Android ListView 列表控件

ListView

1.用于ListView的数据源

class xinxi{
public xinxi(String name, String value, int picl){ Name = name; Value = value}
String Name;
String Value;
}

ArrayList<xinxi> arr = new ArrayList<xinxi>();
arr.add(new xinxi("lx","59"));        //增加一个例子

2.用于ListView的数据适配器

class MyAdapter extends BaseAdapter{                                     //数据适配器类
public int getCount() { return arr.size();} //一共有多少条数据
public Object getItem(int position) { return arr.get(position);} //换回指定position位置的对象
public long getItemId(int position) { return position;} ////换回指定position位置的ID
public View getView(int position, View convertView, ViewGroup parent) { //获取一个View 一个项目/条目

ViewHolder holder = null; //使用ViewHolder_性能优化

if(convertView==null){ //复用View_性能优化
convertView = View.inflate(MainActivity.this, R.layout.item1, null);

holder = new ViewHolder();

holder.mytn = (TextView) convertView.findViewById(R.id.Ttxtname);
holder.myti = (ImageView) convertView.findViewById(R.id.Tpicl);
holder.mysc = (Button) convertView.findViewById(R.id.Tbtnsc);

convertView.setTag(holder);

}

holder = (ViewHolder)convertView.getTag();

pot = position; //  private int pot;
holder.mytn.setText(arr.get(position).Name);
holder.myti.setBackgroundResource(arr.get(position).Picl);
holder.mysc.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
arr.remove(pot);
MyAdapter.this.notifyDataSetChanged();
/*
Builder builder = new Builder(MainActivity.this);     // 提示框  %~~
builder.setTitle("你是否确定删除这条数据?");
builder.setNegativeButton("取消", null);
builder.setPositiveButton("确定", new  DialogInterface.OnClickListener(){
public void onClick(DialogInterface dialog, int which) {
arr.remove(MainActivity.this.pot);
MyAdapter.this.notifyDataSetChanged(); //内容发生更改时更新
}});
builder.show();*/
}});
return convertView;
}
}

class ViewHolder{
private TextView mytn;
private ImageView myti;
private Button mysc;
}

3.把数据适配器用于ListView

//ArrayAdapter myAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_expandable_list_item_1, getData());  //simple_expandable_list_item_1::系统自带界面
mylv.setAdapter(myAdapter);          //列表控件 赋予 数据适配器 绑定数据
mylv.setOnItemClickListener(new OnItemClickListener() {           //单击事件
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,long arg3) {
Toast.makeText(getApplicationContext(), "选择："+arg2+"个", Toast.LENGTH_SHORT).show();
}});