Execution Failed for task :app:compileDebugJavaWithJavac and error ';' expected

Execution Failed for task :app:compileDebugJavaWithJavac and error ';' expected - java

I'm trying to create a slider in Android Studio and encountered 2 errors in my code. Here is the first one.
Here is the error:
'error: ';' expected
This is the line in which the error occured
If (Build.VERSION.SDK_INT)=Build.VERSION_CODES.LOLLIPOP)
{
Window window = getWindow();
window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
window.setStatusBarColor(Color.TRANSPARENT);
}
And the second error is this, but I don't have any idea where to look for this error since I'm just new to java and this is the first time I encountered this.
Error:Execution failed for task ':app:compileDebugJavaWithJavac'.
> Compilation failed; see the compiler error output for details.
This is my complete code.
package mac.mac.dictionary;
import android.content.Context;
import android.content.Intent;
import android.graphics.Color;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.Html;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.widget.LinearLayout;
public class MainActivity extends AppCompatActivity {
private Viewpager viewpager;
private Intromanager intromanager;
private ViewPagerAdapter viewPagerAdapter;
private TextView[] dots;
Button next,skip;
private LinearLayout dotsLayout;
private int[] layouts;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
intromanager = new Intromanager(this);
if(!intromanager.Check())
{
intromanager.setFirst(false);
Intent i = new Intent(MainActivity.this, Main2Activity.class);
startActivity(i);
finish();
}
if(Build.VERSION.SDK_INT>=21)
{
getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE|View.SYSTEM_UI_FLAG_FULLSCREEN);
}
setContentView(R.layout.activity_main);
viewPager = (ViewPager)findViewById(R.id.view_pager);
dotsLayout=(LinearLayout)findViewById(R.id.LayoutDots);
skip=(Button)findViewById(R.id.btn_skip);
next=(Button)findViewById(R.id.btn_next);
layouts = new int[]{R.layout.activity_screen_1,R.layout.activity_screen_2,R.layout.activity_screen_3};
addBottomDots(0);
changeStatusBarColor();
viewPagerAdapter = new ViewPagerAdapter();
viewPager.setAdapter(viewPagerAdapter);
viewPager.addOnPageChangeListener(viewListener);
skip.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View view) {
Intent i = new Intent(MainActivity.this, Main2Activity.class);
startActivity(i);
finish();
}
});
next.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View view) {
int current = getItem(+1);
if(current<layouts.length)
{
viewpager.setCurrentItem(current);
}
else
{
Intent i = new Intent(MainActivity.this, Main2Activity.class);
startActivity(i);
finish();
}
}
});
}
private void addBottomDots(int position)
{
dots = new TextView[layouts.length];
int[] colorActive = getResources().getIntArray(R.array.dot_active);
int[] colorInactive = getResources().getIntArray(R.array.dot_inactive);
dotsLayout.removeAllViews();
for(int i=0; i<dots.length; i++)
{
dots[i]=new TextView(this);
dots[i].setText(Html.fromHtml("&#8226"));
dots[i].setTextSize(35);
dots[i].setTextColor(colorInactive[position]);
dotsLayout.addView(dots[i]);
}
if(dots.length>0)
dots[position].setTextColor(colorActive[position]);
}
private int getItem(int i)
{
return viewPager.getCurrentItem() + 1;
}
Viewpager.OnPageChangeListener viewListener = new ViewPager.OnPageChangeListener()
{
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
#Override
public void onPageSelected(int position) {
addBottomDots(position);
if(position==layouts.length-1)
{
next.setText("PROCEED");
skip.setVisibility(View.GONE);
}
else
{
next.setText("NEXT");
skip.setVisibility(View.VISIBLE);
}
}
#Override
public void onPageScrollStateChanged(int state) {
}
};
private void changeStatusBarColor()
{
If (Build.VERSION.SDK_INT)=Build.VERSION_CODES.LOLLIPOP)
{
Window window = getWindow();
window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
window.setStatusBarColor(Color.TRANSPARENT);
}
}
public class ViewPagerAdapter extends PagerAdapter
{
private LayoutInflater layoutInflater;
#Override
public Object instantiateItem(ViewGroup container, int position) {
layoutInflater = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View v = layoutInflater.inflate(layouts[position],container,false);
container.addView(v);
return v;
}
#Override
public int getCount() {
return layouts.length;
}
#Override
public boolean isViewFromObject(View view, Object object) {
return view==object;
}
#Override
public void destroyItem(ViewGroup container, int position, Object object) {
View v =(View)object;
container.removeView(v);
}
}
}

