android ListView详解 源码实例

/** * */ package org.lee.android; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import android.app.AlertDialog; import android.app.ListActivity; import android.content.Context; import android.content.DialogInterface; import android.os.Bundle; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.Button; import android.widget.ImageView; import android.widget.ListView; import android.widget.TextView; /** * @author allin * */ public class MyListView4 extends ListActivity { private List<Map<String, Object>> mData; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mData = getData(); MyAdapter adapter = new MyAdapter(this); setListAdapter(adapter); } private List<Map<String, Object>> getData() { List<Map<String, Object>> list = new ArrayList<Map<String, Object>>(); Map<String, Object> map = new HashMap<String, Object>(); map.put("title", "G1"); map.put("info", "google 1"); map.put("img", R.drawable.i1); list.add(map); map = new HashMap<String, Object>(); map.put("title", "G2"); map.put("info", "google 2"); map.put("img", R.drawable.i2); list.add(map); map = new HashMap<String, Object>(); map.put("title", "G3"); map.put("info", "google 3"); map.put("img", R.drawable.i3); list.add(map); return list; } // ListView 中某项被选中后的逻辑 @Override protected void onListItemClick(ListView l, View v, int position, long id) { Log.v("MyListView4-click", (String)mData.get(position).get("title")); } /** * listview中点击按键弹出对话框 */ public void showInfo(){ new AlertDialog.Builder(this) .setTitle("我的listview") .setMessage("介绍...") .setPositiveButton("确定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { } }) .show(); } public final class ViewHolder{ public ImageView img; public TextView title; public TextView info; public Button viewBtn; } public class MyAdapter extends BaseAdapter{ private LayoutInflater mInflater; public MyAdapter(Context context){ this.mInflater = LayoutInflater.from(context); } @Override public int getCount() { // TODO Auto-generated method stub return mData.size(); } @Override public Object getItem(int arg0) { // TODO Auto-generated method stub return null; } @Override public long getItemId(int arg0) { // TODO Auto-generated method stub return 0; } @Override public View getView(int position, View convertView, ViewGroup parent) { ViewHolder holder = null; if (convertView == null) { holder=new ViewHolder(); convertView = mInflater.inflate(R.layout.vlist2, null); holder.img = (ImageView)convertView.findViewById(R.id.img); holder.title = (TextView)convertView.findViewById(R.id.title); holder.info = (TextView)convertView.findViewById(R.id.info); holder.viewBtn = (Button)convertView.findViewById(R.id.view_btn); convertView.setTag(holder); }else { holder = (ViewHolder)convertView.getTag(); } holder.img.setBackgroundResource((Integer)mData.get(position).get("img")); holder.title.setText((String)mData.get(position).get("title")); holder.info.setText((String)mData.get(position).get("info")); holder.viewBtn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { showInfo(); } }); return convertView; } } }