Android中Json数据解析，Thread+Handler ，SimpleAdapter使用小案例

1.本代码中的数据是由服务器提供。Json数据解析请参考 http://blog.csdn.net/suren__123/article/details/6938547 。

布局文件十分简单，主要用于小测试，就一份listview控件。

代码如下：

package com.sb.sbbimproject;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.ProtocolException;import java.net.URL;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import org.json.JSONArray;import org.json.JSONException;import org.json.JSONObject;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.util.Log;import android.widget.ListView;import android.widget.SimpleAdapter;public class PendingItemsNewActivity extends Activity {protected static final String TAG ="PendingItemsNewActivity";private String path="http://192.168.31.201:81/JK_Ser/api/Workflow/GetWorkflowList?ProjectId=2";    private   final  List<Map<String, String>> lst = new ArrayList<Map<String, String>>();      private  ListView  lv_newpending;private SimpleAdapter   adapter;private    Handler   handler=new Handler(){public void handleMessage(Message msg) {switch(msg.what){case 1:Log.i(TAG, "解析成功");Log.i(TAG, lst.toString());        adapter.notifyDataSetChanged(); break;case 2:    Log.i(TAG, "解析失败请检查网络");break;}}};@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);setContentView(R.layout.waite_progress_new);lv_newpending=(ListView) findViewById(R.id.lv_newpending);adapter=new  SimpleAdapter(this, lst, android.R.layout.simple_expandable_list_item_1, new String[]{"Name"}, new int[]{android.R.id.text1});lv_newpending.setAdapter(adapter);try {getJSONObject(path);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}/** * 解析json数据 * @param path * @return * @throws Exception */    public  void getJSONObject( final String path) throws Exception {                  new Thread(){         public void run() {        Message msg=Message.obtain();                try {Map<String, String> map = null;  URL url = new URL(path);  HttpURLConnection conn = (HttpURLConnection) url.openConnection();// 利用HttpURLConnection对象,我们可以从网络中获取网页数据.  conn.setConnectTimeout(10 * 1000);   // 单位是毫秒，设置超时时间为5秒  conn.setRequestMethod("GET");        // HttpURLConnection是通过HTTP协议请求path路径的，所以需要设置请求方式,可以不设置，因为默认为GET  if (conn.getResponseCode() == 200) {// 判断请求码是否是200码，否则失败      InputStream is = conn.getInputStream(); // 获取输入流      byte[] data = readStream(is);   // 把输入流转换成字符数组      String json = new String(data);// 把字符数组转换成字符串                  //数据形式：{"total":2,"success":true,"arrayData":[{"id":1,"name":"小猪"},{"id":2,"name":"小猫"}]}          JSONObject jsonObject=new JSONObject(json);     //返回的数据形式是一个Object类型，所以可以直接转换成一个Object          Boolean success=jsonObject.getBoolean("success");          Log.i(TAG,  " | success:" + success);   //测试数据                    JSONArray jsonArray = jsonObject.getJSONArray("data");//里面有一个数组数据，可以用getJSONArray获取数组          for (int i = 0; i < jsonArray.length(); i++) {  JSONObject item = jsonArray.getJSONObject(i); // 得到每个对象String ID=item.getString("ID");  // 获取对象对应的值  String Name = item.getString("Name");  map = new HashMap<String, String>(); // 存放到MAP里面  map.put("ID", ID);  map.put("Name", Name);  lst.add(map);  msg.what=1;        } }} catch (MalformedURLException e) {// TODO Auto-generated catch blocke.printStackTrace();msg.what=2;} catch (ProtocolException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (JSONException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}            finally{                        handler.sendMessage(msg);                                                 }     }               }.start();                   }      /**      * 把输入流转换成字符数组      * @param inputStream   输入流      * @return  字符数组      * @throws Exception      */      public static byte[] readStream(InputStream inputStream) throws Exception {          ByteArrayOutputStream bout = new ByteArrayOutputStream();          byte[] buffer = new byte[1024];          int len = 0;          while ((len = inputStream.read(buffer)) != -1) {              bout.write(buffer, 0, len);          }          bout.close();          inputStream.close();          return bout.toByteArray();      }              @Override    protected void onResume() {    // TODO Auto-generated method stub        super.onResume();    }}

说明： UI只能在主线程中进行进行修改有两种方式，一种是在Handler中进行修改，另外一种如下:

 MainActivity.this.runOnUiThread(new Runnable(){@Overridepublic void run() {//tv.setText(json);}});

在向浏览器发送请求的时候，有时候会需要输入参数的情况，下面的代码，和上面的代码有些类似，只不过添加了两个参数：name和pwd.  如果想写一个登陆功能可参考

http://blog.csdn.net/redarmy_chen/article/details/26860769 。

 /**     * 获取用户的uid     * @param path     */        public void   getData( final String path){         new Thread(){         public void run() {        Message msg=Message.obtain();        try {URL url = new URL(path);  HttpURLConnection conn = (HttpURLConnection) url.openConnection();// 利用HttpURLConnection对象,我们可以从网络中获取网页数据. conn.setConnectTimeout(5 * 1000);   // 单位是毫秒，设置超时时间为5秒   conn.setDoOutput(true);      //设置可以写如数据  conn.setDoInput(true);   //设置可以读出数据conn.setRequestMethod("POST");  // 传递的数据              String Data = "name=" + URLEncoder.encode("admin", "UTF-8")                      + "&pwd=" + URLEncoder.encode("123", "UTF-8");                        //获取输出流              OutputStream os = conn.getOutputStream();              os.write(Data.getBytes());              os.flush();              if (conn.getResponseCode() == 200) {// 判断请求码是否是200码，否则失败      InputStream is = conn.getInputStream(); // 获取输入流      byte[] data = readStream(is);   // 把输入流转换成字符数组  //    String json = new String(data);// 把字符数组转换成字符串      json=new String(data);    msg.what=1; MainActivity.this.runOnUiThread(new Runnable(){@Overridepublic void run() {tv.setText(json);}});}} catch (MalformedURLException e) {// TODO Auto-generated catch blockmsg.what=2;e.printStackTrace();} catch (ProtocolException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}       finally{                            handler.sendMessage(msg);                               }        }     }.start();    

说明：readStream参照上面代码即可。在此使用runOnUiThread 进行UI更新。