android - 在服务中使用 GoogleApiClient

Question

我正在尝试获取服务中的位置更新信息。为此，我创建了一个服务，并在服务类的 onStartCommand 中创建了 GoogleApiClient，但我没有在服务中收到连接回调。请帮助解决这个问题。

下面给出的是服务代码，在 Activity 中我已经使用 startService 方法启动了服务:

startService(new Intent(this, LocationService.class));

服务代码

public class LocationService extends Service implements GoogleApiClient.ConnectionCallbacks,
                    GoogleApiClient.OnConnectionFailedListener, LocationListener {

private GoogleApiClient mLocationClient;

private Location mCurrentLocation;
LocationRequest mLocationRequest;

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    // TODO do something useful
    Toast.makeText(this, "onStartCommand", Toast.LENGTH_SHORT).show();
    mLocationClient = new GoogleApiClient.Builder(LocationService.this)
    .addApi(LocationServices.API).addConnectionCallbacks(LocationService.this)
    .addOnConnectionFailedListener(LocationService.this).build();

    mLocationRequest = new LocationRequest();
    mLocationRequest.setInterval(1000);
    mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);

    mLocationRequest.setFastestInterval(1000);
    return Service.START_NOT_STICKY;
}

@Override
public void onLocationChanged(Location location) {
    // TODO Auto-generated method stub
    mCurrentLocation = location;
    Toast.makeText(this, mCurrentLocation.getLatitude() +", "+ mCurrentLocation.getLatitude(), Toast.LENGTH_SHORT).show();
}

@Override
public void onConnectionFailed(ConnectionResult arg0) {
    // TODO Auto-generated method stub
    Toast.makeText(this, "Connection failed", Toast.LENGTH_SHORT).show();
}

@Override
public void onConnected(Bundle arg0) {
    // TODO Auto-generated method stub
    Toast.makeText(this, "Connected", Toast.LENGTH_SHORT).show();
    //if(servicesConnected()) {
        LocationServices.FusedLocationApi.requestLocationUpdates(mLocationClient, mLocationRequest, this);
    //}

}

@Override
public void onConnectionSuspended(int arg0) {
    // TODO Auto-generated method stub
    Toast.makeText(this, "Disconnected. Please re-connect.",
            Toast.LENGTH_SHORT).show();
}



@Override
public IBinder onBind(Intent intent) {
    // TODO Auto-generated method stub
    return null;
}

Answer 1

主要问题:您永远不会调用 mLocationClient.connect()因此连接过程永远不会开始。

此外，onStartService() 可以被调用多次(即，每次调用 startService() - 相反，您应该将其移动到 onCreate( ) 为您的 Service 确保它在您的服务生命周期内只被调用一次。同样，您应该在 onDestroy() 中使用 removeLocationUpdates() 并断开您的连接mLocationClient.