Myujth

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));