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我正在使用Location偵聽器服務來每隔幾秒更新用戶的當前位置。我還使用WakeLock使聽衆在後臺工作。現在一切正常，但我無法停止Location偵聽器。即使應用程序強制關閉，偵聽器也會將用戶位置更新爲數據庫。如何停止位置偵聽器服務？ （現在不停止）
位置監聽器：
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.location.Location;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.IBinder;
import android.os.PowerManager;
import android.support.v4.app.ActivityCompat;
import android.util.Log;
import android.widget.Toast;
import com.google.android.gms.maps.model.LatLng;
public class MyLocationService extends Service {
private static final String TAG = "MyLocationService";
private LocationManager mLocationManager = null;
private static final int LOCATION_INTERVAL = 3000;
private static final float LOCATION_DISTANCE = 0f;
Context context = this;
PowerManager.WakeLock wakeLock;
public int e=0;
LocationListener[] mLocationListeners = new LocationListener[]{
new LocationListener(LocationManager.GPS_PROVIDER),
new LocationListener(LocationManager.NETWORK_PROVIDER)
};
@Override
public IBinder onBind(Intent arg0) {
return null;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.e(TAG, "onStartCommand");
super.onStartCommand(intent, flags, startId);
Toast.makeText(this, "MyService Started.", Toast.LENGTH_SHORT).show();
return START_STICKY;
}
@Override
public void onCreate() {
Log.e(TAG, "onCreate");
initializeLocationManager();
PowerManager mgr = (PowerManager)context.getSystemService(Context.POWER_SERVICE);
wakeLock= mgr.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "MyWakeLock");
wakeLock.acquire();
try {
mLocationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER, LOCATION_INTERVAL, LOCATION_DISTANCE,
mLocationListeners[1]);
} catch (java.lang.SecurityException ex) {
Log.i(TAG, "fail to request location update, ignore", ex);
} catch (IllegalArgumentException ex) {
Log.d(TAG, "network provider does not exist, " + ex.getMessage());
}
try {
mLocationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER, LOCATION_INTERVAL, LOCATION_DISTANCE,
mLocationListeners[0]);
} catch (java.lang.SecurityException ex) {
Log.i(TAG, "fail to request location update, ignore", ex);
} catch (IllegalArgumentException ex) {
Log.d(TAG, "gps provider does not exist " + ex.getMessage());
}
}
@Override
public void onDestroy() {
Log.e(TAG, "onDestroy");
wakeLock.release();
super.onDestroy();
if (mLocationManager != null) {
for (int i = 0; i < mLocationListeners.length; i++) {
try {
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
mLocationManager.removeUpdates(mLocationListeners[i]);
} catch (Exception ex) {
Log.i(TAG, "fail to remove location listners, ignore", ex);
}
}
}
}
private void initializeLocationManager() {
Log.e(TAG, "initializeLocationManager");
if (mLocationManager == null) {
mLocationManager = (LocationManager) getApplicationContext().getSystemService(Context.LOCATION_SERVICE);
}
}
// create LocationListener class to get location updates
private class LocationListener implements android.location.LocationListener
{
Location mLastLocation;
double latitude;
double longitude;
LatLng latLngcurrent;
public LocationListener(String provider)
{
Log.e(TAG, "LocationListener " + provider);
mLastLocation = new Location(provider);
}
@Override
public void onLocationChanged(Location location)
{
Log.e(TAG, "onLocationChanged: " + location);
mLastLocation.set(location);
latitude = location.getLatitude();
longitude = location.getLongitude();
Store.latu=latitude;
Store.longu=longitude;
latLngcurrent = new LatLng(location.getLatitude(), location.getLongitude());
Toast.makeText(context,"Location " + String.valueOf(e), Toast.LENGTH_SHORT).show();
e++;
Toast.makeText(MyLocationService.this,Store.latu+" "+Store.longu, Toast.LENGTH_SHORT).show();
}
@Override
public void onProviderDisabled(String provider)
{
Log.e(TAG, "onProviderDisabled: " + provider);
}
@Override
public void onProviderEnabled(String provider)
{
Log.e(TAG, "onProviderEnabled: " + provider);
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras)
{
Log.e(TAG, "onStatusChanged: " + provider);
}
}
}
啓動服務意向：（從mainactivity）
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
Intent serviceIntent = new Intent(context , MyLocationService.class);
context.startService(serviceIntent );
if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
checkLocationPermission();
}
if (!isGooglePlayServicesAvailable()) {
finish();
} else {
Log.d("onCreate", "Google Play Services available.");
}
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
}
停止意圖：（從mainactivity）
private class LogOutTimerTask extends TimerTask
{
@Override
public void run()
{
Intent i = new Intent(MapsActivity.this, Login.class);
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(i);
Intent intent = new Intent(MapsActivity.this, MyLocationService.class);
stopService(intent);
finish();
}
}
停止意圖在用戶註銷時調用，現在服務類中的onDestroy（）方法被調用，但它不停止進程。當應用程序被強制關閉時，onDestroy（）甚至不會被調用。在這兩種情況下，過程都會恢復並不斷更新值到DB.Thanks提前。
是'removeUpdates（）'被調用？或者由於權限'IF'返回該方法？雖然，爲什麼你在刪除監聽器時檢查權限？這應該是'initializeLocationManager（）'或者''' – Yazan
我還沒有檢查removeupdates（）是否被調用。我已經添加了權限，因爲android studio正在推薦我。 @Yazan –
我懷疑這個地方是不是很好的請求一個許可（同時銷燬服務？！），但是，它不是很好放置在循環中，你可以要求它一次（循環之前）也嘗試添加在'removeUpdates（）'之前的日誌'Log.i（TAG，「移除監聽者...」）;'看看它是否出現在logcat中 – Yazan