Android，抽象ArrayAdapter与ViewHolder之间的代码

MagicArrayAdapter.java

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

/**
 * @author solo
 */
public abstract class MagicArrayAdapter<T> extends ArrayAdapter<T> {

    private final LayoutInflater mInflater;
    private final int mResource;

    public MagicArrayAdapter(Context context, int resource) {
        super(context, resource);
        mResource = resource;
        mInflater = LayoutInflater.from(context);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        MagicViewHolder<T> h;
        if (convertView == null) {
            convertView = mInflater.inflate(mResource, parent, false);
            h = getViewHolder(position, convertView, parent);
            convertView.setTag(h);
        } else {
            h = (MagicViewHolder<T>) convertView.getTag();
        }
        h.populateView(position, convertView, parent, getItem(position));
        return convertView;
    }

    abstract public MagicViewHolder<T> getViewHolder(int position, View convertView, ViewGroup parent);

}

MagicViewHolder.java

import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;

/**
 * @author solo
 */
public abstract class MagicViewHolder<T>  {

    public MagicViewHolder(View view) {
      
    }

    /**
     * 更新AdapterView的每个item
     */
    abstract public void populateView(int position, View convertView, ViewGroup parent, T item);
    
}