Android为ListView的Item设置不同的布局

package cc.testlistview;
import java.util.ArrayList;
import java.util.HashMap;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.app.Activity;
/**
* Demo描述:
* 为ListView的Item设置不同的布局.
* 例如在该例子中ListView的第一个Item显示一张
* 图片,其余的Item都显示文字.
*
* 为了达到此目的需要重写BaseAdapter中的
* 1 getViewTypeCount()和getItemViewType(int position)方法.
*   1.1在getViewTypeCount中指定一共有几种不同的item
*      在此返回2即可.
*   1.2在getItemViewType(int position)中需要依据position的不同
*      返回不同的Type.
* 2 在getView()方法中针对不同的Type为Item设置布局
*   2.1得到当前位置(position)时的Type即代码:
*       currentType= getItemViewType(position);
*   2.2依据Type的不同为Item设置布局
*
* 参考资料:
* 1 http://blog.csdn.net/yueyue369/article/details/6115552 * 2 http://blog.sina.com.cn/s/blog_5da93c8f0100wx4v.html *   Thank you very much
*/
public class MainActivity extends Activity {
private ListView mListView;
private HashMap<String, Object> mHashMap;
private ArrayList<HashMap<String, Object>> mArrayList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
init();
}
private void init(){
mArrayList=new ArrayList<HashMap<String,Object>>();
mListView=(ListView) findViewById(R.id.listview);
addDataForListView();
mListView.setAdapter
(new ListViewAdapter(MainActivity.this, mArrayList, R.layout.othersitem, new String []{"content"}, new int []{R.id.textView}));
mListView.setOnItemClickListener(new ItemClickListenerImpl());
}
private void addDataForListView(){
for (int i = 0; i < 30; i++) {
mHashMap=new HashMap<String, Object>();
mHashMap.put("content", "This is ---> "+i);
mArrayList.add(mHashMap);
}
}

private class ItemClickListenerImpl implements OnItemClickListener {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,long arg) {
System.out.println("OnItemClickListener position="+position);

}
}
}

package cc.testlistview;
import java.util.List;
import java.util.Map;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

public class ListViewAdapter extends BaseAdapter {
private List<? extends Map<String, ?>> mArrayList;
private int resource;
private LayoutInflater mLayoutInflater;

private final int TYPE_COUNT=2;
private final int FIRST_TYPE=0;
private final int OTHERS_TYPE=1;
private int currentType;
public ListViewAdapter(Context context,List<? extends Map<String, ?>> data, int resource, String[] from,int[] to) {
this.mArrayList=data;
this.resource=resource;
mLayoutInflater=(LayoutInflater) context.getSystemService(context.LAYOUT_INFLATER_SERVICE);
}

@Override
public int getCount() {
if (mArrayList==null) {
return 0;
} else {
return (mArrayList.size()+1);
}

}

@Override
public Object getItem(int position) {
if (mArrayList==null) {
return null;
} else {
if (position>0) {
return mArrayList.get(position-1);
} else {
return mArrayList.get(position+1);
}
}
}

@Override
public long getItemId(int position) {
return position;
}

///////////////////////////////////////////////////////
@Override
public int getViewTypeCount() {
return TYPE_COUNT;
}

@Override
public int getItemViewType(int position) {
if (position==0) {
return FIRST_TYPE;
} else {
return OTHERS_TYPE;
}
}
///////////////////////////////////////////////////////

@Override
public View getView(int position, View convertView, ViewGroup parent) {
View firstItemView = null;
View othersItemView=null;
//获取到当前位置所对应的Type
currentType= getItemViewType(position);
System.out.println("type="+currentType);
if (currentType== FIRST_TYPE) {
firstItemView = convertView;
FirstItemViewHolder firstItemViewHolder=null;
if (firstItemView==null) {
System.out.println("firstItemView==null ");
firstItemView = mLayoutInflater.inflate(R.layout.firstitem,null);
firstItemView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
System.out.println("=====click first item=======");
}
});
firstItemViewHolder=new FirstItemViewHolder();
firstItemViewHolder.imageView=(ImageView) firstItemView.findViewById(R.id.imageView);
firstItemView.setTag(firstItemViewHolder);

} else {
System.out.println("firstItemView!=null ");
System.out.println("111 getClass="+firstItemView.getTag().getClass().toString());
firstItemViewHolder=(FirstItemViewHolder) firstItemView.getTag();
}

if (firstItemViewHolder.imageView!=null) {
firstItemViewHolder.imageView.setImageResource(R.drawable.ic_launcher);
}

convertView=firstItemView;

} else {
othersItemView = convertView;
OthersViewHolder othersViewHolder=null;
if (othersItemView==null) {
System.out.println("othersItemView==null ");
othersItemView = mLayoutInflater.inflate(R.layout.othersitem,null);
othersViewHolder=new OthersViewHolder();
othersViewHolder.textView=(TextView) othersItemView.findViewById(R.id.textView);
othersItemView.setTag(othersViewHolder);
} else {
System.out.println("othersItemView!=null ");
System.out.println("222 getClass="+othersItemView.getTag().getClass().toString());
othersViewHolder=(OthersViewHolder) othersItemView.getTag();
}

if (mArrayList!=null) {
if (othersViewHolder.textView!=null) {
othersViewHolder.textView.setText((String)(mArrayList.get(position-1).get("content")));
}

}

convertView=othersItemView;

}

return convertView;
}

//第一个Item的ViewHolder
private class FirstItemViewHolder{
ImageView imageView;
}

//除第一个Item以外其余Item的ViewHolder
private class OthersViewHolder{
TextView textView;
}
}