Question

NOte：我已经使用ViewPager实现了标签。我正在创建一个在viewpager中有三个选项卡（Fragments）的应用程序。我想创建一个导航抽屉，在那里我可以看到这三个标签并点击任何导航我到相应的标签。

主要活动扩展了ActionBarActivity并具有以下代码

 private class DrawerItemClickListener implements ListView.OnItemClickListener {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

Fragment fragment = new CategoryFragment();
    Bundle args = new Bundle();
    args.putInt(CategoryFragment.CATEGORY_NUMBER, position);
    fragment.setArguments(args);

    FragmentTransaction transaction =      getSupportFragmentManager().beginTransaction();

    transaction.replace(R.id.pager, fragment);
    transaction.addToBackStack(null);
    transaction.commit();
    getSupportFragmentManager().executePendingTransactions();

    // update selected item and title, then close the drawer
    mDrawerList.setItemChecked(position, true);
    setTitle(mOptionsNavDrawer[position]);
    mDrawerLayout.closeDrawer(mDrawerList);

}

CategoryFragment看起来像这样

    public static class CategoryFragment extends android.support.v4.app.Fragment {
    public static final String CATEGORY_NUMBER = "category_number";

    public CategoryFragment() {
        // Empty constructor required for fragment subclasses
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        int fragmentNumber = getArguments().getInt(CATEGORY_NUMBER);
        View rootView=null;
        if(fragmentNumber==0)
        {
             rootView = inflater.inflate(R.layout.F1, container, false);
        }
        else if (fragmentNumber==1)
        {
            rootView = inflater.inflate(R.layout.F2, container, false);
        }
        else if(fragmentNumber==2)
        {
            rootView = inflater.inflate(R.layout.F3, container, false);
        }
        else
        {
            rootView = inflater.inflate(R.layout.F4, container, false);
        }
        return rootView;
    }


}

调用CategoryFragment中的OnCreateView函数，但没有设置片段（F1.F2.F3）。有没有其他方法可以调用这些片段？每个片段都是相应的标签。

Answer 1

您的Activity中需要一个方法来帮助在标签之间切换。类似的东西：

public void displayView(int position) {

    // update the main content by replacing fragments
    Fragment fragment = null;
    switch (position) {
        case 0:
            fragment = new FragmentA();               
            break;
        case 1:
            fragment = new FragmentB();

            break;
        case 2:
            fragment = new FragmentC();

            break;

        default:
            break;
    }

    if (fragment != null) {
        FragmentTransaction transaction =  fragmentManager.beginTransaction();
        transaction.addToBackStack(null);
        transaction.replace(R.id.frame_container, fragment);
        transaction.commit();

每个片段应该彼此独立，不需要将包信息传递给CategoryFragment

导航抽屉与视图寻呼机，标签不工作

1 个答案: