今天總結一下：
首先客戶(hù)端從服務(wù)器端獲取json數據
1、利用HttpUrlConnection
1 /** 2 * 從指定的URL中獲取數組 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());//通過(guò)out.Stream.toByteArray獲取到寫(xiě)的數據 19 }
2、利用HttpClient
1 /** 2 * 訪(fǎng)問(wèn)數據庫并返回JSON數據字符串 3 * 4 * @param params 向服務(wù)器端傳的參數 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 // 獲取HttpClient對象13 HttpClient httpClient = new DefaultHttpClient();14 // 新建HttpPost對象15 HttpPost httpPost = new HttpPost(url);16 if (params != null) {17 // 設置字符集18 HttpEntity entity = new UrlEncodedFormEntity(params, HTTP.UTF_8);19 // 設置參數實(shí)體20 httpPost.setEntity(entity);21 }22 23 /*// 連接超時(shí)24 httpClient.getParams().setParameter(25 CoreConnectionPNames.CONNECTION_TIMEOUT, 3000);26 // 請求超時(shí)27 httpClient.getParams().setParameter(CoreConnectionPNames.SO_TIMEOUT,28 3000);*/29 // 獲取HttpResponse實(shí)例30 HttpResponse httpResp = httpClient.execute(httpPost);31 // 判斷是夠請求成功32 if (httpResp.getStatusLine().getStatusCode() == 200) {33 // 獲取返回的數據34 result = EntityUtils.toString(httpResp.getEntity(), "UTF-8");35 } else {36 Log.i("HttpPost", "HttpPost方式請求失敗");37 }38 39 return result;40 }
其次Json數據解析：
json數據：[{"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數組對象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數組對象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 }
最后數據適配：
1、TextView
1 /** 2 * readParse（String）從服務(wù)器端獲取數據 3 * Analysis（String）解析json數據 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 數據適配 3 */ 4 private void product_data(){ 5 List<HashMap<String, Object>> lists = null; 6 try { 7 lists = Analysis(readParse(url));//解析出json數據 8 } catch (Exception e) { 9 // TODO Auto-generated catch block10 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());//圖片從服務(wù)器上獲取23 } catch (Exception e) {24 // TODO Auto-generated catch block25 e.printStackTrace();26 }27 if(bitmap==null){28 Log.i("bitmap", ""+bitmap);29 Toast.makeText(TravelLine.this, "圖片加載錯誤", Toast.LENGTH_SHORT)30 .show(); // 顯示圖片編號31 }32 item.put("logo",bitmap);33 data.add(item);34 }35 listItemAdapter = new MySimpleAdapter1(TravelLine.this,data,R.layout.a_travelline_item,36 // 動(dòng)態(tài)數組與ImageItem對應的子項37 new String[] { "logo", "biaoTi",38 "xianJia", "yuanJia", "chuXingTianShu"},39 // ImageItem的XML文件里面的一個(gè)ImageView,兩個(gè)TextView ID40 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 //添加點(diǎn)擊 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 }
對于有圖片的要重寫(xiě)適配器
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++) {//備注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]));///////////關(guān)鍵是這句!!!!!!!!!!!!!!!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 //...備注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 }
對于圖片的獲取，json解析出來(lái)的是字符串url："logoLunbo":http://www.nuoter.com/wtserver/resources/upload/13509015004480.jpg 從url獲取 圖片
ImageService工具類(lèi)
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 * 獲取網(wǎng)絡(luò )圖片的數據16 * @param path 網(wǎng)絡(luò )圖片路徑17 * @return18 */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協(xié)議連接對象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 * 讀取流中的數據 從url獲取json數據39 * @param inStream40 * @return41 * @throws Exception42 */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 }
上面也將從url處獲取網(wǎng)絡(luò )數據寫(xiě)在了工具類(lèi)ImageService中方面調用，因為都是一樣的。
當然也可以在A(yíng)ctivity類(lèi)中寫(xiě)一個(gè)獲取服務(wù)器圖片的函數（當用處不多時(shí)）
1 /* 2 3 * 從服務(wù)器取圖片 4 * 參數：String類(lèi)型 5 * 返回：Bitmap類(lèi)型 6 7 */ 8 9 public static Bitmap getHttpBitmap(String urlpath) {10 Bitmap bitmap = null;11 try {12 //生成一個(gè)URL對象13 URL url = new URL(urlpath);14 //打開(kāi)連接15 HttpURLConnection conn = (HttpURLConnection)url.openConnection();16 // conn.setConnectTimeout(6*1000);17 // conn.setDoInput(true);18 conn.connect();19 //得到數據流20 InputStream inputstream = conn.getInputStream();21 bitmap = BitmapFactory.decodeStream(inputstream);22 //關(guān)閉輸入流23 inputstream.close();24 //關(guān)閉連接25 conn.disconnect();26 } catch (Exception e) {27 Log.i("MyTag", "error:"+e.toString());28 }29 return bitmap;30 }
調用：
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 下載數據很慢時(shí)建立子線(xiàn)程并傳參：
1 new Thread() { 2 @Override 3 public void run() { 4 // 參數列表 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); // 發(fā)送消息14 } catch (Exception e) {15 // TODO Auto-generated catch block16 e.printStackTrace();17 }18 }19 }.start();20 21 // 定義Handler對象22 handler = new Handler() {23 public void handleMessage(Message msg) {24 switch (msg.what) {25 case 1:{26 // 處理UI27 StringBuffer strbuf = new StringBuffer();28 List<HashMap<String, Object>> lists = null;29 try {30 lists = MainActivity.this31 .parseJson(msg.obj.toString());32 } catch (Exception e) {33 // TODO Auto-generated catch block34 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 block46 e.printStackTrace();47 }48 if(bitmap==null){49 Log.i("bitmap", ""+bitmap);50 Toast.makeText(MainActivity.this, "圖片加載錯誤", Toast.LENGTH_SHORT)51 .show(); // 顯示圖片編號52 }53 item.put("ItemImage",bitmap);54 data.add(item);55 }56 57 //生成適配器的ImageItem <====> 動(dòng)態(tài)數組的元素，兩者一一對應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 //添加并且顯示63 gridview.setAdapter(saImageItems);64 }65 break;66 default:67 break;68 }69 70 71 }72 };
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