Run service even if the app is not open

Question

I am creating an alarm clock app and in the tests I would like it to wake up (in this example it still vibrates), but I am not able to make it run in the background and so does not end up awakening, how can I make sure that even if the app has been destroyed it keeps checking the time and if the time beats then it manifests itself, the way the code is seeing two problems: it is waiting for a certain trigger to be activated and ends up not awakening if the screen is in Sleep even if the app is open, and consequently does not run the validation of the time if the app is closed, just installed as an alarm clock even: Androidmanifest.xml

<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

    <service android:name="com.rafah.screenstate.LockService">
        <intent-filter>
            <action android:name="android.intent.action.BOOT_COMPLETED" />
        </intent-filter>
    </service>
</application>

Mainactivity.class

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    //starting the service Class
    startService(new Intent(getApplicationContext(), LockService.class));

   }
}

Lockservice.class

public class LockService extends Service {

   @Nullable
   @Override
   public IBinder onBind(Intent intent) {
       return null;
   }

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

   @Override
   public int onStartCommand(Intent intent, int flags, int startId) {
       final IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
       filter.addAction(Intent.ACTION_SCREEN_OFF);
       filter.addAction(Intent.ACTION_USER_PRESENT);

       //Calling the BroadCast
       final BroadcastReceiver mReceiver = new ScreenReceiver();
       registerReceiver(mReceiver, filter);

       return super.onStartCommand(intent, flags, startId);
   }

   //AINDA NÃO SEI PARA QUE SERVE
   public class LocalBinder extends Binder{
       LockService getService(){
           return LockService.this;
       }
   }

}

Screenreceiver.class

public class ScreenReceiver extends BroadcastReceiver {

public static boolean wasScreenOn = true;

@Override
public void onReceive(Context context, Intent intent) {
    Log.e("test", "onReceive Broadcast");

    SimpleDateFormat Dformat = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss");
    Date date = new Date();

    Calendar cal = Calendar.getInstance();
    cal.setTime(date);
    Date data_atual = cal.getTime();
    String sysdate  = Dformat.format(data_atual);

    if (sysdate.equals("03/04/2018 22:09:02")){
        //Vibrate test
        Vibrator vibrator = (Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE);
        vibrator.vibrate(6000);
     }

   }
}

What I need is that it vibrates in the pre-programmed schedule even the app has passed by the state.

Answer 1

Try to put this attribute in your tag.

<service android:name="service" android:stopWithTask="true"/>