if (Build.VERSION.SDK_INT==Build.VERSION_CODES.LOLLIPOP)
try this

Related

Activity Reloads with Previous Selected Data Bug

So i developed an android news app. A spinner item is available on the toolbar and data reloads according to spinner selection. However, when the data reloads, for some of the items, it directly loads the relevant content but for some others, it loads the previously selected spinner data. Current data for the current item only shows after reloading same spinner data using the swipe refresh functionality which i had implemented. I want the correct data relevant to that selection to load the first time itself without having to refresh all the time.
Below is my MainActivity where all these functions are called.
package com.example.app.activities;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Color;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.design.widget.AppBarLayout;
import android.support.design.widget.BottomNavigationView;
import android.support.design.widget.CoordinatorLayout;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;
import com.android.volley.DefaultRetryPolicy;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.RetryPolicy;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import com.google.firebase.messaging.FirebaseMessaging;
import com.squareup.picasso.Picasso;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import com.example.app.Config;
import com.example.app.R;
import com.example.app.fragment.FragmentCategory;
import com.example.app.fragment.FragmentFavorite;
import com.example.app.fragment.FragmentProfile;
import com.example.app.fragment.FragmentRecent;
import com.example.app.fragment.FragmentVideo;
import com.example.app.utils.AppBarLayoutBehavior;
import com.example.app.utils.Constant;
import com.example.app.utils.GDPR;
import uk.co.chrisjenx.calligraphy.CalligraphyConfig;
public class MainActivity extends AppCompatActivity {
String URL="url" //outputs JSON data
private long exitTime = 0;
MyApplication myApplication;
View view;
private BottomNavigationView navigation;
public ViewPager viewPager;
private Toolbar toolbar;
MenuItem prevMenuItem;
int pager_number = 5;
BroadcastReceiver broadcastReceiver;
Spinner mySpinner;
ArrayList<String> spinnerConstituencyName;
int spinConstID;
private PrefManager prefManager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//Set Font
CalligraphyConfig.initDefault(new CalligraphyConfig.Builder()
.setDefaultFontPath("fonts/Arkhip_font.ttf")
.setFontAttrId(R.attr.fontPath)
.build());
setContentView(R.layout.activity_main);
view = findViewById(android.R.id.content);
if (Config.ENABLE_RTL_MODE) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
getWindow().getDecorView().setLayoutDirection(View.LAYOUT_DIRECTION_RTL);
}
}
AppBarLayout appBarLayout = findViewById(R.id.tab_appbar_layout);
((CoordinatorLayout.LayoutParams) appBarLayout.getLayoutParams()).setBehavior(new AppBarLayoutBehavior());
myApplication = MyApplication.getInstance();
toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
toolbar.setTitle(R.string.app_name);
spinnerConstituencyName = new ArrayList<>();
mySpinner = findViewById(R.id.mySpinner);
prefManager = new PrefManager(MainActivity.this);
loadSpinnerData(URL);
mySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
int check = 0;
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
/*String spinConstituency = mySpinner.getItemAtPosition(mySpinner.getSelectedItemPosition()).toString();
Toast.makeText(getApplicationContext(), spinConstituency, Toast.LENGTH_LONG).show();*/
if (++check > 1) {
Intent intent = getIntent(); //MainActivity
String itemSelected = mySpinner.getItemAtPosition(mySpinner.getSelectedItemPosition()).toString();
//TODO: DONE
//intent.putExtra("NAME_KEY", itemSelected);
prefManager.spinWriteString(itemSelected);
Toast.makeText(getApplicationContext(), "Constituency News Now Showing", Toast.LENGTH_SHORT).show();
startActivity(intent);
finish();
}
}
#Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
viewPager = findViewById(R.id.viewpager);
viewPager.setAdapter(new MyAdapter(getSupportFragmentManager()));
viewPager.setOffscreenPageLimit(pager_number);
navigation = findViewById(R.id.navigation);
navigation.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.navigation_home:
viewPager.setCurrentItem(0);
return true;
case R.id.navigation_category:
viewPager.setCurrentItem(1);
return true;
case R.id.navigation_video:
viewPager.setCurrentItem(2);
return true;
case R.id.navigation_favorite:
viewPager.setCurrentItem(3);
return true;
case R.id.navigation_profile:
viewPager.setCurrentItem(4);
return true;
}
return false;
}
});
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
#Override
public void onPageSelected(int position) {
if (prevMenuItem != null) {
prevMenuItem.setChecked(false);
} else {
navigation.getMenu().getItem(0).setChecked(false);
}
navigation.getMenu().getItem(position).setChecked(true);
prevMenuItem = navigation.getMenu().getItem(position);
if (viewPager.getCurrentItem() == 1) {
toolbar.setTitle(getResources().getString(R.string.title_nav_category));
} else if (viewPager.getCurrentItem() == 2) {
toolbar.setTitle(getResources().getString(R.string.title_nav_video));
} else if (viewPager.getCurrentItem() == 3) {
toolbar.setTitle(getResources().getString(R.string.title_nav_favorite));
} else if (viewPager.getCurrentItem() == 4) {
toolbar.setTitle(getResources().getString(R.string.title_nav_favorite));
} else {
toolbar.setTitle(R.string.app_name);
}
}
#Override
public void onPageScrollStateChanged(int state) {
}
});
if (Config.ENABLE_RTL_MODE) {
viewPager.setRotationY(180);
}
broadcastReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
// checking for type intent filter
if (intent.getAction().equals(Constant.REGISTRATION_COMPLETE)) {
// now subscribe to global topic to receive app wide notifications
FirebaseMessaging.getInstance().subscribeToTopic(Constant.TOPIC_GLOBAL);
} else if (intent.getAction().equals(Constant.PUSH_NOTIFICATION)) {
// new push notification is received
String message = intent.getStringExtra("message");
Toast.makeText(getApplicationContext(), "Push notification: " + message, Toast.LENGTH_LONG).show();
}
}
};
Intent intent = getIntent();
final String message = intent.getStringExtra("message");
final String imageUrl = intent.getStringExtra("image");
final long nid = intent.getLongExtra("id", 0);
final String link = intent.getStringExtra("link");
if (message != null) {
LayoutInflater layoutInflaterAndroid = LayoutInflater.from(MainActivity.this);
View mView = layoutInflaterAndroid.inflate(R.layout.custom_dialog_notif, null);
final AlertDialog.Builder alert = new AlertDialog.Builder(MainActivity.this);
alert.setView(mView);
final TextView notification_title = mView.findViewById(R.id.news_title);
final TextView notification_message = mView.findViewById(R.id.news_message);
final ImageView notification_image = mView.findViewById(R.id.news_image);
if (imageUrl.endsWith(".jpg") || imageUrl.endsWith(".jpeg") || imageUrl.endsWith(".png") || imageUrl.endsWith(".gif")) {
notification_title.setText(message);
notification_message.setVisibility(View.GONE);
Picasso.with(MainActivity.this)
.load(imageUrl.replace(" ", "%20"))
.placeholder(R.drawable.ic_thumbnail)
.resize(200, 200)
.centerCrop()
.into(notification_image);
alert.setPositiveButton(R.string.dialog_read_more, new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
Intent intent = new Intent(getApplicationContext(), ActivityNotificationDetail.class);
intent.putExtra("id", nid);
startActivity(intent);
}
});
alert.setNegativeButton(R.string.dialog_dismiss, null);
} else {
notification_title.setText(getResources().getString(R.string.app_name));
notification_message.setVisibility(View.VISIBLE);
notification_message.setText(message);
notification_image.setVisibility(View.GONE);
//Toast.makeText(getApplicationContext(), "link : " + link, Toast.LENGTH_SHORT).show();
if (!link.equals("")) {
alert.setPositiveButton("Continue", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
Intent open = new Intent(Intent.ACTION_VIEW, Uri.parse(link));
startActivity(open);
}
});
alert.setNegativeButton(R.string.dialog_dismiss, null);
} else {
alert.setPositiveButton(R.string.dialog_ok, null);
}
}
alert.setCancelable(false);
alert.show();
}
GDPR.updateConsentStatus(this);
}
public class MyAdapter extends FragmentPagerAdapter {
private MyAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return new FragmentRecent();
case 1:
return new FragmentCategory();
case 2:
return new FragmentVideo();
case 3:
return new FragmentFavorite();
case 4:
return new FragmentProfile();
}
return null;
}
#Override
public int getCount() {
return pager_number;
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem menuItem) {
switch (menuItem.getItemId()) {
case R.id.search:
Intent intent = new Intent(getApplicationContext(), ActivitySearch.class);
startActivity(intent);
return true;
default:
return super.onOptionsItemSelected(menuItem);
}
}
#Override
public void onBackPressed() {
if (viewPager.getCurrentItem() != 0) {
viewPager.setCurrentItem((0), true);
} else {
exitApp();
}
}
public void exitApp() {
if ((System.currentTimeMillis() - exitTime) > 2000) {
Toast.makeText(this, getString(R.string.press_again_to_exit), Toast.LENGTH_SHORT).show();
exitTime = System.currentTimeMillis();
} else {
finish();
}
}
#Override
protected void onResume() {
super.onResume();
}
private int getIndex(Spinner spinner, String myString){
int index = 0;
for (int i=0;i < spinner.getCount(); i++) {
if (spinner.getItemAtPosition(i).equals(myString)) {
index = i;
}
}
return index;
}
private void loadSpinnerData(String url) {
RequestQueue requestQueue = Volley.newRequestQueue(getApplicationContext());
StringRequest stringRequest = new StringRequest(Request.Method.GET, url, new Response.Listener<String>() {
#Override
public void onResponse(String response) {
//TODO DONE
String name = prefManager.spinReadString();
try{
JSONObject jsonObject=new JSONObject(response);
if(jsonObject.getString("status").equals("ok")){
JSONArray jsonArray=jsonObject.getJSONArray("constituencies");
for(int i = 0; i < jsonArray.length(); i++){
JSONObject jsonObject1=jsonArray.getJSONObject(i);
String spinConstituency=jsonObject1.getString("constituency_name");
//TODO DONE
if (spinConstituency.equals(name))
spinConstID = jsonObject1.getInt("const_id");
spinnerConstituencyName.add(spinConstituency);
}
//TODO DONE
prefManager.writeString("" + spinConstID);
}
ArrayAdapter<String> myAdapter = new ArrayAdapter<String>(MainActivity.this,
R.layout.custom_spinner_item, spinnerConstituencyName){
#Override
public View getDropDownView(int position, View convertView,
ViewGroup parent) {
View view = super.getDropDownView(position, convertView, parent);
TextView tv = (TextView) view;
if(position % 2 == 1) {
// Set the item background color
tv.setBackgroundColor(Color.parseColor("#910D3F"));
}
else {
// Set the alternate item background color
tv.setBackgroundColor(Color.parseColor("#41061C"));
}
return view;
}
};
mySpinner.setPrompt("Select Your Constituency");
myAdapter.setDropDownViewResource(R.layout.custom_spinner_item);
mySpinner.setAdapter(myAdapter);
//RECEIVE DATA VIA INTENT
mySpinner.setSelection(getIndex(mySpinner, name));
}catch (JSONException e){e.printStackTrace();}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
error.printStackTrace();
}
});
int socketTimeout = 30000;
RetryPolicy policy = new DefaultRetryPolicy(socketTimeout, DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT);
stringRequest.setRetryPolicy(policy);
requestQueue.add(stringRequest);
}
}

