安卓實作下拉框--簡單版（需要改進的地方很 記錄一下

需要改進的地方 1.點擊不同 實作對不同頁面的跳轉 這個簡單 判斷一下就行了

2.搜索框 自動補全 這個難 首先搜索框 然后自動補全 這個地方完善了就好了 做的跟Taobao一樣 （goal）

基礎版

增強版 戳這

MainActivity

package com.example.listviewtest

import android.content.Intent
import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import android.widget.ArrayAdapter
import android.widget.ImageView
import android.widget.Toast

import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {
    //val dataImage: ImageView =findViewById(R.id.dataImage)
    private val dataList=ArrayList<Rabbit>()
    /*private val data=listOf("Rabbit1","Rabbit2","Rabbit3","Rabbit4","Rabbit5","Rabbit6","Rabbit7","Rabbit8",
        "Rabbit9","Rabbit10","Rabbit11","Rabbit12","Rabbit1","Rabbit2","Rabbit3","Rabbit4","Rabbit5","Rabbit6","Rabbit7","Rabbit8",
        "Rabbit9","Rabbit10","Rabbit11","Rabbit12")*/
    override fun onCreate(savedInstanceState: Bundle?) {
        //initRabbits()

        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        initRabbits()

        val adapter=RabbitAdapter(this,R.layout.rabbit_item,dataList)
        listView.adapter=adapter
        listView.setOnItemClickListener{ parent,view,position,id->
            val rabbit=dataList[position]
            var intent= Intent(this,CatInfo::class.java)
            Toast.makeText(this,rabbit.name,Toast.LENGTH_SHORT).show()
            startActivity(intent)
        }
    }
    private fun initRabbits(){
        repeat(10){
            dataList.add(Rabbit("小貓咪",R.drawable.pic1))
            dataList.add(Rabbit("眼巴巴",R.drawable.pic3))

        }
    }


}

Adapater

package com.example.listviewtest

import android.app.Activity
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.ArrayAdapter
import android.widget.ImageView
import android.widget.ListView
import android.widget.TextView

class RabbitAdapter(activity:Activity,val resourceId:Int,data:List<Rabbit>)
    :ArrayAdapter<Rabbit>(activity, resourceId,data) {
    override fun getView(position: Int, convertView: View?, parent: ViewGroup): View {
        val view=LayoutInflater.from(context).inflate(resourceId,parent,false)
        //view這個出問題 沒有映射到我想要的那一個xml
        //val dataView:ListView=view.findViewById(R.id.listView)
        val dataImage: ImageView =view.findViewById(R.id.dataImage)
        val dataName: TextView =view.findViewById(R.id.dataName)
        val data=getItem(position)
        if(data!=null){
            dataImage.setImageResource(data.imageId)
            dataName.text=data.name
        }
        return view
    }
}

rabbit_item

<?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="60dp"
    tools:context="RabbitAdapter">
    <ImageView
        android:id="@+id/dataImage"
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:layout_gravity="center_vertical"
        android:layout_marginLeft="10dp"
        />
    <TextView
        android:id="@+id/dataName"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical"
        android:layout_marginLeft="10dp"
        />
</LinearLayout>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
        <ListView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:id="@+id/listView"/>
</LinearLayout>

Rabbit.xml

package com.example.listviewtest

class Rabbit (
    val name:String,
    val imageId:Int
    )

代碼架構

執行結果