Android初级教程 - ListView的基础入门

package com.example.listview;

import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;

//在文中程序的运行步骤已经注明,有疑问可以解开Log日志注释
public class MainActivity extends Activity {

private ListView listView;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//创建ListView 初始化
listView = (ListView) findViewById(R.id.lv);
//给ListView 设置适配器
listView.setAdapter(new MyBaseAdapter());
//ListView快速滚动条
listView.setFastScrollEnabled(true);
}
//自定义MyBaseAdapter继承BaseAdapter(基类)
class MyBaseAdapter extends BaseAdapter{

@Override
public int getCount() {
//最大值, 按我们人类时间大约68年
return Integer.MAX_VALUE;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {

if(convertView==null){
convertView =new TextView(MainActivity.this);
//                Log.d("tag","新创建的对象:"+convertView+"===position="+position);
}else{
//                Log.d("tag", "老对象="+convertView);
4000

}

//TextView textView =new TextView(MainActivity.this);
TextView textView=(TextView) convertView;
textView.setText("List基础入门"+position);
//            Log.d("tag","新创建的对象:"+textView);
//            Log.d("tag", "convertView"+convertView);
return textView;
}
@Override
public Object getItem(int position) {
return null;
}

@Override
public long getItemId(int position) {
return 0;
}

}
}