Android获取系统隐藏服务实现锁屏

Android获取系统隐藏服务实现锁屏

分类： Android 2011-10-21 11:46  640人阅读  评论(2)  收藏  举报

实现原理：当按锁屏键时，会发出一个广播，当界面接收到一个广播就可以实现锁频。我们可以调用IDevicePolicyManager服务中的lockNow方法来发送一个广播实现锁屏。

IDevicePolicyManager是被系统隐藏掉的，需要通过反射还获取此服务。

 步骤：

1.创建MyAdmin的广播接收者继承DeviceAdminReceiver

2.通过反射 ,获取IDevicePolicyManager服务 ，IDevicePolicyManager通过AIDL来获取出来。

3.注册广播接收者为admin设备

4.获取服务中的方法

效果图：

    

 

注册MyAdmin广播接收者：

 <receiver android:name=".MyAdmin">
     <meta-data android:name="android.app.device_admin"
         android:resource="@xml/my_admin" />
     <intent-filter>
         <action android:name="android.app.action.DEVICE_ADMIN_ENABLED" />
     </intent-filter>
 </receiver>

my_admin.xml：

 <?xml version="1.0" encoding="utf-8"?>
 <device-admin xmlns:android="http://schemas.android.com/apk/res/android">
         <uses-policies>
                 <limit-password />
                 <watch-login />
                 <reset-password />
                 <force-lock />
                 <wipe-data />
         </uses-policies>
 </device-admin>

反射获取服务、注册权限、实现锁屏：

 public class LockActivity extends Activity {
     IDevicePolicyManager mService;
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.main);
     }
     //锁屏
     public void lock(View view){
         try {
             //通过反射获取到sdk隐藏的服务
             Method method = Class.forName("android.os.ServiceManager")
                     .getMethod("getService", String.class);
             IBinder binder = (IBinder) method.invoke(null,//激活服务
                     new Object[] { Context.DEVICE_POLICY_SERVICE });
              mService = IDevicePolicyManager.Stub.asInterface(binder);

              //定义组件的名字
              ComponentName mAdminName = new ComponentName(this, MyAdmin.class);

              //注册权限
              if (mService != null) {
                     //判断自定义的广播接受者 是不是被注册成 deviceadmin的权限
                     if (!mService.isAdminActive(mAdminName)) {
                                 Intent intent = new Intent(
                                 DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);
                                 intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN,
                                         mAdminName);
                                 startActivity(intent);
                             }
                     //调用服务实现锁屏
                     mService.lockNow();
                     //设置解锁密码
                     mService.resetPassword("123", 0);
              }
         } catch (Exception e) {
             e.printStackTrace();
         }
     }
 }

AIDL:

 /*
 **
 ** Copyright 2010, The Android Open Source Project
 **
 ** Licensed under the Apache License, Version 2.0 (the "License");
 ** you may not use this file except in compliance with the License.
 ** You may obtain a copy of the License at
 **
 **     http://www.apache.org/licenses/LICENSE-2.0
 **
 ** Unless required by applicable law or agreed to in writing, software
 ** distributed under the License is distributed on an "AS IS" BASIS,
 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 ** See the License for the specific language governing permissions and
 ** limitations under the License.
 */

 package android.app.admin;

 import android.content.ComponentName;
 /**
  * Internal IPC interface to the device policy service.
  * {@hide}
  */
 interface IDevicePolicyManager {
     void setPasswordQuality(in ComponentName who, int quality);
     int getPasswordQuality(in ComponentName who);

     void setPasswordMinimumLength(in ComponentName who, int length);
     int getPasswordMinimumLength(in ComponentName who);

     boolean isActivePasswordSufficient();
     int getCurrentFailedPasswordAttempts();

     void setMaximumFailedPasswordsForWipe(in ComponentName admin, int num);
     int getMaximumFailedPasswordsForWipe(in ComponentName admin);

     boolean resetPassword(String password, int flags);

     void setMaximumTimeToLock(in ComponentName who, long timeMs);
     long getMaximumTimeToLock(in ComponentName who);

     void lockNow();

     void wipeData(int flags);

     void setActiveAdmin(in ComponentName policyReceiver);
     boolean isAdminActive(in ComponentName policyReceiver);
     List<ComponentName> getActiveAdmins();
     boolean packageHasActiveAdmins(String packageName);
     void removeActiveAdmin(in ComponentName policyReceiver);

     void setActivePasswordState(int quality, int length);
     void reportFailedPasswordAttempt();
     void reportSuccessfulPasswordAttempt();
 }