活动属于片段通话功能 [英] Call functions of Activities Belonging to a Fragment

问题描述

我有多个片段 Android的下工作，很困惑如何从嵌入式应用程序发送和接收数据。

I am working with multiple Fragments under Android and am confused on how to send and receive data from embedded apps.

对于一个简单的解释，我有一个 ListFragment 和 MapFragment 使用方法说明的here 。这意味着列表家住 ListFragment 类，但是 MapActivity 是活动这是 LocalActivityManagerFragment 下调用。

For a simple explanation, I have a ListFragment and a MapFragment using the method explained here. This means that the List lives in the ListFragment class, however the MapActivity is an Activity that is called under the LocalActivityManagerFragment.

一切工作的各个片段：列表航点，航点和当前位置上的<$ C语言实现的$ C> MapFragment 。我也知道如何使用 getFragmentManager（）来获得个人的片段和使用他们的活动。但是，我不能用这个方法来访问在 MapActivity 函数。我如何可以使用命令，如 goToLocation （以下 MapActivity 创建），如果我点击一个项目上的的ListView ，如果我不能简单地用 getFragmentManager ??

Everything works on the individual Fragments: Lists of waypoints, waypoints and current location implemented on the MapFragment. I also understand how to use getFragmentManager() to get individual Fragments and use their events. However, I cannot use this method to access a function under MapActivity. How can I use a command such as goToLocation (created under MapActivity) if I click on an item on the ListView, if I can't simply use getFragmentManager??

推荐答案

对于一个片段和活动之间的沟通：

For communication between a Fragment and an activity:

活动>片段：

通话的片段使用这个公共的方法。

Call on the public methods of the fragment using this.

TestFragment testFrag = (TestFragment) getFragmentManager().getFragmentById(R.id.testfragment);

if(testFrag != null && testFrag.isAdded())
    testFrag.testMethod("Test");

片段>活动

要发送消息到你需要使用一个接口，这样的片段类添加此活动：（不以任何方式）

To send messages to the activity you need to use an interface so in the fragments class add this: (Not in any method)

public interface testInterface{
    public void testMethod(String test);
}

testInterface mCallback;

@Override
public void onAttact(Activity a){
    try{
        mCallback = (testInterface) a;
    }catch(Exception e){
        //TODO
    }
}

再以任何方法可以去调用这样的：

then in any method you can go and call this:

mCallback.testMethod("hello");

然后为活动做它，所以它实现testInterface 并导入接口

再有这样的方法在活动

@Override
public void testMethod(String testString){

}

:)只要别无所求了。

:) Just ask for anything more.

修改

这是你的问题，我想这是我第一次读的就是你想要的遗憾，仍然可以覆盖你想要的。

From my first read of your question I thought this is what you wanted sorry, could still cover what you wanted.

我觉得你的要求仅仅是一个onItemClick方法吧？

I think what your asking for is just a onItemClick method right?

所以在界面，你可以有

public void onItemClicked(AdapterView<?> parent, View view, int position, long id);

那么当onItemClick被称为片段，你可以在它使用

then when onItemClick has been called in the fragment you can use this in it

mCallback.onItemClicked(parent, view, position, id);

，然后在活动中，鉴于其实施可以让界面

and then in the activity, given its implementing the interface you can have

@Override
public void onItemClicked(AdapterView<?> parent, View view, int position, long id){

}

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