第六次作业

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.listviewzy.MainActivity" >

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

</RelativeLayout>

<?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="horizontal" >

    <ImageView
        android:id="@+id/Iv"
        android:layout_width="70dp"
        android:layout_height="70dp"
        />
     <TextView 
         android:id="@+id/tv"
         android:layout_width="match_parent"
         android:layout_height="70dp"
         android:layout_marginLeft="10dp"
         android:gravity="center_vertical"
         android:textSize="25dp"
        />

     
</LinearLayout>

package com.example.listviewzy;


import java.util.ArrayList;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ListView;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ListView lv = (ListView) findViewById(R.id.lv);
        ArrayList<String> datas = new ArrayList<String>();
        datas.add("京东商城");datas.add("QQ");datas.add("QQ斗地主");datas.add("新浪微博");
        datas.add("天猫");datas.add("UC浏览器");datas.add("微信");
        ArrayList<Integer> imgdatas = new ArrayList<Integer>();
        imgdatas.add(R.drawable.a1);imgdatas.add(R.drawable.a2);imgdatas.add(R.drawable.a3);
        imgdatas.add(R.drawable.a4);imgdatas.add(R.drawable.a5);imgdatas.add(R.drawable.a6);
        imgdatas.add(R.drawable.a7);
        MyAdapter adapter = new MyAdapter(datas,imgdatas);
        lv.setAdapter(adapter);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

package com.example.listviewzy;

import java.util.ArrayList;

import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

public class MyAdapter extends BaseAdapter {
 
    private ArrayList<String> mData;
    private ArrayList<Integer> mImgdatas;
    public MyAdapter(ArrayList<String> datas, ArrayList<Integer> imgdatas) {
        // TODO Auto-generated constructor stub
        mData = datas;
        mImgdatas = imgdatas;
    }

    class ViewHolder{
        TextView lv;
        ImageView Iv;
        public TextView tv;
        
    }
    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return mData.size();
    }

    @Override
    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub
        ViewHolder holder = null;
        if(convertView==null) {
            LayoutInflater inflater = LayoutInflater.from(parent.getContext());
            convertView  =inflater.inflate(R.layout.lv_asd, null);
            holder = new ViewHolder();
            holder.tv = (TextView) convertView.findViewById(R.id.tv);
            holder.Iv = (ImageView) convertView.findViewById(R.id.Iv);
            convertView.setTag(holder);
        }else {
             holder = (ViewHolder) convertView.getTag();
        }    
        holder.Iv.setBackgroundResource(mImgdatas.get(position));
        holder.tv.setText(mData.get(position));
        return convertView;
    }

}