CollapsingToolbarLayout
上的大多数教程和材料都显示了在expanding
布局时,向上箭头仅保留Toolbar
的最小高度(like this one)但有一些实现,其中向上箭头与扩展一起移动并转到扩展工具栏所在的位置。
我是如何做到的,就像大多数实现一样 - 除非工具栏崩溃,否则向上箭头会隐藏。知道如何改变吗?
修改
活动:
toolbar = (Toolbar) findViewById(R.id.toolbarDetails);
setSupportActionBar(toolbar);
getSupportActionBar().setHomeButtonEnabled(true);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
activity.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:id="@+id/detailsCoordinatorLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<android.support.design.widget.AppBarLayout
android:id="@+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
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"
app:contentScrim="?attr/colorPrimary"
app:expandedTitleMarginEnd="64dp"
app:expandedTitleMarginStart="48dp"
app:layout_scrollFlags="scroll|exitUntilCollapsed|snap">
<ImageView
android:id="@+id/backdrop"
android:layout_width="match_parent"
android:layout_height="200dp"
android:fitsSystemWindows="true"
android:scaleType="centerCrop"
android:src="@drawable/eventdetailico"
android:transitionName="eventImage"
app:layout_collapseMode="parallax" />
<android.support.v7.widget.Toolbar
android:id="@+id/toolbarDetails"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_collapseMode="pin"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<android.support.design.widget.FloatingActionButton
android:id="@+id/fab_add"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:clickable="true"
android:src="@drawable/addico"
app:layout_anchor="@id/appbar"
app:layout_anchorGravity="bottom|right|end" />
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/darkgrey"
app:layout_behavior="@string/appbar_scrolling_view_behavior">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/darkgrey">
<TextView
android:id="@+id/tvEventPrice"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_marginTop="30dp"
android:layout_marginRight="10dp"
android:layout_alignParentRight="true"
android:textColor="@color/white"
android:textSize="17sp"
/>
</RelativeLayout>
</android.support.v4.widget.NestedScrollView>
</android.support.design.widget.CoordinatorLayout>