Android/Java: how to delay return in a method

Question

I want to build a Utils class to make Volley calls simpler, like this:

Utils.java:

public class Utils {
static JsonObjectRequest mJsonObjectRequest;          


        

Answer 1

I created this and managed like the following way please have a look, hope it will be useful to you

public class APIManager {



    public static void createRequest(Context c, String requestTag,
            String endPoint, List params,
            final OnRequestCompletedListener listener,
            TransParentProgressDialog pd) {
        ServerDetails serverDetails = new ServerDetails(c, endPoint, params);
        JsonObjectRequest request = new JsonObjectRequest(Method.GET,
                serverDetails.getQueryUrl(), null,
                new Response.Listener() {

                    @Override
                    public void onResponse(JSONObject response) {
                        listener.onRequestCompleted(response);
                    }
                }, getErrorListener(c, pd)) {

        };
        AppController.getInstance().addToRequestQueue(request, requestTag);
    }

public static ErrorListener getErrorListener(final Context c,
            final TransParentProgressDialog pd, final TextView tvEmpty,
            final String errorText) {

        Response.ErrorListener listener = new Response.ErrorListener() {

            @Override
            public void onErrorResponse(VolleyError error) {
                if (pd != null && pd.isShowing()) {
                    pd.dismiss();
                }
                if (tvEmpty != null) {
                    tvEmpty.setText(errorText);
                }
                MyDialog dialog;
                Log.d("volley-error", error.toString());

                if (error instanceof TimeoutError) {
                    dialog = new MyDialog(c, "Server Timeout");
                    dialog.show();
                    return;
                } else if (error instanceof NoConnectionError) {
                    dialog = new MyDialog(c, "No Connection or Invalid Url");
                    dialog.show();
                    return;

                } else if (error instanceof ServerError) {
                    NetworkResponse response = error.networkResponse;
                    if (response != null) {
                        // int statusCode = response.statusCode;
                        byte[] data = response.data;
                        if (data != null) {
                            String str = new String(data);
                            try {
                                JSONObject object = new JSONObject(str);
                                Log.d("error response", object.toString());
                                if (object.has("errors")) {
                                    JSONArray errors = object
                                            .getJSONArray("errors");
                                    JSONObject errorObject = errors
                                            .getJSONObject(0);
                                    dialog = new MyDialog(c, "Error!",
                                            errorObject.getString("message"));
                                    dialog.show();
                                } else {
                                    dialog = new MyDialog(c, "Error!",
                                            object.toString());
                                    dialog.show();
                                }
                            } catch (JSONException e) {
                                e.printStackTrace();
                                dialog = new MyDialog(c, "Error!", "Error");
                                dialog.show();
                            }
                        } else {
                            dialog = new MyDialog(c, "Server Error");
                            dialog.show();
                        }
                    } else {
                        dialog = new MyDialog(c, "Server Error");
                        dialog.show();
                    }

                } else if (error instanceof NetworkError) {
                    NetworkResponse response = error.networkResponse;
                    if (response != null) {
                        // int statusCode = response.statusCode;
                        byte[] data = response.data;
                        if (data != null) {
                            String str = new String(data);
                            try {
                                JSONObject object = new JSONObject(str);
                                Log.d("error response", object.toString());
                                if (object.has("errors")) {
                                    JSONArray errors = object
                                            .getJSONArray("errors");
                                    JSONObject errorObject = errors
                                            .getJSONObject(0);
                                    dialog = new MyDialog(c, "Error!",
                                            errorObject.getString("message"));
                                    dialog.show();
                                } else {
                                    dialog = new MyDialog(c, "Error!",
                                            object.toString());
                                    dialog.show();
                                }
                            } catch (JSONException e) {
                                e.printStackTrace();
                                dialog = new MyDialog(c, "Error!", "Error");
                                dialog.show();
                            }
                        } else {
                            dialog = new MyDialog(c, "Network Error");
                            dialog.show();
                        }
                    } else {
                        dialog = new MyDialog(c, "Network Error");
                        dialog.show();
                    }
                } else if (error instanceof ParseError) {
                    dialog = new MyDialog(c, "Parse Error");
                    dialog.show();
                } else if (error instanceof AuthFailureError) {
                    NetworkResponse response = error.networkResponse;
                    if (response != null) {
                        // int statusCode = response.statusCode;
                        byte[] data = response.data;
                        if (data != null) {
                            String str = new String(data);
                            try {
                                JSONObject object = new JSONObject(str);
                                Log.d("error response", object.toString());
                                if (object.has("errors")) {
                                    JSONArray errors = object
                                            .getJSONArray("errors");
                                    JSONObject errorObject = errors
                                            .getJSONObject(0);
                                    dialog = new MyDialog(c, "Error!",
                                            errorObject.getString("message"));
                                    dialog.show();
                                } else {
                                    dialog = new MyDialog(c, "Error!",
                                            object.toString());
                                    dialog.show();
                                }
                            } catch (JSONException e) {
                                e.printStackTrace();
                                dialog = new MyDialog(c, "Error!", "Error");
                                dialog.show();
                            }
                        } else {
                            dialog = new MyDialog(c, "Error!", "Error");
                            dialog.show();
                        }
                    } else {
                        dialog = new MyDialog(c, "Error connecting server");
                        dialog.show();
                    }
                }
            }
        };
        return listener;
    }
}

And the interface for call back on request completed is

public interface OnRequestCompletedListener {

        public void onRequestCompleted(JSONObject response);
    }