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>