ListView最基础用法:
给ListView设置一个Adapter
private class MyAdapter extends BaseAdapter
继承Basedapter
重写函数:
public int getCount() ; public View getView(int position, View convertView, ViewGroup parent);
getCount()用于返回List中有多少Item
getView()用于指定那个位置的布局如何:
package com.example.listadaptertest; import java.util.ArrayList; import com.example.listadaptertest.R.id; import android.app.Activity; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.ListView; import android.widget.TextView; public class MainActivity extends Activity { ListView mainListView = null; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mainListView = (ListView) findViewById(id.main_list); mainListView.setAdapter(new MyAdapter()); } // adapter private class MyAdapter extends BaseAdapter { ViewHolder holder; ArrayList<Item> data; public MyAdapter() { data = new ArrayList<MainActivity.Item>(); for (int i = 0; i < 100; i++) { Item item = new Item(i); data.add(item); } } @Override public int getCount() { return data.size(); } @Override public Object getItem(int arg0) { return data.get(arg0); } @Override public long getItemId(int arg0) { return arg0; } @Override public View getView(int position, View convertView, ViewGroup parent) { if (convertView == null) { convertView = LayoutInflater.from(MainActivity.this).inflate(R.layout.list_item, null); holder = new ViewHolder(); holder.tvTitle = (TextView) convertView.findViewById(id.textViewTitle); convertView.setTag(holder); } else { holder = (ViewHolder) convertView.getTag(); } holder.tvTitle.setText("" + data.get(position).id); return convertView; } } // data item private class Item { private int id; public Item(int id) { this.id = id; } } // view item private class ViewHolder { TextView tvTitle; } }
笔记完.