block "erasing" the screen for downtime

Question

My application works as a guide for a professional illuminator, it works passively(responds via Bluetooth to user commands in your work tool) or offline where the user can operate it manually in parallel with your tool, the issue is that in both occasions the user would be a long time without interacting with the application, but reading your data constantly, it is essential that the screen does not erase or darken, I know that the user may well set this manually, but I wanted to do from within the application.

I searched on Google but only appears bullshit, talking app to save battery and etc, the problem is that keywords are the same of various questions of users laypeople.

I searched the site but found nothing here.

I looked at Developers from Google, but because I don’t know English very well, and because their explanation isn’t very intuitive, I didn’t get any constructive results. someone can help me?

Answer 1

Try putting this on onCreate of his Activity

getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

Or within your layout:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:keepScreenOn="true">

If you would like to read more about:

https://developer.android.com/training/scheduling/wakelock.html

I hope it helps!

Answer 2

I think you’re gonna need this Wakelock, but it seems that the above answer also solves in doubt makes the test with the two in different appliances.

There is also the option to do this partially Wakelock Partial

//ONCREATE
PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.SCREEN_DIM_WAKE_LOCK, TAG);
wl.acquire(); //informa para nao desligar a tela

//quando sair da atividade ou do apk 
wl.release(); //informa que já esta liberado para desligar