Android 關于FloatActionButton位置例外的相關解決方法

近期在學習Android，先前在ListView界面中添加了FAB控制元件來保證界面美觀;后面又想能夠使ListView有下拉重繪的功能，我準備使用谷歌自身的控制元件SwipeRefreshLayout來完成重繪功能，

• 修改之前的activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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">

    <ListView
        android:id="@+id/lvwStudent"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        tools:ignore="MissingConstraints"
        tools:layout_editor_absoluteX="8dp"
        tools:layout_editor_absoluteY="8dp" />

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/floatingActionButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="4dp"
        android:layout_marginStart="8dp"
        android:clickable="true"
        android:focusable="true"
        app:fabSize="normal"
        app:layout_anchorGravity="end|center"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:srcCompat="@drawable/add" />

</android.support.constraint.ConstraintLayout>

 為了實作下拉重繪的需求，我將android.support.constraint.ConstraintLayout更改為了android.support.v4.widget.SwipeRefreshLayout，
更改后發現FAB不見了，百思不得其解，

我想應該是和FAB的錨點設定有關系，但怎么改也不成功，

于是想到了一個取巧的方法：把ListView和重繪功能放到另一個XML布局檔案中，再用include參考過來，

• student_list.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.SwipeRefreshLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/swip_main_layout"
    xmlns:tools="http://schemas.android.com/tools">

    <ListView
        android:id="@+id/lvwStudent"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        tools:ignore="MissingConstraints"
        tools:layout_editor_absoluteX="8dp"
        tools:layout_editor_absoluteY="8dp" />

</android.support.v4.widget.SwipeRefreshLayout> 

• activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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">

    <include
        android:layout_height="match_parent"
        android:layout_width="match_parent"
        layout="@layout/student_list"/>

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/floatingActionButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="4dp"
        android:layout_marginStart="8dp"
        android:clickable="true"
        android:focusable="true"
        app:fabSize="normal"
        app:layout_anchorGravity="end|center"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:srcCompat="@drawable/add" />

</android.support.constraint.ConstraintLayout>

再在真機演示一下

 問題解決

 /*************************************************************************************************/

在后續的學習程序中發現，SwipeRefreshLayout可以像這樣使用，也能達成效果

     <android.support.v4.widget.SwipeRefreshLayout
            android:id="@+id/swip_main_layout"
            android:layout_width="match_parent"
            android:layout_height="match_parent">

            <ListView
                android:id="@+id/lvwStudent"
                android:layout_width="match_parent"
                android:layout_height="0dp" />

     </android.support.v4.widget.SwipeRefreshLayout>

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/floatingActionButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="4dp"
        android:layout_marginStart="8dp"
        android:clickable="true"
        android:focusable="true"
        app:fabSize="normal"
        app:layout_anchorGravity="end|center"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:srcCompat="@drawable/add" />

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