Ufdjrw

Im working on Geofences. i have creates google api client in my main activity and using the object of GoogleApiClient in another fragment. Now Im getting this exception and application getting crashed.

Here is the complete error details.

2019-03-07 20:01:56.197 10473-10473/com.example.foodtag E/UncaughtException: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.Context android.content.Context.getApplicationContext()' on a null object reference
 at android.content.ContextWrapper.getApplicationContext(ContextWrapper.java:109)
 at com.example.foodtag.MainActivity.getGeofencePendingIntent(MainActivity.java:184)
 at com.example.foodtag.CameraFragment.addFence(CameraFragment.java:228)
 at com.example.foodtag.CameraFragment.access$000(CameraFragment.java:72)
 at com.example.foodtag.CameraFragment$1.onClick(CameraFragment.java:163)

Here is my fragment class.

public class CameraFragment extends Fragment implements
 AdapterView.OnItemSelectedListener, ResultCallback {
 MainActivity help = new MainActivity();
 @Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) 
 View view = inflater.inflate(R.layout.fragment_camera, container, false);
 mStorageRef = FirebaseStorage.getInstance().getReference();
 ActivityCompat.requestPermissions((Activity) getContext(),
 new String[]Manifest.permission.CAMERA, 0);
 geofencingClient = LocationServices.getGeofencingClient(getContext());
 tag.setOnClickListener(new View.OnClickListener() 
 @Override
 public void onClick(View view) 


 help.populateGeofenceList(); // 
 Toast.makeText(getContext(), "populated", Toast.LENGTH_SHORT).show();



 addFence(); // error in this method
 

 );
 return view;

Here is the method definition:

private void addFence() 

 if (!MainActivity.mClient.isConnected()) 
 Toast.makeText(getContext(), "MClient Not connected", Toast.LENGTH_SHORT).show();
 return;
 
 try 
 if (ActivityCompat.checkSelfPermission((Activity)getContext(), Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) 
 // TODO: Consider calling
 // ActivityCompat#requestPermissions
 // here to request the missing permissions, and then overriding
 // public void onRequestPermissionsResult(int requestCode, String[] permissions,
 // int[] grantResults)
 // to handle the case where the user grants the permission. See the documentation
 // for ActivityCompat#requestPermissions for more details.

 ActivityCompat.requestPermissions((Activity)getContext(), new String[]android.Manifest.permission.ACCESS_FINE_LOCATION,
 android.Manifest.permission.ACCESS_COARSE_LOCATION, 101);
 return;
 
 LocationServices.GeofencingApi.addGeofences(MainActivity.mClient,
 help.getGeofencingRequest(), //error calling this method which is written in my main activity
 help.getGeofencePendingIntent()
 ).setResultCallback(this);

 catch (SecurityException securityException)
 Log.e(TAG,"security exception");
 

My main activity goes like this

 public class MainActivity extends AppCompatActivity implements
 AdapterView.OnItemSelectedListener, GoogleApiClient.ConnectionCallbacks,
 GoogleApiClient.OnConnectionFailedListener,
 LoaderManager.LoaderCallbacks<Cursor>, LocationListener 
 public static final int GEOFENCE_RADIUS = 250;


private static final String LOG_TAG = "MainActivity ";
private static final int MAX_LENGTH = 20;

public double latitude, longitude;
LocationManager locationManager;
public List<Geofence> mGeofenceList = new ArrayList<>();
public static GoogleApiClient mClient;
private Geofencing mGeofencing;
private boolean mIsEnabled;
private CheckBox mRingerPermissionCheckBox;
private static final int PLACE_PICKER_REQUEST = 109;

String Id;


@Override
protected void onCreate(Bundle savedInstanceState) 
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);

 if (SaveSharedPreference.getPassword(getApplicationContext()).length() == 0) 
 Intent i = new Intent(getApplicationContext(), Userlogin.class);
 startActivity(i);
 
 setupViewPager();

 locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
 if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) 
 ActivityCompat.requestPermissions((Activity)this,
 new String[]Manifest.permission.CAMERA,0);
 return;
 
 Location location = locationManager.getLastKnownLocation(locationManager.NETWORK_PROVIDER);

 onLocationChanged(location);

 // Toast.makeText(this, ""+longitude+latitude, Toast.LENGTH_LONG).show();

 buildGoogleApiClient();
 LocationManager locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);

 if (ContextCompat.checkSelfPermission(getApplicationContext(), android.Manifest.permission.ACCESS_FINE_LOCATION) !=
 PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getApplicationContext(), android.Manifest.permission.ACCESS_COARSE_LOCATION)
 != PackageManager.PERMISSION_GRANTED) 

