1，创建类DeviceAdminReceiver的子类

如：com.itydl.lockscreen.DeviceAdminSample

2，在清单文件中配置广播接收者

<receiver
        android:name="com.itydl.lockscreen.DeviceAdminSample"
        android:description="@string/sample_device_admin_description"
        android:label="@string/sample_device_admin"
        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，配置字符串相关信息

 <string name="activity_sample_device_admin">设备管理员</string>
<string name="sample_device_admin">管理员</string>
<string name="sample_device_admin_description">开启设备管理员，不开启扣2000块</string>

4，在res目录下创建xml文件夹，在该文件夹下创建deviceadminsample.xml文件，内容：

   <device-admin xmlns:android="http://schemas.android.com/apk/res/android">
  <uses-policies>
    <limit-password />
    <watch-login />
    <reset-password />
    <force-lock />
    <wipe-data />
    <expire-password />
    <encrypted-storage />
    <disable-camera />
  </uses-policies>
</device-admin>

5，在代码中创建设备管理器和组件

dpm = (DevicePolicyManager) getSystemService(DEVICE_POLICY_SERVICE);
    ComponentName who = new ComponentName(this, DeviceAdminSample.class);

6，写功能

dpm.lockNow();一键锁屏

 <string name="activity_sample_device_admin">设备管理员</string>
<string name="sample_device_admin">管理员</string>
<string name="sample_device_admin_description">开启设备管理员，不开启扣2000块</string>

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.itydl.lockscreen"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        
        <activity
            android:name="com.itydl.lockscreen.MainActivity"
            android:label="一键锁屏" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>


        <receiver
            android:name="com.itydl.lockscreen.DeviceAdminSample"
            android:description="@string/sample_device_admin_description"
            android:label="@string/sample_device_admin"
            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>

    </application>

</manifest>

package com.itydl.lockscreen;

import android.os.Bundle;
import android.app.Activity;
import android.app.admin.DevicePolicyManager;
import android.content.ComponentName;
import android.content.Intent;
import android.view.Menu;
import android.view.View;

public class MainActivity extends Activity {

	private DevicePolicyManager dmp;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		dmp = (DevicePolicyManager) getSystemService(DEVICE_POLICY_SERVICE);
	}

	/**
	 * 一键锁屏
	 * 
	 * @param v
	 */
	public void lockScreen(View v) {
		// 如果没有激活设备管理员，提醒用户做事
		ComponentName who = new ComponentName(this, DeviceAdminSample.class);
		if (dmp.isAdminActive(who)) {// true表示已经激活
			dmp.lockNow();// 一键锁屏

		} else {
			/**根据官方文档，写出启动设备管理器的活动
			 * // Launch the activity to have the user enable our admin. Intent
			 * intent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);
			 * intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN,
			 * mDeviceAdminSample);
			 * intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION,
			 * mActivity.getString(R.string.add_admin_extra_app_text));
			 * startActivityForResult(intent, REQUEST_CODE_ENABLE_ADMIN);
			 */
			
			Intent intent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);
			intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN,
					 who);
			intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION,
					  "设备管理器。。。");
			startActivityForResult(intent, 1);
		}
	}

}