android的PowerManager

作者：朱博 

PowerManager顾名思义用来控制设备的电量。

使用这个API会对设备电池的寿命造成影响。除非真的需要，否则一般不推荐使用，即使你使用了该API也要尽可能使用

低级别并保证每次在申请完wakelock（唤醒锁自己翻译的………）应即时的释放它。

你可以通过调用Context.getSystemService().来获得本类实例。

本类的简单用法：

PowerManager pm =(PowerManager) getSystemService(Context.POWER_SERVICE);
 PowerManager.WakeLock wl= pm.newWakeLock(PowerManager.SCREEN_DIM_WAKE_LOCK,"My Tag");
 wl.acquire();
   ..screen will stay on duringthis section..
 wl.release();

Flag Value	CPU	屏幕	键盘
PARTIAL_WAKE_LOCK	开	关	关
SCREEN_DIM_WAKE_LOCK	开	暗	关
SCREEN_BRIGHT_WAKE_LOCK	开	亮	亮
FULL_WAKE_LOCK	开	亮	亮

 

In addition, you can add two more flags, which affect behavior of the screen only.These flags have no effect when combined with a PARTIAL_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 would be for notifications 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 cycling between wake lock conditions.

 

权限获取

要进行电源的操作需要在AndroidManifest.xml中声明该应用有设置电源管理的权限。

    
    
    
    

     
     
     
     <
     
     
     
     uses-permission 
     
     
     
     android:name
     
     
     
     ="android.permission.WAKE_LOCK"
     
     
     
     
     
     
     
     /> 
     
     
     
     你可能还需要 
     
     
     
     <
     
     
     
     uses-permission 
     
     
     
     android:name
     
     
     
     ="android.permission.DEVICE_POWER"
     
     
     
     
     
     
     
     /> 
    
    
    
    

有时间证实一下什么效果 嘿嘿