Android熄屏与亮屏控制

目前做一个项目，需要做到熄屏与亮屏，网上找了很多，都是利用PowerManager，但是需要系统权限，这个比较麻烦，后面找到一个，测试发现可行的方案，就是利用设备管理器DevicePolicyManager执行熄屏，利用PowerManager进行亮屏，下面是步骤与代码。

1.注册：DeviceAdminReceiver

ScreenOffAdminReceiver为继承DeviceAdminReceiver：

public class ScreenOffAdminReceiver extends DeviceAdminReceiver {
    private void showToast(Context context, String msg) {
        Toast.makeText(context, msg, Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onEnabled(Context context, Intent intent) {
        showToast(context,
                "设备管理器使能");
    }

    @Override
    public void onDisabled(Context context, Intent intent) {
        showToast(context,
                "设备管理器没有使能");
    }

}

device_admin为device_admin.xml，在res/xml文件夹下面：

2.xml代码：

3.MainActivity代码：

public class MainActivity extends AppCompatActivity {
    private String tag = "MainActivity";
    private Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            switch (msg.what) {
                case 1:
                    checkScreenOn(null);
                    break;
                case 2:

                    break;
            }
        }
    };
    private DevicePolicyManager policyManager;
    private ComponentName adminReceiver;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        adminReceiver = new ComponentName(MainActivity.this, ScreenOffAdminReceiver.class);
        mPowerManager = (PowerManager) getSystemService(POWER_SERVICE);
        policyManager = (DevicePolicyManager) MainActivity.this.getSystemService(Context.DEVICE_POLICY_SERVICE);
        checkAndTurnOnDeviceManager(null);

    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        isOpen();
    }


    private void isOpen() {
        if (policyManager.isAdminActive(adminReceiver)) {//判断超级管理员是否激活
            showToast("设备已被激活");
        } else {
            showToast("设备没有被激活");

        }
    }
    private PowerManager mPowerManager;
    private PowerManager.WakeLock mWakeLock;


    /**
     * @param view 检测屏幕状态
     */
    public void checkScreen(View view) {
        PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
        boolean screenOn = pm.isScreenOn();
        if (!screenOn) {//如果灭屏
            //相关操作
            showToast("屏幕是息屏");
        } else {
            showToast("屏幕是亮屏");

        }
    }


    /**
     * @param view 亮屏
     */
    public void checkScreenOn(View view) {
        mWakeLock = mPowerManager.newWakeLock(PowerManager.SCREEN_BRIGHT_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP, "tag");
        mWakeLock.acquire();
        mWakeLock.release();
    }

    /**
     * @param view 熄屏
     */
    public void checkScreenOff(View view) {
        boolean admin = policyManager.isAdminActive(adminReceiver);
        if (admin) {
            policyManager.lockNow();
        } else {
            showToast("没有设备管理权限");
        }
    }

    /**
     * @param view 熄屏并延时亮屏
     */
    public void checkScreenOffAndDelayOn(View view) {
        boolean admin = policyManager.isAdminActive(adminReceiver);
        if (admin) {
            policyManager.lockNow();
            handler.sendEmptyMessageDelayed(1, 3000);
        } else {
            showToast("没有设备管理权限");
        }
    }

    /**
     * @param view 检测并去激活设备管理器权限
     */
    public void checkAndTurnOnDeviceManager(View view) {
        Intent intent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);
        intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN, adminReceiver);
        intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION, "开启后就可以使用锁屏功能了...");//显示位置见图二
        startActivityForResult(intent, 0);

    }


    private void showToast(String Str) {
        Toast.makeText(this, Str, Toast.LENGTH_SHORT).show();
    }
}

4.发现的问题
如果手机有屏保，熄屏后再亮屏会显示屏保。应该取消掉设备的屏保，定制的设备应该是可以做到的吧。或者可以通过KeyguardManager代码实现禁止锁屏：

KeyguardManager km = (KeyguardManager) getSystemService(KEYGUARD_SERVICE);
KeyguardManager.KeyguardLock kl = km.newKeyguardLock("name");
kl.disableKeyguard();

 
 
 
 
  

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后话：
参考感谢：https://blog.csdn.net/u011913612/article/details/77822280