在我的应用程序中,连接到locationservices.api后,在onconnected()回调中,我启动了一个位置更新请求,问题是处理进程的活动(dataactivity)无法识别为locationlistener的实例,它显示一个错误,并建议强制转换。

protected void startLocationUpdates() {
    PendingResult locationUpdatesResult = LocationServices.FusedLocationApi.requestLocationUpdates(locationGoogleApiClient, locationRequest, (com.google.android.gms.location.LocationListener) this);
}

当我将最后一个参数转换为(com.google.android.gms.location.locationListener)时,IDE允许我编译,但是抛出了一个ClassCastException
java.lang.ClassCastException:com.example。[…].dataactivity不能转换为com.google.android.gms.location.locationListener
我真的不知道为什么会这样。
这是这个班的声明。
public class DataActivity extends FragmentActivity implements LocationListener, ConnectionCallbacks , OnConnectionFailedListener, OnMapReadyCallback{

oncreate():
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_data);

    //Create the GoogleLocationAPI reference
    buildGoogleLocationApiClient();

    //Create Location Request
    createLocationRequest();

    //Initialize the mapFragment
    initializeMapFragment();

    updateUI();
}

其他方法:
protected synchronized void buildGoogleLocationApiClient(){
    locationGoogleApiClient = new GoogleApiClient.Builder(this)
            .addApi(LocationServices.API)
            .addConnectionCallbacks(this)
            .addOnConnectionFailedListener(this)
            .build();
    locationGoogleApiClient.connect();
    Log.v("**INFO: ", "API CLIENT");
}

protected static void createLocationRequest() {
    locationRequest = new LocationRequest();
    locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
    locationRequest.setInterval(10000);
    locationRequest.setFastestInterval(5000);
    Log.i("**INFO: ", "LocationRequest created");
}

protected void initializeMapFragment(){
    //Initialize the mapFragment
    mapFragment = (MapFragment) getFragmentManager().findFragmentById(R.id.map);
    //When mapFragment is ready...
    mapFragment.getMapAsync(this);
}

所以当建立连接(onconnected)时,当错误弹出时,我调用这个方法。
protected void startLocationUpdates() {
    PendingResult locationUpdatesResult = LocationServices.FusedLocationApi.requestLocationUpdates(locationGoogleApiClient, locationRequest, this);
    locationUpdatesResult.await();
}

最佳答案

确保DataActivity实现com.google.android.gms.location.LocationListener而不是android.location.LocationListener
您可能错误地导入了android.location.LocationListener

10-08 17:51