先说一下思路，开始让一张放在res/drawable里的图片代替网络图片，加进ListItem，现在显示的就是本地图片，然后新开一个线程循环下载网络图片，每下完一张，替换原来显示的本地图片，更新ListView。

刚开始做的时候，乱配器用的是SimpleAdapter，但是后来发现，SimpleAdapter只能加载事先放在res/drawable，不能加载Bitmap，或者是Drawable，于是写了个适配器来继承SimpleAdapter，加入Bitmap支持，完美实现以上功能。

final ListView list = (ListView) findViewById(R.id.favlv);list.setDivider(null);list.setOnItemClickListener(Click);MyAdapter listItemAdapter;ArrayList<HashMap<String, Object>> listItem = new ArrayList<HashMap<String, Object>>();cursor=db.query("fav",new String[]{"id","title","url","thumb"},null,null,null,null,"id DESC");UrlArr.clear();ThumbArr.clear();ItemID.clear();if(cursor.getCount()>0){nofav.setVisibility(View.INVISIBLE);}while(cursor.moveToNext()){ HashMap<String, Object> map = new HashMap<String, Object>();  map.put("ItemImage",R.drawable.load);//图像资源的ID  map.put("ItemTv",cursor.getString(1));listItem.add(map);UrlArr.add(cursor.getString(2));ThumbArr.add(cursor.getString(3));ItemID.add(cursor.getString(0));}cursor.close();//以上内容是读取数据库，并把数据加到listItem上，没有数据库的自己看着改，ThumbArr存放的是图片URL，另两个是我项目里用的listItemAdapter = new MyAdapter(this,listItem,R.layout.favlv,new String[] {"ItemImage","ItemTv"},new int[] {R.id.ItemImage,R.id.ItemTv});  list.setAdapter(listItemAdapter);list.setOnCreateContextMenuListener(MenuLis);//新开线程循环下载图片new Thread(){@SuppressWarnings("unchecked")public void run(){int i=0;while(i<ThumbArr.size()){try {URL uri = new URL(ThumbArr.get(i));URLConnection conn = uri.openConnection();conn.connect();InputStream is = conn.getInputStream();Bitmap bmp=BitmapFactory.decodeStream(is);is.close();HashMap<String, Object> map = (HashMap<String, Object>)listItemAdapter.getItem(i);map.put("ItemImage",bmp);                        handler.sendEmptyMessage(0);//这个是更新通知就是listItemAdapter.notifyDataSetChanged();} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}i++;}}}.start();

下面的是MyAdapter适配器代码：

package com.BottomMenu;import java.util.List;import java.util.Map;import android.content.Context;import android.graphics.Bitmap;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.Checkable;import android.widget.ImageView;import android.widget.SimpleAdapter;import android.widget.TextView;public class MyAdapter extends SimpleAdapter {private int[] mTo;private String[] mFrom;private ViewBinder mViewBinder;private List<? extends Map<String, ?>> mData;private int mResource;private int mDropDownResource;private LayoutInflater mInflater;public MyAdapter(Context context,List<? extends Map<String, ?>> data, int resource, String[] from,int[] to) {super(context, data, resource, from, to);mData = data;mResource = mDropDownResource = resource;mFrom = from;mTo = to;mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);}/*** @see android.widget.Adapter#getView(int, View, ViewGroup)*/public View getView(int position, View convertView, ViewGroup parent) {return createViewFromResource(position, convertView, parent, mResource);}private View createViewFromResource(int position, View convertView,ViewGroup parent, int resource) {View v;if (convertView == null) {v = mInflater.inflate(resource, parent, false);final int[] to = mTo;final int count = to.length;final View[] holder = new View[count];for (int i = 0; i < count; i++) {holder[i] = v.findViewById(to[i]);}v.setTag(holder);} else {v = convertView;}bindView(position, v);return v;}private void bindView(int position, View view) {final Map dataSet = mData.get(position);if (dataSet == null) {return;}final ViewBinder binder = mViewBinder;final View[] holder = (View[]) view.getTag();final String[] from = mFrom;final int[] to = mTo;final int count = to.length;for (int i = 0; i < count; i++) {final View v = holder[i];if (v != null) {final Object data = dataSet.get(from[i]);//                if(data i)String text = data == null ? "" : data.toString();if (text == null) {text = "";}boolean bound = false;if (binder != null) {bound = binder.setViewValue(v, data, text);}if (!bound) {if (v instanceof Checkable) {if (data instanceof Boolean) {((Checkable) v).setChecked((Boolean) data);} else {throw new IllegalStateException(v.getClass().getName() +" should be bound to a Boolean, not a " + data.getClass());}} else if (v instanceof TextView) {// Note: keep the instanceof TextView check at the bottom of these// ifs since a lot of views are TextViews (e.g. CheckBoxes).setViewText((TextView) v, text);} else if (v instanceof ImageView) {if (data instanceof Integer) {setViewImage((ImageView) v, (Integer) data);                            } else if(data instanceof Bitmap) {setViewImage((ImageView) v, (Bitmap)data);}} else {throw new IllegalStateException(v.getClass().getName() + " is not a " +" view that can be bounds by this SimpleAdapter");}}}}}public void setViewImage(ImageView v, int value) {v.setImageResource(value);}public void setViewImage(ImageView v, Bitmap bm) {((ImageView) v).setImageBitmap(bm);}};