Ndtyjky

I am trying to call moveCamera and my App is crashing. I am receiving a latlng from an Intent extra. I know the extra is coming throungh because I print it updates an edittext. I have tried entering different coordinates myself and nothingis working. Here is my error

 E/AndroidRuntime: FATAL EXCEPTION: main

Process: com.example.mmitm, PID: 28348

java.lang.RuntimeException: Unable to resume activity {com.example.mmitm/com.example.mmitm.MapActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.gms.maps.GoogleMap.moveCamera(com.google.android.gms.maps.CameraUpdate)' on a null object reference

    at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3645)

    at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3685)

    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2898)

    at android.app.ActivityThread.-wrap11(Unknown Source:0)

    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)

    at android.os.Handler.dispatchMessage(Handler.java:105)

    at android.os.Looper.loop(Looper.java:164)

    at android.app.ActivityThread.main(ActivityThread.java:6541)

    at java.lang.reflect.Method.invoke(Native Method)

    at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)

    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)

 Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.gms.maps.GoogleMap.moveCamera(com.google.android.gms.maps.CameraUpdate)' on a null object reference

    at com.example.mmitm.MapActivity.receiveData(MapActivity.java:136)

    at com.example.mmitm.MapActivity.onResume(MapActivity.java:111)

    at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1354)

    at android.app.Activity.performResume(Activity.java:7079)

    at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3620)

    at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3685) 

    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2898) 

    at android.app.ActivityThread.-wrap11(Unknown Source:0) 

    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593) 

    at android.os.Handler.dispatchMessage(Handler.java:105) 

    at android.os.Looper.loop(Looper.java:164) 

    at android.app.ActivityThread.main(ActivityThread.java:6541) 

    at java.lang.reflect.Method.invoke(Native Method) 

    at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240) 

    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767) 

And here is my map activity where I call the movecamera

//onResume Method check which fragment intent is sent from

@Override

protected void onResume() {

    super.onResume();



    //make sure extras are not null

    Bundle extras = getIntent().getExtras();

    if (extras != null) {

        this.receiveData();

        Toast.makeText(this, "Received Data", Toast.LENGTH_SHORT).show();



    }

}



private void receiveData() {

    //RECEIVE DATA VIA INTENT

    Intent i = getIntent();



    if(i != null)

    {

        LatLng locationOne = i.getParcelableExtra("LOC_ONE");

        LatLng locationTwo = i.getParcelableExtra("LOC_TWO");



        Toast.makeText(this, "LocOne = " + locationOne + ", LocTwo = " + locationTwo, Toast.LENGTH_LONG).show();

        //SET DATA TO TEXTVIEWS

        locOne.setText(locationOne.toString());

        locTwo.setText(locationTwo.toString());

        // move camera to location one

        Log.d(TAG, "receiveData: calling moveCamera");







        //Map Crashes when trying to move camera

        mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(locationOne,15));

    }

}

And my MoveCamera function

private void moveCamera(LatLng latLng, float zoom){

    Log.d(TAG, "moveCamera: moving the camera to: lat: " + latLng.latitude + ", lng: " + latLng.longitude );

    mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng, zoom));

}

This is my first android app so any help is appreciated!

it obviously crashes, because mMap is NULL.

if(this.getIntent() != null && mMap != null) {

    ...

}

just had a closer look; you need to handle the intent onMapReady():

@Override

public void onMapReady(GoogleMap map) {



    this.mMap = map;



    if(this.getIntent() != null && this.getIntent().getAction() == INTENT_ACTION_LOCATION_SELECT) {

        /* your code goes here */

    } else {

        /* regular initialization */

    }

}

where onResume() would possibly need to obtain the map from the SupportMapFragment.

You're calling moveCamera inside the function itself besides why do you need your own function when there is a built in function to do so. mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(place.getLatLng(), 15.0f));