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：

<"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(); }

希望本文所述对大家Android程序设计有所帮助。