在 Android 中，如果 NestedScrollView 没有滚动的内容，如何让 CollapsingToolbar 停止折叠？此功能目前存在于 Android 5.1.1 上的联系人应用程序中。但是，在我的代码中，当 NestedScrollView 停止滚动时，工具栏继续折叠，在两者之间留下间隙。
<?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:id="@+id/main_content"
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="256dp"
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"
app:layout_scrollFlags="scroll|exitUntilCollapsed"
app:contentScrim="?attr/colorPrimary"
app:expandedTitleMarginStart="@dimen/content_padding_normal"
app:expandedTitleMarginEnd="64dp">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:titleTextAppearance="@style/ActionBar.TitleText"
app:layout_collapseMode="pin" />
</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"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
android:scrollbars="none">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:paddingBottom="@dimen/keyline_2">
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="@dimen/element_spacing_normal">
<include
layout="@layout/ViewLoadingIndeterminate" />
<LinearLayout
android:id="@+id/progress_status_container"
style="@style/ConnectionFieldContainer"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:orientation="vertical"
android:visibility="visible">
<Spinner
android:id="@+id/progress_status"
android:layout_width="match_parent"
style="@style/Text.ConnectionField" />
<TextView
style="@style/Text.ConnectionLabel"
android:text="@string/mobile.customer.connect.progress.status" />
</LinearLayout>
</android.support.v7.widget.CardView>
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="@dimen/element_spacing_normal">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<LinearLayout
android:id="@+id/email1_container"
style="@style/ConnectionFieldContainer"
android:orientation="horizontal"
tools:visibility="visible">
<LinearLayout
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_weight="1"
android:orientation="vertical">
<TextView
android:id="@+id/email1"
style="@style/Text.ConnectionField"
tools:text="[email protected] /cdn-cgi/l/email-protection" />
<TextView
style="@style/Text.ConnectionLabel"
android:text="@string/mobile.customer.connect.email1" />
</LinearLayout>
<ImageButton
android:id="@+id/action_email1"
style="@style/Button.ConnectionAction"
android:src="@drawable/ic_email_black_24dp" />
</LinearLayout>
<LinearLayout
android:id="@+id/email2_container"
style="@style/ConnectionFieldContainer"
android:orientation="horizontal"
tools:visibility="visible">
<LinearLayout
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_weight="1"
android:orientation="vertical">
<TextView
android:id="@+id/email2"
style="@style/Text.ConnectionField"
tools:text="[email protected] /cdn-cgi/l/email-protection" />
<TextView
style="@style/Text.ConnectionLabel"
android:text="@string/mobile.customer.connect.email2" />
</LinearLayout>
<ImageButton
android:id="@+id/action_email2"
style="@style/Button.ConnectionAction"
android:src="@drawable/ic_email_black_24dp" />
</LinearLayout>
<LinearLayout
android:id="@+id/phone_day_container"
style="@style/ConnectionFieldContainer"
android:orientation="horizontal"
tools:visibility="visible">
<LinearLayout
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_weight="1"
android:orientation="vertical">
<TextView
android:id="@+id/phone_day"
style="@style/Text.ConnectionField"
tools:text="801-555-1234" />
<TextView
style="@style/Text.ConnectionLabel"
android:text="@string/mobile.customer.connect.phone.day" />
</LinearLayout>
<ImageButton
android:id="@+id/action_call_phone_day"
style="@style/Button.ConnectionAction"
android:src="@drawable/ic_call_black_24dp" />
<ImageButton
android:id="@+id/action_text_phone_day"
style="@style/Button.ConnectionAction"
android:src="@drawable/ic_textsms_black_24dp" />
</LinearLayout>
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
<android.support.design.widget.FloatingActionButton
android:id="@+id/create_reminder"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_anchor="@id/collapsing_toolbar"
app:layout_anchorGravity="bottom|right|end"
app:borderWidth="0dp"
app:elevation="@dimen/shadow_size"
android:layout_marginBottom="@dimen/keyline_1"
android:layout_marginRight="@dimen/keyline_1"
android:src="@drawable/ic_alarm_add_white_24dp"
app:backgroundTint="?attr/colorAccent" />
</android.support.design.widget.CoordinatorLayout>
只需添加
android:layout_gravity="fill_vertical"
在你的 NestedScrollView 中。 :)
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