CoordinatorLayout、FAB和容器布局冲突

Question

我有一个主 activity 和一个带 container layout 的抽屉，我将每个片段替换为 FragmentManager。

我想将 FAB 添加到 hide/show 滚动的我的一个子片段中，但我不确定我做错了什么并得到：

布局：

<?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"
  android:layout_width="match_parent"
  android:layout_height="match_parent">

  <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.v7.widget.Toolbar
      android:id="@+id/toolbar"
      android:layout_width="match_parent"
      android:layout_height="?actionBarSize"
      android:minHeight="?actionBarSize"
      android:theme="@style/Toolbar"
      app:layout_scrollFlags="scroll|enterAlways" />

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

  <FrameLayout
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior" />

  <android.support.design.widget.FloatingActionButton
    style="@style/Widget.Design.FloatingActionButton"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="bottom|right|end"
    android:layout_marginBottom="@dimen/spacing_medium"
    android:layout_marginRight="@dimen/spacing_medium"
    android:elevation="@dimen/elevation_little"
    app:fabSize="normal"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    app:srcCompat="@drawable/ic_add_white_18dp" />

</android.support.design.widget.CoordinatorLayout>

Answer 1

将 app:layout_anchor="@id/container" 添加到您的 FAB。此外，通过指示 bottom|right，无需包含 end

Answer 2

尝试下面的代码

public class FABBehaviour extends FloatingActionButton.Behavior {

    public FABBehaviour(Context context, AttributeSet attrs) {
        super();
    }

    @Override
    public void onNestedScroll(CoordinatorLayout coordinatorLayout, FloatingActionButton child, View target, int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed) {
        super.onNestedScroll(coordinatorLayout, child, target, dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed);

        //child -> Floating Action Button
        if (dyConsumed > 0) {
            CoordinatorLayout.LayoutParams layoutParams = (CoordinatorLayout.LayoutParams) child.getLayoutParams();
            int fab_bottomMargin = layoutParams.bottomMargin;
            child.animate().translationY(child.getHeight() + fab_bottomMargin).setInterpolator(new LinearInterpolator()).start();
        } else if (dyConsumed < 0) {
            child.animate().translationY(0).setInterpolator(new LinearInterpolator()).start();
        }
    }

    @Override
    public boolean onStartNestedScroll(CoordinatorLayout coordinatorLayout, FloatingActionButton child, View directTargetChild, View target, int nestedScrollAxes) {
        return nestedScrollAxes == ViewCompat.SCROLL_AXIS_VERTICAL;
    } }

在Xml

app:layout_behavior="Your PpackageName.FABBehaviour"

Answer 3

看起来 CoordinatorLayout 无法处理不属于 "direct children".
[=25 的子视图的行为=]
您需要在 fab 视图中添加 app:layout_anchorGravity="bottom|right|end" 和 android:layout_gravity="end|bottom"。

例如：

<android.support.design.widget.FloatingActionButton
        android:id="@+id/fab_feeds"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="16dp"
        android:clickable="true"
        android:layout_gravity="end|bottom"
        android:src="@drawable/ic_plus_white"
        app:layout_anchorGravity="bottom|right|end"/>

CoordinatorLayout、FAB和容器布局冲突

CoordinatorLayout, FAB and container layout conflict

android

android-fragments

material-design

floating-action-button

android-coordinatorlayout