ImAndroid/app/src/main/res/layout/activity_chat.xml

<?xml version="1.0" encoding="utf-8"?>
<layout 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">

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:background="#F6F6F6"
        android:layout_height="match_parent"
        tools:context=".ui.ChatActivity">


        <androidx.swiperefreshlayout.widget.SwipeRefreshLayout
            android:id="@+id/refreshLayout"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:tag="layout/activity_base_list_0"
            app:layout_constraintBottom_toTopOf="@+id/line"
            app:layout_constraintTop_toTopOf="parent">

            <com.xuqm.base.view.EmptyView
                android:id="@+id/baseEmptyView"
                android:layout_width="match_parent"
                android:layout_height="match_parent">

                <androidx.recyclerview.widget.RecyclerView
                    android:id="@+id/baseRecyclerView"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:overScrollMode="never" />

            </com.xuqm.base.view.EmptyView>

        </androidx.swiperefreshlayout.widget.SwipeRefreshLayout>

        <View
            android:id="@+id/line"
            android:layout_width="match_parent"
            android:layout_height="1dp"
            android:background="@color/line"
            app:layout_constraintBottom_toTopOf="@+id/tools" />

        <androidx.constraintlayout.widget.ConstraintLayout
            android:id="@+id/tools"
            android:layout_width="match_parent"
            android:layout_height="60dp"
            app:layout_constraintBottom_toBottomOf="parent">

            <EditText
                android:id="@+id/et"
                android:layout_width="0dp"
                android:layout_height="50dp"
                android:layout_marginHorizontal="5dp"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toStartOf="@+id/btn_send"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toTopOf="parent" />

            <Button
                android:id="@+id/btn_send"
                android:layout_width="65dp"
                android:layout_height="40dp"
                android:layout_marginHorizontal="5dp"
                android:text="发送"
                android:textSize="11sp"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintTop_toTopOf="parent" />

        </androidx.constraintlayout.widget.ConstraintLayout>
    </androidx.constraintlayout.widget.ConstraintLayout>
</layout>