检索JSON数组 [英] Retrieving Json Array
本文介绍了检索JSON数组的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我想从以下网址检索值： http://rentopoly.com/ ajax.php？查询=博。我想获得的所有建议的值由一个显示在列表视图之一。这是我想做的事情......
I am trying to retrieve the values from the following url: http://rentopoly.com/ajax.php?query=Bo. I want to get the values of all the suggestions to be displayed in a list view one by one. This is how i want to do...
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();
}
}
下面的适配器code ...
Here's the adapter code...
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;
}
}
这里的logcat的......
Here's the 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)
PLZ帮我分析这个剧本，并以列表形式显示值....
Plz help me parsing this script and displaying the values in list format....
推荐答案
看看这个例子 - 用您试图访问，也基于Android相同的服务
check out this example - uses the same service you are trying to access and is also based on Android.
http://damonsk.com/2010/01/jsonarray-httpclient-android /
这篇关于检索JSON数组的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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