Android为ListView的Item设置不同的布局

MainActivity如下:

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);

		}
	}
}

ListViewAdapter如下:

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;
    }
}