Question

我想从片段类中获取mysql db的配置文件详细信息。应显示到textview。比如学生姓名，地址，手机等。我用JSON格式从php发送数据。

这是我的代码

public class ProfileFragment extends Fragment {
private View parentView;
// Session Manager Class
SessionManager session;
TextView student_name;
ArrayList<HashMap<String, String>> oslist = new ArrayList<HashMap<String, String>>();
//URL to get JSON Array
private String url;

//JSON Node Names
private static final String TAG_ARRAY = "student_profile";
private static final String TAG_NAME = "student_name";
JSONArray student_profile = null;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    //return inflater.inflate(R.layout.profile, container, false);
     parentView = inflater.inflate(R.layout.profile, container, false);
     //session.checkLogin();
     session = new SessionManager(getActivity());
     session.checkLogin();
     return parentView;
}   

@Override
public void onActivityCreated(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onActivityCreated(savedInstanceState);
    oslist = new ArrayList<HashMap<String, String>>();
    new JSONParse().execute();  
}

private class JSONParse extends AsyncTask<String, String, JSONObject> {

    private ProgressDialog pDialog;
    JSONParser jParser = new JSONParser();
    private JSONObject json;

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        student_name = (TextView)getView().findViewById(R.id.studentname);
        pDialog = new ProgressDialog(getActivity());
        pDialog.setMessage("Getting Data ...");
        pDialog.setIndeterminate(false);
        pDialog.setCancelable(true);
        pDialog.show();
    }

    @Override
    protected JSONObject doInBackground(String... args) {
        // get user data from session
        HashMap<String, String> user = session.getUserDetails();
        // name
        String emailaddr = user.get(SessionManager.KEY_NAME);
        url = "http://XXXXXXX.org/api/profile.php?emailid="+emailaddr;
        // Getting JSON from URL
        json = jParser.getJSONFromUrl(url);
        return json;
    }

    @Override
    protected void onPostExecute(JSONObject json) {
        pDialog.dismiss();
        try {
             // Getting JSON Array from URL
             student_profile = json.getJSONArray(TAG_ARRAY);
             for(int i = 0; i < student_profile.length(); i++){
                 JSONObject c = student_profile.getJSONObject(i);
                 String student_firstname = null;
                // Storing  JSON item in a Variable
                 String name = c.getString(student_firstname);
                 Toast.makeText(getActivity(), "name="+name, Toast.LENGTH_LONG).show();
             }
        } catch (JSONException e) {
          e.printStackTrace();
        }
    }
}

我收到了这样的错误

12-24 09:29:44.817: W/System.err(30999): org.json.JSONException: No value for student_profile

12-24 09：29：44.818：W / System.err（30999）：at org.json.JSONObject.get（JSONObject.java:355） 12-24 09：29：44.819：W / System.err（30999）：at org.json.JSONObject.getJSONArray（JSONObject.java:549） 12-24 09：29：44.819：W / System.err（30999）：at com.tutorialsface.ResideMenuDemo.ProfileFragment $ JSONParse.onPostExecute（ProfileFragment.java:89）

Answer 1

我认为你的json没有TAG_ARRAY的值。所以它给出了JSONException。您应首先检查以下值：

if (json.has(TAG_ARRAY)) {
 student_profile = json.getJSONArray(TAG_ARRAY);
}

然后它不会产生JSONException。

如何从android片段类中的mysql获取数据？

1 个答案: