage());
return null;
} catch (SAXException e) {
System.out.println("Wrong XML file structure: " + e.getMessage());
return null;
} catch (IOException e) {
System.out.println("I/O exeption: " + e.getMessage());
return null;
}
return doc;
}
/** Returns element value
* #param elem element (it is XML tag)
* #return Element value otherwise empty String
*/
public final static String getElementValue( Node elem ) {
Node kid;
if( elem != null){
if (elem.hasChildNodes()){
for( kid = elem.getFirstChild(); kid != null; kid = kid.getNextSibling() ){
if( kid.getNodeType() == Node.TEXT_NODE ){
return kid.getNodeValue();
}
}
}
}
return "";
}
public static String getXML(){
String line = null;
try {
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpGet httpPost = new HttpGet("http://www.patriotsar.com/patriot_quotes.xml");
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
line = EntityUtils.toString(httpEntity);
} catch (UnsupportedEncodingException e) {
line = "<results status=\"error\"><msg>Can't connect to server</msg></results>";
} catch (MalformedURLException e) {
line = "<results status=\"error\"><msg>Can't connect to server</msg></results>";
} catch (IOException e) {
line = "<results status=\"error\"><msg>Can't connect to server</msg></results>";
}
return line;
}
public static int numResults(Document doc){
Node results = doc.getDocumentElement();
int res = -1;
try{
res = Integer.valueOf(results.getAttributes().getNamedItem("count").getNodeValue());
}catch(Exception e ){
res = -1;
}
return res;
}
public static String getValue(Element item, String str) {
NodeList n = item.getElementsByTagName(str);
return XMLfunctions.getElementValue(n.item(0));
}
}
Sorry I am still learning but am excited to get into more advanced (for me) programming. Any Help would be awesome.
As of now the app works but calls the same xml no matter what.

I'm not following your description very well, but if you are wanting to pass data between Activities via Intents then make sure the data you pass can either be included as an Extra, or if you prefer to send actual objects then make sure your objects implement the Parcelable interface.