带有BottomNavigationView的FloatingActionButton

Question

我无法定位我的FAB。它应该在右下角，但在BottonNavigationView的上方。

1）我能否在coordinateLayout中不使用RelativeLayout来实现这一点？

2）给我看看如何做

3）我应该使用FrameLayout作为片段的容器吗？

<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="wrap_content"
    android:paddingTop="@dimen/appbar_padding_top"
    android:theme="@style/AppTheme.AppBarOverlay">

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="?attr/colorPrimary"
        app:layout_scrollFlags="scroll|enterAlways"
        app:popupTheme="@style/AppTheme.PopupOverlay">

    </android.support.v7.widget.Toolbar>

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

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

</FrameLayout>

<android.support.design.widget.FloatingActionButton
    android:id="@+id/fab_electricity"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="end|bottom"
    android:layout_margin="@dimen/fab_margin"
    app:layout_anchorGravity="bottom|right|end"
    app:srcCompat="@drawable/ic_add_electro" />

<android.support.design.widget.BottomNavigationView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_gravity="bottom">

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

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

- Xmstr

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https://github.com/aurelhubert/ahbottomnavigation/issues/38 - Aditya Vyas-Lakhan

问题重复。请查看此答案。 https://dev59.com/L1kS5IYBdhLWcg3w6qMz#61584002 - Abdul Qadir

Answer 1

快速搜索FloatingActionButton.Behavior告诉我们以下内容。

@Override
public void onAttachedToLayoutParams(@NonNull CoordinatorLayout.LayoutParams lp) {
    if (lp.dodgeInsetEdges == Gravity.NO_GRAVITY) {
        // If the developer hasn't set dodgeInsetEdges, lets set it to BOTTOM so that
        // we dodge any Snackbars
        lp.dodgeInsetEdges = Gravity.BOTTOM;
    }
}

由于BottomNavigationView也位于布局底部。将以下元素添加到您的BottomNavigationView中，CoordinatorLayout将自动处理插入和闪避。

app:layout_insetEdge="bottom"

- LightYearsBehind

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我必须确保底部栏与 FAB 在同一个 xml 文件中（而不是在某个包含的子布局中）。 - Daniel Wilson

确切地说，要达到这个效果，BottomNavigationView和FloatingActionButton都必须是CoordinatorLayout的直接后代（子级）。 - LightYearsBehind

Answer 2

1. If you stick it in a linear layout and move the bottom nav outside of the coordinator view, it will be below it on the screen.

2. You could do it this way, but I prefer using an empty fragment container which I put in the hosting activity, and then place the fragment inside of it in code.

   <android.support.design.widget.AppBarLayout
       android:id="@+id/appbar"
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:paddingTop="@dimen/appbar_padding_top"
       android:theme="@style/AppTheme.AppBarOverlay">
   
       <android.support.v7.widget.Toolbar
           android:id="@+id/toolbar"
           android:layout_width="match_parent"
           android:layout_height="?attr/actionBarSize"
           android:background="?attr/colorPrimary"
           app:layout_scrollFlags="scroll|enterAlways"
          app:popupTheme="@style/AppTheme.PopupOverlay">
   
       </android.support.v7.widget.Toolbar>
   
   </android.support.design.widget.AppBarLayout>
   
   <FrameLayout
       android:id="@+id/fragment_container"
       android:layout_width="match_parent"
       android:layout_height="match_parent"
       app:layout_behavior="@string/appbar_scrolling_view_behavior">
   
   
   </FrameLayout>
   
   <android.support.design.widget.FloatingActionButton
       android:id="@+id/fab_electricity"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:layout_gravity="bottom|right"
       app:srcCompat="@drawable/ic_add_electro"/>
   
   
   
   </android.support.design.widget.CoordinatorLayout>
   <android.support.design.widget.BottomNavigationView
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:layout_alignParentBottom="true"
       android:layout_gravity="bottom">
   
   </android.support.design.widget.BottomNavigationView>
   </LinearLayout>
   

- parkgrrr

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请检查 https://dev59.com/hqfja4cB1Zd3GeqPtEQu - Daniel Gomez Rico