我有CollapsingToolbarLayout
,内有两个FloatingActionButtons
。仅当Toolbar
展开时,这些FAB才可见。折叠时,它们被隐藏。如果工具栏也被折叠,我需要它们可见。我该怎么办?
非常感谢您的提示...
<?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=".CalendarEventInsUpdActivity">
<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="parallax"
app:popupTheme="@style/AppTheme.PopupOverlay"/>
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<include layout="@layout/content_calendar_event"/>
<android.support.design.widget.FloatingActionButton
android:id="@+id/btnSave"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="@dimen/fab_margin"
android:src="@android:drawable/ic_menu_save"
app:backgroundTint="@android:color/holo_green_light"
app:layout_anchor="@id/app_bar"
app:layout_anchorGravity="bottom|center"/>
<android.support.design.widget.FloatingActionButton
android:id="@+id/btnCancel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="@dimen/fab_margin"
android:src="@android:drawable/ic_menu_revert"
app:backgroundTint="@android:color/holo_red_light"
app:layout_anchor="@id/app_bar"
app:layout_anchorGravity="bottom|end"/>
</android.support.design.widget.CoordinatorLayout>
答案 0 :(得分:0)
您必须将Fabs作为cordinatorLayout的直接子项插入并使用布局行为:
<android.support.design.widget.FloatingActionButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_behavior="@string/appbar_scrolling_view_behavior"/>
答案 1 :(得分:0)
您需要向FAB添加Behavior。
尝试类似的内容:
public class ScrollingFABBehavior extends CoordinatorLayout.Behavior<FloatingActionButton> {
private int toolbarHeight;
public ScrollingFABBehavior(Context context, AttributeSet attrs) {
super(context, attrs);
this.toolbarHeight = Utils.getToolbarHeight(context);
}
@Override
public boolean layoutDependsOn(CoordinatorLayout parent, FloatingActionButton fab, View dependency) {
return dependency instanceof AppBarLayout;
}
@Override
public boolean onDependentViewChanged(CoordinatorLayout parent, FloatingActionButton fab, View dependency) {
//do nothing with the fab or write your logic for the FAB
return true;
}
}
然后使用XML FAB标记添加行为
app:layout_behavior="com.example.ScrollingFABBehavior" />
答案 2 :(得分:0)
试试这个xml。
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/main_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="@dimen/detail_backdrop_height"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
android:fitsSystemWindows="true">
<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"
android:fitsSystemWindows="true"
app:contentScrim="?attr/colorPrimary"
app:expandedTitleMarginStart="48dp"
app:expandedTitleMarginEnd="64dp">
<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>
<include layout="@layout/content_calendar_event"/>
<android.support.design.widget.FloatingActionButton
android:id="@+id/btnSave"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="@dimen/fab_margin"
android:src="@android:drawable/ic_menu_save"
app:backgroundTint="@android:color/holo_green_light"
app:layout_anchor="@id/app_bar"
app:layout_anchorGravity="bottom|center"/>
<android.support.design.widget.FloatingActionButton
android:id="@+id/btnCancel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="@dimen/fab_margin"
android:src="@android:drawable/ic_menu_revert"
app:backgroundTint="@android:color/holo_red_light"
app:layout_anchor="@id/app_bar"
app:layout_anchorGravity="bottom|end"/>
</android.support.design.widget.CoordinatorLayout>