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目前做一个电子班牌的项目，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
<receiver
android:name="control.screen.hw.com.sreencontroldemo.ScreenOffAdminReceiver"
android:label="@string/app_name"
android:permission="android.permission.BIND_DEVICE_ADMIN" >
<meta-data
android:name="android.app.device_admin"
android:resource="@xml/device_admin" />
<intent-filter>
<action android:name="android.app.action.DEVICE_ADMIN_ENABLED" />
</intent-filter>
</receiver>
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：
<?xml version="1.0" encoding="utf-8"?>
<device-admin xmlns:android="http://schemas./apk/res/android">
<uses-policies>
<limit-password />
<reset-password />
<force-lock />
</uses-policies>
</device-admin>
2.xml代码：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas./apk/res/android"
xmlns:app="http://schemas./apk/res-auto"
xmlns:tools="http://schemas./tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="control.screen.hw.com.sreencontroldemo.MainActivity">
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:onClick="checkScreen"
android:text="检测屏幕状态" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:onClick="checkScreenOn"
android:text="亮屏" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:onClick="checkScreenOff"
android:text="熄屏" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:onClick="checkScreenOffAndDelayOn"
android:text="熄屏后再亮屏" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:onClick="checkAndTurnOnDeviceManager"
android:text="去启动设备管理器权限" />
</LinearLayout>
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();
<!-- 清除屏保需要的权限 -->
<uses-permission android:name="android.permission.DISABLE_KEYGUARD" />
<!-- 唤醒屏幕需要的权限 -->
<uses-permission android:name="android.permission.WAKE_LOCK" />
后话：
参考感谢：https://blog.csdn.net/u011913612/article/details/77822280
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