移动地图时如何更新标记？

Question

我正在使用Algolia的InstantSearch Android库.

这是我的查询:

searcher.setQuery(new Query().setAroundLatLngViaIP(true).setAroundRadius(5000)).

但是当我移动地图时,标记会保留在原位.移动地图位置视图时,如何在地图上显示新标记？

Answer 1

所以基本上你想监听地图的变化以及每次用户拖动地图并重新加载结果时？这是你应该做的：

public class AwesomeCameraActivity extends FragmentActivity implements
        OnCameraIdleListener,
        OnMapReadyCallback {

    private GoogleMap mMap;

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

        SupportMapFragment mapFragment =
            (SupportMapFragment) getSupportFragmentManager()
                    .findFragmentById(R.id.map);
        mapFragment.getMapAsync(this);
    }

    @Override
    public void onMapReady(GoogleMap map) {
        mMap = map;

        mMap.setOnCameraIdleListener(this);

        // Show the initial position
        mMap.moveCamera(CameraUpdateFactory
                .newLatLngZoom(new LatLng(YOUR_LATITUDE, YOUR_LONGITUDE), 10));
    }

    @Override
    public void onCameraIdle() {
        // The camera / map stopped moving, now you can fetch the center of the map
        GeoPoint center = mMap.getProjection().fromPixels(mMap.getHeight() / 2, mMap.getWidth() / 2);
        double centerLat = (double)center.getLatitudeE6() / (double)1E6;
        double centerLng = (double)center.getLongitudeE6() / (double)1E6;

        // Now fire a new search with the new latitude and longitude
        searcher.setQuery(new Query().setAroundLatLng(new AbstractQuery.LatLng(centerLat, centerLng)).setAroundRadius(5000))
    }
}