图像视图裁剪不起作用

imageview-cropping not working

当我尝试 "centerCrop" 或 "center." 时,我的图像视图没有改变,要解决什么问题才能裁剪图像?

<RelativeLayout 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"
        tools:context="xx.myapplication.MainActivity">

        <ImageView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="@drawable/party"
            android:scaleType="centerCrop" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="From. h"
                android:layout_alignParentRight="true"
                android:layout_alignParentBottom="true"
                android:layout_margin="8dp"
                android:padding="8dp"
                android:textSize="20sp"
                android:textColor="#FFEBEE"
                android:fontFamily="sans-serif-medium" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Happy Wednesday!!"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintRight_toRightOf="parent"
                app:layout_constraintTop_toTopOf="parent"
                android:layout_margin="8dp"
                android:textSize="36sp"
                android:textColor="@android:color/white"/>

    </RelativeLayout>

我在代码中看到的图像:

使用src代替background

android:src="@drawable/party"