今天总结一下：
首先客户端从服务器端获取json数据
1、利用HttpUrlConnection
1 /** 2 * 从指定的URL中获取数组 3 * @param urlPath 4 * @return 5 * @throws Exception 6 */ 7 public static String readParse(String urlPath) throws Exception { 8 ByteArrayOutputStream outStream = new ByteArrayOutputStream(); 9 byte[] data = new byte[1024]; 10 int len = 0; 11 URL url = new URL(urlPath); 12 HttpURLConnection conn = (HttpURLConnection) url.openConnection(); 13 InputStream inStream = conn.getInputStream(); 14 while ((len = inStream.read(data)) != -1) { 15 outStream.write(data, 0, len); 16 } 17 inStream.close(); 18 return new String(outStream.toByteArray());//通过out.Stream.toByteArray获取到写的数据 19 }
2、利用HttpClient
1 /** 2 * 访问数据库并返回JSON数据字符串 3 * 4 * @param params 向服务器端传的参数 5 * @param url 6 * @return 7 * @throws Exception 8 */ 9 public static String doPost(List<NameValuePair> params, String url) 10 throws Exception { 11 String result = null; 12 // 获取HttpClient对象 13 HttpClient httpClient = new DefaultHttpClient(); 14 // 新建HttpPost对象 15 HttpPost httpPost = new HttpPost(url); 16 if (params != null) { 17 // 设置字符集 18 HttpEntity entity = new UrlEncodedFormEntity(params, HTTP.UTF_8); 19 // 设置参数实体 20 httpPost.setEntity(entity); 21 } 22 23 /*// 连接超时 24 httpClient.getParams().setParameter( 25 CoreConnectionPNames.CONNECTION_TIMEOUT, 3000); 26 // 请求超时 27 httpClient.getParams().setParameter(CoreConnectionPNames.SO_TIMEOUT, 28 3000);*/ 29 // 获取HttpResponse实例 30 HttpResponse httpResp = httpClient.execute(httpPost); 31 // 判断是够请求成功 32 if (httpResp.getStatusLine().getStatusCode() == 200) { 33 // 获取返回的数据 34 result = EntityUtils.toString(httpResp.getEntity(), "UTF-8"); 35 } else { 36 Log.i("HttpPost", "HttpPost方式请求失败"); 37 } 38 39 return result; 40 }
其次Json数据解析：
json数据：[{"id":"67","biaoTi":"G","logo":"http://www.nuoter.com/wtserver/resources/upload/13508741845270.png","logoLunbo":"http://www.nuoter.com/wtserver/resources/upload/13509015004480.jpg","yuanJia":"0","xianJia":"0"},{"id":"64","biaoTi":"444","logo":"http://www.nuoter.com/wtserver/resources/upload/13508741704400.png","logoLunbo":"http://172.16.1.75:8080/wtserver/resources/upload/13508741738500.png","yuanJia":"0","xianJia":"0"},{"id":"62","biaoTi":"jhadasd","logo":"http://www.nuoter.com/wtserver/resources/upload/13508741500450.png","logoLunbo":"http://172.16.1.75:8080/wtserver/resources/upload/13508741557450.png","yuanJia":"1","xianJia":"0"}]
1 /** 2 * 解析 3 * 4 * @throws JSONException 5 */ 6 private static ArrayList<HashMap<String, Object>> Analysis(String jsonStr) 7 throws JSONException { 8 /******************* 解析 ***********************/ 9 JSONArray jsonArray = null; 10 // 初始化list数组对象 11 ArrayList<HashMap<String, Object>> list = new ArrayList<HashMap<String, Object>>(); 12 jsonArray = new JSONArray(jsonStr); 13 for (int i = 0; i < jsonArray.length(); i++) { 14 JSONObject jsonObject = jsonArray.getJSONObject(i); 15 // 初始化map数组对象 16 HashMap<String, Object> map = new HashMap<String, Object>(); 17 map.put("logo", jsonObject.getString("logo")); 18 map.put("logoLunbo", jsonObject.getString("logoLunbo")); 19 map.put("biaoTi", jsonObject.getString("biaoTi")); 20 map.put("yuanJia", jsonObject.getString("yuanJia")); 21 map.put("xianJia", jsonObject.getString("xianJia")); 22 map.put("id", jsonObject.getInt("id")); 23 list.add(map); 24 } 25 return list; 26 }
