Android 停止包含LocationManager的后台服务
我使用Android 停止包含LocationManager的后台服务,android,Android,我使用startService（intent）从主活动启动后台服务，它将用户的位置发送到服务器。如果用户不希望，我希望通过单击菜单中的按钮，使其能够停止此服务（同时停止从onLocationChanged方法触发数据的requestLocationUpdates）。 我已经尝试了onOptionsItemSelected方法中的代码，但是当我单击按钮时，它仍然可以工作 我怎样才能停止这项服务 main活动： @Override protected void onCreate(Bundle
startService（intent）requestLocationUpdatesonOptionsItemSelected @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);
}
}
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);
}
}
@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);
}
}
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);
}
}
看起来就像你现在的编码方式，你的服务并没有真正起到任何作用 由于您已将您的
MyLocationListeneronStartCommand（）stopSelf（）onStartCommand（）中调用stopSelf（）
.
另外，在服务中覆盖onDestroy（）
，并显式调用removeUpdates（）
，以确保应用程序释放保持GPS无线电活动的请求
大概是这样的：
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) {
}
}
但是如何从Main活动中的OnOptions ItemSelected（）
调用TrackingService中的onDestroy（）
？我必须将其作为菜单的一个选项来实现。@lightondestory（）
将在您调用stopService（I）
时被调用，因此通过对您的服务进行这些更改，您应该能够保持您的MainActivity代码与您的问题相同。至于LocationListener ll
，它是不需要的，因为您只需在服务中使用此
作为LocationListener引用。是否有建议的方法在停止服务后重新启动服务？@light，您只需调用startService（）
，就像您当前在onCreate（）
中所做的那样，如果您想让用户选择重新开始位置跟踪，您可以从另一个菜单项执行此操作。（或者，您可以将一个菜单项更改为开关，并在用户每次选择启动或停止位置跟踪时更改文本）。请看一下这个问题？