im_ui_view_msg_home.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:id="@+id/view_bg"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <View
        android:id="@+id/divider"
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:background="@color/im_divide_color"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent" />

    <View
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:background="?android:attr/selectableItemBackground"
        app:layout_constraintBottom_toTopOf="@+id/divider"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <ImageView
        android:id="@+id/sdv_head"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_marginBottom="15dp"
        android:layout_marginLeft="15dp"
        android:layout_marginStart="15dp"
        android:layout_marginTop="15dp"
        android:contentDescription="@null"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"/>

    <TextView
        android:id="@+id/tv_new_num"
        android:layout_width="20dp"
        android:layout_height="20dp"
        android:background="@drawable/im_shape_circle_red"
        android:gravity="center"
        android:text=""
        android:textColor="@color/im_white"
        android:textSize="14sp"
        android:visibility="invisible"
        app:layout_constraintEnd_toEndOf="@+id/sdv_head"
        app:layout_constraintTop_toTopOf="@+id/sdv_head"
        tools:text="2"
        tools:visibility="visible" />

    <TextView
        android:id="@+id/name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="14dp"
        android:ellipsize="end"
        android:maxLines="1"
        android:textColor="#444444"
        android:textSize="17sp"
        app:layout_constraintStart_toEndOf="@+id/sdv_head"
        app:layout_constraintTop_toTopOf="parent"
        tools:text="小壹" />

    <TextView
        android:id="@+id/content"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginBottom="14dp"
        android:layout_marginEnd="16dp"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="16dp"
        android:layout_marginStart="8dp"
        android:ellipsize="end"
        android:singleLine="true"
        android:textColor="#888888"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="@+id/view_bg"
        app:layout_constraintStart_toEndOf="@+id/sdv_head"
        tools:text="最近消息。。。" />

    <TextView
        android:id="@+id/time"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="15dp"
        android:layout_marginRight="15dp"
        android:layout_marginTop="16dp"
        android:textColor="#999999"
        android:textSize="12sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:text="10:50" />

</android.support.constraint.ConstraintLayout>