片段之间的通信

问题描述

我有默认的主从流动，这是创建新的项目时自动创建。我的问题是。当我添加一个按钮，细节的一面。有没有办法通过pressing该按钮来更新我的名单身边？换句话说，可以ItemDetailFragment和ItemListFragment沟通？

I have default Master-Detail flow, which was created automatically when creating new project. My question is. When I add a button to detail side. Is there a way to update my list side by pressing that button ? In other words, can ItemDetailFragment and ItemListFragment communicate ?

推荐答案

是刚刚经历了监听活动的通信。

Yes just communicate through the activity with a listener.

您的活动：

public class MyActivity extends FragmentActivity implements OnFragmentClickListener {
    @Override
    public void OnFragmentClick(int action, Object object) {
        switch(action) {
        }
    }
}

监听器类：

    public interface OnFragmentClickListener {
        public void OnFragmentClick(int action, Object object);
    }

您片段届时将有在code，以实现该接口下面的话：

Your fragments will then have following somewhere in code in order to implement the interface:

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        try {
            mListener = (OnFragmentClickListener) activity;
        } catch (ClassCastException e) {
            throw new ClassCastException(activity.toString() + " must implement listeners!");
        }
    }

那么你的碎片互相喜欢这个通信：碎裂 - >活动 - > fragmentB。你的活动可以直接打电话methodes的片段，而无需担心同步问题。

Then your fragments communicate with each other like this: fragmentA -> activity -> fragmentB. Your activity can call methodes directly on the fragments without worrying about synchronization problems.

这是片段的一个调用示例：

Example of a call from fragment a:

mListener.OnFragmentClick(GLOBAL_ACTION_KEY someObject);

活动再处理：

Activity then handle:

public class MyActivity extends FragmentActivity implements OnFragmentClickListener {
    @Override
    public void OnFragmentClick(int action, Object object) {
        switch(action) {
            case GLOBAL_ACTION_KEY:
                // you call fragmentB.someMethod();
                break;
        }
    }
}

这篇关于片段之间的通信的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！