第六次作业listview

<?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"
    android:layout_marginTop="40dp"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <ListView
        android:id="@+id/lv"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent">
        
    </ListView>


</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_marginTop="30dp"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal">

    <ImageView
        android:id="@+id/iv"
        android:layout_width="74dp"
        android:layout_height="64dp"
        android:src="@drawable/a"/>
    <TextView
        android:id="@+id/TV"
        android:layout_width="match_parent"
        android:layout_height="74dp"
        android:gravity="center_horizontal|bottom"
        android:text=""
        android:textSize="20sp"/>


</LinearLayout>

package com.example.myapplication;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class MainActivity extends Activity {
    private ListView listview;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        listview=(ListView)this.findViewById(R.id.lv);

        int[] im = {R.drawable.qq,R.drawable.wx,
                R.drawable.jd,R.drawable.xl,R.drawable.tm,R.drawable.ddz,R.drawable.uc};
        String[] title = {"qq","微信","京东","新浪","天猫","斗地主","UC浏览器"};

        List<Map<String,Object>>listitem=new ArrayList<Map<String, Object>>();
        for(int i=0;i<title.length;i++){
            Map<String,Object>map=new HashMap<String, Object>();
            map.put("image",im[i]);
            map.put("title",title[i]);
            listitem.add(map);
        }
        myAdapter adapter=new myAdapter(this,listitem);
        listview.setAdapter(adapter);
        listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent,
                                    View view, int position, long id) {
                Toast.makeText(MainActivity.this,"正在下载",Toast.LENGTH_SHORT).show();

            }
        });
    }
}
class myAdapter extends BaseAdapter{
    private  Context context;
    private List<Map<String,Object>>listitem;

    public myAdapter(Context context,List<Map<String,Object>>listitem ){
        this.context=context;
        this.listitem=listitem;
    }
    public int getCount(){
        return listitem.size();
    }

    @Override
    public Object getItem(int position) {
        return listitem.get(position);
    }
    public long getItemId(int position){
        return position;
    }
    public View getView(int position,View convertView,ViewGroup parent){
        if(convertView==null){
            convertView=LayoutInflater.from(context).inflate(R.layout.item,null);
        }
        ImageView imageView=(ImageView) convertView.findViewById(R.id.iv);
        TextView textView=(TextView) convertView.findViewById(R.id.TV);

        Map<String,Object>map=listitem.get(position);
        imageView.setImageResource((Integer)map.get("image"));
        textView.setText(map.get("title")+"");
        return convertView;
    }

 

 

}