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<activity android:name=".app.DeviceAdminSample"

            android:label="@string/activity_sample_device_admin">

    <intent-filter>

        <action android:name="android.intent.action.MAIN" />

        <category android:name="android.intent.category.SAMPLE_CODE" />

    </intent-filter>

</activity>

<receiver android:name=".app.DeviceAdminSample$DeviceAdminSampleReceiver" 注：DeviceAdminReceiver 的子类

        android:label="@string/sample_device_admin"

        android:description="@string/sample_device_admin_description"

        android:permission="android.permission.BIND_DEVICE_ADMIN">      注：绑定权限

    <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" />  注：设备管理员权限是否可用

    </intent-filter>

</receiver>

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public class MyAdminReceiver extends DeviceAdminReceiver {

}

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<receiver android:name=".app.DeviceAdminSample$DeviceAdminSampleReceiver"

        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>

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

<device-admin xmlns:android="http://schemas.android.com/apk/res/android">

  <uses-policies>       用户可以使用到的一些策略标签

    <limit-password />   设置密码规则的一些策略

    <watch-login />      在解屏的时候可以看到它解屏的过程

    <reset-password />   从新设置密码，在锁屏之前可以写一段代码设置解屏代码

    <force-lock />       强制锁屏     

    <wipe-data />        清除数据

    <expire-password />  设置密码在什么时候过期

    <encrypted-storage />  加密存储

    <disable-camera />   关闭相机

  </uses-policies>

</device-admin>

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public class MainActivity extends Activity {

    private DevicePolicyManager dpm;

    private ComponentName cn;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        //在系统服务中获得设备管理员

        dpm = (DevicePolicyManager) getSystemService(DEVICE_POLICY_SERVICE);

        cn = new ComponentName(this, MyAdminReceiver.class);//注：设备管理员类的class这里写的设备管理员类是：MyAdminReceiver

    }

    public void lockScreen(View view){

        //判断当前管理员策略是否被激活

        boolean active = dpm.isAdminActive(cn);

        if(active){

            dpm.lockNow();//调用一键锁屏功能

            dpm.resetPassword("1234", 0);//设置解屏密码

        }else{

            //激活管理员策略

             openAmin();

        }

    }

    /**

     * 激活管理员策略

     */

    private void openAmin() {

        Intent intent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);

         intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN, cn);

         intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION,

                 "开启管理员策略之后，可以一键锁屏、远程删除数据");

         //打开激活管理员策略的界面

         startActivity(intent);

    }

}