ViewHolder.java

package com.hoollyzhang.hlib.adapter;

import android.content.Context;
import android.graphics.Bitmap;
import android.util.SparseArray;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

/**
 * Created by brzhang on 15/6/8.
 * Description :通用viewhoder
 */
public class ViewHolder {
    private final SparseArray<View> mViews;
    private       View              mConvertView;

    private ViewHolder(Context context, ViewGroup parent, int layoutId) {
        this.mViews = new SparseArray<>();
        mConvertView = LayoutInflater.from(context).inflate(layoutId, parent,
                false);
        mConvertView.setTag(this);
    }

    /**
     * 拿到一个ViewHolder对象
     */
    public static ViewHolder get(Context context, View convertView,ViewGroup parent, int layoutId)
    {
        if (convertView == null)
        {
            return new ViewHolder(context, parent, layoutId);
        }
        return (ViewHolder) convertView.getTag();
    }

    public View getConvertView()
    {
        return mConvertView;
    }

    /**
     * 通过控件的Id获取对于的控件，如果没有则加入views
     * @return
     */
    public <T extends View> T getView(int viewId)
    {
        View view = mViews.get(viewId);
        if (view == null)
        {
            view = mConvertView.findViewById(viewId);
            mViews.put(viewId, view);
        }
        return (T) view;
    }

    /**
     * 为TextView设置字符串
     * @return
     */
    public ViewHolder setText(int viewId, String text)
    {
        TextView view = getView(viewId);
        view.setText(text);
        return this;
    }

    /**
     * 为ImageView设置图片
     * @return
     */
    public ViewHolder setImageResource(int viewId, int drawableId)
    {
        ImageView view = getView(viewId);
        view.setImageResource(drawableId);

        return this;
    }

    /**
     * 为ImageView设置图片
     * @return
     */
    public ViewHolder setImageBitmap(int viewId, Bitmap bm)
    {
        ImageView view = getView(viewId);
        view.setImageBitmap(bm);
        return this;
    }
}