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;@Overrideprotected 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 {@Overridepublic 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);}@Overridepublic int getCount() {if (mArrayList==null) {return 0;} else {return (mArrayList.size()+1);}}@Overridepublic Object getItem(int position) {if (mArrayList==null) {return null;} else {if (position>0) {return mArrayList.get(position-1);} else {return mArrayList.get(position+1);}}}@Overridepublic long getItemId(int position) {return position;}///////////////////////////////////////////////////////@Overridepublic int getViewTypeCount() {return TYPE_COUNT;}@Overridepublic int getItemViewType(int position) {if (position==0) {return FIRST_TYPE;} else {return OTHERS_TYPE;}}   ///////////////////////////////////////////////////////    @Overridepublic 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() {@Overridepublic 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;    }}