I discovered that from API level 3, one can use the onUserInteraction() on an Activity with a boolean value thereby determining the user's interaction.
Find the documentation in the link below.
http://developer.android.com/reference/android/app/Activity.html#onUserInteraction()
#Override
public void onUserInteraction() {
super.onUserInteraction();
userInteracts = true;
}
The my adjustment goes as thus in the MainActivity.java
mySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
int check = 0;
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
if (IsInteracting) {
Intent intent = getIntent(); //MainActivity
String itemSelected = mySpinner.getItemAtPosition(mySpinner.getSelectedItemPosition()).toString();
//TODO: DONE
prefManager.spinWriteString(itemSelected);
Toast.makeText(getApplicationContext(), "Constituency News Now Showing", Toast.LENGTH_SHORT).show();
startActivity(intent);
finish();
}
}

Reload Data on Spinner itemSelected

I guess i'm implementing the spinner onItemSelected inappropriately.
So i have spinner values loaded from my database. I'm trying to load data according to the spinner selected but the spinner doesn't persist and the id doesn't pass to the activity. It loads a default id of 1 instead of the selected spinner id. So i'm not sure if the spinner id is being passed. How do i check these and correct them?
package com.example.app;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Color;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.design.widget.AppBarLayout;
import android.support.design.widget.BottomNavigationView;
import android.support.design.widget.CoordinatorLayout;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;
import com.android.volley.DefaultRetryPolicy;
import com.android.volley.Response;
import com.android.volley.RetryPolicy;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.google.firebase.messaging.FirebaseMessaging;
import com.example.app.Config;
import com.example.app.R;
import com.example.app.fragment.FragmentCategory;
import com.example.app.fragment.FragmentFavorite;
import com.example.app.fragment.FragmentProfile;
import com.example.app.fragment.FragmentRecent;
import com.example.app.fragment.FragmentVideo;
import com.example.app.models.Constituency;
import com.example.app.utils.AppBarLayoutBehavior;
import com.example.app.utils.Constant;
import com.example.app.utils.GDPR;
import com.squareup.picasso.Picasso;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.toolbox.Volley;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import uk.co.chrisjenx.calligraphy.CalligraphyConfig;
public class MainActivity extends AppCompatActivity {
String URL="https://xxx.xxx.xxx/api/get_constituency_index/?api_key="+
Config.API_KEY;
private long exitTime = 0;
MyApplication myApplication;
View view;
private BottomNavigationView navigation;
public ViewPager viewPager;
private Toolbar toolbar;
MenuItem prevMenuItem;
int pager_number = 5;
BroadcastReceiver broadcastReceiver;
Spinner mySpinner;
ArrayList<String> spinnerConstituencyName;
int spinConstID;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//Set Font
CalligraphyConfig.initDefault(new CalligraphyConfig.Builder()
.setDefaultFontPath("fonts/Arkhip_font.ttf")
.setFontAttrId(R.attr.fontPath)
.build());
setContentView(R.layout.activity_main);
view = findViewById(android.R.id.content);
if (Config.ENABLE_RTL_MODE) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
getWindow().getDecorView().setLayoutDirection(View.LAYOUT_DIRECTION_RTL);
}
}
AppBarLayout appBarLayout = findViewById(R.id.tab_appbar_layout);
((CoordinatorLayout.LayoutParams) appBarLayout.getLayoutParams()).setBehavior(new AppBarLayoutBehavior());
myApplication = MyApplication.getInstance();
toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
toolbar.setTitle(R.string.app_name);
spinnerConstituencyName = new ArrayList<>();
mySpinner = findViewById(R.id.mySpinner);
loadSpinnerData(URL);
mySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
int check = 0;
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
/*String spinConstituency = mySpinner.getItemAtPosition(mySpinner.getSelectedItemPosition()).toString();
Toast.makeText(getApplicationContext(), spinConstituency, Toast.LENGTH_LONG).show();*/
if ( ++check > 1 ){
PrefManager prefManager = new PrefManager(MainActivity.this);
prefManager.writeString("" + spinConstID);
Intent intent = getIntent();
startActivity(intent);
Toast.makeText(getApplicationContext(), mySpinner.getItemAtPosition(mySpinner.getSelectedItemPosition()).toString() + " Showing", Toast.LENGTH_SHORT).show();
finish();
}
}
#Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
viewPager = findViewById(R.id.viewpager);
viewPager.setAdapter(new MyAdapter(getSupportFragmentManager()));
viewPager.setOffscreenPageLimit(pager_number);
navigation = findViewById(R.id.navigation);
navigation.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.navigation_home:
viewPager.setCurrentItem(0);
return true;
case R.id.navigation_category:
viewPager.setCurrentItem(1);
return true;
case R.id.navigation_video:
viewPager.setCurrentItem(2);
return true;
case R.id.navigation_favorite:
viewPager.setCurrentItem(3);
return true;
case R.id.navigation_profile:
viewPager.setCurrentItem(4);
return true;
}
return false;
}
});
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
#Override
public void onPageSelected(int position) {
if (prevMenuItem != null) {
prevMenuItem.setChecked(false);
} else {
navigation.getMenu().getItem(0).setChecked(false);
}
navigation.getMenu().getItem(position).setChecked(true);
prevMenuItem = navigation.getMenu().getItem(position);
if (viewPager.getCurrentItem() == 1) {
toolbar.setTitle(getResources().getString(R.string.title_nav_category));
} else if (viewPager.getCurrentItem() == 2) {
toolbar.setTitle(getResources().getString(R.string.title_nav_video));
} else if (viewPager.getCurrentItem() == 3) {
toolbar.setTitle(getResources().getString(R.string.title_nav_favorite));
} else if (viewPager.getCurrentItem() == 4) {
toolbar.setTitle(getResources().getString(R.string.title_nav_favorite));
