方法一：

复制代码 代码如下:

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

复制代码 代码如下:

private PowerManager powerManager = null;

private WakeLock wakeLock = null;

powerManager = (PowerManager) this.getSystemService(Service.POWER_SERVICE);

wakeLock = this.powerManager.newWakeLock(PowerManager.SCREEN_DIM_WAKE_LOCK, "My Lock");

//是否需计算锁的数量

wakeLock.setReferenceCounted(false);

//请求常亮，onResume()

wakeLock.acquire();

//取消屏幕常亮，onPause()

wakeLock.release();

方法二:

直接在onCreate()里，不用权限

复制代码 代码如下:

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