Listview列表的内部点击事件使用

在android中，大家都知道列表的点击事件 setOnItemClickListener()方法,，可以实现对列表项的操作，但是如果你想实现列表项的点击事件，又想实现内部按钮的的点击事件应该怎么办？

那么就需要接口回调。

什么是接口回调呢？

接口回调按我理解的意思是指：接口变量引用了某个界面类的上下文对象，接口变量引用接口里的方法，调用的实现方法体是在对应的哪个界面类使用该接口实现的方法体。

首先在一个适配器中写上一个接口

interface  clickinview
    {
         public void click_one(View view);
         public void click_two(View view);
         public void click_icon(View view);
    }

首先写个简单的布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:orientation="horizontal"
    android:gravity="center"
    android:layout_height="match_parent">
    <ImageView
        android:id="@+id/click_icon"
        android:layout_width="64dp"
        android:layout_height="64dp"
        android:layout_weight="1"
        android:src="@drawable/ic_launcher_background"/>
    <TextView
        android:id="@+id/click_txt"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="第一个记事本"/>

    <TextView
        android:id="@+id/click_txt_two"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="第二个记事本"/>

</LinearLayout>

这里写图片描述

3个控件一个ImageView 2个TextView

适配器

package com.example.administrator.csdn_internal_click;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.List;

/**
 * Created by Administrator on 2018/6/8 0008.
 */

public class Myadapter extends BaseAdapter {
    Context context;
    int layout;
    List<unit_object> list;
    clickinview clickinview;

    public Myadapter(Context context, int layout, List<unit_object> list, clickinview clickinview) {
        this.context = context;
        this.layout = layout;
        this.list = list;
        this.clickinview=clickinview;
    }
    interface  clickinview
    {
         public void click_one(View view);
         public void click_two(View view);
         public void click_icon(View view);
    }

    @Override
    public int getCount() {
        return list.size();
    }

    @Override
    public Object getItem(int position) {
        return list.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
         convertView= LayoutInflater.from(context).inflate(layout,null);
        ImageView imageView=convertView.findViewById(R.id.click_icon);
        TextView txt1=convertView.findViewById(R.id.click_txt);
        TextView txt2=convertView.findViewById(R.id.click_txt_two);
        imageView.setImageResource(list.get(position).getIcon());
        imageView.setTag(position);
        txt1.setText(list.get(position).getTxt1());
          txt1.setTag(position);
        txt2.setText(list.get(position).getTxt2());
        txt2.setTag(position);
        txt1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                clickinview.click_one(v);

            }
        });
        txt2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                clickinview.click_two(v);
            }
        });
        imageView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                clickinview.click_icon(v);
            }
        });

        return convertView;
    }
}

我在适配器中，构造函数加入了一个接口变量，去引用界面对象，然后在适配器中写内部事件的监听器，通过接口变量去调用接口的方法，则会去调用使用接口的类中重写的方法，这就是接口回调。

每个item的内容加载对象

package com.example.administrator.csdn_internal_click;

/**
 * Created by Administrator on 2018/6/8 0008.
 */

public class unit_object {
    private int  icon;
    private String txt1;
    private  String txt2;

    public unit_object(int icon, String txt1, String txt2) {
        this.icon = icon;
        this.txt1 = txt1;
        this.txt2 = txt2;
    }

    public unit_object() {
    }

    public int getIcon() {
        return icon;
    }

    public void setIcon(int icon) {
        this.icon = icon;
    }

    public String getTxt1() {
        return txt1;
    }

    public void setTxt1(String txt1) {
        this.txt1 = txt1;
    }

    public String getTxt2() {
        return txt2;
    }

    public void setTxt2(String txt2) {
        this.txt2 = txt2;
    }
}

主界面

package com.example.administrator.csdn_internal_click;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity  implements  Myadapter.clickinview{
       protected ImageView imageView;
       protected TextView txt_one,txt_two;
       protected ListView listView;
       protected  List<unit_object>  list=new ArrayList<>();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initview();
        list=getData();
        Myadapter myadapter=new Myadapter(MainActivity.this,R.layout.unit_layout,list,MainActivity.this);
         listView.setAdapter(myadapter);
         setListern();
    }

    private void setListern() {
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Toast.makeText(MainActivity.this,"你点击的是:第"+position+"项item",Toast.LENGTH_SHORT).show();
            }
        });
    }

    private void initview() {
        listView=findViewById(R.id.listview);
        imageView=findViewById(R.id.click_icon);
        txt_one=findViewById(R.id.click_txt);
        txt_two=findViewById(R.id.click_txt_two);
    }
    private List<unit_object> getData()
    {     List<unit_object> lists=new ArrayList<>();
         unit_object object=new unit_object(R.drawable.ic_launcher_background,"我是文本1","我是文本2");
         lists.add(object);
         return lists;

    }

    @Override
    public void click_one(View view) {
        int values= (int) view.getTag();
          unit_object object= list.get(values);
           Toast.makeText(MainActivity.this,"你点击的是"+object.getTxt1(),Toast.LENGTH_SHORT).show();


    }

    @Override
    public void click_two(View view) {
        int values= (int) view.getTag();
         unit_object object=list.get(values);
         Toast.makeText(MainActivity.this,"你点击的是"+object.getTxt2(),Toast.LENGTH_SHORT).show();

    }

    @Override
    public void click_icon(View view) {
         int values= (int) view.getTag();
         unit_object object=list.get(values);
        Toast.makeText(MainActivity.this,"你点击的是图片",Toast.LENGTH_SHORT).show();
    }
}