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[教学] Android MapFragment.getMap()' on a null object reference

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发表于 2015-7-17 20:47:20 | 显示全部楼层 |阅读模式
java.lang.NullPointerException: Attempt to invoke virtual method 'com.google.android.gms.maps.GoogleMap com.google.android.gms.maps.MapFragment.getMap()' on a null object reference

ClassLoader.loadClass: The class loader returned by Thread.getContextClassLoader() may fail for processes that host multiple applications. You should explicitly specify a context class loader. For example: Thread.setContextClassLoader(getClass().getClassLoader());

Solution 解决方案

  1. MapFragment mapFragment = (MapFragment) getChildFragmentManager().findFragmentById(R.id.mapView);

  2. if(mapFragment == null){
  3.     return;
  4. }

  5. googleMap = mapFragment.getMap();
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