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)
1 package com.example.wangshibang.screenlock; 2 3 import android.app.Activity; 4 import android.app.admin.DevicePolicyManager; 5 import ponentName; 6 import android.content.Context; 7 import android.content.Intent; 8 import android.os.Bundle; 9 10 /**11 * Created by wangshibang on -11-8.12 */13 public class Main extends Activity {14private DevicePolicyManager policyManager;//管理和操作设备的API15private ComponentName componentName;//打开其他应用程序中的Activity或服务16 17@Override18protected void onCreate(Bundle savedInstanceState) {19 super.onCreate(savedInstanceState);20 setContentView(R.layout.activity_main);21 22 //获取设备管理服务23 policyManager = (DevicePolicyManager)getSystemService(Context.DEVICE_POLICY_SERVICE);24 //AdminReceiver 继承自 DeviceAdminReceiver25 componentName = new ComponentName(this, AdminReceiver.class);26 27 //主方法28 myLock();29 30 //killMyself ，锁屏之后就立即kill掉我们的Activity，避免资源的浪费31 android.os.Process.killProcess(android.os.Process.myPid());32}33 34private void myLock(){35 boolean isActive = policyManager.isAdminActive(componentName);36 if(!isActive){37 //若没有权限就去获取权限38 activeManage();39 40 return;41 //锁屏42 //policyManager.lockNow();43 }44 else {45 policyManager.lockNow();46 }47}48 49private void activeManage(){50 //启动设备管理(隐式Intent) - 在AndroidManifest.xml中设定相应过滤器51 Intent intent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);52 //权限列表53 intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN, componentName);54 //描述(additional explanation)55 intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION, "----Other Description----");56 startActivityForResult(intent, 0);57}58 }
AdminReceiver.java
1 package com.example.wangshibang.screenlock; 2 3 import android.app.admin.DeviceAdminReceiver; 4 import android.content.Context; 5 import android.content.Intent; 6 import android.content.SharedPreferences; 7 import android.widget.Toast; 8 9 /**10 * Created by wangshibang on -11-8.11 */12 public class AdminReceiver extends DeviceAdminReceiver {13 14public static SharedPreferences getDevicePreference(Context context){15 //获取设备存储的数值16 return context.getSharedPreferences(DeviceAdminReceiver.class.getName(),0);17}18 19// 密码的特点20public static String PREF_PASSWORD_QUALITY = "password_quality";21// 密码的长度22public static String PREF_PASSWORD_LENGTH = "password_length";23 24public static String PREF_MAX_FAILED_PW = "max_failed_pw";25 26void showToast(Context context, CharSequence text) {27 Toast.makeText(context, text, Toast.LENGTH_SHORT).show();28}29 30@Override31public void onEnabled(Context context, Intent intent) {32 // TODO Auto-generated method stub33 showToast(context, "设备管理：可用");34}35 36@Override37public void onDisabled(Context context, Intent intent) {38 // TODO Auto-generated method stub39 showToast(context, "Deactive successful!");40}41 42@Override43public CharSequence onDisableRequested(Context context, Intent intent) {44 // TODO Auto-generated method stub45 return "Are you sure want to Deactive？";46}47 48@Override49public void onPasswordChanged(Context context, Intent intent) {50 // TODO Auto-generated method stub51 showToast(context, "设备管理：密码己经改变");52}53 54@Override55public void onPasswordFailed(Context context, Intent intent) {56 // TODO Auto-generated method stub57 showToast(context, "设备管理：改变密码失败");58}59 60@Override61public void onPasswordSucceeded(Context context, Intent intent) {62 // TODO Auto-generated method stub63 showToast(context, "设备管理：改变密码成功");64}65 }
AndroidManifest.xml
1 <?xml version="1.0" encoding="utf-8"?> 2 <manifest xmlns:android="/apk/res/android" 3package="com.example.wangshibang.screenlock"> 4 5<application 6 android:allowBackup="true" 7 android:icon="@mipmap/lock" 8 android:label="@string/app_name" 9 android:supportsRtl="true"10 android:theme="@style/AppTheme">11 <activity android:name=".Main"12 android:label="@string/app_name"13 android:theme="@android:style/Theme.NoDisplay">14 <intent-filter>15 <action android:name="android.intent.action.MAIN" />16 <category android:name="android.intent.category.LAUNCHER" />17 </intent-filter>18 </activity>19 <!-- 设备管理 -->20 <receiver21 android:name=".AdminReceiver"22 android:label="ScreenLock"23 android:permission="android.permission.BIND_DEVICE_ADMIN">24 <meta-data25 android:name="android.app.device_admin"26 android:resource="@xml/lock_screen" />27 <intent-filter>28 <action android:name="android.app.action.DEVICE_ADMIN_ENABLED" />29 </intent-filter>30 </receiver>31</application>32 33 </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
1 <?xml version="1.0" encoding="utf-8"?> 2 <device-admin xmlns:android="/apk/res/android"> 3<uses-policies> 4 <!-- 强行锁定 在里仅这个是需要的--> 5 <force-lock /> 6 <!-- 清除所有数据（恢复出厂设置） --> 7 <wipe-data /> 8 <!-- 重置密码 --> 9 <reset-password />10 <!-- 限制密码选择 -->11 <limit-password />12 <!-- 监控登录尝试 -->13 <watch-login />14</uses-policies>15 </device-admin>
最后是什么都没有的activity_main.xml文件
1 <?xml version="1.0" encoding="utf-8"?>2 <LinearLayout xmlns:android="/apk/res/android"3android:orientation="vertical" android:layout_width="match_parent"4android:layout_height="match_parent">5 6 </LinearLayout>
楼主才疏学浅，不喜勿喷
最后附上源码的链接：链接：/s/1i5x5s6x 密码：es42
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