让屏幕保持一直亮

 @Override
    protected void onCreate(Bundle icicle) {
        super.onCreate(icicle);

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

最好别用

PowerManager and the WAKE_LOCK permission
AndroidManifest.xml:
<uses-permission android:name="android.permission.WAKE_LOCK" />

 Activity:
PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
PowerManager.WakeLock mWakeLock = pm.newWakeLock(PowerManager.SCREEN_DIM_WAKE_LOCK, "My Tag");
mWakeLock.acquire();
// ...
mWakeLock.release();
因为此种方法在周期循环的时候会出现异常