# inter-app communication

**Repository Path**: cxshu/inter-app-communication

## Basic Information

- **Project Name**: inter-app communication
- **Description**: 跨应用通信，实现了不同应用之间对公共事件的发布和订阅。
- **Primary Language**: Unknown
- **License**: Not specified
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2022-02-01
- **Last Updated**: 2022-02-01

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

我们在entry模块中订阅公共事件
修改entry模块下的MainAbilitySlice代码如下
```
public class MainAbilitySlice extends AbilitySlice {
// 自定义公共事件的名称
static final String EVENT_ACTION = "com.cxs.commoneventtest.event";
// Intent传递数据的Key
static final String INTENT_PARAM_KEY = "intent.param.key";
static boolean isSubscribe = false;

    @Override
    public void onStart(Intent intent) {
        super.onStart(intent);
        super.setUIContent(ResourceTable.Layout_ability_main);
        findComponentById(ResourceTable.Id_text_helloworld).setClickedListener(this::subscribe);
    }

    private void subscribe(Component component) {
            if (isSubscribe) {
                return;
            }
            MatchingSkills matchingSkills = new MatchingSkills();
            matchingSkills.addEvent(EVENT_ACTION);
            CommonEventSubscribeInfo subscribeInfo = new CommonEventSubscribeInfo(matchingSkills);
            CommonEventSubscriber subscriber = new CommonEventSubscriber(subscribeInfo) {
                @Override
                public void onReceiveEvent(CommonEventData commonEventData) {
                    Intent intent = commonEventData.getIntent();
                    int intParam = intent.getIntParam(INTENT_PARAM_KEY, -1);
                    System.out.println("onReceiveEvent:" + intParam);
                }
            };
            try {
                // 订阅公共事件
                CommonEventManager.subscribeCommonEvent(subscriber);
                isSubscribe = true;
                System.out.println("订阅公共事件成功！");
            } catch (RemoteException e) {
                e.printStackTrace();
            }
    }
}
```



新建一个entry模块，名称为entry2，我们在entry2模块中发布公共事件
修改MainAbilitySlice代码如下
```
public class MainAbilitySlice extends AbilitySlice {
// 这里的公共事件的名称必须和entry模块的一样
static final String EVENT_ACTION = "com.cxs.commoneventtest.event";
static final String INTENT_PARAM_KEY = "intent.param.key";

    @Override
    public void onStart(Intent intent) {
        super.onStart(intent);
        super.setUIContent(ResourceTable.Layout_ability_main);

        findComponentById(ResourceTable.Id_text_helloworld).setClickedListener(this::publishEvent);
    }

    /**
     * 发布公共事件
     * @param component
     */
    private void publishEvent(Component component) {
        // 1. 构建一个Intent对象，包含了自定义的事件的标识符
        Intent intent = new Intent();
        Operation operation = new Intent.OperationBuilder()
                .withAction(EVENT_ACTION)     // 自定义的事件标识符
                .build();
        intent.setOperation(operation);
        intent.setParam(INTENT_PARAM_KEY, "Hello HarmonyOS");

        // 2. 构建CommonEventData对象
        CommonEventData commonEventData = new CommonEventData(intent);

        // 3. 核心的发布事件的动作
        try {
            CommonEventManager.publishCommonEvent(commonEventData);
            System.out.println("发布事件结束");
        } catch (RemoteException e) {
            e.printStackTrace();
        }
    }
}
```