鴻蒙 JS FA 呼叫java PA簡單實體

核心：

• 是通過FeatureAbility.callAbility(OBJECT)介面呼叫的，

一. Java PA 端

需要繼承 Ability，重寫 onConnect 方法并回傳 RemoteObject物件，業務邏輯在RemoteObject 的onRemoteRequest方法中處理，代碼如下：

public class DemoService extends Ability {


    MyRemote myRemote = new MyRemote();
    //日志
    private static final HiLogLabel LABEL_LOG = new HiLogLabel(3, 0xD001100, "Demo");


    @Override
    protected IRemoteObject onConnect(Intent intent) {
        
        //回傳RemoteObject的物件
        return myRemote.asObject();
    }

    class MyRemote extends RemoteObject implements IRemoteBroker {

        public MyRemote() {
            super("descriptor");
        }

        @Override
        public boolean onRemoteRequest(int code, MessageParcel data, MessageParcel reply,MessageOption option) throws RemoteException {
            

            return true;
        }

        @Override
        public IRemoteObject asObject() {
            return this;
        }
    }
}

注意寫完service類以后，需要 config.json 中注冊service類，代碼如下：

"abilities": [
      {
        "skills": [
          {
            "entities": [
              "entity.system.home"
            ],
            "actions": [
              "action.system.home"
            ]
          }
        ],
        "visible": true,
        "name": "com.jiakejian.myapplication.MainAbility",
        "icon": "$media:icon",
        "description": "$string:mainability_description",
        "label": "$string:entry_MainAbility",
        "type": "page",
        "launchType": "standard"
      },
      {
        "name": "com.jiakejian.myapplication.DemoService",
        "icon": "$media:icon",
        "description": "DemoService",
        "type": "service"
      }
    ],

二.JS FA端

簡單寫了一個hml頁面，添加了一個點擊事件：

<div class="container">

    <button class="title" @click="onClick">
        向java FA傳遞資料
    </button>
</div>

js中需要添加 action 物件，相當于javaFA跳轉中的intent ，并設為 異步方法，代碼如下：

onClick:async function(){

        //要傳遞的資料
        var data = {
            id:"001",
            name:"xiaoli"
        }
        //action物件，相當于intent
        var action = {};

        //添加service所在的包名
        action.bundleName = 'com.jiakejian.myapplication';
        
        //添加service的類名
        action.abilityName = 'com.jiakejian.myapplication.DemoService';

        //添加messageCode ，用于區分其他的action
        action.messageCode = 100;

        //添加資料
        action.data = data;
        
        //跳轉的activity的型別，0代表service
        action.abilityType = 0;

        //最重要的一步：跳轉
        var str = await FeatureAbility.callAbility(action);

        //下面是處理 java FA 回傳的資料
         var result = JSON.parse(str);
        console.log(result.id);
        console.log(result.name);
    }

三 .Java FA端 在RemoteObject物件的 onRemoteRequest方法中 處理資料并回傳資料，代碼如下：

         @Override
        public boolean onRemoteRequest(int code, MessageParcel data, MessageParcel reply,MessageOption option) throws RemoteException {
            switch (code) {
                case 100:
                    String str = data.readString();
                    HiLog.info(LABEL_LOG, "str:"+str);
                    
                    //添加回傳資料
                    Map<String, Object> result = new HashMap<String, Object>();
                    result.put("id", "002");
                    result.put("name", "xiaohuang");
                    reply.writeString(ZSONObject.toZSONString(result));
                    break;
                default:
                    return false;
            }
            return true;
        }

執行結果如下：