最后数据适配：
1、TextView
1 /** 2 * readParse（String）从服务器端获取数据 3 * Analysis（String）解析json数据 4 */ 5 private void resultJson() { 6 try { 7 allData = Analysis(readParse(url)); 8 Iterator<HashMap<String, Object>> it = allData.iterator(); 9 while (it.hasNext()) { 10 Map<String, Object> ma = it.next(); 11 if ((Integer) ma.get("id") == id) { 12 biaoTi.setText((String) ma.get("biaoTi")); 13 yuanJia.setText((String) ma.get("yuanJia")); 14 xianJia.setText((String) ma.get("xianJia")); 15 } 16 } 17 } catch (JSONException e) { 18 e.printStackTrace(); 19 } catch (Exception e) { 20 e.printStackTrace(); 21 } 22 }
2、ListView：
1 /** 2 * ListView 数据适配 3 */ 4 private void product_data(){ 5 List<HashMap<String, Object>> lists = null; 6 try { 7 lists = Analysis(readParse(url));//解析出json数据 8 } catch (Exception e) { 9 // TODO Auto-generated catch block 10 e.printStackTrace(); 11 } 12 List<HashMap<String, Object>> data = new ArrayList<HashMap<String,Object>>(); 13 for(HashMap<String, Object> news : lists){ 14 HashMap<String, Object> item = new HashMap<String, Object>(); 15 item.put("chuXingTianShu", news.get("chuXingTianShu")); 16 item.put("biaoTi", news.get("biaoTi")); 17 item.put("yuanJia", news.get("yuanJia")); 18 item.put("xianJia", news.get("xianJia")); 19 item.put("id", news.get("id")); 20 21 try { 22 bitmap = ImageService.getImage(news.get("logo").toString());//图片从服务器上获取 23 } catch (Exception e) { 24 // TODO Auto-generated catch block 25 e.printStackTrace(); 26 } 27 if(bitmap==null){ 28 Log.i("bitmap", ""+bitmap); 29 Toast.makeText(TravelLine.this, "图片加载错误", Toast.LENGTH_SHORT) 30 .show(); // 显示图片编号 31 } 32 item.put("logo",bitmap); 33 data.add(item); 34 } 35 listItemAdapter = new MySimpleAdapter1(TravelLine.this,data,R.layout.a_travelline_item, 36 // 动态数组与ImageItem对应的子项 37 new String[] { "logo", "biaoTi", 38 "xianJia", "yuanJia", "chuXingTianShu"}, 39 // ImageItem的XML文件里面的一个ImageView,两个TextView ID 40 new int[] { R.id.trl_ItemImage, R.id.trl_ItemTitle, 41 R.id.trl_ItemContent, R.id.trl_ItemMoney, 42 R.id.trl_Itemtoday}); 43 listview.setAdapter(listItemAdapter); 44 //添加点击 45 listview.setOnItemClickListener(new OnItemClickListener() { 46 public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, 47 long arg3) { 48 login_publicchannel_trl_sub(arg2); 49 } 50 }); 51 }
对于有图片的要重写适配器
1 package com.nuoter.adapterUntil; 2 3 4 import java.util.HashMap; 5 import java.util.List; 6 7 8 import android.content.Context; 9 import android.graphics.Bitmap; 10 import android.graphics.BitmapFactory; 11 import android.graphics.Paint; 12 import android.net.Uri; 13 import android.view.LayoutInflater; 14 import android.view.View; 15 import android.view.ViewGroup; 16 import android.widget.BaseAdapter; 17 import android.widget.ImageView; 18 import android.widget.LinearLayout; 19 import android.widget.TextView; 20 21 22 public class MySimpleAdapter1 extends BaseAdapter { 23 private LayoutInflater mInflater; 24 private List<HashMap<String, Object>> list; 25 