在android framework中添加自定义系统服务

添加系统服务需要添加aidl,service,manager文件,需要修改SystemServer,Context,ContextImpl

下面举例进行说明,主要添加一个服务,用于获取系统时间和版本号

1.在frameworks/base/core/java/android/app/下添加aidl文件

frameworks/base/core/java/android/app/ISystemStatusManager.aidl

package android.app;interface ISystemStatusManager{    String[] getSystemStatus();}

2.修改frameworks/base/Android.mk文件,将aidl加到该文件中,这样才可以被编译到,否则编译不过

将core/java/android/app/ISystemStatusManager.aidl \加到LOCAL_SRC_FILES后面

3.在frameworks/base/services/core/java/com/android/server/下添加service文件

frameworks/base/services/core/java/com/android/server/SystemStatusManagerService.java

package com.android.server;import android.app.ISystemStatusManager;import android.content.Context;import android.os.Build;import android.util.Slog;import java.text.SimpleDateFormat;import java.util.Date;public class SystemStatusManagerService extends ISystemStatusManager.Stub {    private Context mContext;    public SystemStatusManagerService(Context context) {        mContext = context;        Slog.d("SystemStatus", "Date:" + getDateTime() + "\nVersion:" + getVersion());    }    @Override    public String[] getSystemStatus() {        String[] infos = new String[2];        infos[0] = "Date:" + getDateTime();        infos[1] = "Version:" + getVersion();        return infos;    }    private String getDateTime() {        SimpleDateFormat format = new SimpleDateFormat("yyyy-DD-mm HH:mm:s");        Date date = new Date(System.currentTimeMillis());        return format.format(date);    }    private String getVersion() {        return Build.DISPLAY;    }}

4.在frameworks/base/core/java/android/app/下添加manager

frameworks/base/core/java/android/app/SystemStatusManager.java

package android.app;import android.content.Context;import android.os.RemoteException;import android.util.Slog;public class SystemStatusManager {    Context mContext;    ISystemStatusManager mService;    public SystemStatusManager(Context context, ISystemStatusManager service) {        mContext = context;        mService = service;    }    public String[] getSystemStatus() {        if (mService != null) {            try {                return mService.getSystemStatus();            } catch (RemoteException e) {                Slog.e("SystemStatus", "RemoteException " + e);                return null;            }        }        return null;    }}

5.在frameworks/base/core/java/android/content/Context.java中添加service名称定义

public static final String SYSTEM_STATUS_SERVICE = "system_status_service";

6.在frameworks/base/services/java/com/android/server/SystemServer.java中添加服务

在startOtherServices()方法中添加如下代码

try {    ServiceManager.addService(Context.SYSTEM_STATUS_SERVICE, new SystemStatusManagerService(context));} catch (Throwable e) {    Slog.e(TAG, "Failure starting System Status Service ", e);}

7.在frameworks/base/core/java/android/app/ContextImpl.java中注册服务

在static {}中添加如下代码

registerService(SYSTEM_STATUS_SERVICE, new ServiceFetcher() {    public Object createService(ContextImpl ctx) {        IBinder b = ServiceManager.getService(SYSTEM_STATUS_SERVICE);        return new SystemStatusManager(ctx, ISystemStatusManager.Stub.asInterface(b));    }});

8.编译framework.jar和services.jar,push到手机,重启手机

重启手机后就会输出如下log:

D/SystemStatus(  910): Date:2017-01-00 00:00:13D/SystemStatus(  910): Version:xxx

9.如果系统app需要使用该service,可以通过如下方式调用

SystemStatusManager mManager = (SystemStatusManager) getSystemService(Context.SYSTEM_STATUS_SERVICE);try {    String[] infos = mManager.getSystemStatus();    Log.i("SystemStatus", "SystemStatus Date:" + infos[0] + "\nVersion:" + infos[1]);} catch (Exception e) {    e.printStackTrace();}

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