JOSN解析数据---从网络

package com.qiao.android13_exe_json;import java.io.BufferedInputStream;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.app.ProgressDialog;import android.content.Context;import android.os.AsyncTask;import android.os.Bundle;import android.util.Log;import android.view.Menu;import android.view.View;import android.widget.AbsListView;import android.widget.AbsListView.OnScrollListener;import android.widget.LinearLayout;import android.widget.ListView;import android.widget.SimpleAdapter;import android.widget.Toast;public class MainActivity extends Activity {private static final String TAG = "MainActivity";private ListView listView_main_title;private LinearLayout layout_main_dian;private int curPage = 1;private String urlString = "http://192.168.125.118:8081/java/json.php?page=";private boolean isButtom = false;// private List<Map<String, String>> listResult = null;private List<Map<String, String>> total = null;private SimpleAdapter adapter = null;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);listView_main_title = (ListView) findViewById(R.id.listView_main_title);layout_main_dian = (LinearLayout) findViewById(R.id.layout_main_dian);total = new ArrayList<Map<String, String>>();Log.i(TAG, "==total" + total);adapter = new SimpleAdapter(this, total, R.layout.item_main_listview,new String[] { "question" },new int[] { R.id.textView_item_title });listView_main_title.setAdapter(adapter);new MyTask(this).execute(urlString);listView_main_title.setOnScrollListener(new OnScrollListener() {@Overridepublic void onScrollStateChanged(AbsListView view, int scrollState) {if (isButtom) {layout_main_dian.setVisibility(View.VISIBLE);} else {layout_main_dian.setVisibility(View.GONE);}}@Overridepublic void onScroll(AbsListView view, int firstVisibleItem,int visibleItemCount, int totalItemCount) {isButtom = (firstVisibleItem + visibleItemCount == totalItemCount);}});}class MyTask extends AsyncTask<String, Void, byte[]> {private Context context;private ProgressDialog dialog;public MyTask(Context context) {this.context = context;dialog = new ProgressDialog(context);dialog.setIcon(R.drawable.ic_launcher);dialog.setTitle("提示");dialog.setMessage("数据加载中");}@Overrideprotected void onPreExecute() {// TODO Auto-generated method stubsuper.onPreExecute();dialog.show();}@Overrideprotected void onProgressUpdate(Void... values) {// TODO Auto-generated method stubsuper.onProgressUpdate(values);}@Overrideprotected byte[] doInBackground(String... params) {BufferedInputStream bis = null;ByteArrayOutputStream baos = new ByteArrayOutputStream();try {URL url = new URL(params[0]);HttpURLConnection connection = (HttpURLConnection) url.openConnection();connection.setDoInput(true);connection.setRequestMethod("GET");connection.connect();InputStream is = connection.getInputStream();int code = connection.getResponseCode();if (code == 200) {bis = new BufferedInputStream(is);int c = 0;byte[] buf = new byte[1024 * 8];while ((c = bis.read(buf)) != -1) {baos.write(buf, 0, c);baos.flush();}return baos.toByteArray();}} catch (MalformedURLException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (ProtocolException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}return null;}@Overrideprotected void onPostExecute(byte[] result) {// TODO Auto-generated method stubsuper.onPostExecute(result);if (result == null) {Toast.makeText(context, "网络访问获取数据失败", Toast.LENGTH_SHORT).show();} else {List<Map<String, String>> listResult = getURLList(result);// Log.i(TAG, "==listResult" + listResult);total.addAll(listResult);// Log.i(TAG, "==total" + total);adapter.notifyDataSetChanged();}dialog.dismiss();}}public void clickButton(View view) {switch (view.getId()) {case R.id.layout_main_dian:layout_main_dian.setVisibility(View.GONE);curPage++;new MyTask(MainActivity.this).execute(urlString + curPage);break;default:break;}}public List<Map<String, String>> getURLList(byte[] b) {// 数据源来自于网络异步访问List<Map<String, String>> list = new ArrayList<Map<String, String>>();String str = new String(b);try {JSONObject jsonObject1 = new JSONObject(str);JSONArray jsonArray1 = jsonObject1.getJSONArray("result");for (int i = 0; i < jsonArray1.length(); i++) {Map<String, String> map = new HashMap<String, String>();JSONObject jsonObject = jsonArray1.getJSONObject(i);String vlaue = jsonObject.getString("question");map.put("question", vlaue);list.add(map);}// Log.i(TAG, "==list" + list);return list;} catch (JSONException e) {// TODO Auto-generated catch blocke.printStackTrace();}return null;}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}}