Question

我一直在尝试使用新的similar to this从材料设计指南中实现布局Android Design Support Library。 CollapsingToolbarLayout似乎是要走的路，但它忽略了任何添加高程的尝试。此外，如果我将AppBarLayout的高度设置为大约144dp以下的任何值，FloatingActionButton将弹出，但不会返回。这是我的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: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="144dp"
    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"
        app:expandedTitleMarginEnd="72dp"
        app:expandedTitleMarginStart="72dp"
        app:layout_scrollFlags="scroll|exitUntilCollapsed">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            android:paddingLeft="72dp"
            app:layout_collapseMode="pin"
            app:popupTheme="@style/ThemeOverlay.AppCompat.Light"/>

    </android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>

<android.support.v7.widget.RecyclerView
    android:id="@+id/recycler_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:scrollbars="vertical"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"/>

<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"
    android:src="@drawable/ic_person_add_white_24dp"
    app:borderWidth="0dp"
    app:fabSize="mini"
    app:layout_anchor="@id/appbar"
    app:layout_anchorGravity="bottom|left|start"/>

Answer 1

在深入了解源代码后，我发现FloatingActionButton附加到AppBarLayout时，只有在可用空间为<=appBarLayout.getMinimumHeightForVisibleOverlappingContent()时才会显示Toolbar，最小为2 *高度（在这种情况下为getMinimumHeightForVisibleOverlappingContent()），加上状态栏。所以在手机上的肖像，56 * 2 + 26 = 138dp。我通过将我的设置为138dp确认了这一点，这有效，而137dp没有。如果您想解决此问题，可以覆盖AppBarLayout中的FloatingActionButton或public boolean onDependentViewChanged(CoordinatorLayout parent, FloatingActionButton child, View dependency) { if(dependency instanceof SnackbarLayout) { this.updateFabTranslationForSnackbar(parent, child, dependency); } else if(dependency instanceof AppBarLayout) { AppBarLayout appBarLayout = (AppBarLayout)dependency; if(this.mTmpRect == null) { this.mTmpRect = new Rect(); } Rect rect = this.mTmpRect; ViewGroupUtils.getDescendantRect(parent, dependency, rect); if(rect.bottom <= appBarLayout.getMinimumHeightForVisibleOverlappingContent()) { if(!this.mIsAnimatingOut && child.getVisibility() == 0) { this.animateOut(child); } } else if(child.getVisibility() != 0) { this.animateIn(child); } } return false; }中的以下方法：

CollapsingToolbarLayout

关于Option Explicit Sub Workbook_Open() ' This routine is called when the workbook is opened. With Worksheets("Sheet1") Dim ordercount As Integer ordercount = ActiveWorkbook.Worksheets("Sheet1").Range("A2", Worksheets("Sheet1").Range("A2").End(xlDown)).Rows.Count 'create matchcount column Range("G1").Select ActiveCell.FormulaR1C1 = "Match Count" Columns("G:G").Select 'create batchsheet Sheets.Add After:=Sheets(Sheets.Count) Sheets("Sheet4").Select Sheets("Sheet4").Name = "batches" Sheets("Sheet1").Select Range("A1:G1").Select 'copying the headers into new sheet Selection.Copy Sheets("batches").Select Range("A1").Select ActiveSheet.Paste End With End Sub Sub match() Do Until ordercount = 0 Dim currentrow As Long currentrow = 2 Dim matchrange As Range Set matchrange = Worksheets("sheet1").Columns("B3:F") Location = Range("B2:F").Cells.Value For Each Row In matchrange Dim matchcount As Integer matchcount = 0 For Each cell In Row If currentrow.Location = Location And Location > 0 Then 'I don't want the 0's to count as matches matchcount = matchcount + 1 Next Column("G").Row.cell.Value = matchcount Next Call sort Call Remove Loop End Sub Sub sort() Columns("G:G").Select ActiveWorkbook.Worksheets("Sheet1").sort.SortFields.Clear ActiveWorkbook.Worksheets("Sheet1").sort.SortFields.Add Key:=Range("G1"), _ SortOn:=xlSortOnValues, Order:=xlDescending, DataOption:=xlSortNormal With ActiveWorkbook.Worksheets("Sheet1").sort .SetRange Range("G3:G") .Header = xlNo .MatchCase = False .Orientation = xlTopToBottom .SortMethod = xlPinYin .Apply End With End Sub Sub Remove() Range("A2:G11").Select Selection.Cut Sheets("Sheet2").Select Range("A2").Select ActiveSheet.Paste Sheets("Sheet1").Select Selection.Delete Shift:=xlUp End Sub提升，我还没有找到解决方法。

Answer 2

对于CollapsingToolbarLayout提升，您可以在子类CollapsingToolbarLayout.OffsetUpdateListener中搜索方法onOffsetChanged来完成工作

 if(Math.abs(verticalOffset) == scrollRange) {
     ViewCompat.setElevation(layout, layout.getTargetElevation());
 } else {
     ViewCompat.setElevation(layout, 0.0F);
 }

Answer 3

关于高程，折叠工具栏布局在未折叠时显式删除高程*。它已被提交为一个错误似乎：

https://code.google.com/p/android/issues/detail?id=192553&q=elevation&colspec=ID%20Status%20Priority%20Owner%20Summary%20Stars%20Reporter%20Opened

（正如@Ben在他的回答和对源代码的引用中所说的那样）

直接链接到代码（目前，第1062行）： https://android.googlesource.com/platform/frameworks/support/+/master/design/src/android/support/design/widget/CollapsingToolbarLayout.java#1062

if (Math.abs(verticalOffset) == scrollRange) {
    // If we have some pinned children, and we're offset to only show those views,
    // we want to be elevate
    ViewCompat.setElevation(layout, layout.getTargetElevation());
} else {
    // Otherwise, we're inline with the content
    ViewCompat.setElevation(layout, 0f);
}

CollapsingToolbarLayout高程不起作用并锚定FloatingActionButton不返回

3 个答案: