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 Activity (DataActivity) 未被识别为 LocationListener 的实例，它显示了一个错误，并建议铸造。
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，但抛出 ClassCastException
java.lang.ClassCastException: com.example.[...].DataActivity 无法转换为 com.google.android.gms.location.LocationListener
我真的不知道为什么会这样。
这是班级宣言。
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);
}
因此，当建立连接（OnConnected）时，我会在错误弹出时调用此方法。
protected void startLocationUpdates() {
PendingResult locationUpdatesResult = LocationServices.FusedLocationApi.requestLocationUpdates(locationGoogleApiClient, locationRequest, this);
locationUpdatesResult.await();
}