android - 为什么向上滚动时滚动会停在折叠的工具栏处？ (不扩大显示图像)

Question

正如我在标题中所解释的那样，如果我在下拉后立即移开手指从底部快速滚动到顶部，则滚动将停止在折叠的工具栏处。我想让它扩大。如果我顺利地拉动 nestedscrollview，没有问题，工具栏会正确展开。我在 nestedscrollview 中有回收站 View 。这是我的布局

<android.support.design.widget.CoordinatorLayout
    android:id="@+id/detail_content"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    >

    <android.support.design.widget.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="160dp"
        android:fitsSystemWindows="true"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
        >

        <android.support.design.widget.CollapsingToolbarLayout
            android:id="@+id/collapsing_toolbar"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:fitsSystemWindows="true"
            android:theme="@style/ThemeOverlay.AppCompat.Dark"
            app:contentScrim="?attr/colorPrimary"
            app:expandedTitleMarginEnd="@dimen/article_keylines"
            app:expandedTitleMarginStart="@dimen/md_keylines"
            app:expandedTitleMarginBottom="@dimen/article_keylines"
            app:layout_scrollFlags="scroll|exitUntilCollapsed"
            app:expandedTitleTextAppearance="@dimen/tile_padding"
            >

            <ImageView
                android:id="@+id/image"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:background="@drawable/a"
                android:fitsSystemWindows="true"
                android:foreground="@drawable/scrim_profile"
                android:scaleType="centerCrop"
                app:layout_collapseMode="parallax" />


            <android.support.v7.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                app:layout_collapseMode="pin"
                android:elevation="4dp"
                app:layout_scrollFlags="scroll|enterAlways|snap"
                app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />

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

    <android.support.v4.widget.NestedScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/nestedscrollview"
        android:background="@color/background"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
        >

        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"

            >
            <RelativeLayout
                android:id="@+id/inner_relativeLayout"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:paddingLeft="@dimen/md_keylines"
                android:paddingRight="@dimen/md_keylines"
                android:background="@color/white"
                android:paddingBottom="@dimen/article_keylines"
                android:paddingTop="@dimen/article_keylines"
                android:focusableInTouchMode="true"
                >
                <TextView
                    android:id="@+id/tw1"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:textColor="@color/text"
                    android:textSize="16sp"
                    android:lineSpacingExtra="4sp"
                    android:text="Text"
                    android:layout_marginBottom="@dimen/md_keylines"/>

                <View
                    android:id="@+id/divider_1"
                    android:layout_width="2dp"
                    android:layout_height="50dp"
                    android:background="@color/divisor"
                    android:layout_below="@id/tw1"
                    />
                <View
                    android:id="@+id/divider_2"
                    android:layout_width="2dp"
                    android:layout_height="50dp"
                    android:background="@color/divisor"
                    android:layout_below="@id/tw1"
                    android:layout_toRightOf="@+id/tw2"
                    android:layout_toEndOf="@+id/tw2" />
                <View
                    android:id="@+id/divider_3"
                    android:layout_width="2dp"
                    android:layout_height="50dp"
                    android:background="@color/divisor"
                    android:layout_below="@+id/tw1"
                    android:layout_toRightOf="@+id/followers"
                    android:layout_toEndOf="@+id/followers"/>

                <TextView
                    android:id="@+id/count"
                    android:gravity="center_horizontal"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:textColor="@color/text"
                    android:textSize="20sp"
                    android:text="14"
                    android:lineSpacingExtra="-4sp"
                    android:layout_alignTop="@id/divider_1"
                    android:layout_marginTop="6dp"
                    android:layout_alignRight="@+id/experience"
                    android:layout_alignEnd="@+id/experience"
                    />
                <TextView
                    android:id="@+id/tw3"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:textColor="@color/text"
                    android:textSize="14sp"
                    android:text="Text"
                    android:paddingRight="12dp"
                    android:paddingEnd="12dp"
                    android:paddingLeft="12dp"
                    android:paddingStart="12dp"

                    android:layout_below="@id/tw2"
                    android:layout_toRightOf="@id/divider_1"

                    />

                <TextView
                    android:id="@+id/count2"
                    android:layout_toRightOf="@id/divider_2"
                    android:layout_toLeftOf="@id/divider_3"
                    android:layout_below="@id/tw1"
                    android:gravity="center_horizontal"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:textColor="@color/text"
                    android:textSize="20sp"
                    android:layout_alignTop="@id/divider_1"
                    android:layout_marginTop="6dp"
                    android:text="200"
                    />
                <TextView
                    android:id="@+id/tw4"
                    android:layout_below="@id/tw3"
                    android:layout_toRightOf="@id/divider_2"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:gravity="center_horizontal"
                    android:textColor="@color/text"
                    android:textSize="14sp"
                    android:text="text"
                    android:paddingLeft="12dp"
                    android:paddingRight="12dp"
                    />
                <Button
                    android:id="@+id/button"
                    android:layout_toRightOf="@id/divider_3"
                    android:layout_below="@id/tw1"
                    android:layout_marginLeft="12dp"
                    android:layout_width="match_parent"
                    android:layout_height="38dp"
                    android:textColor="@color/orange_button"
                    android:gravity="center_vertical|start"
                    android:text="text"
                    android:textSize="16sp"
                    android:textAllCaps="false"
                    android:paddingLeft="18dp"
                    android:drawableLeft="@drawable/i"
                    android:drawablePadding="4dp"
                    android:layout_alignTop="@id/count"
                    style="?android:attr/borderlessButtonStyle"
                    android:background="@drawable/button"/>

            </RelativeLayout>

            <android.support.v7.widget.RecyclerView
                android:padding="@dimen/md_keylines"
                android:id="@+id/recycler_view"
                android:layout_below="@id/inner_relativeLayout"
                android:layout_width="match_parent"
                android:layout_height="match_parent"

                />
            <ProgressBar
                android:id="@+id/progress_bar"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_centerHorizontal="true"
                android:layout_below="@id/inner_relativeLayout"
                android:layout_marginTop="30dp"/>
        </RelativeLayout>

    </android.support.v4.widget.NestedScrollView>
</android.support.design.widget.CoordinatorLayout>

提前致谢。

Answer 1

在我多次尝试覆盖另一个 stackoverflow answer 中的 AppBarLayout.Behavior 之后,我找到了一个可以解决我的问题的库。 ( smooth-app-bar-layout )

使用有3个步骤。小心第3步。您应该将 nestedscrollview 放在协调器布局下方的 smoothappbarlayout 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"
  android:layout_width="match_parent"
  android:layout_height="match_parent">

  <android.support.v7.widget.NestedScrollView
    android:id="@android:id/list"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

  <me.henrytao.smoothappbarlayout.SmoothAppBarLayout
    android:id="@+id/smooth_app_bar_layout"
    android:layout_width="match_parent"
    android:layout_height="@dimen/app_bar_height">

    <android.support.design.widget.CollapsingToolbarLayout
      android:id="@+id/collapsing_toolbar_layout"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      app:layout_scrollFlags="scroll|exitUntilCollapsed">

      <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        app:layout_collapseMode="pin"
        app:navigationIcon="@drawable/ic_toolbar_arrow_back"
        style="@style/AppStyle.MdToolbar" />
    </android.support.design.widget.CollapsingToolbarLayout>
  </me.henrytao.smoothappbarlayout.SmoothAppBarLayout>
</android.support.design.widget.CoordinatorLayout>