Created an application that implements a fragment with Google maps

Code in Main_Activity

private void createMapView() { /** * Catch the null pointer exception that * may be thrown when initialising the map */ try { if (null == googleMap) { googleMap = ((MapFragment) getFragmentManager().findFragmentById( R.id.mapView)).getMap(); /** * If the map is still null after attempted initialisation, * show an error to the user */ if (null == googleMap) { Toast.makeText(getApplicationContext(), "Error creating map", Toast.LENGTH_SHORT).show(); } } } catch (NullPointerException exception){} }

XML Code

  <fragment android:name="com.google.android.gms.maps.MapFragment" android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/mapView" />

When you start the program, everything works, but when I switch to another layout, and then back to layout with a map, the application closes in because of such errors:

 java.lang.IllegalStateException: Could not execute method of the activity android.view.InflateException: Binary XML file line #114: Error inflating class fragment java.lang.IllegalArgumentException: Binary XML file line #114: Duplicate id 0x7f0d0082, tag null, or parent id 0xffffffff with another fragment for com.google.android.gms.maps.MapFragment

In this case, the errors highlighted in blue indicate a line including the layout

 setContentView(R.layout.activity_main);

Anyone know how to handle?

* Addition: The createMepView () method is called in 2 places: at the very beginning

 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); tvEnabledGPS = (TextView) findViewById(R.id.tvEnabledGPS); tvLocationGPS = (TextView) findViewById(R.id.tvLocationGPS); tvEnabledNet = (TextView) findViewById(R.id.tvEnabledNet); tvLocationNet = (TextView) findViewById(R.id.tvLocationNet); locationManager = (LocationManager) getSystemService(LOCATION_SERVICE); createMapView(); addMarker(); }

and when returning to this layout

 public void bgot (View view){ setContentView(R.layout.activity_main); tvEnabledGPS = (TextView) findViewById(R.id.tvEnabledGPS); tvLocationGPS = (TextView) findViewById(R.id.tvLocationGPS); tvEnabledNet = (TextView) findViewById(R.id.tvEnabledNet); tvLocationNet = (TextView) findViewById(R.id.tvLocationNet); Plt = (TextView) findViewById(R.id.Plt); locationManager = (LocationManager) getSystemService(LOCATION_SERVICE); createMapView(); addMarker();
  • show the Activation code in which you have implemented the call to the createMapView () method - ZigZag
  • Added codes to the question, where createMapView () is called - WhiteJ0ker
  • one
    What does it mean when returning to layout? setContentView should only be called in one place. and only onCreate - Android Android
  • Instead of creating several Activations, it’s not the first time I’m switching between different layouts. But only with the card such an error occurred - WhiteJ0ker
  • one
    what you do with setContentView() is a gross violation of the application architecture and there is no sense in resolving this issue, since the mistake is already in the fact that initially unacceptable practices are used. Do as it should be - one activit (fragment) - one layout and everything will work, otherwise you should deal with such a terrible crutch yourself. This practice has no place at all on SoF.ru - pavlofff

1 answer 1

It seems that the fact is that the MapView is saved during the switch back and forth between layouts, and this behavior leads to the creation of a duplicate MapView that will be created with each new MapFragment with the same ID.

The solution is to manually remove the MapFragment :

 @Override public void onDestroyView() { super.onDestroyView(); MapFragment f = (MapFragment) getFragmentManager() .findFragmentById(R.id.mapView); if (f != null) getFragmentManager().beginTransaction().remove(f).commit(); }