一、申请WAKE_LOCK 权限
二、Activity 中设置FLAG_KEEP_SCREEN_ON FLAG

一、申请WAKE_LOCK 权限

在AndroidMainfest.xml 中申请 WAKE_LOCK 唤醒锁权限

<?xml version="1.0" encoding="utf-8"?>

    ... ...

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

    ... ...

</manifest>

二、Activity 中设置FLAG_KEEP_SCREEN_ON FLAG

Activity OnCreate 方法中设置Flag

... ...

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        /**
         * 屏幕常亮需要 申请屏幕 WAKE_LOCK 唤醒锁 权限
         *  <uses-permission android:name="android.permission.WAKE_LOCK" />
         * **/
        getWindow().setFlags(android.view.WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON,
                android.view.WindowManager.LayoutParams.FL