【转】有按钮的ListView(使用自定义Adapter的方法)
转自：http://www.cnblogs.com/allin/archive/2010/05/11/1732200.html
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有时候，列表不光会用来做显示用，我们同样可以在在上面添加按钮。添加按钮首先要写一个有按钮的xml文件，然后自然会想到用上面的方法定义一个适配器，然后将数据映射到布局文件上。但是事实并非这样，因为按钮是无法映射的，即使你成功的用布局文件显示出了按钮也无法添加按钮的响应，这时就要研究一下ListView是如何现实的了，而且必须要重写一个类继承BaseAdapter。下面的示例将显示一个按钮和一个图片，两行字如果单击按钮将删除此按钮的所在行。并告诉你ListView究竟是如何工作的。
效果如下：
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实现如下：
列表项的布局文件vlist2.xml
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="horizontal" android:layout_width="fill_parent" android:layout_height="fill_parent" > <ImageView android:id="@+id/img" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="5px" /> <LinearLayout android:orientation="vertical" android:layout_width="wrap_content" android:layout_height="wrap_content" > <TextView android:id="@+id/title" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textColor="#FFFFFFFF" android:textSize="22px" /> <TextView android:id="@+id/info" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textColor="#FFFFFFFF" android:textSize="13px" /> </LinearLayout> <Button android:id="@+id/view_btn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/s_view_btn" android:layout_gravity="bottom|right" /></LinearLayout>
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程序代码：
/** * @author allin * */public class MyListView4 extends ListActivity {private List<Map<String, Object>> mData;@Overridepublic 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@Overrideprotected 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() {@Overridepublic 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);}@Overridepublic int getCount() {// TODO Auto-generated method stubreturn mData.size();}@Overridepublic Object getItem(int arg0) {// TODO Auto-generated method stubreturn null;}@Overridepublic long getItemId(int arg0) {// TODO Auto-generated method stubreturn 0;}@Overridepublic 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() {@Overridepublic void onClick(View v) {showInfo();}});return convertView;}}}?