Question

我使用下面的代码来实现 tabhost ：

public class MyActivity extends FragmentActivity {

    private FragmentTabHost mTabHost = null;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_mylayout);

        mTabHost = (FragmentTabHost) findViewById(R.id.tabHost);
        mTabHost.setup(this, getSupportFragmentManager(), android.R.id.tabcontent);

        mTabHost.addTab(mTabHost.newTabSpec("A").setIndicator("A"), AFragment.class, null);
        mTabHost.addTab(mTabHost.newTabSpec("B").setIndicator("B"), BFragment.class, null);
    }
}

它包含2个标签， AFragment.class 如下：

public class AFragment extends Fragment {
    private MyAdapter MyAdapter;

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

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_folder_base, container, false);
        ListView ListV = (ListView)view.findViewById(R.id.listview);
        FolderList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
              //How to implement to launnch another fragmentC under the same tab
            }
        });

        ...

        MyAdapter = new MyAdapter(this.getActivity(), this.getContext());
        ListV.setAdapter(MyAdapter);
        return view;
    }
}

我想在点击项目时启动另一个片段（FragmentC），我该如何实现它？

如何在这些片段中实现onBackPressed()函数？

Answer 1

答：要在FragmentB中添加FragmentC，请将其放入FragmentB：

getActivity().getChildrenFragmentManager()
             .beginTransaction()
             .replace(R.id.fragmentCcontainer, new FragmentC)
             .commit();

其中R.id.fragmentCcontainer是放置在其他fragmentB视图之上的空视图的id /它是一个片段持有者：

fragment_b.xml：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <!--Put FragmentB's Views Here-->

    <FrameLayout
        android:id="@+id/fragmentCcontainer"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</RelativeLayout>

B：片段中没有onBackPressed（）方法。在您的情况下，您应该覆盖activity的onBackPressed（）方法并实现切换到其中的上一个选项卡;

如何在当前选项卡中启动另一个片段

1 个答案: