Android编程程序实现一键锁屏的方法讲解

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:tools="http://schemas.android.com/tools"  android:layout_width="match_parent"  android:layout_height="match_parent"  tools:context=".MainActivity" >  <Button    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:onClick="openAdmin"    android:text="开启管理员权限" />  <Button    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:layout_centerInParent="true"    android:onClick="lockscreen"    android:text="一键锁屏" />  <Button    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:layout_alignParentBottom="true"    android:onClick="uninstall"    android:text="卸载软件" /></RelativeLayout>

package com.xuliugen.lockscreen;import com.itheima.lockscreen.R;import android.app.Activity;import android.app.admin.DevicePolicyManager;import android.content.ComponentName;import android.content.Intent;import android.net.Uri;import android.os.Bundle;import android.view.View;import android.widget.Toast;public class MainActivity extends Activity {  /**   * 设备策略服务   */  private DevicePolicyManager dpm;  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    dpm = (DevicePolicyManager) getSystemService(DEVICE_POLICY_SERVICE);  }  /**   * 用代码去开启管理员   */  public void openAdmin(View view) {    // 创建一个Intent    Intent intent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);    // 我要激活谁    ComponentName mDeviceAdminSample = new ComponentName(this,MyAdmin.class);    intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN,mDeviceAdminSample);    // 劝说用户开启管理员权限    intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION,"哥们开启我可以一键锁屏，你的按钮就不会经常失灵");    startActivity(intent);  }  /**   * 一键锁屏   */  public void lockscreen(View view) {    ComponentName who = new ComponentName(this, MyAdmin.class);    if (dpm.isAdminActive(who)) {      dpm.lockNow();// 锁屏      dpm.resetPassword("", 0);// 设置屏蔽密码      // 清除Sdcard上的数据      // dpm.wipeData(DevicePolicyManager.WIPE_EXTERNAL_STORAGE);      // 恢复出厂设置      // dpm.wipeData(0);    } else {      Toast.makeText(this, "还没有打开管理员权限", 1).show();      return;    }  }  /**   * 卸载当前软件   */  public void uninstall(View view) {    // 1.先清除管理员权限    ComponentName mDeviceAdminSample = new ComponentName(this,        MyAdmin.class);    dpm.removeActiveAdmin(mDeviceAdminSample);    // 2.普通应用的卸载    Intent intent = new Intent();    intent.setAction("android.intent.action.VIEW");    intent.addCategory("android.intent.category.DEFAULT");    intent.setData(Uri.parse("package:" + getPackageName()));    startActivity(intent);  }}

package com.xuliugen.lockscreen;import android.app.admin.DeviceAdminReceiver;/** * 特殊的广播接收者 * @author xuliugen */public class MyAdmin extends DeviceAdminReceiver {}

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"  package="com.xuliugen.lockscreen"  android:versionCode="1"  android:versionName="1.0" >  <uses-sdk    android:minSdkVersion="10"    android:targetSdkVersion="16" />  <application    android:allowBackup="true"    android:icon="@drawable/ic_launcher"    android:label="@string/app_name"    android:theme="@style/AppTheme" >    <activity      android:name="com.xuliugen.lockscreen.MainActivity"      android:label="@string/app_name" >      <intent-filter>        <action android:name="android.intent.action.MAIN" />        <category android:name="android.intent.category.LAUNCHER" />      </intent-filter>    </activity>    <!-- 广播接收者 -->    <receiver      android:name="com.xuliugen.lockscreen.MyAdmin"      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>