android——spinner下拉弹窗、popupwindow下拉弹窗列表

一、spinner下拉弹窗

效果图如下：

adapter的代码：

package com.yaona.spinnerimport android.R
import android.content.Context
import android.graphics.Color
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.ArrayAdapter
import android.widget.TextViewclass SpinnerAdapter(context: Context,textViewResourceId: Int, objects: Array<String>
) : ArrayAdapter<String?>(context, textViewResourceId, objects) {private var context: Contextprivate var items = arrayOf<String>()init {items = objectsthis.context = context}/** 点击后弹窗显示 **/override fun getDropDownView(position: Int, convertView: View?,parent: ViewGroup): View? {val tv: TextView = if (convertView == null) {val inflater = LayoutInflater.from(context)val view = inflater.inflate(R.layout.simple_spinner_item, parent, false)view.findViewById(R.id.text1)} else {convertView.findViewById(R.id.text1)}tv.text = items[position]tv.setTextColor(Color.BLUE)tv.textSize = 24freturn tv}/** spinner控件显示 **/override fun getView(position: Int, convertView: View?, parent: ViewGroup): View {var convertView = convertViewif (convertView == null) {val inflater = LayoutInflater.from(context)convertView = inflater.inflate(R.layout.simple_spinner_item, parent, false)}val tv = convertView?.findViewById<View>(R.id.text1) as TextViewtv.text = items[position]
//        tv.setTextColor(Color.BLUE)tv.textSize = 24freturn convertView!!}
}

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xml代码：

<?xml version="1.0" encoding="utf-8"?>
<layout 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"><data></data><androidx.constraintlayout.widget.ConstraintLayoutandroid:layout_width="match_parent"android:layout_height="match_parent"tools:context=".MainActivity"><androidx.appcompat.widget.AppCompatSpinnerandroid:id="@+id/sp_supply_refund"android:layout_width="200dp"android:layout_height="70dp"android:background="@drawable/spinner_triangle"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintStart_toStartOf="parent"app:layout_constraintTop_toTopOf="parent" /></androidx.constraintlayout.widget.ConstraintLayout>
</layout>

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MainActivity代码

import android.R
import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import com.yaona.spinner.databinding.ActivityMainBindingclass MainActivity : AppCompatActivity() {private lateinit var binding: ActivityMainBindingoverride fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)binding = ActivityMainBinding.inflate(layoutInflater)initSupplierSpinner(mutableListOf("张三", "李四","王五"))setContentView(binding.root)}private fun initSupplierSpinner(list: List<String>) {// 创建一个适配器用于显示 Spinner 中的项目列表val adapter = SpinnerAdapter(this, R.layout.simple_spinner_item, list.toTypedArray())binding.spSupplyRefund.dropDownVerticalOffset = 180binding.spSupplyRefund.adapter = adapter}
}

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