Android: How to turn screen on and off programmatically?

Question

Before marking this post as a \"duplicate\", I am writing this post because no other post holds the solution to the problem.

I am trying to turn off the device, then

Answer 1

Here is a successful example of an implementation of the same thing, on a device which supported lower screen brightness values (I tested on an Allwinner Chinese 7" tablet running API15).

WindowManager.LayoutParams params = this.getWindow().getAttributes();

/** Turn off: */
params.flags = WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON;
//TODO Store original brightness value
params.screenBrightness = 0.1f;
this.getWindow().setAttributes(params);

/** Turn on: */
params.flags = WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON;
//TODO restoring from original value
params.screenBrightness = 0.9f;
this.getWindow().setAttributes(params);

If someone else tries this out, pls comment below if it worked/didn't work and the device, Android API.