/*** Get a View that displays the data at the specified position in the data set. You can either* create a View manually or inflate it from an XML layout file. When the View is inflated, the* parent View (GridView, ListView...) will apply default layout parameters unless you use* {@link android.view.LayoutInflater#inflate(int, android.view.ViewGroup, boolean)}* to specify a root view and to prevent attachment to the root.* * @param position The position of the item within the adapter's data set of the item whose view*        we want.* @param convertView The old view to reuse, if possible. Note: You should check that this view*        is non-null and of an appropriate type before using. If it is not possible to convert*        this view to display the correct data, this method can create a new view.*        Heterogeneous lists can specify their number of view types, so that this View is*        always of the right type (see {@link #getViewTypeCount()} and*        {@link #getItemViewType(int)}).* @param parent The parent that this view will eventually be attached to* @return A View corresponding to the data at the specified position.*/View getView(int position, View convertView, ViewGroup parent);

View view;
if(convertView == null){
view = LayoutInfalter.from(getContext()).inflate(resourceID，null)
}
else{
view = convertView
}

//getView核心代码
ViewHolder viewHolder;
if(convertView == null){
viewHolder = new ViewHolder();
viewHolder.fruitImage = (ImageView) view.findViewByID(R.id.fruit_image);
view.setTage(viewHolder);//讲ViewHolder存储在View中}else{
view = convertView;
viewHolder = ViewHolder view.getTag();//重获取viewHolder
}
viewHolder.fruitImage.setImageResource(fruit.getIMageID);//内部类
class ViewHolder{
ImageView fruitImage;
}

/*** Views that were on screen at the start of layout. This array is populated at the start of* layout, and at the end of layout all view in mActiveViews are moved to mScrapViews.* Views in mActiveViews represent a contiguous range of Views, with position of the first* view store in mFirstActivePosition.*/private View[] mActiveViews = new View[0];/*** Unsorted views that can be used by the adapter as a convert view.*/private ArrayList<View>[] mScrapViews;

public View getView(int position, View convertView, ViewGroup parent) {3:     Log.d("MyAdapter", "Position:" + position + "---"4:             + String.valueOf(System.currentTimeMillis()));5:     ViewHolder holder;6:     if (convertView == null) {7:         final LayoutInflater inflater = (LayoutInflater) mContext8:                 .getSystemService(Context.LAYOUT_INFLATER_SERVICE);9:         convertView = inflater.inflate(R.layout.list_item_icon_text, null);10:         holder = new ViewHolder();11:         holder.icon = (ImageView) convertView.findViewById(R.id.icon);12:         holder.text = (TextView) convertView.findViewById(R.id.text);13:         convertView.setTag(holder);14:     } else {15:         holder = (ViewHolder) convertView.getTag();16:     }17:     holder.icon.setImageResource(R.drawable.icon);18:     holder.text.setText(mData[position]);19:     return convertView;20: }21:  22: static class ViewHolder {23:     ImageView icon;24:  25:     TextView text;