android – 嵌套片段中带有recyclerView的AppBarLayout

由于图像总是比文字更好,我向你呈现my current layout.

工具栏/选项卡位于带有viewPager的activity.xml中,recyclelerView位于viewPager中的片段内.因此,您可以向右/向左滑动以查看其他内容.

我的问题是我希望AppBarLayout在其滚动行为中绑定到第一个片段中的recyclerView,而不是其他片段.

在下面的代码中,我做了这个绑定,但它不起作用,因为recyclerView无法识别外部布局中的AppBarLayout.
你有解决方法吗？

活动代码：

<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:fab="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/appbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar_main"
            android:layout_width="match_parent"
            /* pretty stuff */
            app:layout_scrollFlags="scroll|enterAlways">

            <android.support.design.widget.TabLayout
                android:id="@+id/tabs"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                /* pretty stuff */ />

        </android.support.v7.widget.Toolbar>

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

    <android.support.v4.view.ViewPager
        android:id="@+id/main_pager"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <android.support.design.widget.SupportFloatingActionsMenu
           ...>
           /* Code for a fancy fab w/ menu */

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

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

对于包含recyclerView的片段：

<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.insa.burnd.view.MainActivity.NewsfeedFragment"
    android:id="@+id/fragment_newsfeed">

    <android.support.v4.widget.SwipeRefreshLayout
        android:id="@+id/swipe_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_behavior="@string/appbar_scrolling_view_behavior">

        <android.support.v7.widget.RecyclerView
            android:id="@+id/recyclerView"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />

    </android.support.v4.widget.SwipeRefreshLayout>

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

非常感谢你 ：) ！

解决方法:

您可以通过实现ViewPager.OnPageChangeListener并启用/禁用AppBarLayout.LayoutParams滚动标记来完成此操作.

这是一个示例代码：

        viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
        @Override
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

        }

        @Override
        public void onPageSelected(int position) {
            if (position == 0) {
                //turn on scrolling
                AppBarLayout.LayoutParams toolbarLayoutParams = (AppBarLayout.LayoutParams) mToolbar.getLayoutParams();
                toolbarLayoutParams.setScrollFlags(AppBarLayout.LayoutParams.SCROLL_FLAG_SCROLL | AppBarLayout.LayoutParams.SCROLL_FLAG_ENTER_ALWAYS);
                mToolbar.setLayoutParams(toolbarLayoutParams);

                CoordinatorLayout.LayoutParams appBarLayoutParams = (CoordinatorLayout.LayoutParams) appBarLayout.getLayoutParams();
                appBarLayoutParams.setBehavior(new AppBarLayout.Behavior());
                appBarLayout.setLayoutParams(appBarLayoutParams);
            } else {
                //turn off scrolling
                AppBarLayout.LayoutParams toolbarLayoutParams = (AppBarLayout.LayoutParams) mToolbar.getLayoutParams();
                toolbarLayoutParams.setScrollFlags(0);
                mToolbar.setLayoutParams(toolbarLayoutParams);

                CoordinatorLayout.LayoutParams appBarLayoutParams = (CoordinatorLayout.LayoutParams) appBarLayout.getLayoutParams();
                appBarLayoutParams.setBehavior(null);
                appBarLayout.setLayoutParams(appBarLayoutParams);
            }
        }

        @Override
        public void onPageScrollStateChanged(int state) {

        }
    });

但它似乎不是一个好的用户体验模式.这会让用户感到困惑.

标签：androiddesignsupport,android-appbarlayout,android,android-fragments
来源： https://codeday.me/bug/20191005/1856017.html