} else {
toolbar.setTitle(R.string.app_name);
}
}
#Override
public void onPageScrollStateChanged(int state) {
}
});
if (Config.ENABLE_RTL_MODE) {
viewPager.setRotationY(180);
}
broadcastReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
// checking for type intent filter
if (intent.getAction().equals(Constant.REGISTRATION_COMPLETE)) {
// now subscribe to global topic to receive app wide notifications
FirebaseMessaging.getInstance().subscribeToTopic(Constant.TOPIC_GLOBAL);
} else if (intent.getAction().equals(Constant.PUSH_NOTIFICATION)) {
// new push notification is received
String message = intent.getStringExtra("message");
Toast.makeText(getApplicationContext(), "Push notification: " + message, Toast.LENGTH_LONG).show();
}
}
};
Intent intent = getIntent();
final String message = intent.getStringExtra("message");
final String imageUrl = intent.getStringExtra("image");
final long nid = intent.getLongExtra("id", 0);
final String link = intent.getStringExtra("link");
if (message != null) {
LayoutInflater layoutInflaterAndroid = LayoutInflater.from(MainActivity.this);
View mView = layoutInflaterAndroid.inflate(R.layout.custom_dialog_notif, null);
final AlertDialog.Builder alert = new AlertDialog.Builder(MainActivity.this);
alert.setView(mView);
final TextView notification_title = mView.findViewById(R.id.news_title);
final TextView notification_message = mView.findViewById(R.id.news_message);
final ImageView notification_image = mView.findViewById(R.id.news_image);
if (imageUrl.endsWith(".jpg") || imageUrl.endsWith(".jpeg") || imageUrl.endsWith(".png") || imageUrl.endsWith(".gif")) {
notification_title.setText(message);
notification_message.setVisibility(View.GONE);
Picasso.with(MainActivity.this)
.load(imageUrl.replace(" ", "%20"))
.placeholder(R.drawable.ic_thumbnail)
.resize(200, 200)
.centerCrop()
.into(notification_image);
alert.setPositiveButton(R.string.dialog_read_more, new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
Intent intent = new Intent(getApplicationContext(), ActivityNotificationDetail.class);
intent.putExtra("id", nid);
startActivity(intent);
}
});
alert.setNegativeButton(R.string.dialog_dismiss, null);
} else {
notification_title.setText(getResources().getString(R.string.app_name));
notification_message.setVisibility(View.VISIBLE);
notification_message.setText(message);
notification_image.setVisibility(View.GONE);
//Toast.makeText(getApplicationContext(), "link : " + link, Toast.LENGTH_SHORT).show();
if (!link.equals("")) {
alert.setPositiveButton("Continue", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
Intent open = new Intent(Intent.ACTION_VIEW, Uri.parse(link));
startActivity(open);
}
});
alert.setNegativeButton(R.string.dialog_dismiss, null);
} else {
alert.setPositiveButton(R.string.dialog_ok, null);
}
}
alert.setCancelable(false);
alert.show();
}
GDPR.updateConsentStatus(this);
}
public class MyAdapter extends FragmentPagerAdapter {
private MyAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return new FragmentRecent();
case 1:
return new FragmentCategory();
case 2:
return new FragmentVideo();
case 3:
return new FragmentFavorite();
case 4:
return new FragmentProfile();
}
return null;
}
#Override
public int getCount() {
return pager_number;
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem menuItem) {
switch (menuItem.getItemId()) {
case R.id.search:
Intent intent = new Intent(getApplicationContext(), ActivitySearch.class);
startActivity(intent);
return true;
default:
return super.onOptionsItemSelected(menuItem);
}
}
#Override
public void onBackPressed() {
if (viewPager.getCurrentItem() != 0) {
viewPager.setCurrentItem((0), true);
} else {
exitApp();
}
}
public void exitApp() {
if ((System.currentTimeMillis() - exitTime) > 2000) {
Toast.makeText(this, getString(R.string.press_again_to_exit), Toast.LENGTH_SHORT).show();
exitTime = System.currentTimeMillis();
} else {
finish();
}
}
#Override
protected void onResume() {
super.onResume();
}
private int getIndex(Spinner spinner, String myString){
int index = 0;
for (int i=0;i<spinner.getCount();i++){
if (spinner.getItemAtPosition(i).equals(myString)){
index = i;
}
}
return index;
}
private void loadSpinnerData(String url) {
RequestQueue requestQueue=Volley.newRequestQueue(getApplicationContext());
StringRequest stringRequest=new StringRequest(Request.Method.GET, url, new Response.Listener<String>() {
#Override
public void onResponse(String response) {
try{
JSONObject jsonObject=new JSONObject(response);
if(jsonObject.getString("status").equals("ok")){
JSONArray jsonArray=jsonObject.getJSONArray("constituencies");
for(int i=0;i<jsonArray.length();i++){
JSONObject jsonObject1=jsonArray.getJSONObject(i);
String spinConstituency=jsonObject1.getString("constituency_name");
spinConstID = jsonObject1.getInt("const_id");
spinnerConstituencyName.add(spinConstituency);
}
}
ArrayAdapter<String> myAdapter = new ArrayAdapter<String>(MainActivity.this,
R.layout.custom_spinner_item, spinnerConstituencyName){
#Override
public View getDropDownView(int position, View convertView,
ViewGroup parent) {
View view = super.getDropDownView(position, convertView, parent);
TextView tv = (TextView) view;
if(position%2 == 1) {
// Set the item background color
tv.setBackgroundColor(Color.parseColor("#910D3F"));
}
else {
// Set the alternate item background color
tv.setBackgroundColor(Color.parseColor("#41061C"));
}
return view;
}
};
mySpinner.setPrompt("Select Your Constituency");
myAdapter.setDropDownViewResource(R.layout.custom_spinner_item);
mySpinner.setAdapter(myAdapter);
//RECEIVE DATA VIA INTENT
Intent i = getIntent();
String name = i.getStringExtra("NAME_KEY");
mySpinner.setSelection(getIndex(mySpinner, name));
}catch (JSONException e){e.printStackTrace();}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
error.printStackTrace();
}
});
int socketTimeout = 30000;
RetryPolicy policy = new DefaultRetryPolicy(socketTimeout, DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT);
stringRequest.setRetryPolicy(policy);
requestQueue.add(stringRequest);
}
}

Here is the problem (On Spinner Item selection)
Intent intent = getIntent();
startActivity(intent);
Toast.makeText(getApplicationContext(), mySpinner.getItemAtPosition(mySpinner.getSelectedItemPosition()).toString() + " Showing", Toast.LENGTH_SHORT).show();
finish();
**You are starting current activity as new and finish current activity, it means when you select any of items from spinner it will start a new activity and your on create executed again and again, so please place other logic or you can send your values in your activity using intent.putextra() and check in oncreate for null and if values is not null you can set spinner.setSelected(Your Position). For Fragment You can use
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.detach(ComingSoonFragment.this).attach(ComingSoonFragment.this).commit();
for refresh your fragment and pass your data with bundle and check for null if your bundle is null then use your code for defalt and if not null then set your data according to your id.
**
Thanks

In your spinner inside OnItemSelectedListener use parent.getItemAtPosition(position) to get the correct value
mySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
Toast.makeText(parent.getContext(),
"OnItemSelectedListener : " + parent.getItemAtPosition(position).toString(),
Toast.LENGTH_SHORT).show();
//Do your staff here
}
#Override
public void onNothingSelected(AdapterView<?> parent) {
}
});

Attempt to invoke virtual method [Null object reference] [duplicate]

This question already has answers here:
What is a NullPointerException, and how do I fix it?
(12 answers)
Closed 4 years ago.
I'm spending the last 5 days trying solve this problem. I really do not have any idea about how to solve it. I'm getting Attempt to invoke virtual method 'android.view.Window$Callback android.view.Window.getCallback()' on a null object reference. Check my code:
RecyclerView.java
package etes.xdda.music;
import android.app.Dialog;
import android.content.Context;
import android.content.Intent;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.media.MediaPlayer;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import java.util.List;
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.MyViewHolder> implements View.OnClickListener{
Context mContext;
List<mList> mData;
Dialog myDialog;
private MediaPlayer mediaPlayer;
private int playbackPosition=0;
private LinearLayout menu_dialog;
public RecyclerViewAdapter(Context mContext, List<mList> mData) {
this.mContext = mContext;
this.mData = mData;
}
public void onClick(View view) {
}
#Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v;
v = LayoutInflater.from(mContext).inflate(R.layout.item_list, parent, false);
final MyViewHolder vHolder = new MyViewHolder(v);
// Dialog ini
myDialog = new Dialog(mContext);
myDialog.setContentView(R.layout.dialog);
myDialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
vHolder.item_play.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v)
{
TextView dialog_name_tv = (TextView) myDialog.findViewById(R.id.dialog_name_id);
TextView dialog_phone_tv = (TextView) myDialog.findViewById(R.id.dialog_author_id);
ImageView dialog_contact_img = (ImageView) myDialog.findViewById(R.id.dialog_img);
dialog_name_tv.setText(mData.get(vHolder.getAdapterPosition()).getName());
dialog_phone_tv.setText(mData.get(vHolder.getAdapterPosition()).getPhone());
dialog_contact_img.setImageResource(mData.get(vHolder.getAdapterPosition()).getPhoto());
//Toast.makeText(mContext, "Test click "+String.valueOf(vHolder.getAdapterPosition()), Toast.LENGTH_SHORT).show();
myDialog.show();
}
});
vHolder.menu_play.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v)
{
menu_dialog = v.getRootView().findViewById(R.id.menu_dialog);
menu_dialog.setVisibility(v.VISIBLE);
MainActivity a = new MainActivity();
a.initAudio(v.getContext(), mData.get(vHolder.getAdapterPosition()).getURL());
MainActivity.setMargins(v.getRootView().findViewById(R.id.viewpager_id), 0,0,0,100);
}
});
return vHolder;
}
#Override
public void onBindViewHolder(MyViewHolder holder, int position) {
holder.tv_name.setText(mData.get(position).getName());
holder.tv_author.setText(mData.get(position).getPhone());
holder.img.setImageResource(mData.get(position).getPhoto());
}
#Override
public int getItemCount() {
return mData.size();
}
public static class MyViewHolder extends RecyclerView.ViewHolder {
private ImageButton item_play;
private LinearLayout menu_play;
private TextView tv_name;
private TextView tv_author;
private TextView tv_url;
private ImageView img;
public MyViewHolder(View itemView) {
super(itemView);
item_play = itemView.findViewById(R.id.info_id);
menu_play = itemView.findViewById(R.id.list_item_id);
tv_name = (TextView) itemView.findViewById(R.id.name_list);
tv_author = (TextView) itemView.findViewById(R.id.author_list);
img = (ImageView) itemView.findViewById(R.id.img_contact);
}
}
}
Note that I'm invoking MainActivity.java in this part:
vHolder.menu_play.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v)
{
menu_dialog = v.getRootView().findViewById(R.id.menu_dialog);
menu_dialog.setVisibility(v.VISIBLE);
MainActivity a = new MainActivity();
a.initAudio(v.getContext(), mData.get(vHolder.getAdapterPosition()).getURL());
MainActivity.setMargins(v.getRootView().findViewById(R.id.viewpager_id), 0,0,0,100);
}
});
And here's my MainActivity.java
package etes.xdda.music;
import android.annotation.SuppressLint;
import android.content.Context;
import android.media.MediaPlayer;
import android.net.Uri;
import android.support.design.widget.TabLayout;
import android.support.v4.view.ViewPager;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageButton;
import android.widget.LinearLayout;
public class MainActivity extends AppCompatActivity {
private DrawerLayout nDrawerLayout;
private ActionBarDrawerToggle mToggle;
private TabLayout tabLayout;
private ViewPager viewPager;
private viewPagerAdapter adapter;
public LinearLayout menu_dialog;
private String player_status = "playing";
private ImageButton player_img;
private static MediaPlayer mediaPlayer;
#SuppressLint("RestrictedApi")
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
nDrawerLayout = findViewById(R.id.drawer);
menu_dialog = findViewById(R.id.menu_dialog);
menu_dialog.setVisibility(View.GONE);
player_img = findViewById(R.id.playorpause);
player_img.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//setMargins(viewPager, 0,0,0,110);
if (player_status == "playing") {
player_img.setImageResource(R.drawable.ic_play_arrow_black_24dp);
meplayer.pauseAudio();
player_status = "paused";
} else {
player_img.setImageResource(R.drawable.ic_pause_black_24dp);
meplayer.startAudio();
player_status = "playing";
}
}
});
//menu_dialog.setLayoutParams(new LinearLayout.LayoutParams(0, 0));
mToggle = new ActionBarDrawerToggle(this, nDrawerLayout, R.string.open, R.string.close);
nDrawerLayout.addDrawerListener(mToggle);
getSupportActionBar().setDefaultDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
tabLayout = findViewById(R.id.tablayout_id);
viewPager = findViewById(R.id.viewpager_id);
//viewPager.setLayoutParams(new ViewPager.LayoutParams(0, 0));
//setMarginBottom(viewPager, 0);
setMargins(viewPager, 0,0,0,0);
adapter = new viewPagerAdapter(getSupportFragmentManager());
//Add fragments here
adapter.addFragment(new fragmentList(), ""); //Lista de música
adapter.addFragment(new fragmentFrequent(), ""); //Frequentes
adapter.addFragment(new fragmentPlayList(), ""); //Playlist
viewPager.setAdapter(adapter);
tabLayout.setupWithViewPager(viewPager);
tabLayout.getTabAt(0).setIcon(R.drawable.ic_music_note_black_24dp); //Lista de música
tabLayout.getTabAt(1).setIcon(R.drawable.ic_filter_list_black_24dp); // Frequentes
tabLayout.getTabAt(2).setIcon(R.drawable.ic_queue_music_black_24dp); // Playlist
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
if (mToggle.onOptionsItemSelected(item)) {
return true;
}
return super.onOptionsItemSelected(item);
}
#Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
// Sync the toggle state after onRestoreInstanceState has occurred.
mToggle.syncState();
}
public static void setMargins (View v, int l, int t, int r, int b) {
if (v.getLayoutParams() instanceof ViewGroup.MarginLayoutParams) {
ViewGroup.MarginLayoutParams p = (ViewGroup.MarginLayoutParams) v.getLayoutParams();
p.setMargins(l, t, r, b);
v.requestLayout();
}
}
public void initAudio(final Context context, final String url) {
if (mediaPlayer == null) {
mediaPlayer = MediaPlayer.create(context, Uri.parse(url));
}
mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
#Override
public void onCompletion(MediaPlayer mp) {
//Toast.makeText(context, "TEST", Toast.LENGTH_LONG).show();
killMediaPlayer();
updateLayout();
}
});
mediaPlayer.start();
}
private static void killMediaPlayer() {
if (mediaPlayer != null) {
try {
mediaPlayer.reset();
mediaPlayer.release();
mediaPlayer = null;
} catch (Exception e) {
e.printStackTrace();
}
}
}
private void updateLayout() {
try {
menu_dialog = findViewById(R.id.menu_dialog);
menu_dialog.setVisibility(View.GONE);
} catch (Exception e) {
e.printStackTrace();
}
}
And the part of code that is giving crash is this:
private void updateLayout() {
try {
menu_dialog = findViewById(R.id.menu_dialog);
menu_dialog.setVisibility(View.GONE);
} catch (Exception e) {
e.printStackTrace();
}
}
#edit: I have added this piece of code, I don't know if can help
fragmentList.java
package etes.xdda.music;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonArrayRequest;
import com.android.volley.toolbox.Volley;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.List;
public class fragmentList extends Fragment {
View v;
private RecyclerView myrecyclerview;
private List<mList> lstContact;
private String URL_JSON = "https://pastebin.com/raw/fG3zd40U";
private JsonArrayRequest ArrayRequest;
private RequestQueue requestQueue ;
MainActivity activity;
public fragmentList() {
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
v = inflater.inflate(R.layout.list_fragment,container,false);
myrecyclerview = (RecyclerView) v.findViewById(R.id.list_recyclerview);
RecyclerViewAdapter recyclerViewAdapter = new RecyclerViewAdapter(activity, lstContact);
myrecyclerview.setLayoutManager(new LinearLayoutManager(getActivity()));
myrecyclerview.setAdapter(recyclerViewAdapter);
return v;
}
#Override
public void onCreate(#Nullable Bundle savedInstaceState) {
super.onCreate(savedInstaceState);
_JSONcall();
}
public void _JSONcall() {
lstContact = new ArrayList<>();
ArrayRequest = new JsonArrayRequest(URL_JSON, new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
JSONObject jsonObject = null;
for (int i = 0 ; i<response.length();i++) {
try {
jsonObject = response.getJSONObject(i);
lstContact.add(new mList(jsonObject.getString("name"), jsonObject.getString("description"), jsonObject.getString("link"), R.drawable.ic_play_circle_filled_black_24dp));
}
catch (JSONException e) {
e.printStackTrace();
Toast.makeText(getActivity(), "Error 1!",
Toast.LENGTH_LONG).show();
}
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getActivity(), "Error 3!",
Toast.LENGTH_LONG).show();
}
});
requestQueue = Volley.newRequestQueue(getActivity().getApplicationContext());
requestQueue.add(ArrayRequest);
}
}
Please, help me, I have no more ideas about what I should do. Thank you

Just taking a look at your code, it looks like you are doing many things wrong. Such as this line
MainActivity a = new MainActivity();
You can't instantiate lifecycle components like Services, Activities, Fragments etc this way. Android provides you these components when you call start methods etc. The activity that is created as a result of the above line doesn't go through the lifecycle calls that an activity that is started via using startActivity. As a result, the setContentView of the activity is never called and you get this error. You have to remove this line and implement this properly and the error will go away.
Also just to add, you are actually creating a new instance of the activity when one is already running when you need to call the methods on the old instance that was started.
Edit: Try like this.
MainActivity activity;
List<mList> mData;
Dialog myDialog;
private MediaPlayer mediaPlayer;
private int playbackPosition=0;
private LinearLayout menu_dialog;
public RecyclerViewAdapter(MainActivity activity, List<mList> mData) {
this.activity = activity;
this.mData = mData;
}
And then
vHolder.menu_play.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v)
{
menu_dialog = v.getRootView().findViewById(R.id.menu_dialog);
menu_dialog.setVisibility(v.VISIBLE);
activity.initAudio(v.getContext(), mData.get(vHolder.getAdapterPosition()).getURL());
activity.setMargins(v.getRootView().findViewById(R.id.viewpager_id), 0,0,0,100);
}
});
Also remove static from the main activity functions

Update List View When Clicked on RecycleView Item

I created a listView which is updated on click on item in Reycleview within same page.
Date fetch is working,json data is getting and updated in adpater,but new items is extended with previous data in listview
Layout
First row is RecycleView and Below is Listview, Listview should be update when click on item above in recycleview
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import com.example.sharanjit.fitness.R;
import com.google.gson.JsonArray;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
public class AllExercise extends AppCompatActivity {
ListView list;
ProgressDialog dialog;
Context context;
GetJSONData getJSONData;
String[] name = {"Abdominals","Arms","Back","Chest","Shoulders","Legs","Cardio"};
private RecyclerView mRecyclerView;
private RecyclerView.Adapter mAdapter;
private RecyclerView.LayoutManager mLayoutManager;
AllExerciseAdapter adapter;
ArrayList<Exercise> arrayList;
boolean first=true;
int pos=0;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.allexercises);
dialog=new ProgressDialog(this);
context=getApplicationContext();
getJSONData=new GetJSONData();
arrayList=new ArrayList<>();
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
mRecyclerView = (RecyclerView) findViewById(R.id.recycle);
mRecyclerView.setHasFixedSize(true);
mLayoutManager = new LinearLayoutManager(this,LinearLayoutManager.HORIZONTAL, false);
mRecyclerView.setLayoutManager(mLayoutManager);
mAdapter = new MyAdapter();
mRecyclerView.setAdapter(mAdapter);
new FetchData().execute();
list = (ListView) findViewById(R.id.exercise_list);
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent intent=new Intent(AllExercise.this,ExerciseView.class);
startActivity(intent);
}
});
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id=item.getItemId();
if(id==16908332)
{
finish();
}
return super.onOptionsItemSelected(item);
}
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
public class ViewHolder extends RecyclerView.ViewHolder {
public ImageView imageView;
public ViewHolder(View v) {
super(v);
imageView = (ImageView)v.findViewById(R.id.imageView11);
}
}
public MyAdapter() {
}
#Override
public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.exercise_item, parent, false);
final ViewHolder vh = new ViewHolder(v);
vh.imageView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
pos=vh.getAdapterPosition();
first=false;
new FetchData().execute();
}
});
return vh;
}
#Override
public void onBindViewHolder(ViewHolder holder, final int position) {
final ViewHolder viewHolder=holder;
viewHolder.imageView.setImageResource(Constants.exercise_images[position]);
}
#Override
public int getItemCount() {
return 7;
}
}
public class AllExerciseAdapter extends ArrayAdapter {
final private Context cx;
final private int pos;
AllExerciseAdapter(Context cx,int pos) {
super(cx, R.layout.allexercise_list_item, arrayList);
this.cx = cx;
this.pos=pos;
}
#Override
public View getView(int position, View vw, ViewGroup group) {
vw = View.inflate(cx, R.layout.allexercise_list_item, null);
ImageView imageView=(ImageView)vw.findViewById(R.id.imageView11);
TextView title=(TextView)vw.findViewById(R.id.textView14);
TextView cat=(TextView)vw.findViewById(R.id.textView13);
title.setText(arrayList.get(position).names);
cat.setText(arrayList.get(position).category);
if(position==0)
Log.e("MS",title.getText().toString());
return vw;
}
}
private class FetchData extends AsyncTask<String,String,String>
{
String url="";
String data="";
#Override
protected void onPreExecute() {
super.onPreExecute();
dialog.setMessage("In Progress...");
dialog.setCancelable(false);
dialog.show();
url="http://www.searchdata.in/fitness/get-exercises.php";
try {
data = URLEncoder.encode("category", "UTF-8") + "=" + URLEncoder.encode(name[pos], "UTF-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}
#Override
protected String doInBackground(String... params) {
String s= getJSONData.getData(url,data);
return s;
}
#Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
Log.e("sss",s);
try {
JSONArray array=new JSONArray(s);
for(int i=0;i<array.length();i++)
{
JSONObject object=array.getJSONObject(i);
Exercise exercise=new Exercise();
exercise.names=object.getString("name");
exercise.category=object.getString("category");
exercise.decription=object.getString("description");
arrayList.add(exercise);
}
dialog.dismiss();
} catch (JSONException e) {
e.printStackTrace();
}
Log.e("ss",""+first);
adapter = new AllExerciseAdapter(context,pos);
if(!first) {
list.setAdapter(adapter);
adapter.notifyDataSetChanged();
}
else {
list.setAdapter(adapter);
}
}
}
private class Exercise
{
public String names;
public String decription;
public String category;
public String imagePath;
}
}

Just Change your onPostExecute method by below code.
#Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
Log.e("sss",s);
try {
arrayList=new ArrayList<>();
JSONArray array=new JSONArray(s);
for(int i=0;i<array.length();i++)
{
JSONObject object=array.getJSONObject(i);
Exercise exercise=new Exercise();
exercise.names=object.getString("name");
exercise.category=object.getString("category");
exercise.decription=object.getString("description");
arrayList.add(exercise);
}
dialog.dismiss();
} catch (JSONException e) {
e.printStackTrace();
}
Log.e("ss",""+first);
adapter = new AllExerciseAdapter(context,pos);
list.setAdapter(adapter);
/*if(!first)
{
adapter.notifyDataSetChanged();
}
else {
list.setAdapter(adapter);
}*/
}

You need to make a small change in your code -
if(!first) {
list.setAdapter(adapter);
adapter.notifyDataSetChanged(); // No needed to do for first time
}
else {
list.setAdapter(adapter); // Need to call only once.
adapter.notifyDataSetChanged();// Here you need to call it to reflect changes
}
One more change you need to do in onPostExecute -
try {
JSONArray array=new JSONArray(s);
arraList.clear(); //Add this line
for(int i=0;i<array.length();i++)
Hope it will help :)

This Line Is working for the code:-
adapter = new AllExerciseAdapter(context,arrayList);
adapter.setNotifyOnChange(true); // <-----
list.setAdapter(adapter);

Why is getAdapterPosition() being stuck on the first view clicked every (say) 5 seconds?

