How to keep a Service alive?

问题:

How Whatsapp service keep working in background in huawei phones ?

I removed whatsapp of protected apps but Whatsapp service not closed in screen off time.

I'm writing critical app that need to run every time but my service killed in screen off.

I want to write service like Whatsapp or AirDroid service anyone can explain about that ?

I mean how to write service that specially not close by screen off in HUAWEI phones

This is my service code

AppLifeService

public class AppLifeService extends Service {
@Override
public IBinder onBind(Intent intent) {

    return null;
}



@Override
public void onCreate() {
    super.onCreate();

}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {

    super.onStartCommand(intent, flags, startId);


    startForeground(5, AppLifeReciever.createNotification(this));


    return  START_STICKY;
}


@Override
public void onDestroy() {


    //startService(new Intent(this, AppLifeService.class)); Updated : not need


    super.onDestroy();

}
}

回答1:

Service with START_STICKY in retrun onStartCommand() will start again automatically you dont need to start it again in onDestroy()

    @Override
    public void onDestroy() {

      //  startService(new Intent(this, AppLifeService.class));
        super.onDestroy();

    }

回答2:

You need to create a Service to "reopen" BroadcastService automatically when it's closed.

For example:

BroadcastService

public class MyBroadcastService extends BroadcastReceiver
{

 @Override
    public void onReceive(final Context context, Intent intent)
    {
     //do something
    }
}

Service to "reopen" automatically

public class MyService extends Service
{

@Override
    public void onCreate()
    {
        // Handler will get associated with the current thread,
        // which is the main thread.
        super.onCreate();
        ctx = this;

    }

 @Override
    public IBinder onBind(Intent arg0)
    {
        // TODO Auto-generated method stub

        return null;
    }

@Override
    public int onStartCommand(Intent intent, int flags, int startId)
    {
        Log.i(TAG, "onStartCommand");
        //Toast.makeText(this, "onStartCommand", Toast.LENGTH_LONG).show();

        return START_STICKY;
    }

//launch when its closed
@Override
    public void onDestroy()
    {
        super.onDestroy();
        sendBroadcast(new Intent("YouWillNeverKillMe"));
        Toast.makeText(this, "YouWillNeverKillMe TOAST!!", Toast.LENGTH_LONG).show();
    }
}

Declare on your AndroidManifest.XML

<receiver android:name=".BroadcastServicesBackground.MyBroadcastService">
            <intent-filter>
                <!--That name (YouWillNeverKillMe) you wrote on Myservice-->
                <action android:name="YouWillNeverKillMe"/>

                <data android:scheme="package"/>
            </intent-filter>
            <intent-filter>
                 <!--To launch on device boot-->
                <action android:name="android.intent.action.BOOT_COMPLETED"/>
            </intent-filter>
        </receiver>

        <service android:name=".Services.MyService"/>

回答3:

@Sohail Zahid Answer tells you a way to repeatedly start a service again and again when stopped. But in order to keep a service alive like playing a song in a background.

The best Approach I found is

startForeground(int, Notification)

where int value must be unique for every notification

You'll need to supply a Notification to the method which is displayed in the Notifications Bar in the Ongoing section. In this way the app will keep alive in background without any interuption.