Android 定位到应用程序栏的FAB不';不要在向上滚动时隐藏
我已将FAB锚定到AppBarLayout。然而,在向上滚动时,FAB的预期行为是在工具栏折叠时隐藏。这种情况不会发生 这需要特别处理吗 我定义的布局如下:Android 定位到应用程序栏的FAB不';不要在向上滚动时隐藏,android,floating-action-button,android-appbarlayout,Android,Floating Action Button,Android Appbarlayout,我已将FAB锚定到AppBarLayout。然而,在向上滚动时,FAB的预期行为是在工具栏折叠时隐藏。这种情况不会发生 这需要特别处理吗 我定义的布局如下: <android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:
<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/rootLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<android.support.v4.view.ViewPager
android:id="@+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior" />
<android.support.design.widget.AppBarLayout
android:id="@+id/appbar"
android:layout_width="match_parent"
android:layout_height="256dp"
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="206dip"
android:background="@color/my_primary"
android:fitsSystemWindows="true"
app:contentScrim="?attr/colorPrimary"
app:expandedTitleMarginBottom="20dp"
app:expandedTitleMarginEnd="64dp"
app:expandedTitleMarginStart="16dp"
app:layout_scrollFlags="scroll|exitUntilCollapsed">
<!--<ImageView-->
<!--android:id="@+id/backdrop"-->
<!--android:layout_width="match_parent"-->
<!--android:layout_height="match_parent"-->
<!--android:fitsSystemWindows="true"-->
<!--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"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
</android.support.design.widget.CollapsingToolbarLayout>
<android.support.design.widget.TabLayout
android:id="@+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="bottom"
app:tabMode="scrollable" />
</android.support.design.widget.AppBarLayout>
<android.support.design.widget.FloatingActionButton
android:id="@+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="16dp"
android:clickable="true"
android:src="@drawable/ic_stop_white_24dp"
app:layout_anchor="@id/appbar"
app:layout_anchorGravity="bottom|right|end" />
也许可以将滚动侦听器设置为scrollview,并根据需要隐藏晶圆厂 @MufaddalGulshan,查看寻呼机可能是问题所在。使用recycler视图或NestedScrollView。我从中了解到,只有支持“嵌套滚动”的视图才能使用这种行为。我不知道它是否仍然没有解决。但我会把它留在这里,希望它能帮助别人。我也遇到了这个问题,通过实现AppBarStateChangeListener解决了这个问题,然后通过编程隐藏/显示浮动操作按钮 以下是完整的实现:
public abstract class AppBarStateChangeListener implements AppBarLayout.OnOffsetChangedListener {
public enum State {
EXPANDED,
COLLAPSED,
IDLE
}
private State mCurrentState = State.IDLE;
@Override
public final void onOffsetChanged(AppBarLayout appBarLayout, int i) {
if (i == 0) {
if (mCurrentState != State.EXPANDED) {
onStateChanged(appBarLayout, State.EXPANDED);
}
mCurrentState = State.EXPANDED;
} else if (Math.abs(i) >= appBarLayout.getTotalScrollRange()) {
if (mCurrentState != State.COLLAPSED) {
onStateChanged(appBarLayout, State.COLLAPSED);
}
mCurrentState = State.COLLAPSED;
} else {
if (mCurrentState != State.IDLE) {
onStateChanged(appBarLayout, State.IDLE);
}
mCurrentState = State.IDLE;
}
}
public abstract void onStateChanged(AppBarLayout appBarLayout, State state);
}
然后应用它:
appBarLayout.addOnOffsetChangedListener(new AppBarStateChangeListener() {
@Override
public void onStateChanged(AppBarLayout appBarLayout, State state) {
if(state == State.COLLAPSED){
fab.hide();
}else if(state == State.EXPANDED){
fab.show();
}
});
是否尝试添加滚动标志?已添加滚动标志。请参阅布局postedI,将标志滚动到fab@MufaddalGulshan它起作用了。我用reyclerview试过了,没有查看页面。试着加奶酪sqaure@NikolaDespotoski滚动标志无效。如果可能,请提供解决方案的详细信息。
<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=".ScrollingActivity">
<android.support.design.widget.AppBarLayout
android:id="@+id/app_bar"
android:fitsSystemWindows="true"
android:layout_height="@dimen/app_bar_height"
android:layout_width="match_parent"
android:theme="@style/AppTheme.AppBarOverlay">
<android.support.design.widget.CollapsingToolbarLayout
android:id="@+id/toolbar_layout"
android:fitsSystemWindows="true"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:toolbarId="@+id/toolbar"
app:layout_scrollFlags="scroll|exitUntilCollapsed"
app:contentScrim="?attr/colorPrimary">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_height="?attr/actionBarSize"
android:layout_width="match_parent"
app:layout_collapseMode="pin"
app:popupTheme="@style/AppTheme.PopupOverlay"/>
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<include layout="@layout/content_scrolling"/>
<android.support.design.widget.FloatingActionButton
android:id="@+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="@dimen/fab_margin"
app:layout_anchor="@id/app_bar"
app:layout_anchorGravity="bottom|end"
app:srcCompat="@android:drawable/ic_dialog_email"/>
</android.support.design.widget.CoordinatorLayout>