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[英]Restart the service even if app is force-stopped and Keep running service in background even after closing the app How?
[英]Restart the service even if app is force-stopped and Keep running service in background even after closing the app How?
我正在嘗試在后台運行服務。 我的應用程序所做的是當用戶選中復選框然后服務啟動時,當它被取消選中時服務停止。 哪個工作得很好。 但問題是當我從任務管理器關閉應用程序時,它也會停止服務。 我想要的是即使在從任務管理器關閉后也能保持服務運行。
這個問題已經有人問過了,看這里。 我將復制接受的答案:
這是我使用的一個前台服務示例,該服務有效,當應用程序關閉時它保持活動狀態。 當然,它也必須啟動,並且對於該任務,應用程序必須在第一眼中運行,或者必須設置啟動事件的接收器,但這是另一回事。
public class MyService extends Service {
static final int NOTIFICATION_ID = 543;
public static boolean isServiceRunning = false;
@Override
public void onCreate() {
super.onCreate();
startServiceWithNotification();
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
if (intent != null && intent.getAction().equals(C.ACTION_START_SERVICE)) {
startServiceWithNotification();
}
else stopMyService();
return START_STICKY;
}
// In case the service is deleted or crashes some how
@Override
public void onDestroy() {
isServiceRunning = false;
super.onDestroy();
}
@Override
public IBinder onBind(Intent intent) {
// Used only in case of bound services.
return null;
}
void startServiceWithNotification() {
if (isServiceRunning) return;
isServiceRunning = true;
Intent notificationIntent = new Intent(getApplicationContext(), MyActivity.class);
notificationIntent.setAction(C.ACTION_MAIN); // A string containing the action name
notificationIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
PendingIntent contentPendingIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0);
Bitmap icon = BitmapFactory.decodeResource(getResources(), R.drawable.my_icon);
Notification notification = new NotificationCompat.Builder(this)
.setContentTitle(getResources().getString(R.string.app_name))
.setTicker(getResources().getString(R.string.app_name))
.setContentText(getResources().getString(R.string.my_string))
.setSmallIcon(R.drawable.my_icon)
.setLargeIcon(Bitmap.createScaledBitmap(icon, 128, 128, false))
.setContentIntent(contentPendingIntent)
.setOngoing(true)
// .setDeleteIntent(contentPendingIntent) // if needed
.build();
notification.flags = notification.flags | Notification.FLAG_NO_CLEAR; // NO_CLEAR makes the notification stay when the user performs a "delete all" command
startForeground(NOTIFICATION_ID, notification);
}
void stopMyService() {
stopForeground(true);
stopSelf();
isServiceRunning = false;
}
}
然后我運行它
Intent startIntent = new Intent(getApplicationContext(), MyService.class);
startIntent.setAction(C.ACTION_START_SERVICE);
startService(startIntent);
請注意用作操作的兩個常量,它們是必須以包名稱開頭的字符串。
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