I have a RecyclerView class (QuestionCardAdapter) that presents all the items of a SpanishQuestionSet as CardViews.
Everything had been working fine (for instance i could make it so when a card was clicked, 'tick' and 'cross' buttons would come up and would remove the card when clicked)
However recently I wanted the clicking of the buttons (vCross or VTick) to modify an array which is a part of the SpanishQuestionSet (i.e. the item in the array would be +1 for wrong and -1 for right so that the descending quicksort i use will cause questions answered incorrectly to be at the top).
However, whenever I say click 4 consecutive cards as wrong, instead of each card's score being increased by 1, the first card of the 4's score is increased by 4. It seems like getAdapterPosition() is delayed. Could it be affected by a time limit variable I added so that the app wouldnt crash if someone double clicked a button before the card remove animation had completed?
Any help would be appreciated and I will present below the adapter and SpanishQuestionSet classes.
The adapter class is most likely the focus.
package com.alexgower.odin_spanishpack;
import android.content.Context;
import android.graphics.Color;
import android.os.SystemClock;
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 android.widget.Toast;
import java.io.FileNotFoundException;
import java.util.List;
public class QuestionCardAdapter extends RecyclerView.Adapter<QuestionCardAdapter.QuestionCardViewHolder> {
private final Context context;
protected List<QuestionCardInfo> questionCardList;
private long mLastClickTime = 0;
private SpanishQuestionSet questionSet;
private int positionClicked;
private void setPositionClicked(int i){
this.positionClicked =i;
}
private int getPositionClicked(){
return this.positionClicked;
}
public QuestionCardAdapter(Context contextIn, List<QuestionCardInfo> questionCardList, SpanishQuestionSet questionSetIn) {
this.questionCardList = questionCardList;
this.context = contextIn;
this.questionSet = questionSetIn;
}
#Override
public int getItemCount() {
return questionCardList.size();
}
#Override
public void onBindViewHolder(QuestionCardViewHolder questionCardViewHolder, int i) {
QuestionCardInfo ci = questionCardList.get(i);
questionCardViewHolder.vQuestionAnswer.setText(String.valueOf(ci.score) + ci.question);
questionCardViewHolder.answer = ci.answer;
questionCardViewHolder.vTick.setVisibility(View.INVISIBLE);
questionCardViewHolder.vCross.setVisibility(View.INVISIBLE);
questionCardViewHolder.vColorTV.setBackgroundColor(questionSet.getColourForScore(context,ci.score));
}
#Override
public QuestionCardViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View itemView = LayoutInflater.
from(viewGroup.getContext()).
inflate(R.layout.question_card_layout, viewGroup, false);
return new QuestionCardViewHolder(itemView);
}
public class QuestionCardViewHolder extends RecyclerView.ViewHolder {
public View view;
protected TextView vQuestionAnswer;
protected TextView vColorTV;
protected ImageView vTick;
protected ImageView vCross;
protected String answer = "Error";
public QuestionCardViewHolder(View v) {
super(v);
vColorTV = (TextView) v.findViewById(R.id.forNowColourTextView);
vQuestionAnswer = (TextView) v.findViewById(R.id.questionAnswerTextView);
vTick = (ImageView) v.findViewById(R.id.tickImage);
vCross = (ImageView) v.findViewById(R.id.crossImage);
view = v;
view.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
vQuestionAnswer.setText(answer);
vTick.setVisibility(View.VISIBLE);
vCross.setVisibility(View.VISIBLE);
setPositionClicked(getAdapterPosition());
}
});
view = vTick;
view.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (SystemClock.elapsedRealtime() - mLastClickTime > 1000) {
questionSet.questionRight(getPositionClicked(),context);
//questionSet.saveScores(context);
Toast.makeText(context, String.valueOf(questionSet.getScore(getPositionClicked())), Toast.LENGTH_LONG).show();
removeAt(getPositionClicked());
mLastClickTime = SystemClock.elapsedRealtime();
}
}
});
view = vCross;
view.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (SystemClock.elapsedRealtime() - mLastClickTime > 1000) {
questionSet.questionWrong(getPositionClicked(),context);
Toast.makeText(context, String.valueOf(questionSet.getScore(getPositionClicked())), Toast.LENGTH_LONG).show();
removeAt(getPositionClicked());
mLastClickTime = SystemClock.elapsedRealtime();
}
}
});
}
}
public void testContext(int position) {
questionSet.testFile(position, context);
//String name = questionSet.getQuestion(position);
//try {
// context.openFileOutput("a.txt", Context.MODE_PRIVATE);
// Toast.makeText(context, name, Toast.LENGTH_SHORT).show();
//}catch(FileNotFoundException e){
// Toast.makeText(context, e.getMessage(), Toast.LENGTH_SHORT).show();
//}
}
public void removeAt(int position) {
questionCardList.remove(position);
notifyItemRemoved(position);
notifyItemRangeChanged(position, questionCardList.size());
}
SpanishQuestionSet class
package com.alexgower.odin_spanishpack;
import android.content.Context;
import android.graphics.Color;
import android.os.SystemClock;
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 android.widget.Toast;
import java.io.FileNotFoundException;
import java.util.List;
public class QuestionCardAdapter extends RecyclerView.Adapter<QuestionCardAdapter.QuestionCardViewHolder> {
private final Context context;
protected List<QuestionCardInfo> questionCardList;
private long mLastClickTime = 0;
private SpanishQuestionSet questionSet;
private int positionClicked;
private void setPositionClicked(int i){
this.positionClicked =i;
}
private int getPositionClicked(){
return this.positionClicked;
}
public QuestionCardAdapter(Context contextIn, List<QuestionCardInfo> questionCardList, SpanishQuestionSet questionSetIn) {
this.questionCardList = questionCardList;
this.context = contextIn;
this.questionSet = questionSetIn;
}
#Override
public int getItemCount() {
return questionCardList.size();
}
#Override
public void onBindViewHolder(QuestionCardViewHolder questionCardViewHolder, int i) {
QuestionCardInfo ci = questionCardList.get(i);
questionCardViewHolder.vQuestionAnswer.setText(String.valueOf(ci.score) + ci.question);
questionCardViewHolder.answer = ci.answer;
questionCardViewHolder.vTick.setVisibility(View.INVISIBLE);
questionCardViewHolder.vCross.setVisibility(View.INVISIBLE);
questionCardViewHolder.vColorTV.setBackgroundColor(questionSet.getColourForScore(context,ci.score));
}
#Override
public QuestionCardViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View itemView = LayoutInflater.
from(viewGroup.getContext()).
inflate(R.layout.question_card_layout, viewGroup, false);
return new QuestionCardViewHolder(itemView);
}
public class QuestionCardViewHolder extends RecyclerView.ViewHolder {
public View view;
protected TextView vQuestionAnswer;
protected TextView vColorTV;
protected ImageView vTick;
protected ImageView vCross;
protected String answer = "Error";
public QuestionCardViewHolder(View v) {
super(v);
vColorTV = (TextView) v.findViewById(R.id.forNowColourTextView);
vQuestionAnswer = (TextView) v.findViewById(R.id.questionAnswerTextView);
vTick = (ImageView) v.findViewById(R.id.tickImage);
vCross = (ImageView) v.findViewById(R.id.crossImage);
view = v;
view.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
vQuestionAnswer.setText(answer);
vTick.setVisibility(View.VISIBLE);
vCross.setVisibility(View.VISIBLE);
setPositionClicked(getAdapterPosition());
}
});
view = vTick;
view.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (SystemClock.elapsedRealtime() - mLastClickTime > 1000) {
questionSet.questionRight(getPositionClicked(),context);
//questionSet.saveScores(context);
Toast.makeText(context, String.valueOf(questionSet.getScore(getPositionClicked())), Toast.LENGTH_LONG).show();
removeAt(getPositionClicked());
mLastClickTime = SystemClock.elapsedRealtime();
}
}
});
view = vCross;
view.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (SystemClock.elapsedRealtime() - mLastClickTime > 1000) {
questionSet.questionWrong(getPositionClicked(),context);
Toast.makeText(context, String.valueOf(questionSet.getScore(getPositionClicked())), Toast.LENGTH_LONG).show();
removeAt(getPositionClicked());
mLastClickTime = SystemClock.elapsedRealtime();
}
}
});
}
}
public void testContext(int position) {
questionSet.testFile(position, context);
//String name = questionSet.getQuestion(position);
//try {
// context.openFileOutput("a.txt", Context.MODE_PRIVATE);
// Toast.makeText(context, name, Toast.LENGTH_SHORT).show();
//}catch(FileNotFoundException e){
// Toast.makeText(context, e.getMessage(), Toast.LENGTH_SHORT).show();
//}
}
public void removeAt(int position) {
questionCardList.remove(position);
notifyItemRemoved(position);
notifyItemRangeChanged(position, questionCardList.size());
}
}

Turns out it is quite easy. For anyone in the future with a similar problem, note that getAdapterView() simply returns the integer of a views position in the viewholder so when a view is removed, the next view takes its position.
i.e. if you have views 1,2,3,4,5. When you remove 2, 3 becomes 2 and 4 becomes 3 etc. Alternative explanation: whichever is the 5th view on the screen will have position 5, even if 10000 other items before it have been removed (it will not be position 10005).
So it was not a problem with getAdapterPostion(). To fix the problem I used a variable for an itemID for each view in the recyclerview and did not use getAdapterPosition() except for in the removeAt() method.

We Keep Coding

Java is a programming language and computing platform first released by Sun Microsystems in 1995.

Execution Failed for task :app:compileDebugJavaWithJavac and error ';' expected - java

if (Build.VERSION.SDK_INT==Build.VERSION_CODES.LOLLIPOP) try this

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