Google 地图 Android API v2 检测地图上的长按并添加标记不起作用

我想长按在地图上添加标记。

Toast in onMapClick()通过正常点击即可显示。但长按不起作用。Toast in onMapLongClick()长按不显示。地图上也不显示标记。

我在用着SupportMapFragment因为我想在 Android 2.x 设备上使用我的应用程序。我已经在 Android 版本 2.3.7 的 Nexus One 上测试了我的应用程序。

这是我的代码。

public class MainActivity extends FragmentActivity implements
        OnMapClickListener, OnMapLongClickListener {

    final int RQS_GooglePlayServices = 1;
    private GoogleMap myMap;

    Location myLocation;

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

        FragmentManager myFragmentManager = getSupportFragmentManager();
        SupportMapFragment mySupportMapFragment = (SupportMapFragment) myFragmentManager
                .findFragmentById(R.id.map);
        myMap = mySupportMapFragment.getMap();

        myMap.setMyLocationEnabled(true);

        myMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
        // myMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
        // myMap.setMapType(GoogleMap.MAP_TYPE_SATELLITE);
        // myMap.setMapType(GoogleMap.MAP_TYPE_TERRAIN);

        myMap.setOnMapClickListener(this);
        myMap.setOnMapLongClickListener(this);

    }

    @Override
    protected void onResume() {
        super.onResume();

        int resultCode = GooglePlayServicesUtil
                .isGooglePlayServicesAvailable(getApplicationContext());

        if (resultCode == ConnectionResult.SUCCESS) {
            Toast.makeText(getApplicationContext(),
                    "isGooglePlayServicesAvailable SUCCESS", Toast.LENGTH_LONG)
                    .show();
        } else {
            GooglePlayServicesUtil.getErrorDialog(resultCode, this,
                    RQS_GooglePlayServices);
        }

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public void onMapClick(LatLng point) {

        myMap.animateCamera(CameraUpdateFactory.newLatLng(point));

        Toast.makeText(getApplicationContext(), point.toString(),
                Toast.LENGTH_LONG).show();


    }

    @Override
    public void onMapLongClick(LatLng point) {

        myMap.addMarker(new MarkerOptions().position(point).title(
                point.toString()));

        Toast.makeText(getApplicationContext(),
                "New marker added@" + point.toString(), Toast.LENGTH_LONG)
                .show();

    }

}

我该如何解决这个问题？

我用过这个。有效。

GoogleMap gm;

gm.setOnMapLongClickListener(this); 

@Override    
public void onMapLongClick(LatLng point) {
    gm.addMarker(new MarkerOptions()
        .position(point)
        .title("You are here")           
        .icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED)));  
}