Android 學(xué)習(xí)--ListView 的使用(四)

 基于BaseAdapter 實(shí)現(xiàn)ListView

注意擴(kuò)展BaseAdapter 需要重寫以下四個(gè)方法

getCount();

getItem();

getItemId();

getView();

程序清單

package xiaocool.net.listviewtest;

import android.graphics.Color;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;


public class MainActivity extends ActionBarActivity {

   private ListView list;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.listview2);
        list=(ListView)this.findViewById(R.id.list1);
        /*//定義一個(gè)數(shù)組
        String arr[]={"?？峋W(wǎng)絡(luò)1","?？峋W(wǎng)絡(luò)2","?？峋W(wǎng)絡(luò)3","?？峋W(wǎng)絡(luò)4","?？峋W(wǎng)絡(luò)5"};
        //將數(shù)組包裝成ArrayAdapter
        ArrayAdapter<String> adapter=new ArrayAdapter<String>(this,R.layout.array_item,R.id.textView,arr);
        list.setAdapter(adapter);*/
        BaseAdapter adapter=new BaseAdapter() {
            //返回總的列表項(xiàng)數(shù)
            @Override
            public int getCount() {
                return 20;
            }

            @Override
            public Object getItem(int position) {
                return null;
            }
          //返回列表項(xiàng)的id
            @Override
            public long getItemId(int position) {
                return 0;
            }
           //返回每個(gè)具體item的樣子
            @Override
            public View getView(int position, View convertView, ViewGroup parent) {
               //創(chuàng)建一個(gè)LinearLayout，并向其中添加兩個(gè)控件
                LinearLayout layout=new LinearLayout(MainActivity.this);
                layout.setOrientation(0);
                ImageView p_w_picpathView=new ImageView(MainActivity.this);
                p_w_picpathView.setImageResource(R.drawable.syudio);
                TextView textView=new TextView(MainActivity.this);
                textView.setText("第"+(position+1)+"項(xiàng)");
                textView.setTextColor(Color.BLUE);
                textView.setTextSize(20);
                layout.addView(p_w_picpathView);
                layout.addView(textView);


                return layout;
            }
        };
        list.setAdapter(adapter);
    }



}