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：
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<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>
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my_admin.xml：
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<?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>
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反射获取服务、注册权限、实现锁屏：
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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();
}
}
}
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aidl:
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/*
**
** 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();
}
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希望本文所述对大家android程序设计有所帮助。