Android屏幕解锁和点亮

最新推荐文章于 2024-03-27 15:49:15 发布

转载最新推荐文章于 2024-03-27 15:49:15 发布 · 813 阅读

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#android #keyboard #notifications #service #user #timer

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本文介绍了一种在Android系统中通过编程方式自动解锁屏幕并点亮屏幕的方法。具体步骤包括获取键盘锁管理器对象以解锁屏幕，以及获取电源管理器对象以控制屏幕亮度。此外，还详细解释了不同标志参数的作用及应用场景。

有些场景需要程序自动点亮屏幕,解开屏幕锁,以方便用户即时操作,下面用代码来实现这一功能:

//得到键盘锁管理器对象
KeyguardManager km= (KeyguardManager) getSystemService(Context.KEYGUARD_SERVICE);
//参数是LogCat里用的Tag
KeyguardLock kl = km.newKeyguardLock("unLock");
//解锁
kl.disableKeyguard();
//获取电源管理器对象
PowerManager pm=(PowerManager) getSystemService(Context.POWER_SERVICE);
//获取PowerManager.WakeLock对象,后面的参数|表示同时传入两个值,最后的是LogCat里用的Tag
PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.ACQUIRE_CAUSES_WAKEUP | PowerManager.SCREEN_DIM_WAKE_LOCK,"bright");
//点亮屏幕
wl.acquire();
//释放
wl.release();

需要在AndroidManifest.xml添加权限:

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

flags参数说明:

 
 PARTIAL_WAKE_LOCK: Screen off, keyboard light off  

  
  
SCREEN_DIM_WAKE_LOCK: screen dim, keyboard light off  

  
  
SCREEN_BRIGHT_WAKE_LOCK: screen bright, keyboard light off  

  
  
FULL_WAKE_LOCK: screen bright, keyboard bright

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：f 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.