Android screen always bright background always bright

Topic:

When the android program is running, the background light remains awake, that is, no black screen.

First run the Code:

Note that you need to add permissions

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

/***** @ Author zhujianbin **/public class utils {Private Static wakelock Wl;/*** keep the screen awake (that is, the background light is not off) * @ Param on whether to wake up */public static void keepscreenon (context, Boolean on) {If (on) {powermanager PM = (powermanager) context. getsystemservice (context. power_service); WL = PM. newwakelock (powermanager. screen_bright_wake_lock | powermanager. on_after_release, "= keepscreenon ="); WL. acquire ();} else {WL. release (); WL = NULL ;}}}

Explanation:

Classes used

Powermanager

These two parameters are used: powermanager. screen_bright_wake_lock | powermanager. on_after_release

Below is the official Android API
Explanation:

He following flags are defined, with varying effects on system power.These flags are mutually exclusive-you may only specify one of them.

Flag Value	CPU	Screen	Keyboard
PARTIAL_WAKE_LOCK	On *	Off	Off
SCREEN_DIM_WAKE_LOCK	On	Dim	Off
SCREEN_BRIGHT_WAKE_LOCK	On	Bright	Off
FULL_WAKE_LOCK	On	Bright	Bright

It is generally necessary to keep the background normally when the program is running.

Screen_bright_wake_lock,

Screen_bright_wake_lock CPU: Wake up screen backlight: Wake up keyboard light: Off

The second parameter:

In addition, you can add two more flags, which affect behavior of the screen only.These flags have no effect when combined withPARTIAL_WAKE_LOCK.

Flag Value	Description
ACQUIRE_CAUSES_WAKEUP	Normal wake locks don't actually turn on the illumination. instead, they cause the illumination to remain on once it turns on (e.g. from user activity ). this flag will force the screen and/or keyboard to turn on immediately, when the wakelock is acquired. A typical use wocould be for communications which are important for the user to see immediately.
ON_AFTER_RELEASE	If this flag is set, the user activity timer will be reset when the wakelock is released, causing the illumination to remain on a bit longer. this can be used to reduce flicker if you are using ing between wake lock conditions.