In AndroidManifest.xml 加上權(quán)限:

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

?

方法一：

public class UnLockActivity2 extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

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

方法二：

public class UnLockActivity extends Activity {
/** Called when the activity is first created. */

WakeLock m_wklk;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

PowerManager pm = (PowerManager)getSystemService(POWER_SERVICE);
m_wklk = pm.newWakeLock(PowerManager.SCREEN_DIM_WAKE_LOCK, "cn");

m_wklk.acquire(); //設(shè)置保持喚醒
}

@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
m_wklk.release(); //解除保持喚醒
}

@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();

m_wklk.release();//解除保持喚醒

}

@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();


m_wklk.acquire(); //設(shè)置保持喚醒
}


}

?

解釋：

用到的類

PowerManager

主要是這兩個(gè)參數(shù)：PowerManager.SCREEN_BRIGHT_WAKE_LOCK | PowerManager.ON_AFTER_RELEASE

下面是 android 官方API?解釋：

?

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

Flag ValueCPUScreenKeyboardPARTIAL_WAKE_LOCKSCREEN_DIM_WAKE_LOCKSCREEN_BRIGHT_WAKE_LOCKFULL_WAKE_LOCK

On*	Off	Off
On	Dim	Off
On	Bright	Off
On	Bright	Bright

一般要使程序運(yùn)行過(guò)程中背景保持常亮，使用

SCREEN_BRIGHT_WAKE_LOCK 就可以，

SCREEN_BRIGHT_WAKE_LOCK?CPU：喚醒 屏幕背光：喚醒 鍵盤燈：關(guān)閉

第二個(gè)參數(shù)：

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

Flag ValueDescriptionACQUIRE_CAUSES_WAKEUPON_AFTER_RELEASE

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 would be for notifications which are important for the user to see immediately.

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 cycling between wake lock conditions.

?

http://www.cnblogs.com/chengning/archive/2012/04/26/2472789.html

http://mysuperbaby.iteye.com/blog/1454178

http://wenku.baidu.com/view/a9c0fa01de80d4d8d15a4f96.html

http://blog.csdn.net/xieying15170814609/article/details/7723928

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