jjoe64 GraphView disappeared suddenly in AsyncTask

[Leonardo Carreira]

Hi Everyone,

Currently i'm facing an issue on displaying dynamic Graph in a AsyncTask.
The Graph won't showing all of sudden, the data is received correctly from the server (in JSON format).

MainActivity

public class MainActivity extends AppCompatActivity {

    String myJSON;

    private static final String TAG_RESULTS="result";
    private static final String TAG_DATE = "date";
    private static final String TAG_VALUE = "value";

    JSONArray progress = null;
    private static String url_all_progress = "http://192.168.05.127:80/Test/getData.php";

    private SharedPreferences preferenceSettings;
    private ProgressDialog pDialog;

    Date date;
    GraphView graph;
    private View myView = null;

    private PointsGraphSeries<DataPoint> series;
    private DataPoint[] values;
    private ArrayList<HashMap<String, String>> progressList;

    GraphView graphView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        new GetAllProgress(this).execute("3");
    }

    class GetAllProgress extends AsyncTask<String, String, String> {

        private Activity mActivity;

        public GetAllProgress(Activity activity){
            mActivity = activity;
        }

        /**
         * Before starting background thread Show Progress Dialog
         */
        @Override
        protected void onPreExecute() {
            super.onPreExecute();

        }

        /**
         * Getting user details in background thread
         */
        protected String doInBackground(String... params) {
            HttpParams httpParameters = new BasicHttpParams();
            HttpConnectionParams.setConnectionTimeout(httpParameters, 5000);
            HttpConnectionParams.setSoTimeout(httpParameters, 5000);
            HttpClient httpClient = new DefaultHttpClient(httpParameters);
            HttpPost httpPost = new HttpPost(url_all_progress);

            String jsonResult = "";
            try {
                List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(1);
                nameValuePairs.add(new BasicNameValuePair("userID", params[0]));

                httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
                HttpResponse response = httpClient.execute(httpPost);
                jsonResult = inputStreamToString(response.getEntity().getContent()).toString();

                System.out.println("Current UserID Logged In = " + params[0]);
            } catch (ClientProtocolException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } catch (Exception e) {
                //Toast.makeText(mActivity.getApplicationContext(), "Server connection failed", Toast.LENGTH_LONG).show();
                System.err.println("AAAAAAAA = " + e.getMessage());
            }

            if (jsonResult.equals("") || jsonResult == null) {
                //Toast.makeText(mActivity.getApplicationContext(), "Server connection failed", Toast.LENGTH_LONG).show();
                System.err.println("BBBBBBBBBBBBBBBBBB");
                return null;
            }

            return jsonResult;
        }

        /**
         * After completing background task Dismiss the progress dialog
         **/
        protected void onPostExecute(String result) {
            super.onPostExecute(result);
            System.out.println("Resulted Value: " + result);
            myJSON = result;

            JSONObject jsonObj = null;
            series = new PointsGraphSeries<DataPoint>();

            try {
                jsonObj = new JSONObject(myJSON);
                progress = jsonObj.getJSONArray(TAG_RESULTS);
                values = new DataPoint[progress.length()];
                System.out.println("Progress value = " + progress);
                System.out.println("Progress length value = " + progress.length());

                // looping through All Progress
                for (int i = 0; i < progress.length(); i++) {
                    JSONObject c = progress.getJSONObject(i);

                    // Storing each json item in variable
                    SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
                    String date_str = c.getString(TAG_DATE);

                    try {
                        //Parsing received date data
                        date = formatter.parse(date_str);
                    } catch (ParseException e) {
                        e.printStackTrace();
                    }

                    String value_str = c.getString(TAG_VALUE);
                    double value = Double.parseDouble(value_str);

                    DataPoint v = new DataPoint(date, value);
                    values[i] = v;

                    series = new PointsGraphSeries<DataPoint>( new DataPoint[]{
                            new DataPoint(date, 10.00),
                            new DataPoint(date, 50.00)
                    });
                }
                //values = points.toArray(new DataPoint[points.size()]);
                Log.d("values progress", values+"");

                if(progress != null && values !=null && series!=null) {
                    series = new PointsGraphSeries<DataPoint>(values);
                    graph = (GraphView) mActivity.findViewById(R.id.graph);
                    graph.addSeries(series);

                    graph.getViewport().setMaxY(100.00);
                    StaticLabelsFormatter staticLabelsFormatter = new StaticLabelsFormatter(graph);
                    staticLabelsFormatter.setHorizontalLabels(new String[]{date.toString(), "past"});
                    staticLabelsFormatter.setVerticalLabels(new String[]{"10", "20", "30", "40", "50", "60", "70", "80", "90", "100"});
                    graph.getGridLabelRenderer().setLabelFormatter(staticLabelsFormatter);
                    graph.setMinimumWidth(400);
                    graph.setMinimumHeight(400);
                }

            } catch (JSONException e) {
                e.printStackTrace();
            } catch (NullPointerException npe) {
                npe.printStackTrace();
            }

            // dismiss the dialog once got all details
            if ((pDialog != null) && pDialog.isShowing())
                pDialog.dismiss();

        }

        private StringBuilder inputStreamToString(InputStream is) {
            String rLine = "";
            StringBuilder answer = new StringBuilder();
            BufferedReader br = new BufferedReader(new InputStreamReader(is));

            try {
                while ((rLine = br.readLine()) != null) {
                    answer.append(rLine);
                }
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            return answer;
        }
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">

    <com.jjoe64.graphview.GraphView
        android:layout_width="match_parent"
        android:layout_height="200dip"
        android:id="@+id/graph" />

</RelativeLayout>

Please help me on this..
I'd really appreciate it.

Thanks,
With warmest regards,

Leo