Android Adapter简单封装

CommonAdapter类

import java.util.List;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;

/**
 * author:
 * email:j
 * 类说明 
 * @param <T>
 */
public abstract class CommonAdapter<T>  extends BaseAdapter {

    protected List<T> mDatas;
    protected LayoutInflater mInflater;  
    protected Context mContext; 
    protected int layoutId;
    
    public CommonAdapter(Context ctx,List<T> lists,int layoutId){
        this.mDatas=lists;
        mInflater=(LayoutInflater)     ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        this.mContext=ctx;
        this.layoutId=layoutId;
    }
    
    @Override
    public int getCount() {
        return mDatas.size();
    }

    @Override
    public Object getItem(int position) {
        return mDatas.get(position);
    }

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder vh=ViewHolder.getViewHolder(convertView, mContext, parent, layoutId, position);
        convert(vh, mDatas.get(position));
        return vh.getConvertView();
    }
    
    abstract protected void convert(ViewHolder vh,T item);

}        

ViewHolder类

import android.content.Context;
import android.util.SparseArray;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

/**
 * author: 
 * email:
 * 类说明 
 */
public class ViewHolder {

   private final SparseArray<View> mView;    
   private View mConvertView;
   
   public ViewHolder(Context context, ViewGroup parent, int layoutId, int position){
       this.mView=new SparseArray<View>();
       mConvertView = LayoutInflater.from(context).inflate(layoutId, parent, false);  
       mConvertView.setTag(this);
   };
   
   /**
    * 获得viewholder
    * @param convertView
    * @param context
    * @param parent
    * @param layoutId
    * @param position
    * @return
    */
   public static ViewHolder getViewHolder(View convertView,Context context,ViewGroup parent, int layoutId, int position){
       if(null==convertView){
           return new ViewHolder(context, parent, layoutId, position);
       }
       return (ViewHolder) convertView.getTag();
   }
   
   /**
    * @param id
    * @return
    */
   public  <T extends View> T getView(int id){
       View view=mView.get(id);
       if(null==view){
           view=mConvertView.findViewById(id);
           mView.put(id,view);
       }
       return (T)view;
   }
   
   public View getConvertView(){
       return mConvertView;
   }
}

嗯，就这两个类，可以任意继承拓展。