Android编程获取系统隐藏服务实现锁屏的方法

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;
  @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。