android - 检索 Json 数组

Question

我正在尝试从以下网址检索值:http://rentopoly.com/ajax.php?query=Bo .我想将所有建议的值一一显示在 ListView 中。这就是我想要做的...

public class AlertsAdd {
 public ArrayList <JSONObject> retrieveJSONArray(String urlString) {
  String result = queryRESTurl(urlString);
  ArrayList <JSONObject> ALERTS = new ArrayList <JSONObject> ();
  if (result != null) {

   try {
    JSONObject json = new JSONObject(result);
    JSONArray alertsArray = json.getJSONArray("suggestions");
    for (int a = 0; a < alertsArray.length(); a++) {
     JSONObject alertitem = alertsArray.getJSONObject(a);
     ALERTS.add(alertitem);
    }
    return ALERTS;
   } catch (JSONException e) {
    Log.e("JSON", "There was an error parsing the JSON", e);
   }
  }
  JSONObject myObject = new JSONObject();
  try {
   myObject.put("suggestions", myObject.getJSONArray("suggestions"));
   ALERTS.add(myObject);
  } catch (JSONException e1) {
   Log.e("JSON", "There was an error creating the JSONObject", e1);
  }
  return ALERTS;
 }
 private String queryRESTurl(String url) {
  // URLConnection connection;
  HttpClient httpclient = new DefaultHttpClient();
  HttpGet httpget = new HttpGet(url);
  HttpResponse response;
  try {
   response = httpclient.execute(httpget);
   HttpEntity entity = response.getEntity();
   if (entity != null) {
    InputStream instream = entity.getContent();
    String result = convertStreamToString(instream);
    instream.close();
    return result;
   }
  } catch (ClientProtocolException e) {
   Log.e("REST", "There was a protocol based error", e);
  } catch (IOException e) {
   Log.e("REST", "There was an IO Stream related error", e);
  }
  return null;
 }

 /**
  * To convert the InputStream to String we use the
  * BufferedReader.readLine() method. We iterate until the BufferedReader
  * return null which means there's no more data to read. Each line will
  * appended to a StringBuilder and returned as String.
  */
 private String convertStreamToString(InputStream is) {
  BufferedReader reader = new BufferedReader(new InputStreamReader(is));
  StringBuilder sb = new StringBuilder();

  String line = null;
  try {
   while ((line = reader.readLine()) != null) {
    sb.append(line + "\n");
   }
  } catch (IOException e) {
   e.printStackTrace();
  } finally {
   try {
    is.close();
   } catch (IOException e) {
    e.printStackTrace();
   }
  }
  return sb.toString();
 }
}

这是适配器代码...

public class AlertsAdapter extends ArrayAdapter <JSONObject> {
 public AlertsAdapter(Activity activity, List <JSONObject> alerts) {
  super(activity, 0, alerts);
 }
 @Override
 public View getView(int position, View convertView, ViewGroup parent) {
  Activity activity = (Activity) getContext();
  LayoutInflater inflater = activity.getLayoutInflater();
  View rowView = inflater.inflate(R.layout.list_text, null);
  JSONObject imageAndText = getItem(position);
  TextView textView = (TextView) rowView.findViewById(R.id.last_build_stat);
  try {
   textView.setText((String) imageAndText.get("suggestions"));
  } catch (JSONException e) {
   textView.setText("JSON Exception");
  }
  return rowView;
 }
}

这是 logcat...

    04-30 13:09:46.656: INFO/ActivityManager(584): Starting activity: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10000000 cmp=com.WorldToyota/.Alerts }
04-30 13:09:50.417: ERROR/JSON(924): There was an error parsing the JSON
04-30 13:09:50.417: ERROR/JSON(924): org.json.JSONException: JSONArray[0] is not a JSONObject.
04-30 13:09:50.417: ERROR/JSON(924):     at org.json.JSONArray.getJSONObject(JSONArray.java:268)
04-30 13:09:50.417: ERROR/JSON(924):     at com.WorldToyota.AlertsAdd.retrieveJSONArray(AlertsAdd.java:30)
04-30 13:09:50.417: ERROR/JSON(924):     at com.WorldToyota.Alerts.onCreate(Alerts.java:20)
04-30 13:09:50.417: ERROR/JSON(924):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123)
04-30 13:09:50.417: ERROR/JSON(924):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2364)
04-30 13:09:50.417: ERROR/JSON(924):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2417)
04-30 13:09:50.417: ERROR/JSON(924):     at android.app.ActivityThread.access$2100(ActivityThread.java:116)
04-30 13:09:50.417: ERROR/JSON(924):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794)
04-30 13:09:50.417: ERROR/JSON(924):     at android.os.Handler.dispatchMessage(Handler.java:99)
04-30 13:09:50.417: ERROR/JSON(924):     at android.os.Looper.loop(Looper.java:123)
04-30 13:09:50.417: ERROR/JSON(924):     at android.app.ActivityThread.main(ActivityThread.java:4203)
04-30 13:09:50.417: ERROR/JSON(924):     at java.lang.reflect.Method.invokeNative(Native Method)
04-30 13:09:50.417: ERROR/JSON(924):     at java.lang.reflect.Method.invoke(Method.java:521)
04-30 13:09:50.417: ERROR/JSON(924):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
04-30 13:09:50.417: ERROR/JSON(924):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549)
04-30 13:09:50.417: ERROR/JSON(924):     at dalvik.system.NativeStart.main(Native Method)
04-30 13:09:50.688: ERROR/JSON(924): There was an error creating the JSONObject
04-30 13:09:50.688: ERROR/JSON(924): org.json.JSONException: JSONObject["suggestions"] not found.
04-30 13:09:50.688: ERROR/JSON(924):     at org.json.JSONObject.get(JSONObject.java:287)
04-30 13:09:50.688: ERROR/JSON(924):     at org.json.JSONObject.getJSONArray(JSONObject.java:362)
04-30 13:09:50.688: ERROR/JSON(924):     at com.WorldToyota.AlertsAdd.retrieveJSONArray(AlertsAdd.java:41)
04-30 13:09:50.688: ERROR/JSON(924):     at com.WorldToyota.Alerts.onCreate(Alerts.java:20)
04-30 13:09:50.688: ERROR/JSON(924):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123)
04-30 13:09:50.688: ERROR/JSON(924):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2364)
04-30 13:09:50.688: ERROR/JSON(924):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2417)
04-30 13:09:50.688: ERROR/JSON(924):     at android.app.ActivityThread.access$2100(ActivityThread.java:116)
04-30 13:09:50.688: ERROR/JSON(924):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794)
04-30 13:09:50.688: ERROR/JSON(924):     at android.os.Handler.dispatchMessage(Handler.java:99)
04-30 13:09:50.688: ERROR/JSON(924):     at android.os.Looper.loop(Looper.java:123)
04-30 13:09:50.688: ERROR/JSON(924):     at android.app.ActivityThread.main(ActivityThread.java:4203)
04-30 13:09:50.688: ERROR/JSON(924):     at java.lang.reflect.Method.invokeNative(Native Method)
04-30 13:09:50.688: ERROR/JSON(924):     at java.lang.reflect.Method.invoke(Method.java:521)
04-30 13:09:50.688: ERROR/JSON(924):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
04-30 13:09:50.688: ERROR/JSON(924):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549)
04-30 13:09:50.688: ERROR/JSON(924):     at dalvik.system.NativeStart.main(Native Method)

请帮我解析这个脚本并以列表格式显示值....

Answer 1

查看此示例 - 使用您尝试访问的相同服务并且也是基于 Android。

http://damonsk.com/2010/01/jsonarray-httpclient-android/