ListView之ViewHolder类封装

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ViewHolder封装*

package com.pcf.listview.bean;

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 Administrator on 2016/10/29.
*/

public class ViewHolder {
private SparseArray mViews;//存储view，效率比Map高
private int mPosition;
private View mConvertView;

public ViewHolder(Context context, ViewGroup parent, int layoutId, int position) {    this.mPosition = position;    this.mViews = new SparseArray<View>();    mConvertView = LayoutInflater.from(context).inflate(layoutId, parent, false);    mConvertView.setTag(this);}public static ViewHolder get(Context context, View convertView, ViewGroup parent, int layoutId, int position) {    if (convertView == null) {        return new ViewHolder(context, parent, layoutId, position);    } else {        ViewHolder viewHolder = (ViewHolder) convertView.getTag();        viewHolder.mPosition = position;//更新position        return viewHolder;    }}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;}public View getmConvertView() {    return mConvertView;}/** * 返回position * @return */public int getPosition() {    return mPosition;}/** * 设置textview的值 * * @param viewId * @param text * @return */public ViewHolder setText(int viewId, String text) {    TextView tv = getView(viewId);    tv.setText(text);    return this;}/** * 设置图片,传入resurceId * @param viewId * @param resourceId * @return */public ViewHolder setImageResource(int viewId, int resourceId) {    ImageView imageView = getView(viewId);    imageView.setImageResource(resourceId);    return this;}/** * 设置图片，传图bitmap * @param viewId * @param bitmap * @return */public ViewHolder setImageBitmap(int viewId, Bitmap bitmap) {    ImageView imageView = getView(viewId);    imageView.setImageBitmap(bitmap);    return this;}

// public ViewHolder setImageResource(int viewId, String url) {
// ImageView imageView = getView(viewId);
// //Imageloader.getInstance.loadimg(view,url)
// imageView.setImageResource(resourceId);
// return this;
// }
}

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