设备管理器

1.DeviceAdminReceiver：设备管理接收者，该类提供了系统发出的意图动作。你的设备管理应用程序必须包含一个

DeviceAdminReceiver 的子类。代表着手机上的设备管理器。

2.DevicePolicyManager  设备管理员

1.创建一个类继承DeviceAdminReceiver

public class MyReceiver extends DeviceAdminReceiver {

}

2.配置 manifest

<receiver android:name=".MyReceiver"
                  android:label="@string/sample_device_admin"
                  android:description="@string/sample_device_admin_description"
                  android:permission="android.permission.BIND_DEVICE_ADMIN">

            <meta-data android:name="android.app.device_admin"
                       android:resource="@xml/device_admin_sample" />
            <intent-filter>
                <action android:name="android.app.action.DEVICE_ADMIN_ENABLED" />
            </intent-filter>
</receiver>

3.实现锁屏

<span style="white-space:pre">	</span>DevicePolicyManager dm = (DevicePolicyManager) getSystemService(DEVICE_POLICY_SERVICE);
<span style="white-space:pre">	</span>dm.lockNow();

4.报异常，因为没有激活

<span style="white-space:pre">	</span>Caused by: java.lang.SecurityException: No active admin owned by uid 10048 for policy #3

5.激活

 <span style="white-space:pre">	</span>mComponentName = new ComponentName(this, MyReceiver.class);
        Intent intent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);
        intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN, mComponentName);
        intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION, "激活");
        startActivity(intent);

6.激活的应用无法直接卸载

 <span style="white-space:pre">	</span>//移除管理员权限
        mDm = (DevicePolicyManager) getSystemService(DEVICE_POLICY_SERVICE);
        mDm.removeActiveAdmin(mComponentName);

        //卸载
        Intent intent = new Intent();
        intent.setAction(Intent.ACTION_DELETE);
        intent.setData(Uri.parse("package:"+getPackageName()));
        startActivity(intent);