Android 关于FloatActionButton位置异常的相关解决方法

近期在学习Android,先前在ListView界面中添加了FAB控件来保证界面美观;后面又想能够使ListView有下拉刷新的功能,我准备使用谷歌自身的控件SwipeRefreshLayout来完成刷新功能。

<?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>

 

 为了实现下拉刷新的需求,我将android.support.constraint.ConstraintLayout更改为了android.support.v4.widget.SwipeRefreshLayout
更改后发现FAB不见了,百思不得其解。

我想应该是和FAB的锚点设置有关系,但怎么改也不成功。

于是想到了一个取巧的方法:把ListView和刷新功能放到另一个XML布局文件中,再用include引用过来。

<?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> 
<?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>

 

再在真机演示一下

 

 问题解决

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

在后续的学习过程中发现,SwipeRefreshLayout可以像这样使用,也能达成效果

     <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" />

 

Android 关于FloatActionButton位置异常的相关解决方法

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