一、解锁

//屏锁管理器
KeyguardManager km= (KeyguardManager) context.getSystemService(Context.KEYGUARD_SERVICE);
KeyguardManager.KeyguardLock kl = km.newKeyguardLock("unLock");
//解锁
kl.disableKeyguard();

二、获取电源锁，保持该服务在屏幕熄灭时仍然能唤醒

PowerManager pm=(PowerManager) context.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 wakeLock = pm.newWakeLock(PowerManager.ACQUIRE_CAUSES_WAKEUP | PowerManager.SCREEN_DIM_WAKE_LOCK,"bright");
//点亮屏幕
//wakeLock.acquire(10*60*1000L /*10 minutes*/);
wakeLock.acquire();

三、权限申请

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

四、各种锁的类型对CPU 、屏幕、键盘的影响：

PARTIAL_WAKE_LOCK:保持CPU 运转，屏幕和键盘灯有可能是关闭的。

SCREEN_DIM_WAKE_LOCK：保持CPU 运转，允许保持屏幕显示但有可能是灰的，允许关闭键盘灯

SCREEN_BRIGHT_WAKE_LOCK：保持CPU 运转，允许保持屏幕高亮显示，允许关闭键盘灯

FULL_WAKE_LOCK：保持CPU 运转，保持屏幕高亮显示，键盘灯也保持亮度

ACQUIRE_CAUSES_WAKEUP：强制使屏幕亮起，这种锁主要针对一些必须通知用户的操作.

ON_AFTER_RELEASE：当锁被释放时，保持屏幕亮起一段时间

五、实例测试

package com.giada.wakeup;

import androidx.appcompat.app.AppCompatActivity;

import android.app.KeyguardManager;
import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.os.PowerManager;
import android.util.Log;

import static android.os.PowerManager.ACQUIRE_CAUSES_WAKEUP;

public class MainActivity extends AppCompatActivity {
    String TAG="WAKEUP";
    PowerManager.WakeLock wakeLock = null;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        wakeUpAndUnlock(this);
    }
    public static void wakeUpAndUnlock(Context context){
        //屏锁管理器
        KeyguardManager km= (KeyguardManager) context.getSystemService(Context.KEYGUARD_SERVICE);
        KeyguardManager.KeyguardLock kl = km.newKeyguardLock("unLock");
        //解锁
        kl.disableKeyguard();
        //获取电源管理器对象
        PowerManager pm=(PowerManager) context.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 wakeLock = pm.newWakeLock(PowerManager.ACQUIRE_CAUSES_WAKEUP | PowerManager.SCREEN_DIM_WAKE_LOCK,"bright");
        //点亮屏幕
        //wakeLock.acquire(10*60*1000L /*10 minutes*/);
        wakeLock.acquire();
        //释放
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                wakeLock.release();
            }
        }, 20000);//3秒后执行Runna
       // wakeLock.release();
    }

    private void wakeUp() {
        PowerManager powerManager = (PowerManager) getSystemService(POWER_SERVICE);
        if (!powerManager.isInteractive()) {
            //PowerManager.WakeLock wakeLock = powerManager.newWakeLock(PowerManager.ACQUIRE_CAUSES_WAKEUP | PowerManager.SCREEN_DIM_WAKE_LOCK, "wakeupdemo");
            PowerManager.WakeLock wakeLock = powerManager.newWakeLock(PowerManager.ACQUIRE_CAUSES_WAKEUP | PowerManager.SCREEN_BRIGHT_WAKE_LOCK | PowerManager.ON_AFTER_RELEASE, "wakeupdemo");
            //点亮屏幕
            //wakeLock.acquire(1000L);
            wakeLock.acquire(10*60*1000L /*10 minutes*/);
            //释放
           // wakeLock.release();
        }
    }

}

六、实际测试，在屏幕熄灭进入休眠后，用adb 运行这个app， 屏幕会亮起来，过几秒会稍微暗（因为SCREEN_DIM_WAKE_LOCK参数，如果想一直高亮可以用SCREEN_BRIGHT_WAKE_LOCK），20秒之后执行release后就又进行休眠。

七、有价值的参考文章

Android应用程序保持后台唤醒(使用WakeLock实现)_小zhong的博客-程序员宅基地_android通知唤醒

https://www.jb51.net/article/111513.htm