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How to make screen backlight on/off like blinking during period of time in Android?


How to make screen backlight on/off like blinking during period of time in Android?

By : parvin
Date : November 17 2020, 01:00 AM
This might help you Is it possible to make the screen backlight of device turn on and off during e.g 30 seconds so that it looks like a blinking screen? , Try this in your class:
Create the power managr parameter
code :
PowerManager powerMan = (PowerManager) getSystemService(Context.POWER_SERVICE);
PowerManager.WakeLock wakeLock = powerMan.newWakeLock(
                     PowerManager.SCREEN_DIM_WAKE_LOCK | 
                     PowerManager.ACQUIRE_CAUSES_WAKEUP, "wakelockTag");
Timer timer = new Timer(); 
timer.schedule( new FlashingTimerTask(), 30000 );
public class FlashingTimerTask extends TimerTask{

    @Override
    public void run() {
            boolean screenOn = false;
            for (int i = 0; i < 30; i++) {
                if (screenOn) {
                    wakeLock.acquire();
                    screenOn = false;
                } else {
                    wakeLock.release();
                    screenOn = true;
                }
            }
    }
}


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By : Akhil King
Date : March 29 2020, 07:55 AM
Flashing Screen or Blinking Screen in Android

Flashing Screen or Blinking Screen in Android


By : user3608863
Date : March 29 2020, 07:55 AM
hop of those help? Emulator does not support brightness changing. For example, if you go to phone settings and change brightness there, nothing will happen. You need a real device if you want to see brightness changes.
How to make screen flashing/blinking from background service on Android device?

How to make screen flashing/blinking from background service on Android device?


By : Ritchie Veñales
Date : March 29 2020, 07:55 AM
around this issue From your Service you can interact with the WakeLock:
Acquire the WakeLock with:
code :
PowerManager powerMan = (PowerManager) getSystemService(Context.POWER_SERVICE);
PowerManager.WakeLock wakeLock = powerMan.newWakeLock(
                     PowerManager.SCREEN_DIM_WAKE_LOCK | 
                     PowerManager.ACQUIRE_CAUSES_WAKEUP, "wakelockTag");
wakeLock.acquire();
wakeLock.release(); 
new Thread() {
            public void run() {
                boolean screenOn = false;
                for (int i = 0; i < 5; i++) {
                    try {
                        sleep(500);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    if (screenOn) {
                        wakeLock.acquire();
                    } else {
                        wakeLock.release();
                    }
                }
            }
        }.run();
<uses-permission android:name="android.permission.WAKE_LOCK" />
Is there a way to lock Android screen after a certain period of time?

Is there a way to lock Android screen after a certain period of time?


By : Susan Kay Riley
Date : March 29 2020, 07:55 AM
Hope that helps My app uses a WakeLock and it automatically turns the screen on when it receives a SMS. I've set the duration so that it releases the WakeLock almost instantaneously, but it seems that in Settings, the minimum time the screen will turn off after inactivity is 15 seconds. I'm looking for the screen to turn off in a shorter period of time - say 5 seconds - to save battery. , Never mind, found an easy solution. Just set the timeout manually.
code :
Settings.System.putInt(context.getContentResolver(), Settings.System.SCREEN_OFF_TIMEOUT, 1000)
How can I make my android app not openable after a particular period of time?

How can I make my android app not openable after a particular period of time?


By : user2324439
Date : March 29 2020, 07:55 AM
This might help you You can try this method. I wrote little programm, launched it and all worked good)) After 30 days your programm will close after launching
code :
public class MainActivity extends AppCompatActivity {

public static final String MyPREFERENCES = "MyPrefs" ;
public static int demodays = 0;
public static int finishdate = 0;
SharedPreferences sharedpreferences;

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

    if (demodays == 0){
        DateFormat df = new SimpleDateFormat("D");
        String data = df.format(Calendar.getInstance().getTime());
        demodays = Integer.parseInt(data);
        finishdate = demodays + 30;

        sharedpreferences = getSharedPreferences(MyPREFERENCES, Context.MODE_PRIVATE);
        SharedPreferences.Editor editor = sharedpreferences.edit();
        editor.putInt("data", demodays);
        editor.putInt("finishdata", finishdate);
        editor.apply();
    }

    DateFormat df = new SimpleDateFormat("D");
    String today = df.format(Calendar.getInstance().getTime());
    int today1 = Integer.parseInt(today);

    if (today1 == finishdate) {
        Toast toast = Toast.makeText(getApplicationContext(),
                "Period of trial has finished", Toast.LENGTH_SHORT);
        toast.show();
        this.finish();
    }
}
}
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