Android 无法对supportMapFragment执行操作

我为此苦苦挣扎了几个小时，所以我最终决定需要一些帮助

我在一个ViewPager中有一个SupportMapFragment（Google Map v2），ViewPager本身在一个TabFragment中。这不是一个美丽的景象，但它不是一个用于发布的应用程序。它更像是我正在开发的未来应用程序的概念证明

所以，结构看起来像这样：

主要活动：

• 表1
  • 表1视图页面片段1

    com.google.android.gms.maps.GoogleMap@476b528 (for example)
    

    Marker marker = mMap.addMarker(new MarkerOptions().position(new LatLng(latitude, longitude)));
    

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        Log.d(TAG, "onViewCreated");
        SupportMapFragment supportMapFragment = 
                             (SupportMapFragment) GameFragment.mGamePagerAdapter.getRegisteredFragment(0);
    
        if (supportMapFragment == null) {
            Log.d(TAG, "onViewCreated > supportMapFragment == null");
            mMap = null;
        } else {
            Log.d(TAG, "onViewCreated > supportMapFragment != null > supportMapFragmentToString: " + supportMapFragment.toString());
            mMap = supportMapFragment.getMap();
        }
    
    
        if (mMap == null) {
            Log.d(TAG, "onViewCreated > mMap == null");
        } else {
            Log.d(TAG, "onViewCreated > mMap != null > mMap: " + mMap.toString());
    
            if (savedInstanceState == null) {
                Log.d(TAG, "onViewCreated > savedInstanceState == null");
    
                CameraUpdate center = CameraUpdateFactory.newLatLng(new LatLng(51.2, 4.5));
                CameraUpdate zoom = CameraUpdateFactory.zoomTo(15);
    
                mMap.moveCamera(center);
                mMap.animateCamera(zoom);
                mMap.getUiSettings().setZoomControlsEnabled(false);
    
                Marker marker = mMap.addMarker(new MarkerOptions().position(new LatLng(latitude, longitude)));
                if (marker == null) {
                    Log.d(TAG, "onViewCreated > savedInstanceState == null > marker == null");
                } else {
                    Log.d(TAG, "onViewCreated > savedInstanceState == null > marker != null");
                    LatLng location = marker.getPosition();
                    Log.d(TAG, "onViewCreated > savedInstanceState == null > marker != null > MarkerToString: " + marker.toString());
                    Log.d(TAG, "onViewCreated > savedInstanceState == null > marker != null > Marker Latidude: " + location.latitude);
                    Log.d(TAG, "onViewCreated > savedInstanceState == null > marker != null > Marker Longitude: " + location.longitude);
                    Log.d(TAG, "onViewCreated > savedInstanceState == null > marker != null > Camera Position: " + mMap.getCameraPosition().toString());
                }
            }
    
        }
        super.onViewCreated(view, savedInstanceState);
    }
    

    public Fragment getRegisteredFragment (int position) {
        return registeredFragments.get(position);
    }
    

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        Fragment fragment = (Fragment) super.instantiateItem(container, position);
        registeredFragments.put(position, fragment);
        return fragment;        
    }