FragmentTabHost &片段 - 如何在选项卡之间传递数据? [英] FragmentTabHost & Fragments - How do I pass data between tabs?

问题描述

我有一个带有 FragmentTabHost 的 MainActivity (FragmentActivity).

I have a MainActivity (FragmentActivity) that has a FragmentTabHost.

public class FragmentTabs extends FragmentActivity {
    private FragmentTabHost mTabHost;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.fragment_tabs);
        mTabHost = (FragmentTabHost)findViewById(android.R.id.tabhost);
        mTabHost.setup(this, getSupportFragmentManager(), R.id.realtabcontent);

        mTabHost.addTab(mTabHost.newTabSpec("classA").setIndicator("Class A"),
            ClassA.class, null);
        mTabHost.addTab(mTabHost.newTabSpec("classB").setIndicator("Class B"),
            ClassB.class, null);
        mTabHost.addTab(mTabHost.newTabSpec("classC").setIndicator("Class C"),
            ClassC.class, null);
    }
}

ClassA、ClassB 和 ClassC 都是片段(android.support.v4.app.Fragment).

ClassA, ClassB and ClassC are all Fragments (android.support.v4.app.Fragment).

我需要在 Fragment 上传递数据(和调用方法).我如何获得每个片段的引用，如下所示:

I need to pass data (and call methods) on the Fragments. How can I get a reference of each of the Fragments, like this:

ClassA mClassAFragment = ???;

我尝试过使用 getSupportFragmentManager().findFragmentByTag() 并且我也尝试探索 mTab​​Host 的功能.没有什么可以得到它们.

I've tried using getSupportFragmentManager().findFragmentByTag() and I've also tried exploring the capabilities of mTabHost. Nothing can get them.

你能建议一种方法来做到这一点还是建议一种替代方法?

Can you suggest a way to do this or suggest an alternative approach?

推荐答案

OP 在这里.为了解决这个问题，我在 FragmentActivity 中重载了 onAttachFragment 方法:

OP here. To solve this problem I have overloaded the onAttachFragment method in my FragmentActivity:

public class FragmentTabs extends FragmentActivity {
    private FragmentTabHost mTabHost;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        ...
    }

    @Override
    public void onAttachFragment(Fragment fragment) {
    super.onAttachFragment(fragment);

    if (fragment.getClass() == ClassA.class) {
        ClassA mClassAFragment = (ClassA)fragment
            ...
        }
    }
}

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