我有一个FloatingActionButton
实现了向下滚动时隐藏它的行为,并在向上滚动时显示它。
然而,有时当我向上滚动时,它会隐藏自己然后再次出现。根据我的代码,这是不可理解的,因为它只应在向下滚动时隐藏。
也许它与我同时滚动的CollapsingToolbar
相关联?
这是我的布局:
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
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:layout_gravity="right"
android:focusableInTouchMode="true"
android:clickable="true"
android:layoutDirection="rtl"
android:fitsSystemWindows="true"
android:id="@+id/drawer_layout">
<android.support.design.widget.CoordinatorLayout
android:id="@+id/mainCoordinatorLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
android:layoutDirection="rtl"
android:background="#EEEEEE"
android:clickable="true">
<android.support.design.widget.AppBarLayout
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:fitsSystemWindows="true"
android:id="@+id/toolbar_layout">
<android.support.design.widget.CollapsingToolbarLayout
android:id="@+id/collapsing_toolbar"
android:layout_width="match_parent"
android:layout_height="256dp"
android:fitsSystemWindows="true"
app:layout_scrollFlags="scroll|exitUntilCollapsed"
app:contentScrim="?attr/colorPrimary"
app:collapsedTitleGravity="right|top"
app:expandedTitleGravity="bottom|right"
app:expandedTitleMarginBottom="64dp"
app:collapsedTitleTextAppearance="@style/CollapsedTitleTextAppearance"
app:expandedTitleTextAppearance="@style/ExpandedTitleTextAppearance"
app:expandedTitleMarginEnd="0dp"
app:expandedTitleMarginStart="30dp">
<ImageView
android:id="@+id/headerImage"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
android:scaleType="centerCrop"
app:layout_collapseMode="parallax"
android:background="@drawable/soldier" />
<View
android:fitsSystemWindows="true"
android:layout_width="match_parent"
android:layout_height="100dp"
android:background="@drawable/scrim_top"
app:layout_collapseMode="pin" />
<View
android:fitsSystemWindows="true"
android:layout_width="match_parent"
android:layout_height="88dp"
android:layout_gravity="bottom"
android:layout_alignBottom="@+id/headerImage"
android:background="@drawable/scrim_bottom" />
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="104dp"
android:gravity="top"
app:titleTextColor="@color/White"
android:layout_gravity="right"
android:layoutDirection="rtl"
app:layout_scrollFlags="scroll|enterAlways"
app:layout_collapseMode="pin"
app:contentScrim="?attr/colorPrimary"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
app:titleMarginTop="15dp" />
<android.support.design.widget.TabLayout
android:id="@+id/tabs"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:layout_gravity="bottom"
app:tabIndicatorHeight="3dp"
android:layoutDirection="ltr"
app:tabIndicatorColor="@android:color/white"
app:tabSelectedTextColor="@color/White"
app:tabTextColor="@color/Black"
style="@style/MyCustomTabLayout"
app:tabMode="fixed"
app:tabGravity="fill">
<android.support.design.widget.TabItem
android:icon="@drawable/ic_book_white_24px"
android:text="ספרים" />
<android.support.design.widget.TabItem
android:icon="@drawable/soldierWhite"
android:text="הלכות" />
<android.support.design.widget.TabItem
android:icon="@drawable/ic_home_white_24px"
android:text="בית" />
</android.support.design.widget.TabLayout>
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/content_frame"
android:visibility="gone"
android:animateLayoutChanges="true"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
app:behavior_overlapTop="0dp">
</FrameLayout>
<android.support.v4.view.ViewPager
android:id="@+id/mainPager"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:behavior_overlapTop="0dp"
/>
<android.support.design.widget.FloatingActionButton
android:id="@+id/mainFab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_gravity="bottom|end"
android:layout_marginLeft="16dp"
android:layout_marginBottom="16dp"
android:layout_marginTop="5dp"
android:elevation="8dp"
app:layout_behavior="@string/fab_scroll_translation_autohide_behavior"
app:pressedTranslationZ="12dp"
app:backgroundTint="?android:colorAccent"
android:src="@drawable/ic_perm_phone_msg_white_24px" />
<LinearLayout
android:id="@+id/miniFabFrame"
android:focusableInTouchMode="true"
android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:visibility="invisible"
android:layout_alignParentLeft="true"
android:layout_gravity="bottom|end"
android:layout_marginLeft="20dp"
android:layout_marginBottom="80dp"
android:padding="0dp">
<android.support.design.widget.FloatingActionButton
android:id="@+id/messageFab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:elevation="8dp"
android:layout_marginTop="5dp"
android:layout_marginRight="0dp"
android:layout_marginBottom="5dp"
android:layout_marginLeft="5dp"
app:pressedTranslationZ="12dp"
app:backgroundTint="?android:colorPrimary"
