永远不会调用GoogleMaps.oncameraChangedListener [英] GoogleMaps.oncameraChangedListener is never called

问题描述

我有一个实现GoogleMap.onCameraChangedListener的Activity(会放大地图片段)，并且我已经覆盖了onCameraChange方法.

I have an Activity (which inflates a map fragment) which implements the GoogleMap.onCameraChangedListener, and I have overriden the onCameraChange method.

问题是，每当我在地图上移动时，即相机位置发生变化，就永远不会调用onCameraChange方法.

The problem is that whenever I move across the map, i.e. the camera position changes, the onCameraChange method is never called.

这可能是什么原因造成的?

What could be causing this?

推荐答案

尝试一下:

 public class MapActivity extends AppCompatActivity implements
    GoogleMap.OnCameraChangeListener{
    private GoogleMap googleMap;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.googlemap_layout);
        setUpMapIfNeeded();

     }

@Override
public void onCameraChange(CameraPosition cameraPosition) {
    double latitude = cameraPosition.target.latitude;
    double longitude = cameraPosition.target.longitude;

}
private void setUpMapIfNeeded() {

    if (googleMap == null) {
        // Try to obtain the map from the SupportMapFragment.
        googleMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap();
        if (googleMap != null) {

            googleMap.setMyLocationEnabled(true);
            googleMap.getUiSettings().setMyLocationButtonEnabled(true);
            googleMap.getUiSettings().setRotateGesturesEnabled(false);
            googleMap.getUiSettings().setZoomControlsEnabled(false);
            googleMap.setOnCameraChangeListener(this);

        }
    }
}

}

布局:

 <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">

<fragment
    android:id="@+id/map"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    class="com.google.android.gms.maps.SupportMapFragment" />
</RelativeLayout>

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