Android屏幕解锁和点亮

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:

                    1.//得到键盘锁管理器对象 
            2.KeyguardManagerkm=(KeyguardManager)getSystemService(Context.KEYGUARD_SERVICE); 
            3.//参数是LogCat里用的Tag 
            4.KeyguardLockkl=km.newKeyguardLock("unLock"); 
            5.//解锁 
            6.kl.disableKeyguard(); 
            7. 
            8.//获取电源管理器对象 
            9.PowerManagerpm=(PowerManager)getSystemService(Context.POWER_SERVICE); 
            10.//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 
            11.PowerManager.WakeLockwl=pm.newWakeLock(PowerManager.ACQUIRE_CAUSES_WAKEUP|PowerManager.SCREEN_DIM_WAKE_LOCK,"bright"); 
            12.//点亮屏幕 
            13.wl.acquire(); 
            14.//释放 
            15.wl.release();

需要在AndroidManifest.xml添加权限:

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

2、保持屏幕唤醒
use the window flag FLAG_KEEP_SCREEN_ON把下面的代码加入到程序onCreate方法中

                    @Override
            protectedvoidonCreate(Bundleicicle){ 
            super.onCreate(icicle); 
            //Setkeepscreenon 
            
            getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON); 
            }

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