解決Android快速滑動時圖片一閃一閃問題_Android

快速滑動圖片一閃一閃的問題，圖片載入等處理在這裡不介紹，主要就是介紹下在Adapter中維護一個LinkedHashMap解決上述問題

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;   //圖片載入相關  CCImageLoader mImageLoader;  //用於緩衝圖片，減小快速滑動時圖片顯示落幀現象  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);    //處理圖片    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) { //圖片載入成功後處理                  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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