Android获取系统隐藏服务实现锁屏

 

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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();
}