 ActivityCompat.requestPermissions(this, new String[]android.Manifest.permission.ACCESS_FINE_LOCATION,
 android.Manifest.permission.ACCESS_COARSE_LOCATION, 101);

 //geofencingClient = LocationServices.getGeofencingClient(this);

 // Toast.makeText(this, ""+geofencingClient, Toast.LENGTH_LONG).show();

 


 public synchronized void buildGoogleApiClient() 
 mClient = new GoogleApiClient.Builder(getBaseContext())
 .addConnectionCallbacks(this)
 .addOnConnectionFailedListener(this)
 .addApi(LocationServices.API)
 .build();
 mClient.connect();
 mGeofencing = new Geofencing(mClient,this);
 Toast.makeText(this, ""+mClient, Toast.LENGTH_SHORT).show();



private void setupViewPager()
 SectionsPagerAdapter adapter = new SectionsPagerAdapter(getSupportFragmentManager());

 adapter.addFragment(new HomeFragment());
 adapter.addFragment(new CameraFragment());
 adapter.addFragment(new ProfileFragment());
 ViewPager viewPager = (ViewPager) findViewById(R.id.container);
 viewPager.setAdapter(adapter);

 final TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
 tabLayout.setupWithViewPager(viewPager);

 tabLayout.getTabAt(0).setIcon(R.drawable.ic_food);
 tabLayout.getTabAt(1).setIcon(R.drawable.ic_camera);
 tabLayout.getTabAt(2).setIcon(R.drawable.ic_account);
 /* tabLayout.setOnClickListener(new View.OnClickListener() 
 @Override
 public void onClick(View v) 
 switch()
 
 case 1:
 Intent i=new Intent( MediaStore.ACTION_IMAGE_CAPTURE);
 startActivityForResult(i,0);
 
 
 );*/


public static String random() 
 Random generator = new Random();
 StringBuilder randomStringBuilder = new StringBuilder();
 int randomLength = generator.nextInt(MAX_LENGTH);
 char tempChar;
 for (int i = 0; i < randomLength; i++)
 tempChar = (char) (generator.nextInt(96) + 32);
 randomStringBuilder.append(tempChar);
 
 return randomStringBuilder.toString();

public void populateGeofenceList()



 mGeofenceList.add(new Geofence.Builder()
 .setRequestId(random())
 .setCircularRegion(latitude,longitude,GEOFENCE_RADIUS)
 .setExpirationDuration(Geofence.NEVER_EXPIRE)
 .setTransitionTypes(Geofence.GEOFENCE_TRANSITION_ENTER)
 .build());
 Id = random();

 // Toast.makeText(this, ""+mGeofenceList, Toast.LENGTH_SHORT).show();


public GeofencingRequest getGeofencingRequest()
 GeofencingRequest.Builder builder = new GeofencingRequest.Builder();
 builder.setInitialTrigger(GeofencingRequest.INITIAL_TRIGGER_ENTER);
 builder.addGeofences(mGeofenceList);
 return builder.build();


public PendingIntent getGeofencePendingIntent()
 Intent intent = new Intent(this, GeofenceTransitionsIntentService.class);

 return PendingIntent.getService(this, 0, intent,PendingIntent.FLAG_UPDATE_CURRENT);




@NonNull
@Override
public Loader<Cursor> onCreateLoader(int i, @Nullable Bundle bundle) 
 return null;


@Override
public void onLoadFinished(@NonNull Loader<Cursor> loader, Cursor cursor) 



@Override
public void onLoaderReset(@NonNull Loader<Cursor> loader) 



@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) 



@Override
public void onNothingSelected(AdapterView<?> parent) 



@Override
public void onConnected(@Nullable Bundle bundle) 

 Log.i(LOG_TAG,"Api connection successful");
 // Toast.makeText(this , "onConnected", Toast.LENGTH_SHORT).show();




@Override
public void onConnectionSuspended(int i) 
 Log.i(LOG_TAG,"API Client connection suspended.");



@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) 

 Log.i(LOG_TAG,"API Connection client suspended.");
 Toast.makeText(this , "onConectionFailed", Toast.LENGTH_SHORT).show();



@Override
public void onResume() 
 super.onResume();

 buildGoogleApiClient();




@Override
public void onStop() 
 super.onStop();
 try 
 if (mClient.isConnecting() catch (NullPointerException n)
 Toast.makeText(this, ""+ n, Toast.LENGTH_SHORT).show();
 


@Override
public void onLocationChanged(Location location) 

 latitude=location.getLatitude();
 longitude = location.getLongitude();



@Override
public void onStatusChanged(String provider, int status, Bundle extras) 



@Override
public void onProviderEnabled(String provider) 



@Override
public void onProviderDisabled(String provider) 

PLEASE HELP ME !