快速滑动图片一闪一闪的问题，图片加载等处理在这里不介绍，主要就是介绍下在Adapter中维护一个LinkedHashMap解决上述问题
package com.longraise.seller.adapter; import android.content.Context; import android.graphics.Bitmap; import android.graphics.drawable.BitmapDrawable; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.AbsListView; import android.widget.BaseAdapter; import android.widget.ImageView; import android.widget.ListView; import android.widget.TextView; import com.longraise.seller.R; import com.longraise.seller.view.VoiceButton; import java.lang.ref.SoftReference; import java.util.LinkedHashMap; import java.util.List; import java.util.Map; import cc.sdkutil.control.image.CCImageLoader; import cc.sdkutil.control.image.CCImageLoaderCallback; import cc.sdkutil.control.inject.CCInjectUtil; import cc.sdkutil.model.inject.CCInjectRes; /** * Created by wangcong on 15-1-8. */ public class OrderFinishAdapter extends BaseAdapter { //convertview id private final static int BASE_ID = 0x0fff00; private Context mContext; private List<Map<String, Object>> mAllList; //图片加载相关 CCImageLoader mImageLoader; //用于缓存图片，减小快速滑动时图片显示落帧现象 final LinkedHashMap<String, SoftReference<Bitmap>> linkedHashMap; final int MAX_SIZE = 16; public OrderFinishAdapter(Context context, List<Map<String, Object>> list) { this.mContext = context; this.mAllList = list; linkedHashMap = new LinkedHashMap<String, SoftReference<Bitmap>>(16, 0.75f, true) { private static final long serialVersionUID = 1L; @Override protected boolean removeEldestEntry(Entry<String, SoftReference<Bitmap>> eldest) { boolean flag = size() > MAX_SIZE; if (flag) { SoftReference<Bitmap> softReference = eldest.getValue(); Bitmap bitmap = softReference.get(); if (bitmap != null) bitmap.recycle(); remove(eldest.getKey()); } return flag; } }; } public int getCount() { return mAllList.size(); } public Object getItem(int position) { return mAllList.get(position); } public long getItemId(int position) { return position; } @SuppressWarnings("deprecation") public View getView(int position, View convertView, ViewGroup parent) { ViewHolder holder = null; if (convertView == null) { convertView = LayoutInflater.from(mContext).inflate(R.layout.adapter_finish_item, parent, false); holder = new ViewHolder(); CCInjectUtil.inject(holder, convertView); convertView.setTag(holder); } else { holder = (ViewHolder) convertView.getTag(); } convertView.setId(BASE_ID + position); final Map<String, Object> map = mAllList.get(position); //处理图片 SoftReference<Bitmap> softReference = linkedHashMap.get(map.get("orderImgUrl")); Bitmap bitmap = softReference == null ? null : softReference.get(); if (bitmap == null) { holder.image.setBackgroundResource(R.drawable.default_image_error); if (mImageLoader == null) mImageLoader = new CCImageLoader.Builder().needCacheInDisk().outSize(120, 120) .callback(new CCImageLoaderCallback() { @Override public void onSuccess(Bitmap bitmap, Object... objs) { super.onSuccess(bitmap, objs); if (bitmap != null) { //图片加载成功后处理 ImageView imageView = (ImageView) objs[0]; imageView.setBackgroundDrawable(new BitmapDrawable(mContext.getResources(), bitmap)); SoftReference<Bitmap> soft = new SoftReference<Bitmap>(bitmap); linkedHashMap.put(objs[1] + "", soft); bitmap = null; } } }).build(); mImageLoader.loadNetImage(map.get("orderImgUrl") + "", holder.image, map.get("orderImgUrl")); } else { holder.image.setBackgroundDrawable(new BitmapDrawable(mContext.getResources(), bitmap)); } return convertView; } static class ViewHolder { @CCInjectRes(R.id.order_item_image) ImageView image; } }
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