Adapter

ViewHolder的封装

public class ViewHolder {

@SuppressWarnings("unchecked")
public static T get(View view, int id) {
SparseArray viewHolder = (SparseArray) view.getTag();
if (viewHolder == null) {
viewHolder = new SparseArray();
view.setTag(viewHolder);
}

View childView = viewHolder.get(id);
if (childView == null) {
childView = view.findViewById(id);
viewHolder.put(id, childView);
}

return (T) childView;
}
}

Adapter的封装

public abstract class BasicAdapter extends BaseAdapter {

protected List mDataList;
protected Context mContext;
protected LayoutInflater mInflater;

public BasicAdapter(Context context, List dataList) {
protected List mDataList;
protected Context mContext;
protected LayoutInflater mInflater;

public BasicAdapter(Context context, List dataList) {
mContext = context;
mDataList = dataList;
mInflater = LayoutInflater.from(context);
}

@Override
public int getCount() {
return mDataList.size();
}

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

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

@Override
public View getView(int position, View convertView, ViewGroup parent) {
return null;
}
}