app:fabSize="mini"
android:src="@drawable/ic_textSMS_white_24px" />
<android.support.design.widget.FloatingActionButton
android:id="@+id/callFab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_marginTop="5dp"
android:layout_marginRight="0dp"
android:layout_marginBottom="5dp"
android:layout_marginLeft="5dp"
android:elevation="8dp"
app:pressedTranslationZ="12dp"
app:backgroundTint="?android:colorPrimary"
app:fabSize="mini"
android:src="@drawable/ic_call_white_24px" />
</LinearLayout>
</android.support.design.widget.CoordinatorLayout>
<android.support.design.widget.NavigationView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="right"
android:id="@+id/nav_view"
android:layoutDirection="rtl"
app:headerLayout="@layout/header"
app:menu="@menu/nav_menu" />
</android.support.v4.widget.DrawerLayout>
这是我的行为:
[Register("ToratHamachane.ScrollAwareFABBehavior")]
public class ScrollAwareFABBehavior : CoordinatorLayout.Behavior
{
public ScrollAwareFABBehavior(Context context, IAttributeSet attrs) : base(context, attrs)
{
}
public override bool OnStartNestedScroll(CoordinatorLayout coordinatorLayout, Java.Lang.Object child, View directTargetChild, View target, int nestedScrollAxes)
{
return nestedScrollAxes == ViewCompat.ScrollAxisVertical ||
base.OnStartNestedScroll(coordinatorLayout, child, directTargetChild, target, nestedScrollAxes);
}
public override void OnNestedScroll(CoordinatorLayout coordinatorLayout, Java.Lang.Object child, View target, int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed)
{
base.OnNestedScroll(coordinatorLayout, child, target, dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed);
var floatingActionButtonChild = child.JavaCast<FloatingActionButton>();
if (dyConsumed > 0 && floatingActionButtonChild.Visibility == ViewStates.Visible)
floatingActionButtonChild.Hide();
else if (dyConsumed < 0 && floatingActionButtonChild.Visibility != ViewStates.Visible)
floatingActionButtonChild.Show();
}
}
为什么会发生这种情况的任何想法? 我很感激任何帮助。
感谢。
答案 0 :(得分:0)
致电超级
class Author extends DataObject{
private static $db = array (
'AuthorName' => 'Varchar',
);
private static $has_many = array (
'Theses' => 'Theses',
);
public function canView($member = null) {
return Permission::check('CMS_ACCESS_MyAdmin', 'any', $member);
}
public function canEdit($member = null) {
return Permission::check('CMS_ACCESS_MyAdmin', 'any', $member);
}
public function canDelete($member = null) {
return Permission::check('CMS_ACCESS_MyAdmin', 'any', $member);
}
public function canCreate($member = null) {
return Permission::check('CMS_ACCESS_MyAdmin', 'any', $member);
}
private static $summary_fields = array(
'AuthorName',
); }?>
如果这不能解决您的问题,请向您的折叠工具栏添加行为。
你为什么这样做?
public ScrollAwareFABBehavior(Context context, IAttributeSet attrs) : base(context, attrs){
super();
}
您可以使用子代替floatingActionButtonChild。
答案 1 :(得分:0)
使用此调用设置浮动操作按钮的滚动行为。
public class ScrollAwareFabBehaviour extends FloatingActionButton.Behavior {
public ScrollAwareFabBehaviour(Context context, AttributeSet attrs) {
super();
}
@Override
public boolean onStartNestedScroll(final CoordinatorLayout coordinatorLayout, final FloatingActionButton child,
final View directTargetChild, final View target, final int nestedScrollAxes) {
// Ensure we react to vertical scrolling
return nestedScrollAxes == ViewCompat.SCROLL_AXIS_VERTICAL
|| super.onStartNestedScroll(coordinatorLayout, child, directTargetChild, target, nestedScrollAxes);
}
@Override
public void onNestedScroll(final CoordinatorLayout coordinatorLayout, final FloatingActionButton child,
final View target, final int dxConsumed, final int dyConsumed,
final int dxUnconsumed, final int dyUnconsumed) {
super.onNestedScroll(coordinatorLayout, child, target, dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed);
if (dyConsumed > 0 && child.getVisibility() == View.VISIBLE) {
// User scrolled down and the FAB is currently visible -> hide the FAB
child.hide();
} else if (dyConsumed < 0 && child.getVisibility() != View.VISIBLE) {
// User scrolled up and the FAB is currently not visible -> show the FAB
child.show();
}
}
}
并在您的xml中,您设计了FAB设置其行为
<android.support.design.widget.FloatingActionButton
android:id="@+id/fab_add_note"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|right"
android:layout_margin="@dimen/fab_margin"
android:clickable="true"
android:src="@drawable/ic_add_white_24dp"
app:backgroundTint="@color/blue_grey_accent_color"
app:layout_anchor="@id/recycler_notes"
app:layout_anchorGravity="bottom|right|end"
app:layout_behavior="@string/fab_behaviour"
app:rippleColor="#FFF" />
strings.xml中的定义了你的行为类
<string name="fab_behaviour">com.suman.swets.example.uiviews.ScrollAwareFabBehaviour</string>