Question

我正在使用startService(intent)从MainActivity开始我的后台服务，该服务将用户的位置发送到服务器。我想让用户停止此服务（如果他不希望通过单击菜单中的按钮，则停止从onLocationChanged方法触发数据requestLocationUpdates）。我已经尝试了onOptionsItemSelected方法中的代码，但是当我点击按钮时它仍然有效。

如何停止此服务？

MainActivity：

    @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

看起来你现在编码的方式，你的服务并没有真正做任何事情。

因为您已将MyLocationListener实例注册为LocationListener，所以停止服务不会做任何事情。

此外，由于您在stopSelf()中致电onStartCommand()，因此您每次启动时都会立即停止服务。

我建议您将服务作为LocationListener，而不要在stopSelf()中致电onStartCommand() 。另外，在服务中覆盖onDestroy()，并明确调用removeUpdates()，以确保您的应用释放它以保持GPS无线电有效的请求。

这样的事情：

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) {

    }

}

停止包含LocationManager的后台服务

1 个答案: