Question

我有滚动活动，我有一个CardView，其行为类似于此动画按钮所示的浮动操作按钮。

正如您所看到的那样，晶圆厂正在消失（进出），但卡片视图的表现并不像那样我的layout.xml如下：

<?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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:context="com.rhcloud.arshadali.task.ScrollingActivity">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/app_bar"
        android:layout_width="match_parent"
        android:layout_height="@dimen/app_bar_height"
        android:fitsSystemWindows="true"
        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">

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

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

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

    <android.support.v7.widget.CardView
        android:id="@+id/id_card"
        android:layout_width="match_parent"
        android:layout_height="46dp"
        app:layout_anchor="@id/app_bar"
        app:layout_anchorGravity="bottom|end"
        android:foreground="@android:color/white"
        android:layout_margin="5dp">
        <ImageView
            android:id="@+id/app_googleplay"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:adjustViewBounds="true"
            android:maxWidth="30dp"
            android:maxHeight="30dp"
            android:layout_gravity="center_vertical"/>
        <TextView
            android:id="@+id/app_apk"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:text="com.javiersantos"
            android:fontFamily="sans-serif-thin"
            android:textColor="@android:color/black"
            android:gravity="center"/>
    </android.support.v7.widget.CardView>

    <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/ic_dialog_email" />

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

有任何方法可以实现这一目标吗？

Answer 1

我认为卡片视图应该是折叠工具栏的子项，以便进行效果处理（将其放在工具栏上方）。

<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:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context="com.rhcloud.arshadali.task.ScrollingActivity">

<android.support.design.widget.AppBarLayout
    android:id="@+id/app_bar"
    android:layout_width="match_parent"
    android:layout_height="@dimen/app_bar_height"
    android:fitsSystemWindows="true"
    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">

    <android.support.v7.widget.CardView
        android:id="@+id/id_card"
        android:layout_width="match_parent"
        android:layout_height="46dp"
        app:layout_anchor="@id/app_bar"
        app:layout_anchorGravity="bottom|end"
        android:foreground="@android:color/white"
        android:layout_margin="5dp">
        <ImageView
            android:id="@+id/app_googleplay"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:adjustViewBounds="true"
            android:maxWidth="30dp"
            android:maxHeight="30dp"
            android:layout_gravity="center_vertical"/>
        <TextView
            android:id="@+id/app_apk"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:text="com.javiersantos"
            android:fontFamily="sans-serif-thin"
            android:textColor="@android:color/black"
            android:gravity="center"/>
        </android.support.v7.widget.CardView>

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            app:layout_collapseMode="pin"
            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/ic_dialog_email" />

Answer 2

将CardView放入LinearLayout并将其移动到工具栏的顶部。它有效。

像这样：

       <android.support.design.widget.CollapsingToolbarLayout
        android:id="@+id/collapsing_toolbar"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:contentScrim="?attr/colorPrimary"
        app:titleEnabled="false"
        app:layout_scrollFlags="scroll|exitUntilCollapsed|snap">
            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                app:layout_collapseMode="parallax"
                app:layout_collapseParallaxMultiplier="0.5"
                android:layout_marginTop="60dp"
                android:orientation="vertical">
                <android.support.v7.widget.CardView
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:layout_margin="5dp"
                    android:padding="10dp">

                </android.support.v7.widget.CardView>
            </LinearLayout>

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:popupTheme="@style/AppTheme.Overlay.Light"
            app:layout_collapseMode="pin" />

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

Answer 3

这项工作：如果您正在使用数据绑定，那么这是一个完美的解决方案：

在同一班上：

@BindingAdapter("hideWithAppBarLayout")
    public static void hideWithAppBarLayout(View view, AppBarLayout appBarLayout) {

        if (appBarLayout == null) return;

        if (view.getParent() instanceof CoordinatorLayout) {
            CoordinatorLayout.LayoutParams lp = (CoordinatorLayout.LayoutParams) view.getLayoutParams();

            lp.setAnchorId(appBarLayout.getId());

            appBarLayout.addOnOffsetChangedListener((AppBarLayout.BaseOnOffsetChangedListener) (appBar, verticalOffset) -> {
                float percentage = ((float) Math.abs(verticalOffset) / appBar.getTotalScrollRange());
                //on collapsing
                if (percentage == 1) view.setVisibility(View.GONE);
                //on expending
                if (percentage == 0) view.setVisibility(View.VISIBLE);
            });
        }
    }

在xml布局中执行以下操作：

<androidx.cardview.widget.CardView
    app:layout_anchor="@id/appbar"
    app:hideWithAppBarLayout="@{appbar}"
    app:layout_anchorGravity="bottom|center_horizontal">

    //todo    

</androidx.cardview.widget.CardView>

CardView不会在滚动活动中折叠

3 个答案: