Android中 ListView：响应item内部按钮点击事件（Kotlin语言）
item内部按钮点击事件
- 前言
- 效果图
- 实现过程
-
- 1、布局文件
-
- （1）布局文件contact
- （2）布局文件friends_item.xml
- 2、适配器FriendsAdapter
- 3、contact.kt文件
- 4、源码
前言
在上篇文章中我们已经实现了ListView中OnitemClick的点击事件，接下来将对item添加按钮点击事件，实现点击按钮删除所在的item。
效果图
实现过程
1、布局文件
（1）布局文件contact
布局未改变，只有标题栏和一个ListView
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#F0F8FF">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/white">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="60dp"
android:background="#009FCC"
android:gravity="center"
android:orientation="vertical">
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:gravity="center_horizontal"
android:text="联系人"
android:textColor="#ffffff"
android:textFontWeight="30"
android:textSize="25dp" />
</LinearLayout>
</RelativeLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/white">
<ListView
android:id="@+id/lv"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</RelativeLayout>
</LinearLayout>
</FrameLayout>
（2）布局文件friends_item.xml
在Button添加了一个属性android:focusable=”false” ，不让Button强制获取item的焦点
<?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"
android:orientation="vertical"
android:background="#F0F8FF"
android:descendantFocusability="blocksDescendants">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/white"
android:orientation="horizontal"
android:padding="10dp">
<ImageView
android:id="@+id/image"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_gravity="center_vertical"
android:layout_marginLeft="10dp"
/>
<TextView
android:id="@+id/title"
android:layout_width="110dp"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_marginLeft="10dp"
android:textSize="19dp"
android:textColor="@color/black"/>
<Button
android:id="@+id/delete_friends"
android:focusable="false"
android:focusableInTouchMode="false"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_marginLeft="155dp"
android:background="@color/white"
android:drawableLeft="@drawable/delete" />
</LinearLayout>
</LinearLayout>
2、适配器FriendsAdapter
自定义适配器FriendsAdapter.kt,使用了接口回调，当点击删除按钮的时候，将点击item的position作为参数传到contact
package com.example.we_chatting
import android.content.Context
import android.view.ViewGroup
import android.view.LayoutInflater
import android.view.View
import android.widget.*
import android.widget.TextView
import android.widget.BaseAdapter
class FriendsAdapter(context: Context, list: List<Friends>, resourceId: Int) :
BaseAdapter() {
private val context: Context
//定义数据源
private val list: List<Friends>
//定义布局资源Id
private val resourceId: Int
private var viewHolder: ViewHolder? = null
override fun getCount(): Int {
return list.size
}
// 获得某一位置的数据
override fun getItem(position: Int): Any {
return list[position]
}
//获得唯一标识
override fun getItemId(position: Int): Long {
return position.toLong()
}
override fun getView(position: Int, view: View?, viewGroup: ViewGroup?): View? {
var view = view
if (view == null) {
view = LayoutInflater.from(context).inflate(resourceId, null)
viewHolder = ViewHolder()
viewHolder!!.friendImage = view.findViewById<View>(R.id.image) as ImageView
viewHolder!!.friendName = view.findViewById<View>(R.id.title) as TextView
viewHolder!!.mButton = view.findViewById<View>(R.id.delete_friends) as Button
view.tag = viewHolder
} else {
viewHolder = view.tag as ViewHolder
}
viewHolder!!.friendImage!!.setImageResource(list[position].friendsimageId)
viewHolder!!.friendName!!.text = list[position].friendsname
viewHolder!!.mButton!!.setOnClickListener(View.OnClickListener {
mOnItemDeleteListener?.onDeleteClick(
position
)
})
return view
}
/*
删除好友的监听接口
*/
interface onItemDeleteListener {
fun onDeleteClick(position: Int)
}
private var mOnItemDeleteListener: onItemDeleteListener? = null
fun setOnItemDeleteClickListener(mOnItemDeleteListener: onItemDeleteListener?) {
this.mOnItemDeleteListener = mOnItemDeleteListener
}
internal inner class ViewHolder {
var friendImage: ImageView? = null
var friendName: TextView? = null
var mButton: Button?=null
}
init {
this.context = context
this.list = list
this.resourceId = resourceId
}
}
3、contact.kt文件
package com.example.we_chatting
import android.app.AlertDialog
import android.os.Bundle
import android.support.v4.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.*
import java.util.*
class contact : Fragment() {
val friendslist = ArrayList<Friends>()
var listView: ListView? = null
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View {
val page: View = inflater.inflate(R.layout.fragment_contact, container, false)
listView = page.findViewById<View>(R.id.lv) as ListView
//初始化
initfriend()
val adapter = getContext()?.let {
FriendsAdapter(
it, friendslist,
R.layout.friends_item)
}
listView!!.adapter = adapter
listView!!.setOnItemClickListener { parent, view, position, id ->
val friend = friendslist[position]
// Toast.makeText(getActivity(), fruit.friendsname ,Toast.LENGTH_SHORT).show()
val alertdialogbuilder: AlertDialog.Builder = AlertDialog.Builder(getActivity())
alertdialogbuilder.setMessage("您确认要与 " + friend.friendsname + " 聊天吗？")
alertdialogbuilder.setPositiveButton("确定", null)
alertdialogbuilder.setNeutralButton("取消", null)
val alertdialog1: AlertDialog = alertdialogbuilder.create()
alertdialog1.show()
}
//删除好友
adapter!!.setOnItemDeleteClickListener(object : FriendsAdapter.onItemDeleteListener {
override fun onDeleteClick(i: Int) {
friendslist.removeAt(i)
adapter.notifyDataSetChanged()
}
})
return page
}
private fun initfriend() {
repeat(2) {
friendslist.add(Friends("卷王1", R.drawable.friend1))
friendslist.add(Friends("卷王2", R.drawable.friend1))
friendslist.add(Friends("卷王3", R.drawable.friend1))
friendslist.add(Friends("卷王4", R.drawable.friend1))
friendslist.add(Friends("卷王5", R.drawable.friend1))
friendslist.add(Friends("卷王6", R.drawable.friend1))
friendslist.add(Friends("卷王7", R.drawable.friend1))
friendslist.add(Friends("卷王8", R.drawable.friend1))
friendslist.add(Friends("卷王9", R.drawable.friend1))
friendslist.add(Friends("卷王10", R.drawable.friend1))
friendslist.add(Friends("卷王11", R.drawable.friend1))
friendslist.add(Friends("卷王12", R.drawable.friend1))
}
}
}
4、源码
源码可通过此链接下载，如果有任何问题可在评论区告诉我，最后感谢你的阅读啦！！