android点击按钮控制图片切换-kotlin

class MainActivity : AppCompatActivity() {         override fun onCreate(savedInstanceState: Bundle?) {             super.onCreate(savedInstanceState)        setContentView(R.layout.activity_main)        initView()    }    private fun initView() {             val chooseGridFriendBtn: Button = findViewById(R.id.chooseGridFriend)        chooseGridFriendBtn.setOnClickListener {      chooseGirlFriend() }    }    // 选女友的方法实现    private fun chooseGirlFriend() {             val chooseGirlfriend = ChooseGirlfriend(5) // 只有5张图        val girlFriend = chooseGirlfriend.renderChoose()        Toast.makeText(this, "" + girlFriend, Toast.LENGTH_SHORT).show()        // 显示对应图片        val girlFriendImageSource =  when (girlFriend){                 1 -> R.drawable._0            2 -> R.drawable._1            3 -> R.drawable._2            4 -> R.drawable._3            5 -> R.drawable._4            else -> R.drawable.dice        }        // 展示选中图片        val girlFriendImageView: ImageView = findViewById(R.id.imageView)        girlFriendImageView.setImageResource(girlFriendImageSource)    }}/** 女友选择器* 随机数选择 默认1-6* */class ChooseGirlfriend(private val numDice: Int = 6) {         fun renderChoose(): Int {             return (1..numDice).random()    }}

<?xml version="1.0" encoding="utf-8"?><LinearLayout 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"    android:orientation="vertical"    tools:context=".MainActivity">        <ImageView        android:id="@+id/imageView"        android:layout_width="215dp"        android:layout_height="150dp"        android:layout_gravity="center"        android:layout_marginVertical="20dp"        android:contentDescription="@string/dice_image"        app:srcCompat="@drawable/dice" />    <Button        android:id="@+id/chooseGridFriend"        android:layout_width="237dp"        android:layout_height="wrap_content"        android:layout_gravity="center"        android:text="@string/choose_a_girlfriend" />LinearLayout>

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