如何以编程方式在android中关闭屏幕

Question

I want to turn off the screen. So I tried to do it with PowerManager class but it didn't turn off screen.

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

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"/>

Answer 2

It's not clear from the question if you've tried this, but you might need to make sure that you have the in your manifest:

Any application using a WakeLock must request the android.permission.WAKE_LOCK permission in an element of the application's manifest.

Another area that you might look is logcat to see if there is any stack traces or errors being logged, which could provide more context for people to help out.

Answer 3

@SuperDev , add the following to your Manifest:

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

This will resolve your app crash.

Hope it helps :)