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

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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;}

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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();    }});