Android锁屏软件

需求描述：锁屏软件就是点击应用然后直接锁屏，不会弹出任何界面

设计思路：应用启动以后通过getSystemService获取系统的服务，调用安卓系统的DevicePolicyManager和ComponentName来对系统进行操作，先判断用户是否有相应的权限，如果有，直接锁屏，如果没有就先获取系统权限，再锁屏

废话不说，直接上代码

Main.java(主页面)

 package com.example.wangshibang.screenlock;

 import android.app.Activity;
 import android.app.admin.DevicePolicyManager;
 import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
 import android.os.Bundle;

 /**
  * Created by wangshibang on 2016-11-8.
  */
 public class Main extends Activity {
     private DevicePolicyManager policyManager;//管理和操作设备的API
     private ComponentName componentName;//打开其他应用程序中的Activity或服务

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);

         //获取设备管理服务
         policyManager = (DevicePolicyManager)getSystemService(Context.DEVICE_POLICY_SERVICE);
         //AdminReceiver 继承自 DeviceAdminReceiver
         componentName = new ComponentName(this, AdminReceiver.class);

         //主方法
         myLock();

         //killMyself ，锁屏之后就立即kill掉我们的Activity，避免资源的浪费
         android.os.Process.killProcess(android.os.Process.myPid());
     }

     private void myLock(){
         boolean isActive = policyManager.isAdminActive(componentName);
         if(!isActive){
             //若没有权限就去获取权限
             activeManage();

             return;
             //锁屏
             //policyManager.lockNow();
         }
         else {
             policyManager.lockNow();
         }
     }

     private void activeManage(){
         //启动设备管理(隐式Intent) - 在AndroidManifest.xml中设定相应过滤器
         Intent intent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);
         //权限列表
         intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN, componentName);
         //描述(additional explanation)
         intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION, "----Other Description----");
         startActivityForResult(intent, 0);
     }
 }

AdminReceiver.java

 package com.example.wangshibang.screenlock;

 import android.app.admin.DeviceAdminReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.widget.Toast;

 /**
  * Created by wangshibang on 2016-11-8.
  */
 public class AdminReceiver extends DeviceAdminReceiver {

     public static SharedPreferences getDevicePreference(Context context){
         //获取设备存储的数值
         return context.getSharedPreferences(DeviceAdminReceiver.class.getName(),0);
     }

     // 密码的特点
     public static String PREF_PASSWORD_QUALITY = "password_quality";
     // 密码的长度
     public static String PREF_PASSWORD_LENGTH = "password_length";

     public static String PREF_MAX_FAILED_PW = "max_failed_pw";

     void showToast(Context context, CharSequence text) {
         Toast.makeText(context, text, Toast.LENGTH_SHORT).show();
     }

     @Override
     public void onEnabled(Context context, Intent intent) {
         // TODO Auto-generated method stub
         showToast(context, "设备管理：可用");
     }

     @Override
     public void onDisabled(Context context, Intent intent) {
         // TODO Auto-generated method stub
         showToast(context, "Deactive successful!");
     }

     @Override
     public CharSequence onDisableRequested(Context context, Intent intent) {
         // TODO Auto-generated method stub
         return "Are you sure want to Deactive？";
     }

     @Override
     public void onPasswordChanged(Context context, Intent intent) {
         // TODO Auto-generated method stub
         showToast(context, "设备管理：密码己经改变");
     }

     @Override
     public void onPasswordFailed(Context context, Intent intent) {
         // TODO Auto-generated method stub
         showToast(context, "设备管理：改变密码失败");
     }

     @Override
     public void onPasswordSucceeded(Context context, Intent intent) {
         // TODO Auto-generated method stub
         showToast(context, "设备管理：改变密码成功");
     }
 }

AndroidManifest.xml

 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.example.wangshibang.screenlock">

     <application
         android:allowBackup="true"
         android:icon="@mipmap/lock"
         android:label="@string/app_name"
         android:supportsRtl="true"
         android:theme="@style/AppTheme">
         <activity android:name=".Main"
             android:label="@string/app_name"
             android:theme="@android:style/Theme.NoDisplay">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
         <!-- 设备管理 -->
         <receiver
             android:name=".AdminReceiver"
             android:label="ScreenLock"
             android:permission="android.permission.BIND_DEVICE_ADMIN">
             <meta-data
                 android:name="android.app.device_admin"
                 android:resource="@xml/lock_screen" />
             <intent-filter>
                 <action android:name="android.app.action.DEVICE_ADMIN_ENABLED" />
             </intent-filter>
         </receiver>
     </application>

 </manifest>

res文件夹下建一个xml文件夹，里面有个lock_screen.xml文件

lock_screen.xml

 <?xml version="1.0" encoding="utf-8"?>
 <device-admin xmlns:android="http://schemas.android.com/apk/res/android">
     <uses-policies>
         <!-- 强行锁定  在里仅这个是需要的-->
         <force-lock />
         <!-- 清除所有数据（恢复出厂设置） -->
         <wipe-data />
         <!-- 重置密码 -->
         <reset-password />
         <!-- 限制密码选择 -->
         <limit-password />
         <!-- 监控登录尝试 -->
         <watch-login />
     </uses-policies>
 </device-admin>

最后是什么都没有的activity_main.xml文件

 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:orientation="vertical" android:layout_width="match_parent"
     android:layout_height="match_parent">

 </LinearLayout>

楼主才疏学浅，不喜勿喷

最后附上源码的链接：链接：http://pan.baidu.com/s/1i5x5s6x 密码：es42