EventBus事件总线库

最新推荐文章于 2024-11-17 17:11:53 发布

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本文介绍了如何使用EventBus库实现Android组件间的事件驱动通信。通过定义事件类、注册订阅者和发布事件，实现了在不同Activity间传递消息的功能。示例包括EventAActivity接收并显示来自EventBActivity的消息。

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GIthub官方地址：

https://github.com/greenrobot/EventBus

使用步骤

EventBus in 3 steps

Define events:
public class MessageEvent { /* Additional fields if needed */ }
Prepare subscribers
Register your subscriber (in your onCreate or in a constructor):
eventBus.register(this);

Declare your subscribing method:
@Subscribe
public void onEvent(AnyEventType event) {/* Do something */};
Post events:
eventBus.post(event)；

Gradle中添加一下代码：

 compile 'org.greenrobot:eventbus:3.0.0'

Maven:

<dependency>
    <groupId>org.greenrobot</groupId>
    <artifactId>eventbus</artifactId>
    <version>3.0.0</version>
</dependency>

测试如下：

public class EventAActivity extends Activity implements View.OnClickListener {

    private Button mButton;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_event_a);
        mButton = (Button) findViewById(R.id.event_button);
        EventBus.getDefault().register(this);
        mButton.setOnClickListener(this);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        EventBus.getDefault().unregister(this);
    }

    @Subscribe
    public void onEventMainThread(MessageEvent event) {
        Toast.makeText(EventAActivity.this, event.message, Toast.LENGTH_SHORT).show();
    }


    @Override
    public void onClick(View v) {
        if (v.getId() == R.id.event_button) {
            Intent intent = new Intent(this, EventBActivity.class);
            startActivity(intent);

        }
    }
}

另一个Activity

public class EventBActivity extends Activity implements View.OnClickListener {

    private Button mButton;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_event_b);
//        EventBus.getDefault().register(this);
        mButton = (Button) findViewById(R.id.event_b_button);
        mButton.setOnClickListener(this);
    }
    @Override
    protected void onDestroy() {
        super.onDestroy();
//        EventBus.getDefault().unregister(this);
    }

    @Override
    public void onClick(View v) {
        EventBus.getDefault().post(new MessageEvent("Hello everyone!"));
    }
}

当在BActivity中点击发送按钮的时候，可以把消息传递到AActivity中。