Android Studio编译无错，但在模拟器上无法运行App

今天在学习郭霖老师的《第一行代码》第三版时碰到一个问题，明明运行无错，却无法在模拟器上正常运行。一开始提示说“Waiting for all target devices to come online”，在百度后进行了Cold Boot Now 和 Wipe Data也无用。大佬们有没有懂的帮忙看看，阿里嘎多。

activity_main.xml

<?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"tools:context=".MainActivity"><androidx.recyclerview.widget.RecyclerViewandroid:id="@+id/recyclerView"android:layout_width="match_parent"android:layout_height="match_parent" /></LinearLayout>

fruit_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_margin="5dp"><ImageViewandroid:id="@+id/fruitImage"android:layout_width="40dp"android:layout_height="40dp"android:layout_gravity="center_horizontal"android:layout_marginTop="10dp"/><TextViewandroid:id="@+id/fruitName"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_gravity="left"android:layout_marginTop="10dp" /></LinearLayout>

MainActivity.kt

package com.example.listviewimport android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.ImageView
import android.widget.TextView
import androidx.appcompat.app.AppCompatActivity
import androidx.recyclerview.widget.RecyclerView
import androidx.recyclerview.widget.StaggeredGridLayoutManager
import kotlinx.android.synthetic.main.activity_main.*class MainActivity : AppCompatActivity() {private val fruitList = ArrayList<Fruit>()override fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)setContentView(R.layout.activity_main)initFruits() // 初始化水果数据val layoutManager = StaggeredGridLayoutManager(3, StaggeredGridLayoutManager.VERTICAL)recyclerView.layoutManager = layoutManagerval adapter = FruitAdapter(fruitList)recyclerView.adapter = adapter}class Fruit(val name:String, val imageId: Int)class FruitAdapter(val fruitList: List<Fruit>) : RecyclerView.Adapter<FruitAdapter.ViewHolder>() {inner class ViewHolder(view: View) : RecyclerView.ViewHolder(view) {val fruitImage: ImageView = view.findViewById(R.id.fruitImage)val fruitName: TextView = view.findViewById(R.id.fruitName)}override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {val view = LayoutInflater.from(parent.context).inflate(R.layout.fruit_item, parent, false)return ViewHolder(view)}override fun onBindViewHolder(holder: ViewHolder, position: Int) {val fruit = fruitList[position]holder.fruitImage.setImageResource(fruit.imageId)holder.fruitName.text = fruit.name}override fun getItemCount() = fruitList.size}private fun initFruits() {repeat(2) {fruitList.add(Fruit(getRandomLengthString("Apple"),R.drawable.apple_pic))fruitList.add(Fruit(getRandomLengthString("Banana"),R.drawable.banana_pic))fruitList.add(Fruit(getRandomLengthString("Orange"),R.drawable.orange_pic))fruitList.add(Fruit(getRandomLengthString("Watermelon"),R.drawable.watermelon_pic))fruitList.add(Fruit(getRandomLengthString("Pear"),R.drawable.pear_pic))fruitList.add(Fruit(getRandomLengthString("Grape"),R.drawable.grape_pic))fruitList.add(Fruit(getRandomLengthString("Pineapple"),R.drawable.pineapple_pic))fruitList.add(Fruit(getRandomLengthString("Strawberry"),R.drawable.strawberry_pic))fruitList.add(Fruit(getRandomLengthString("Cherry"),R.drawable.cherry_pic))fruitList.add(Fruit(getRandomLengthString("Mango"),R.drawable.mango_pic))}}private fun getRandomLengthString(str: String): String {val n = (1..20).random()val builder = StringBuilder()repeat(n) {builder.append(str)}return builder.toString()}}

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Android Studio编译无错，但在模拟器上无法运行App

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