private int layoutID; 26 private String flag[]; 27 private int ItemIDs[]; 28 public MySimpleAdapter1(Context context, List<HashMap<String, Object>> list, 29 int layoutID, String flag[], int ItemIDs[]) { 30 this.mInflater = LayoutInflater.from(context); 31 this.list = list; 32 this.layoutID = layoutID; 33 this.flag = flag; 34 this.ItemIDs = ItemIDs; 35 } 36 @Override 37 public int getCount() { 38 // TODO Auto-generated method stub 39 return list.size(); 40 } 41 @Override 42 public Object getItem(int arg0) { 43 // TODO Auto-generated method stub 44 return 0; 45 } 46 @Override 47 public long getItemId(int arg0) { 48 // TODO Auto-generated method stub 49 return 0; 50 } 51 @Override 52 public View getView(int position, View convertView, ViewGroup parent) { 53 convertView = mInflater.inflate(layoutID, null); 54 // convertView = mInflater.inflate(layoutID, null); 55 for (int i = 0; i < flag.length; i++) {//备注1 56 if (convertView.findViewById(ItemIDs[i]) instanceof ImageView) { 57 ImageView imgView = (ImageView) convertView.findViewById(ItemIDs[i]); 58 imgView.setImageBitmap((Bitmap) list.get(position).get(flag[i]));///////////关键是这句!!!!!!!!!!!!!!! 59 60 }else if (convertView.findViewById(ItemIDs[i]) instanceof TextView) { 61 TextView tv = (TextView) convertView.findViewById(ItemIDs[i]); 62 tv.setText((String) list.get(position).get(flag[i])); 63 }else{ 64 //...备注2 65 } 66 } 67 //addListener(convertView); 68 return convertView; 69 } 70 71 /* public void addListener(final View convertView) { 72 73 ImageView imgView = (ImageView)convertView.findViewById(R.id.lxs_item_image); 74 75 76 77 } */ 78 79 }
对于图片的获取，json解析出来的是字符串url："logoLunbo":http://www.nuoter.com/wtserver/resources/upload/13509015004480.jpg 从url获取 图片
ImageService工具类
1 package com.nuoter.adapterUntil; 2 3 import java.io.ByteArrayOutputStream; 4 import java.io.InputStream; 5 import java.net.HttpURLConnection; 6 import java.net.URL; 7 8 import android.graphics.Bitmap; 9 import android.graphics.BitmapFactory; 10 11 12 public class ImageService { 13 14 /** 15 * 获取网络图片的数据 16 * @param path 网络图片路径 17 * @return 18 */ 19 public static Bitmap getImage(String path) throws Exception{ 20 21 /*URL url = new URL(imageUrl); 22 HttpURLConnection conn = (HttpURLConnection) url.openConnection(); 23 InputStream is = conn.getInputStream(); 24 mBitmap = BitmapFactory.decodeStream(is);*/ 25 Bitmap bitmap= null; 26 URL url = new URL(path); 27 HttpURLConnection conn = (HttpURLConnection) url.openConnection();//基于HTTP协议连接对象 28 conn.setConnectTimeout(5000); 29 conn.setRequestMethod("GET"); 30 if(conn.getResponseCode() == 200){ 31 InputStream inStream = conn.getInputStream(); 32 bitmap = BitmapFactory.decodeStream(inStream); 33 } 34 return bitmap; 35 } 36 37 /** 38 * 读取流中的数据 从url获取json数据 39 * @param inStream 40 * @return 41 * @throws Exception 42 */ 43 public static byte[] read(InputStream inStream) throws Exception{ 44 ByteArrayOutputStream outStream = new ByteArrayOutputStream(); 45 byte[] buffer = new byte[1024]; 46 int len = 0; 47 while( (len = inStream.read(buffer)) != -1){ 48 outStream.write(buffer, 0, len); 49 } 50 inStream.close(); 51 return outStream.toByteArray(); 52 } 53 54 55 }
