Question

我正在使用MainActivity根据底部导航栏（例如frgament_list_layout）在片段之间移动。在那里，我有一个带有可单击项的Recycleview，单击时我想在当前片段的顶部打开一个新片段，但它在我的导航栏上运行（我希望与以前保持相同）。你可以帮我吗？

我想设置一个新片段，但不知道为什么它不起作用。

public class ListOfBooks extends Fragment {
...
 public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

        View view = inflater.inflate(R.layout.fragment_list_layout, null);
..
}
...


  /** this function replaces the layout to a book page layout in case some book was clicked in the list */
    private void loadBookPageFragment() {
        BookPageFragment bookPage = new BookPageFragment();
        FragmentManager manager = getFragmentManager();
        FragmentTransaction frag_trans = getActivity().getSupportFragmentManager().beginTransaction();;
        frag_trans = manager.beginTransaction();
        frag_trans.addToBackStack("ListView");  // enables to press "return" and go back to the list view
        frag_trans.hide(ListOfBooks.this);
        frag_trans.replace(android.R.id.content, bookPage);
        frag_trans.commit();
    }
}

class BookPageFragment extends Fragment设置fragment_book_page.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"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <android.support.design.widget.AppBarLayout
        android:id="@+id/app_bar"
        android:layout_width="match_parent"
        android:layout_height="250dp"
        android:theme="@style/AppTheme.AppBarOverlay">

        <android.support.design.widget.CollapsingToolbarLayout
            android:id="@+id/toolbar_layout"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:fitsSystemWindows="true"
            app:contentScrim="?attr/colorPrimary"
            app:layout_scrollFlags="scroll|exitUntilCollapsed"
            app:title="@string/book_name" >

            <ImageView
                android:id="@+id/toolbar_image"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:adjustViewBounds="true"
                android:contentDescription="@null"
                android:fitsSystemWindows="true"
                android:scaleType="centerCrop"
                android:src="@drawable/splash_temp_icon" />

            <android.support.v7.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                app:layout_collapseMode="parallax"
                app:popupTheme="@style/AppTheme.PopupOverlay" />


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

    <include
        layout="@layout/content_scrolling" />

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="@dimen/fab_margin"
        app:layout_anchor="@id/app_bar"
        app:layout_anchorGravity="bottom|end"
        app:srcCompat="@android:drawable/btn_star" />

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

我的导航栏：

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


    <item
        android:id="@+id/navigation_list"
        android:icon="@mipmap/ic_map_marker_radius"
        android:title="@string/title_list" />

    <item
        android:id="@+id/navigation_map_view"
        android:icon="@mipmap/ic_map_marker"
        android:title="@string/title_map_view" />

    <item
        android:id="@+id/navigation_profile"
        android:icon="@mipmap/ic_profile_black"
        android:title="@string/title_profile" />
</menu>
``

为什么我不能添加滚动片段以使其不会超出我的底部导航栏？

0 个答案: