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); 

   

        } 

    } 

}

 

 

ListViewAdapter如下:

 

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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;      }  }