Android自定义adapter的listview

在开发中，我们经常使用到ListView这个控件，但ListView自带适配SimpleAdapter，SimpleCursorAdapter等扩展性比较差（如Button，imageView等），严重制约我们的开发。不过Android也提供自定义的适配器adapter给我扩展这些控件，下面做个简单例子（listview里面含有textview，imageview，button）

1.定义一个数据类，不用数据集，也是为扩展

public class Data {
<span style="white-space:pre">	</span>private int img_id;//图片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.每个列需显示的内容

<?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.自定义适配器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) {//定义每行的布局
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();
}

//根据listview的位置获取数据
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("系统提示")//设置对话框标题
.setMessage(name)//设置显示的内容
.setPositiveButton("确定",new DialogInterface.OnClickListener() {//添加确定按钮
@Override
public void onClick(DialogInterface dialog, int which) {//确定按钮的响应事件
// TODO Auto-generated method stub
}
}).show();//在按键响应事件中显示此对话框
}
});
return convertView;
}

static class ViewHolder {
public TextView name;
public ImageView image;
public Button bt;
}

4.在activity上给listview加载数据

<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);

//初始化数据
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);
}

// 创建一个自定义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);
// 为ListView设置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.最后实现的效果和点击button的效果





自定义adapter已经完成，这也是adapter的一个模板，具体代码http://download.csdn.net/detail/qq_29955091/9553940