│  config.json #全局配置文件
│
├─idl
│  └─ohos
│      └─samples
│          └─serviceability
│                  IRemoteAgent.idl #提供远程接口idl文件
│
├─java
│  └─ohos
│      └─samples
│          └─serviceability
│              │  ForegroundServiceAbility.java #前台Service Ability
│              │  LocalServiceAbility.java #模拟本地的Service Ability
│              │  MainAbility.java	
│              │  RemoteAbility.java	#模拟远端的Service Ability
│              │
│              └─slice
│                      MainAbilitySlice.java #主能力页
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    "reqPermissions": [
      {
        "name": "ohos.permission.GET_DISTRIBUTED_DEVICE_INFO"
      },
      ...
      {
        "name": "ohos.permission.DISTRIBUTED_DATASYNC"
      }
    ]
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// Declare any non-default types here with sequenceable or interface statements

interface ohos.samples.serviceability.IRemoteAgent {
    /*
     * Demo service method use some parameters
     */
    void setRemoteObject([in] String param);
}
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private static final String DESCRIPTOR = "ohos.samples.serviceability.RemoteAbility";

//idl的服务端实现，
RemoteAgentStub remoteAgentStub = new RemoteAgentStub(DESCRIPTOR) {
    @Override
    public void setRemoteObject(String param) {
        HiLog.info(LABEL_LOG, "%{public}s", "setRemoteObject："+param);
        //不能这样，要用下面通知的方式
        //showTips(RemoteAbility.this, param);
        //赋值
        param_mess=param;
        //事件通知
        eventHandler.sendEvent(EVENT_ABILITY_MESS);

    }

};
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//IDL代理类
private  RemoteAgentProxy remoteAgentProxy;

/**
 * 连接 Service
 * @param isConnectRemote
 */
private void connectService(boolean isConnectRemote) {
    //三元表达式，判断连接本地还是远端Service
    Intent intent = isConnectRemote
            ? getRemoteServiceIntent(REMOTE_BUNDLE, REMOTE_SERVICE)
            : getLocalServiceIntent(LOCAL_BUNDLE, NORMAL_SERVICE);


    //连接 Service
    boolean isConnect=connectAbility(intent,connection);
    if (isConnect && remoteAgentProxy!=null) {
        try {
            //调用服务端IPC方法
            remoteAgentProxy.setRemoteObject("This param from client");
        } catch (RemoteException e) {
            HiLog.error(LABEL_LOG, "%{public}s", "onAbilityConnectDone RemoteException");
        }
    }

}

//建立连接，实例化代理对象
private IAbilityConnection connection = new IAbilityConnection() {
    @Override
    public void onAbilityConnectDone(ElementName elementName, IRemoteObject iRemoteObject, int resultCode) {
        //发个通知，Service 连接成功了
        eventHandler.sendEvent(EVENT_ABILITY_CONNECT_DONE);
        //实例化代理对象
        remoteAgentProxy = new RemoteAgentProxy(iRemoteObject);
    }

    @Override
    public void onAbilityDisconnectDone(ElementName elementName, int resultCode) {
        //发个通知，Service 断开连接了，主动断开不会执行，关闭服务端会执行
        eventHandler.sendEvent(EVENT_ABILITY_DISCONNECT_DONE);
    }
};

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"reqPermissions": [
      {
        "name": "ohos.permission.KEEP_BACKGROUND_RUNNING"
      },
      ...
    ]
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//通知ID
private static final int NOTIFICATION_ID = 0XD0000002;

@Override
protected void onStart(Intent intent) {
    //调用方法
    startForeground();
    super.onStart(intent);
}

@Override
protected void onStop() {
    super.onStop();
    //取消此功能的后台运行以释放系统内存。
    cancelBackgroundRunning();
}


/**
 * 在后台保留此服务能力并显示通知栏。
 */
private void startForeground() {
    HiLog.info(LABEL_LOG, "startForeground");

    //任务栏显示通知
    NotificationRequest request = new NotificationRequest(NOTIFICATION_ID).setTapDismissed(true);
    //
    NotificationRequest.NotificationNormalContent content = new NotificationRequest.NotificationNormalContent();

    content.setTitle("SD card存储卡已意外移除").setText("请先卸载存储卡，再将其移除，以防数据丢失");
    content.setAdditionalText("21分钟前");
    //设置通知栏内容
    NotificationRequest.NotificationContent notificationContent = new NotificationRequest.NotificationContent(content);
    request.setContent(notificationContent);

    //在后台保留此服务能力并显示通知栏。
    keepBackgroundRunning(NOTIFICATION_ID, request);

}
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//定义事件ID
private static final int EVENT_ABILITY_CONNECT_DONE = 0x1000001;
private static final int EVENT_ABILITY_DISCONNECT_DONE = 0x1000002;


private EventHandler eventHandler = new EventHandler(EventRunner.current()) {
        @Override
        protected void processEvent(InnerEvent event) {
            switch (event.eventId) {
                case EVENT_ABILITY_CONNECT_DONE:
                    showTips(MainAbilitySlice.this, "Service connect succeeded");
                    break;
                case EVENT_ABILITY_DISCONNECT_DONE:
                    showTips(MainAbilitySlice.this, "Service disconnect succeeded");
                    break;
                default:
                    break;
            }
        }
    };


//发个通知，Service 连接成功了
eventHandler.sendEvent(EVENT_ABILITY_CONNECT_DONE);
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