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本文实例讲述了Android编程获取系统隐藏服务实现锁屏的方法。分享给大家供大家参考,具体如下:
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;@Overridepublic 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();}
希望本文所述对大家Android程序设计有所帮助。