Android-related solutions on FloatActionButton abnormal position

In a recent study Android, previously added in the interface of the ListView control to ensure FAB beautiful interface; behind the ListView want to be able to have a pull-down refresh feature, I am going to use Google's own controls SwipeRefreshLayout to complete the refresh.

• Before modification 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>

 

 In order to achieve the drop-down refresh demand, I will android.support.constraint.ConstraintLayout change for android.support.v4.widget.SwipeRefreshLayout .
After changing discovery FAB gone, baffled.

I think it should be provided with anchor and FAB relationship, but how to change not successful.

Think of a tricky way: the ListView and refresh function into another XML layout files, and then include references over.

• 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>

 

And then show you the real machine

 

 problem solved

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

In the subsequent discovery learning process, SwipeRefreshLayout may like this use, the effect can be reached

     <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" />