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; } }