J2me: Recommended way to display a significant number of results

Question

I want to ask you if you know about a practical way to display data (maybe in tabular format) from WebService.

I am really new to j2me, I just learned how to consume RESTful web services, now I need to learn how to show this data (which are in json format) to the user.

This is basically the code that I use:

protected String jsonParse(String url) { StringBuffer stringBuffer = new StringBuffer(); InputStream is = null; HttpConnection hc = null; System.out.println(url); String Results = null; try { mProgressString.setText("Connecting..."); hc = (HttpConnection) Connector.open(url, Connector.READ); hc.setRequestMethod(HttpConnection.GET); hc.setRequestProperty("User-Agent", "Profile/MIDP-2.1 Configuration/CLDC-1.1"); if (hc.getResponseCode() == HttpConnection.HTTP_OK) { is = hc.openInputStream(); int ch; while ((ch = is.read()) != -1) { stringBuffer.append((char) ch); } } } catch (SecurityException se) { System.out.println("Security Excepction: " + se); } catch (NullPointerException npe) { System.out.println("Null Pointer Excepction: " + npe); } catch (IOException ioe) { System.out.println("IO Exception" + ioe); } try { hc.close(); is.close(); } catch (Exception e) { System.out.println("Error in MostActivePareser Connection close:" + e); e.printStackTrace(); } String jsonData = stringBuffer.toString(); try { JSONArray js = new JSONArray(jsonData); System.out.println(js.length()); mProgressString.setText("Reading..."); String Results = ""; for (int i = 0; i < js.length(); i++) { JSONObject jsObj = js.getJSONObject(i); Results += "-----------------------------------\n"; Results += jsObj.getString("Name") + " \n"; Results += jsObj.getString("Phone") + " \n"; Results += jsObj.getString("Address"); } } catch (JSONException e1) { System.out.println("Json Data error:" + e1); e1.printStackTrace(); } catch (NullPointerException e) { System.out.println("null error:" + e); } return Results; } 

As you can see, I only concatenate the results so that I can show it to the user later. But, of course, there should be better ways, and here, where I need you, you will help.

How would you display a typical json array in j2me ?? How do you deal with limitations such as limited memory and small screen sizes when you have to work with a significant amount of results?

As always, any advice or resources you could provide would be greatly appreciated.

Thanks in advance.

PS This is jar. I worked with json.

Answer 1

This link is sure to help you figure out JSONArray.

To talk about memory limitations, you are simply trying to clear resources / data structures that you no longer need. The user interface simply keeps the current screen instance alive (if possible), there is no need for other instances on the stack. If your array contains many objects that you cannot display at a time (which can cause problems with OOM), you might consider pagination.

You can get a better idea of ​​memory optimization, from this you should see the presentation .