Question

我有两个标签。在其中一个选项卡中，有一个片段（比如fragment1），其中包含项目的网格视图。如果用户单击网格项，则需要显示新片段（比如fragment2），在后台堆栈中添加旧片段。但是我对替换片段感到磕磕绊绊。点击后，再次出现相同的fragment1。

activity_home.xml：

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/main_content"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:context="in.brewtv.activities.HomeActivity">

    <android.support.design.widget.AppBarLayout
        ...>
            ...
    </android.support.design.widget.AppBarLayout>


    <android.support.v4.view.ViewPager
        android:id="@+id/container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />

</android.support.design.widget.CoordinatorLayout>

HomeActivity.class

public class SectionsPagerAdapter extends FragmentPagerAdapter {

    public SectionsPagerAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int position) {
        // getItem is called to instantiate the fragment for the given page.
        // Return a PlaceholderFragment (defined as a static inner class below).
        switch (position) {
            case 0:
                return MyFeedFragment.newInstance();
            case 1:
                return CategoriesFragment.newInstance();
        }
        return null;
    }
    ...

CategoriesGridDataAdapter.class：

CategoriesItemsRowHolder.view.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        Fragment newFragment = SingleCategoryFragment.newInstance(category);
        FragmentTransaction transaction = ((Activity) mContext).getFragmentManager().beginTransaction();
        transaction.replace(R.id.categories_recycler_view_layout, newFragment ); // give your fragment container id in first parameter
        transaction.addToBackStack(null);  // if written, this transaction will be added to backstack
        transaction.commit();
    }
});

我做错了什么？我该如何纠正？

在一个选项卡中替换片段

0 个答案: