android - Android：如何在滚动时将中间布局贴在顶部

Question

当我在中间布局（黄色视图）位于顶部时垂直滚动时，它应该停留在顶部位置并滚动底部布局的其余部分。

我不知道如何激活它请帮助我

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:fillViewport="true">

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <View
            android:id="@+id/viewFirst"
            android:layout_width="match_parent"
            android:layout_height="400dp"
            android:background="#990000" />

        <View
            android:id="@+id/viewMiddle"
            android:layout_width="match_parent"
            android:layout_height="100dp"
            android:background="#ddaa00" />

        <View
            android:id="@+id/viewLast"
            android:layout_width="match_parent"
            android:layout_height="500dp"
            android:background="#0000AA" />
    </LinearLayout>
</ScrollView>

标签： androidxmlkotlinscrollview

Answer 1

这可能不完全是您想要的，但是它可以帮助您做您想做的事情。

您可以使用一个CoordinatorLayout持有AppBarLayout和其他一些滚动视图，例如在您的情况下ScrollView

• AppBarLayout持有你的viewFirst&viewFirst2

• viewFirst必须包含在一个CollapsingToolbarLayout带有 app:layout_scrollFlags="scroll|exitUntilCollapsed"属性的集合中

• 滚动视图必须app:layout_behavior="@string/appbar_scrolling_view_behavior"设置属性才能实现CoordintatorLayout功能。

如果您要使用ScrollView，那么您必须使用android:nestedScrollingEnabled="true"来启用滚动行为以及本身CoordintatorLayout的滚动功能。ScrollView

android:nestedScrollingEnabled="true"仅从 API-21 开始可用

或者，您可以使用NestedScrollView或任何其他滚动视图，例如RecyclerView

<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.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">

    <com.google.android.material.appbar.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <com.google.android.material.appbar.CollapsingToolbarLayout
            android:id="@+id/collapsing_toolbar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:layout_scrollFlags="scroll|exitUntilCollapsed">

            <View
                android:id="@+id/viewFirst"
                android:layout_width="match_parent"
                android:layout_height="400dp"
                android:background="#990000" />

        </com.google.android.material.appbar.CollapsingToolbarLayout>

        <View
            android:id="@+id/viewMiddle"
            android:layout_width="match_parent"
            android:layout_height="100dp"
            android:background="#ddaa00" />

    </com.google.android.material.appbar.AppBarLayout>

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:nestedScrollingEnabled="true"
        app:layout_behavior="@string/appbar_scrolling_view_behavior">

        <TextView
            android:id="@+id/viewLast"
            android:layout_width="match_parent"
            android:layout_height="500dp"
            android:background="#0000AA"
            android:text="
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Auctor a etiam, ipsum venenatis sociosqu ut elementum sodales et, venenatis a libero porro vehicula. Arcu dictum sed tempor, libero aliquam, aenean viverra congue eros sed. Etiam aenean eleifend sit mauris, wisi pellentesque massa non urna suscipit. Nisl sit euismod cursus lectus. Lacus ligula ipsum quam dui curabitur eros. At aliquam torquent varius proin sociosqu, mi id fringilla nec."
            android:textColor="#fff" />

    </ScrollView>


</androidx.coordinatorlayout.widget.CoordinatorLayout>

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