视图更新

app/src/main/res/layout/fragment_chat_content_pictures.xml

            android:textColor="#ffffff"
            android:textSize="16dp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintLeft_toRightOf="@+id/backIcon"
            app:layout_constraintRight_toLeftOf="@+id/moreIcon"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            tools:text="1/4" />

app/src/main/res/layout/fragment_chat_photo.xml

    android:layout_height="match_parent">
    <uk.co.senab.photoview.PhotoView
    android:id="@+id/photoView"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:adjustViewBounds="true"
    android:scaleType="centerCrop"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent" />
        android:id="@+id/photoView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:adjustViewBounds="true"
        android:scaleType="fitCenter"
        android:src="@drawable/photo_loading_icon"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
    <!--<ImageView-->
        <!--android:id="@+id/photoView"-->