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Unable to Resume Activity: Null Pointer Exception on button click


Unable to Resume Activity: Null Pointer Exception on button click

By : Dawn Brendle Jackson
Date : November 22 2020, 02:42 PM
it fixes the issue In InsertActivity, studentDBoperation is not initialised and hence you might be getting NPE. Also, you should override onCreate() and setContentView() just like you have in MainActivity.
code :


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Unable to start activity: null pointer exception

Unable to start activity: null pointer exception


By : Vilmantas JC
Date : March 29 2020, 07:55 AM
Hope this helps I am encountering this problem because the views I am trying to access are contained in a separate fragment xml file. I have asked a separate question about how to do this here. for your responses guys.
BroadCast Reveiver IS counting power button click, but UNABLE to RESUME a minimized activity

BroadCast Reveiver IS counting power button click, but UNABLE to RESUME a minimized activity


By : L.H.Straathof
Date : March 29 2020, 07:55 AM
seems to work fine In this code : , MyReceiver.java
code :
public class MyReceiver extends BroadcastReceiver 
{
    private static int countPowerOff = 0;

    public MyReceiver ()
    {

    }

    @Override
    public void onReceive(Context context, Intent intent)
    {
        if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF))
        {    
            Log.e("In on receive", "In Method:  ACTION_SCREEN_OFF");
            countPowerOff++;
        }
        else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON))
        {
            Log.e("In on receive", "In Method:  ACTION_SCREEN_ON");
        }
        else if(intent.getAction().equals(Intent.ACTION_USER_PRESENT))
        {
            Log.e("In on receive", "In Method:  ACTION_USER_PRESENT");
            if (countPowerOff > 2)
            {
                countPowerOff=0;
                Toast.makeText(context, "MAIN ACTIVITY IS BEING CALLED ", Toast.LENGTH_LONG).show();
                Intent i = new Intent(context, MainActivity.class);
                i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK|Intent.FLAG_ACTIVITY_CLEAR_TOP);
                context.startActivity(i);
            }
        }
    }
}
public class MainActivity extends Activity 
{
    private MyReceiver myReceiver;

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

        IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
        filter.addAction(Intent.ACTION_SCREEN_OFF);
        filter.addAction(Intent.ACTION_USER_PRESENT);
        myReceiver = new MyReceiver();
        registerReceiver(myReceiver, filter);
    }

    @Override
    protected void onDestroy() 
    {
        if (myReceiver != null)
        {
            unregisterReceiver(myReceiver);
            myReceiver = null;
        }           
        super.onDestroy();
    }
}
unable to resume activity NULL POINTER EXCEPTION & Error inflating class fragment?

unable to resume activity NULL POINTER EXCEPTION & Error inflating class fragment?


By : ChrisB
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further i have found the solution for those two problems so the first one: 1-null pointer exception unable to resume activity it occurs when ever i change the phone orientation from landscape to portrait and the solution is to: remove -
code :
@Override
public void onPause() {
    // TODO Auto-generated method stub
    super.onPause();
    Fragment fragment = (getFragmentManager().findFragmentById(R.id.map));
    android.app.FragmentTransaction ft = getActivity().getFragmentManager()
            .beginTransaction();
    ft.remove(fragment);
    ft.commit();
}

@Override
public void onDestroyView() {

    super.onDestroyView();

    Fragment fragment = (getFragmentManager().findFragmentById(R.id.map));
    android.app.FragmentTransaction ft = getActivity().getFragmentManager()
            .beginTransaction();
    ft.remove(fragment);
    ft.commit();

}
    if(HomeFragment.googleMap != null){
    LocationManager locationManager = (LocationManager)getApplicationContext().getSystemService(Context.LOCATION_SERVICE);
    Criteria criteria = new Criteria();

    Location location = locationManager
            .getLastKnownLocation(locationManager.getBestProvider(criteria,
                    false));
    if (location != null) {
        HomeFragment.googleMap
                .animateCamera(CameraUpdateFactory.newLatLngZoom(
                        new LatLng(location.getLatitude(), location
                                .getLongitude()), 13));

        CameraPosition cameraPosition = new CameraPosition.Builder()
                .target(new LatLng(location.getLatitude(), location
                        .getLongitude())) // Sets the center of the map to
                                            // location user
                .zoom(14) // Sets the zoom
                .bearing(0) // Sets the orientation of the camera to east
                .tilt(40) // Sets the tilt of the camera to 30 degrees
                .build(); // Creates a CameraPosition from the builder
        HomeFragment.googleMap.animateCamera(CameraUpdateFactory
                .newCameraPosition(cameraPosition));

    }
}else{
            fragment = new HomeFragment();}
            mDrawerLayout.closeDrawers();
            break;
HomeFragment.googleMap = null;
Unable to resume Activity null pointer exception on Google map

Unable to resume Activity null pointer exception on Google map


By : rynx93
Date : March 29 2020, 07:55 AM
should help you out Its recommended to find all your views inside your onCreate method.
Also initialize the LocationManager
code :
    mMap = ((MapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap();
    txtDistance = (TextView) findViewById(R.id.txtSpeed);
    lm = (LocationManager) getSystemService(LOCATION_SERVICE);
    if (Utils.isConnected(getApplicationContext())) {

        lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER,0,0, this);
        location = lm.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);  

        startLatitude = location.getLatitude();
        startLongitude = location.getLongitude();

        start = new LatLng(startLatitude, startLongitude);

        //  lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 2000, 10, locationListener);

        new Routing(getParent(), mMap, txtDistance).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, start, end);
    }
Android- Null pointer exception from getStringExtra using intent send a value to another activity by button click

Android- Null pointer exception from getStringExtra using intent send a value to another activity by button click


By : Mohsen Mollayi
Date : March 29 2020, 07:55 AM
this will help I am facing the problem when I use Intent to send a value to another activity by click a button. I have tried to solve it in many ways but it always show NullPointerException although I declared it clearly. , UPDATE
code :
public class ShowCarPrice extends AppCompatActivity {

    // OK, Create the objects, variables here if needed
    Intent intent;
    String brand;

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

        // You should assign the intent here (in onCreate method)
        intent = getIntent();

        // Then, the string variable
        brand = intent.getStringExtra("brand");

        // You can also check whether or not received a valid value
        if (brand != null && !brand.isEmpty())
        // do something with brand value
        else
        // brand value is null or empty
    }
}
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