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  • 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。

    • 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>

     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。

    • 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" />
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  • 原文地址:https://www.cnblogs.com/sds2xy/p/12510815.html
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