Google Maps Android LatLngBounds

Question

我使用以下代碼在我添加標記後縮放到地圖上的最大縮放級別。它可以工作，但只有在500毫秒內可以運行。如果它拿出來，它不起作用。我知道我錯過了一些明顯的東西，但我不知道我錯過了什麼。任何人都可以告訴我，我需要將LatLngBounds代碼放在沒有Runnable的地方嗎？

// Expand our Zoom to fit all markers 
     LatLngBounds.Builder builder = new LatLngBounds.Builder(); 

     //the include method will calculate the min and max bound. 
     builder.include(myLocationPin.getPosition()); 
     builder.include(placeLocationPin.getPosition()); 

     final LatLngBounds bounds = builder.build(); 

     final int zoomWidth = getResources().getDisplayMetrics().widthPixels; 
     final int zoomHeight = getResources().getDisplayMetrics().heightPixels; 
     final int zoomPadding = (int) (zoomWidth * 0.10); // offset from edges of the map 12% of screen 

     final Handler handler = new Handler(); 
     handler.postDelayed(new Runnable() { 
      @Override 
      public void run() { 
       map.animateCamera(CameraUpdateFactory.newLatLngBounds(bounds,zoomWidth,zoomHeight,zoomPadding)); 
      } 
     }, 500); 

Answer 1

@Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_view_map); 

     map = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)) 
       .getMap(); 

     map.setOnMapLoadedCallback(new GoogleMap.OnMapLoadedCallback() { 
      @Override 
      public void onMapLoaded() { 
       map.addMarker(new MarkerOptions().title("your title") 
         .snippet("your desc") 
         .position(new LatLng(-22.2323,-2.32323))); 
       map.animateCamera(CameraUpdateFactory.newLatLngBounds(bounds,zoomWidth, 
                   zoomHeight,zoomPadding)); 
      } 
     }); 
    } 

Answer 2

你可能需要等待地圖加載回調之前，你可以放大它：

@Override 
public void onMapLoaded() { 
if (mMap != null) { 
map.animateCamera(CameraUpdateFactory.newLatLngBounds(bounds,zoomWidth,zoomHeight,zoomPadding)); }} 

Answer 3

你需要得到地圖上立即顯示：

mMapView.onResume();