折叠工具栏折叠时隐藏浮动按钮 [英] Hide floating button when collapsing toolbar is collapsed
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问题描述
我有一个协调器布局,其中包含折叠的工具栏,nestedscrollview和一个浮动按钮. 我的浮动按钮位于折叠工具栏的右下角. 我希望折叠式工具栏完全折叠时按钮消失.并在其他情况下可见.
I have a coordinator layout containing a collapsing toolbar, a nestedscrollview and a floating button. My floating button is placed at the bottom right end of the collapsing toolbar. I want the button to disappear when the collapsing toolbar is completely collapsed. And be visible in other situation.
我的xml:
<?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="fr.djey.secretapp.MainActivity">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/AppTheme.AppBarOverlay"
android:id="@+id/appBar">
<android.support.design.widget.CollapsingToolbarLayout
android:id="@+id/collapse_toolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_scrollFlags="scroll|exitUntilCollapsed"
android:fitsSystemWindows="true"
app:contentScrim="?attr/colorPrimary"
app:expandedTitleMarginStart="48dp"
app:expandedTitleMarginEnd="64dp">
<ImageView
android:id="@+id/collapsing_image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:fitsSystemWindows="true"
app:layout_collapseMode="parallax"
android:scaleType="centerCrop"
android:src="@drawable/welcome"/>
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
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"
xmlns:tools="http://schemas.android.com/tools"
android:layout_gravity="fill_vertical"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/content_frame">
</FrameLayout>
</android.support.v4.widget.NestedScrollView>
<android.support.design.widget.FloatingActionButton
android:id="@+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="-60dp"
android:layout_marginRight="16dp"
android:src="@android:drawable/ic_dialog_email"
app:layout_anchor="@id/collapse_toolbar"
app:layout_anchorGravity="bottom|right|end" />
</android.support.design.widget.CoordinatorLayout>
有可能吗?
推荐答案
尝试这个小的更改
<android.support.design.widget.FloatingActionButton
...
app:layout_anchor="@id/appBar"
app:layout_anchorGravity="bottom|right|end" />
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