android - 停止包含 LocationManager 的后台服务

Question

我使用 startService(intent) 从 MainActivity 启动我的后台服务，它将用户的位置发送到服务器。如果用户不希望通过单击菜单中的按钮来停止此服务(也停止从 onLocationChanged 方法触发数据的 requestLocationUpdates)。我已经尝试了 onOptionsItemSelected 方法中的代码，但当我单击按钮时它仍然有效。

我怎样才能停止这个服务？

主要 Activity :

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

    Intent i = new Intent(this, TrackingService.class);
    startService(i);

}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
    case R.id.disconnect_id:
        System.out.println("test onCreateOptionsMenu was invoked.");

        // Stop the service when the Menu button clicks.
        Intent i = new Intent(this, TrackingService.class);
        stopService(i);

        return true;

    default:
        return super.onOptionsItemSelected(item);
    }
}

跟踪服务类:

public class TrackingService extends Service {

 ....
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        // TODO Auto-generated method stub

        Toast.makeText(this, "Location Updation has started", Toast.LENGTH_LONG)
                .show();
        Log.v("X", "Response:in onStartCommand()");

        detectLocation();
        stopSelf();
        return START_STICKY;
    }

    private void detectLocation() {
        // TODO Auto-generated method stub
        Toast.makeText(this, "Inside detectlocation()", Toast.LENGTH_SHORT)
                .show();

        LocationManager lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
        LocationListener ll = new MyLocationListener(this);
        // location updates: at least 0 meter and 60 seconds change.
        lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 30 * 1000, 0,
                ll);

        Log.v("X", "Response:After lm1.requestLocationUpdates ");
        enableGPS(lm);

    }


}

Answer 1

它看起来像您现在的编码方式，您的服务实际上并没有做任何事情。

因为您已将您的 MyLocationListener 实例注册为 LocationListener，所以停止服务不会执行任何操作。

此外，由于您在 onStartCommand() 中调用了 stopSelf()，因此每次服务启动时您都会立即停止该服务。

我建议将服务设为 LocationListener，并且不要在 onStartCommand() 中调用 stopSelf().此外，覆盖服务中的 onDestroy()，并显式调用 removeUpdates() 以确保您的应用发布保持 GPS radio 处于 Activity 状态的请求。

像这样:

public class TrackingService extends Service implements LocationListener{

    LocationManager lm; //make instance variable

    //....
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        // TODO Auto-generated method stub

        Toast.makeText(this, "Location Updation has started", Toast.LENGTH_LONG)
                .show();
        Log.v("X", "Response:in onStartCommand()");

        detectLocation();
        //stopSelf(); //don't stop the service here
        return START_STICKY;
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        lm.removeUpdates(this);
    }

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }


    private void detectLocation() {
        // TODO Auto-generated method stub
        Toast.makeText(this, "Inside detectlocation()", Toast.LENGTH_SHORT)
                .show();

        lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
        //LocationListener ll = new MyLocationListener(this);

        // location updates: at least 0 meter and 60 seconds change.
        lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 30 * 1000, 0,
                this);

        Log.v("X", "Response:After lm1.requestLocationUpdates ");
        enableGPS(lm);

    }

    @Override
    public void onLocationChanged(Location location) {
        //put your location changed code here

    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {

    }

    @Override
    public void onProviderEnabled(String provider) {

    }

    @Override
    public void onProviderDisabled(String provider) {

    }

}