Android中用ListView显示网络下载的Bitmap

//从网络中下载的数据显示在listview中的处理方法，重点是显示bitmap问题的处理，直接粘上代码，以供将来参考。public class ViewDianNao extends Activity {private LinearLayout myListLayout; // 声明LinearLayout类型变量private ListView tripListView;// 声明ListView类型变量private ProgressDialog myDialog;// 声明ProgressDialog类型变量private List<Goods> goodsList;// 声明List类型变量@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);this.setContentView(R.layout.viewdiannao);// 加载viewtuijian.xml资源文件myListLayout = (LinearLayout) this.findViewById(R.id.tripList);// 获取资源文件中的LinearLayouttripListView = new ListView(this);// 创建ListView对象// 创建LinearLayout.LayoutParams类型对象LinearLayout.LayoutParams tripListViewParam = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT,LinearLayout.LayoutParams.FILL_PARENT);tripListView.setCacheColorHint(Color.WHITE);myListLayout.addView(tripListView, tripListViewParam);// 将tripListView添加到myListLayout布局上getGoodsList();// 读取商品列表tripListView.setOnItemClickListener(new OnItemClickListener() {// tripListView列表项单击事件@Overridepublic void onItemClick(AdapterView<?> arg0, View arg1,int position, long id) {// TODO Auto-generated method stubGoods theGood = goodsList.get(position);// 获取当前列表项选中的商品Intent it = new Intent();//创建Intent对象Bundle bundle = new Bundle();//创建Bundle对象it.setClass(ViewDianNao.this, ShangPinDetailView.class);bundle.putSerializable("GoodObj",(Serializable) theGood);it.putExtras(bundle);startActivity(it);}});}// 读取商品列表数据private void getGoodsList() {myDialog = ProgressDialog.show(ViewDianNao.this, "请稍等...", "数据检索中...",true);new Thread() {public void run() {try {goodsList = new ConnectWeb().getTypeList(3);//获取电脑办公类别商品列表，3表示类别为电脑办公Message m = new Message();listHandler.sendMessage(m);} catch (Exception e) {e.printStackTrace();} finally {myDialog.dismiss();}}}.start();}Handler listHandler = new Handler() {public void handleMessage(Message msg) {if (goodsList.size() == 0) {return;}showGoodsList();//填充路书列表适配器}};/** * 填充路书列表适配器 */public void showGoodsList() {SimpleAdapter adapter = new SimpleAdapter(this, getTripList(),R.layout.tuijianrow, new String[] { "img", "name", "money","zhe" }, new int[] { R.id.tripImg, R.id.tripTitle,R.id.tripSegName, R.id.tripProv });tripListView.setAdapter(adapter);//为tripListView添加适配器adapteradapter.setViewBinder(new ViewBinder() {public boolean setViewValue(View arg0, Object arg1,String textRepresentation) {if ((arg0 instanceof ImageView) & (arg1 instanceof Bitmap)) {ImageView imageView = (ImageView) arg0;Bitmap bitmap = (Bitmap) arg1;imageView.setImageBitmap(bitmap);return true;} else {return false;}}});}public List<Map<String, Object>> getTripList() {List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();for (int i = 0; i < goodsList.size(); i += 1) {Map<String, Object> map = new HashMap<String, Object>();Goods goods = goodsList.get(i);try {URL picUrl = new URL(goods.getDir() + "/" + goods.getPic());Bitmap pngBM = BitmapFactory.decodeStream(picUrl.openStream());map.put("img", pngBM);} catch (Exception e) {e.printStackTrace();}map.put("name", "商品名称："+goods.getBrand());map.put("money", "商品价格："+"￥" + goods.getPrice());map.put("zhe", "商品折扣："+goods.getDiscount());list.add(map);}return list;}}
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