在開發中，我們經常使用到ListView這個控件，但ListView自帶适配SimpleAdapter，SimpleCursorAdapter等擴充性比較差（如Button，imageView等），嚴重制約我們的開發。不過Android也提供自定義的擴充卡adapter給我擴充這些控件，下面做個簡單例子（listview裡面含有textview，imageview，button）
1.定義一個資料類，不用資料集，也是為擴充
public class Data {
<span style="white-space:pre"> </span>private int img_id;//圖檔id
<span style="white-space:pre"> </span>private String name;//名字
<span style="white-space:pre"> </span>
<span style="white-space:pre"> </span>public Data(int img_id, String name) {
<span style="white-space:pre"> </span>super();
<span style="white-space:pre"> </span>this.img_id = img_id;
<span style="white-space:pre"> </span>this.name = name;
<span style="white-space:pre"> </span>}
<span style="white-space:pre"> </span>public int getImg_id() {
<span style="white-space:pre"> </span>return img_id;
<span style="white-space:pre"> </span>}
<span style="white-space:pre"> </span>public void setImg_id(int img_id) {
<span style="white-space:pre"> </span>this.img_id = img_id;
<span style="white-space:pre"> </span>}
<span style="white-space:pre"> </span>public String getName() {
<span style="white-space:pre"> </span>return name;
<span style="white-space:pre"> </span>}
<span style="white-space:pre"> </span>public void setName(String name) {
<span style="white-space:pre"> </span>this.name = name;
<span style="white-space:pre"> </span>}<span style="white-space:pre"> </span>
<span style="white-space:pre"> </span>
} 2.每個列需顯示的内容
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#000000" >
<LinearLayout
android:gravity="center"
<span style="white-space:pre"> </span>android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<ImageView
android:layout_width="50dp"
android:layout_height="50dp"
android:id="@+id/img"
android:src="@drawable/ic_launcher"
/>
<TextView
android:id="@+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#ffffff" />
</LinearLayout>
<Button
android:layout_alignParentRight="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/bt"
android:text="@string/comfirm"
/>
</RelativeLayout> 3.自定義擴充卡adapter
public class Adapter extends BaseAdapter{
private Context context;
private int itemLayoutID;
private int[] itemIds;
<span style="white-space:pre"> </span>private List<Data> dataList;
<span style="white-space:pre"> </span>public Adapter(Context context, int itemLayoutID,
int[] itemIds, List<Data> dataList ) {
<span style="white-space:pre"> </span>this.context = context;
this.itemLayoutID = itemLayoutID;
this.itemIds = itemIds;
this.dataList = dataList;
<span style="white-space:pre"> </span> }
@Override
public int getCount() {
// TODO Auto-generated method stub
return dataList.size();
}
@Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return dataList.get(arg0);
}
@Override
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
ViewHolder holder;
if (convertView == null) {//定義每行的布局
LayoutInflater layoutInflater = LayoutInflater.from(context);
convertView = layoutInflater.inflate(itemLayoutID, null);
holder = new ViewHolder();
holder.name = (TextView) convertView
.findViewById(itemIds[1]);
holder.image = (ImageView) convertView
.findViewById(itemIds[0]);
holder.bt = (Button) convertView
.findViewById(itemIds[2]);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
//根據listview的位置擷取資料
final String name = dataList.get(position).getName();
holder.name.setText(name);
holder.image.setImageResource(dataList.get(position).getImg_id());
holder.bt.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
new AlertDialog.Builder(context).setTitle("系統提示")//設定對話框标題
.setMessage(name)//設定顯示的内容
.setPositiveButton("确定",new DialogInterface.OnClickListener() {//添加确定按鈕
@Override
public void onClick(DialogInterface dialog, int which) {//确定按鈕的響應事件
// TODO Auto-generated method stub
}
}).show();//在按鍵響應事件中顯示此對話框
}
});
return convertView;
}
static class ViewHolder {
public TextView name;
public ImageView image;
public Button bt;
} 4.在activity上給listview加載資料
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#000000"
>
<ListView
android:id="@+id/lv"
android:layout_width="match_parent"
android:layout_height="match_parent">
</ListView>
</RelativeLayout> public class MainActivity extends Activity {
private List<Data> dataList;
private int[] img_id = {R.drawable.coffee1,R.drawable.coffee2,
R.drawable.coffee3,R.drawable.coffee4,R.drawable.coffee5};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//初始化資料
dataList = new ArrayList<Data>();
for(int i=0;i<img_id.length;i++){
int img = img_id[i];
String name = this.getResources().getString(R.string.coffee) + i;
Data data = new Data(img, name);
dataList.add(data);
}
// 建立一個自定義Adapter
Adapter adapter = new Adapter(MainActivity.this,R.layout.list_item,
new int[]{R.id.img, R.id.name, R.id.bt}, dataList);
ListView list = (ListView) findViewById(R.id.lv);
// 為ListView設定Adapter
list.setAdapter(adapter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
} 5.最後實作的效果和點選button的效果
自定義adapter已經完成，這也是adapter的一個模闆，具體代碼http://download.csdn.net/detail/qq_29955091/9553940