java - 如何在水平选项卡滚动时制作固定横幅？

Question

我有这样的布局，其中用户可以垂直和水平滚动。它还有选项卡和横幅。

If the user scrolls vertically, the banner collapses. But if the user scroll horizontally between tabs, I want the banner on a fixed position or is steady.

    <android.support.design.widget.CoordinatorLayout
        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:fitsSystemWindows="true"
            android:orientation="vertical"
            android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

            <android.support.design.widget.CollapsingToolbarLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                app:layout_scrollFlags="scroll|exitUntilCollapsed">

                <ImageView
                    android:id="@+id/campaign_banner"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:visibility="gone" />

                <android.support.v7.widget.Toolbar
                    android:layout_width="match_parent"
                    android:layout_height="0dp"
                    app:layout_collapseMode="pin" />

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

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

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

Answer 1

当用户按照以下代码以编程方式切换选项卡调用时，也使用 app:layout_scrollFlags="pin"

appBarLayout.setExpanded(true);