HarmonyOS應用開發(fā)-FA調用PA能力學習分享

1、HarmonyOS應用開發(fā)-FA調用PA能力學習分享在鴻蒙開發(fā)中，頁面交互時有時候需要調用后臺PA的能力，比如數據獲取、控制后臺等，下面介紹如何做到上述情況。相關接口：FA端提供以下三個JS接口：FeatureAbility.callAbility(OBJECT)：調用PA能力。FeatureAbility.subscribeAbilityEvent(OBJECT, Function)：訂閱PA能力。FeatureAbility.unsubscribeAbilityEvent(OBJECT)：取消訂閱PA能力。PA端提供以下兩類接口：IRemoteObject.onRemoteRequest(

2、int, MessageParcel, MessageParcel, MessageOption)：Ability調用方式，FA使用遠端進程通信拉起并請求PA服務。AceInternalAbility.AceInternalAbilityHandler.onRemoteRequest(int, MessageParcel, MessageParcel, MessageOption)：Internal Ability調用方式，采用內部函數調用的方式和FA進行通信。使用演示：FA：/ abilityType: 0-Ability; 1-Internal Abilityconst ABILITY_T

3、YPE_EXTERNAL = 0;const ABILITY_TYPE_INTERNAL = 1;/ syncOption(Optional, default sync): 0-Sync; 1-Asyncconst ACTION_SYNC = 0;const ACTION_ASYNC = 1;const ACTION_MESSAGE_CODE_PLUS = 1001;export default plus: async function() var actionData = ; actionData.firstNum = 1024; actionData.secondNum = 2048; v

4、ar action = ; action.bundleName = com.example.hiaceservice; action.abilityName = com.example.hiaceservice.ComputeServiceAbility; action.messageCode = ACTION_MESSAGE_CODE_PLUS; action.data = actionData; action.abilityType = ABILITY_TYPE_EXTERNAL; action.syncOption = ACTION_SYNC; var result = await Fe

5、atureAbility.callAbility(action); var ret = JSON.parse(result); if (ret.code = 0) (plus result is: + JSON.stringify(ret.abilityResult); else console.error(plus error code: + JSON.stringify(ret.code); PA:package com.example.hiaceservice;/ ohos相關接口包import ohos.aafwk.ability.Ability;import ohos.aafwk.c

6、ontent.Intent;import ohos.hiviewdfx.HiLog;import ohos.hiviewdfx.HiLogLabel;import ohos.rpc.IRemoteBroker;import ohos.rpc.IRemoteObject;import ohos.rpc.RemoteObject;import ohos.rpc.MessageParcel;import ohos.rpc.MessageOption;import ohos.utils.zson.ZSONObject;import java.util.HashMap;import java.util.

7、Map; public class ComputeServiceAbility extends Ability / 定義日志標簽 private static final HiLogLabel LABEL = new HiLogLabel(HiLog.LOG_APP, 0, MY_TAG); private MyRemote remote = new MyRemote(); / FA在請求PA服務時會調用Ability.connectAbility連接PA，連接成功后，需要在onConnect返回一個remote對象，供FA向PA發(fā)送消息 Override protected IRemoteO

8、bject onConnect(Intent intent) super.onConnect(intent); return remote.asObject(); class MyRemote extends RemoteObject implements IRemoteBroker private static final int SUCCESS = 0; private static final int ERROR = 1; private static final int PLUS = 1001; MyRemote() super(MyService_MyRemote); Overrid

9、e public boolean onRemoteRequest(int code, MessageParcel data, MessageParcel reply, MessageOption option) switch (code) case PLUS: String dataStr = data.readString(); RequestParam param = new RequestParam(); try param = ZSONObject.stringToClass(dataStr, RequestParam.class); catch (RuntimeException e

10、) HiLog.error(LABEL, convert failed.); / 返回結果當前僅支持String，對于復雜結構可以序列化為ZSON字符串上報 Map result = new HashMap(); result.put(code, SUCCESS); result.put(abilityResult, param.getFirstNum() + param.getSecondNum(); reply.writeString(ZSONObject.toZSONString(result); break; default: Map result = new HashMap(); result.put(abilityError