通过放置标记来动画路径的方法

Question

我试图执行动画来模拟地图上的路线，我必须显示带标记的路径，逐个放置，等待X时间放入下一个。首先，我使用线程等待放置下一个标记，但它不会在任何设备上运行，并在运行时在地图上发生中断，因此会导致用户体验如此糟糕。然后，我决定使用animateCamera (Android API reference here)的回调功能来避免中断，但我无法找到某种方式相互制作动画，标记和位置的数量未确定，因此我必须重复。这是一些最后的想法代码：

hashMarkers.get("Initial").setVisible(true); 
     mMap.animateCamera(CameraUpdateFactory.zoomTo(16), 5000, new GoogleMap.CancelableCallback() { 
      @Override 
      public void onFinish() { 
       for (COUNT=1; COUNT < hashMarkers.size() - 1;){ 
        CameraPosition cameraPosition = new CameraPosition.Builder() 
          .target(hashMarkers.get(String.valueOf(COUNT)).getPosition()) // Sets the center of the map to 
          .zoom(16)     // Sets the zoom 
          .bearing(-bearing)    // Sets the orientation of the camera to east 
          .tilt(90)     // Sets the tilt of the camera to 30 degrees 
          .build();     // Creates a CameraPosition from the builder 
        hashMarkers.get(String.valueOf(COUNT)).setVisible(true); 
        mMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition), 3000, new GoogleMap.CancelableCallback() { 
         @Override 
         public void onFinish() { 
          COUNT++; 
         } 

         @Override 
         public void onCancel() { 

         } 
        }); 

此代码只显示初始标记和散列表中的第一个标记。

非常感谢您的任何贡献，可能有助于解决此问题！

Answer 1

我找到了解决方案，创建了可取消的回调，它对我有用，并可能对其他人有所帮助。

mMap.animateCamera(CameraUpdateFactory.zoomTo(16), 5000, new GoogleMap.CancelableCallback() { 
     @Override 
     public void onFinish() { 
      mMap.animateCamera(CameraUpdateFactory.zoomTo(16), 3000, myCallBack); 
     } 

     @Override 
     public void onCancel() { 

     } 
    }); 
} 

GoogleMap.CancelableCallback myCallBack = new GoogleMap.CancelableCallback() { 
@Override 
public void onFinish() { 
    if(++COUNT < hashMarkers.size()){ 

     CameraPosition cameraPosition = 
       new CameraPosition.Builder() 
         .target(hashMarkers.get(String.valueOf(COUNT)).getPosition()) 
         .tilt(90) 
         .bearing(-bearing) 
         .zoom(16) 
         .build(); 

     hashMarkers.get(String.valueOf(COUNT)).setVisible(true); 

     mMap.animateCamera(
       CameraUpdateFactory.newCameraPosition(cameraPosition), 
       3000, 
       COUNT == hashMarkers.size() - 1 ? FinalCancelableCallback : myCallBack); 
    } 
} 

@Override 
public void onCancel() { 
} 
}; 

GoogleMap.CancelableCallback FinalCancelableCallback =新GoogleMap.CancelableCallback（）{

@Override 
public void onFinish() { 

    CameraPosition cameraPosition2 = new CameraPosition.Builder() 
      .target(hashMarkers.get("Final").getPosition()) // Sets the center of the map to 
      .zoom(17)     // Sets the zoom 
      .bearing(-bearing)    // Sets the orientation of the camera to east 
      .tilt(90)     // Sets the tilt of the camera to 30 degrees 
      .build();     // Creates a CameraPosition from the builder 
    hashMarkers.get("Final").setVisible(true); 
    mMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition2), 3000, new GoogleMap.CancelableCallback() { 
     @Override 
     public void onFinish() { 
      allView = new LatLngBounds(
        allLatLng.get(0), allLatLng.get(allLatLng.size() - 1)); 
      mMap.animateCamera(CameraUpdateFactory.newLatLngBounds(allView, 80), 2000, null); 
     } 

     @Override 
     public void onCancel() { 

     } 
    }); 

} 

@Override 
public void onCancel() { 
} 

};