如何在Android中以编程方式关闭屏幕？

Question

I want to turn off the screen when the user clicks a button. I am trying to do it with PowerManager class but I don't obtain good results. What is the best way to turn off the screen in android?.

I am using the code below:

  PowerManager pm = (PowerManager)this.getSystemService( Context.POWER_SERVICE); PowerManager.WakeLock wl = pm.newWakeLock( PowerManager.PARTIAL_WAKE_LOCK, ""); wl.acquire(); 

But only work this code:

  WindowManager.LayoutParams params = getWindow().getAttributes(); params.flags = WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON; params.screenBrightness = 0; getWindow().setAttributes(params); 

But, this code only set brightness to 0 but no turns off the screen.

Thanks a lot.

Answer 1

You can turn off screen by overriding system screen turn off time.

First get system turn off time

int defaultTurnOffTime =  Settings.System.getInt(getContentResolver(),Settings.System.SCREEN_OFF_TIMEOUT, 60000);

then put your turn off time

Settings.System.putInt(getContentResolver(),Settings.System.SCREEN_OFF_TIMEOUT, 1000);

and when the screen turned off, set default turn off time

Settings.System.putInt(getContentResolver(),Settings.System.SCREEN_OFF_TIMEOUT, defaultTurnOffTime);

add below permission

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