上面也将从url处获取网络数据写在了工具类ImageService中方面调用，因为都是一样的。
当然也可以在Activity类中写一个获取服务器图片的函数（当用处不多时）
1 /* 2 3 * 从服务器取图片 4 * 参数：String类型 5 * 返回：Bitmap类型 6 7 */ 8 9 public static Bitmap getHttpBitmap(String urlpath) { 10 Bitmap bitmap = null; 11 try { 12 //生成一个URL对象 13 URL url = new URL(urlpath); 14 //打开连接 15 HttpURLConnection conn = (HttpURLConnection)url.openConnection(); 16 // conn.setConnectTimeout(6*1000); 17 // conn.setDoInput(true); 18 conn.connect(); 19 //得到数据流 20 InputStream inputstream = conn.getInputStream(); 21 bitmap = BitmapFactory.decodeStream(inputstream); 22 //关闭输入流 23 inputstream.close(); 24 //关闭连接 25 conn.disconnect(); 26 } catch (Exception e) { 27 Log.i("MyTag", "error:"+e.toString()); 28 } 29 return bitmap; 30 }
调用：
1 public ImageView pic; 2 ..... 3 ..... 4 allData=Analysis(readParse(url)); 5 Iterator<HashMap<String, Object>> it=allData.iterator(); 6 while(it.hasNext()){ 7 Map<String, Object> ma=it.next(); 8 if((Integer)ma.get("id")==id) 9 { 10 logo=(String) ma.get("logo"); 11 bigpic=getHttpBitmap(logo); 12 } 13 } 14 pic.setImageBitmap(bigpic);
另附 下载数据很慢时建立子线程并传参：
1 new Thread() { 2 @Override 3 public void run() { 4 // 参数列表 5 List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(); 6 nameValuePairs.add(new BasicNameValuePair("currPage", Integer 7 .toString(1))); 8 nameValuePairs.add(new BasicNameValuePair("pageSize", Integer 9 .toString(5))); 10 try { 11 String result = doPost(nameValuePairs, POST_URL); 12 Message msg = handler.obtainMessage(1, 1, 1, result); 13 handler.sendMessage(msg); // 发送消息 14 } catch (Exception e) { 15 // TODO Auto-generated catch block 16 e.printStackTrace(); 17 } 18 } 19 }.start(); 20 21 // 定义Handler对象 22 handler = new Handler() { 23 public void handleMessage(Message msg) { 24 switch (msg.what) { 25 case 1:{ 26 // 处理UI 27 StringBuffer strbuf = new StringBuffer(); 28 List<HashMap<String, Object>> lists = null; 29 try { 30 lists = MainActivity.this 31 .parseJson(msg.obj.toString()); 32 } catch (Exception e) { 33 // TODO Auto-generated catch block 34 e.printStackTrace(); 35 } 36 List<HashMap<String, Object>> data = new ArrayList<HashMap<String,Object>>(); 37 for(HashMap<String, Object> news : lists){ 38 HashMap<String, Object> item = new HashMap<String, Object>(); 39 item.put("id", news.get("id")); 40 item.put("ItemText0", news.get("name")); 41 42 try { 43 bitmap = ImageService.getImage(news.get("logo").toString()); 44 } catch (Exception e) { 45 // TODO Auto-generated catch block 46 e.printStackTrace(); 47 } 48 if(bitmap==null){ 49 Log.i("bitmap", ""+bitmap); 50 Toast.makeText(MainActivity.this, "图片加载错误", Toast.LENGTH_SHORT) 51 .show(); // 显示图片编号 52 } 53 item.put("ItemImage",bitmap); 54 data.add(item); 55 } 56 57 //生成适配器的ImageItem <====> 动态数组的元素，两者一一对应 58 MySimpleAdapter saImageItems = new MySimpleAdapter(MainActivity.this, data, 59 R.layout.d_travelagence_item, 60 new String[] {"ItemImage", "ItemText0", "ItemText1"}, 61 new int[] {R.id.lxs_item_image, R.id.lxs_item_text0, R.id.lxs_item_text1}); 62 //添加并且显示 63 gridview.setAdapter(saImageItems); 64 } 65 break; 66 default: 67 break; 68 } 69 70 71 } 72 };
