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I am trying to send my SQLite data with online MySQL server but to no avail. Naturally, I ran to Google and was lucky enough to find this. Apparently it's supposed to work and it does but I am not receiving the data on my server.

I know this question has been asked here and here, but I haven't been able to patch it up using the suggestions given.

Here is what I have tried. This is how I convert my SQLite data into JSON using GSON:

public String composeJSONfromSQLite() { ArrayList<HashMap<String, String>> offlineList; offlineList = new ArrayList<HashMap<String, String>>(); String selectQuery = "SELECT * FROM offlineTable "; SQLiteDatabase database = this.getWritableDatabase(); Cursor cursor = database.rawQuery(selectQuery, null); if (cursor.moveToFirst()) { do { HashMap<String, String> map = new HashMap<String, String>(); map.put("zip", cursor.getString(1)); map.put("phone", cursor.getString(2)); map.put("uid", cursor.getString(3)); offlineList.add(map); } while (cursor.moveToNext()); } database.close(); Gson gson = new GsonBuilder().create(); //Use GSON to serialize Array List to JSON return gson.toJson(offlineList); } 

And this is how I send it to my server:

public void syncSQLiteMySQLDB() { AsyncHttpClient client = new AsyncHttpClient(); RequestParams params = new RequestParams(); params.put("offline",loadCheckoutDB.composeJSONfromSQLite()); Log.d("offline data log", loadCheckoutDB.composeJSONfromSQLite()); client.addHeader("session_id", getapikey()); client.addHeader("Content-Type", "application/json"); client.post("http://example.com/offline/api", params, new AsyncHttpResponseHandler() { @Override public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) { String s = new String(responseBody); Log.d("response to sync", s); try { JSONObject obj = new JSONObject(s); if (obj.getBoolean("success")) { String success = obj.getString("message"); //Toast.makeText(getApplicationContext(), success, Toast.LENGTH_LONG).show(); } else { String failure = obj.getString("message"); //Toast.makeText(getApplicationContext(), failure, Toast.LENGTH_LONG).show(); } } catch (JSONException e) { } } @Override public void onFailure(int statusCode, Header[] headers, byte[] responseBody, Throwable error) { // Toast.makeText(getApplicationContext(), "Failed to sync with server", Toast.LENGTH_LONG).show(); Log.d("sqlite sync error", String.valueOf(error)); progbar.setVisibility(View.INVISIBLE); } }); } 

And when I log what the JASON looks like from Android I get this format:

[{ "zip": "325, "phone": "78291849", "uid": "14538177211" }] 

But on my server I still get an empty array. What am I doing wrong?

This is how my request format should look like:

{ "offline":[ { "zip": "325, "phone": "78291849", "uid": "14538177211" } ] } 

Here is how I receive the request:

public function massData() // offline sync { $input = Input::all(); return $input; 
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    but currently not sending array on server. do it like client.addHeader("data", loadCheckoutDB.composeJSONfromSQLite()); Commented Jan 28, 2016 at 17:07
  • Thanks for the early response. I tried that and i still get my response as [], an empty array. Commented Jan 28, 2016 at 17:13
  • Show how accessing offline in server side code Commented Jan 28, 2016 at 17:26
  • Stack Snippets aren't relevant to Java code. Please learn from the edits to your other posts. Commented Jul 30, 2016 at 20:43

2 Answers 2

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Add your list to a map where key is offline and value that list:

public String composeJSONfromSQLite() { ArrayList<HashMap<String, String>> offlineList; offlineList = new ArrayList<HashMap<String, String>>(); String selectQuery = "SELECT * FROM offlineTable "; SQLiteDatabase database = this.getWritableDatabase(); Cursor cursor = database.rawQuery(selectQuery, null); if (cursor.moveToFirst()) { do { HashMap<String, String> map = new HashMap<String, String>(); map.put("zip", cursor.getString(1)); map.put("phone", cursor.getString(2)); map.put("uid", cursor.getString(3)); offlineList.add(map); } while (cursor.moveToNext()); } HashMap<String, ArrayList<HashMap<String, String>>> offlineMap = new HashMap<String, ArrayList<HashMap<String, String>>>(); offlineMap.put("offline", offlineList); database.close(); Gson gson = new GsonBuilder().create(); //Use GSON to serialize Array List to JSON return gson.toJson(offlineMap); } 
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Here's how I have done it:

 public void syncSQLiteMySQLDB() { //i get my json string from sqlite, see the code i posted above about this final String json = loadCheckoutDB.composeJSONfromSQLite(); new Thread() { public void run() { makeRequest("http://myexample/offline/api", json); } }.start(); } public void makeRequest(String uri, String json) { try { HttpClient client = new DefaultHttpClient(); HttpPost httpPost = new HttpPost(uri); httpPost.setEntity(new StringEntity(json)); httpPost.setHeader("Accept", "application/json"); httpPost.setHeader("session_id", getapikey()); httpPost.setHeader("Content-type", "application/json"); HttpResponse response = client.execute(httpPost); if (response != null) { String responseBody = EntityUtils.toString(response.getEntity()); Log.d("response to sync", responseBody); Object jsonObj = new JSONTokener(responseBody).nextValue(); if (jsonObj instanceof JSONObject) { JSONObject jsonObject = (JSONObject) jsonObj; //further actions on jsonObjects } else if (jsonObj instanceof JSONArray) { //further actions on jsonArray JSONArray jsonArray = (JSONArray) jsonObj; } } } catch (UnsupportedEncodingException e) { e.printStackTrace(); } catch (ClientProtocolException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } catch (JSONException e) { e.printStackTrace(); } } 

From logging numerous responses I discovered that I was not sending content-type using my previous method. After trying out this code, it worked.

3 Comments

Is there any possible way to implement this using volley?
@shaiToro Using a library removes all the unsafe boilerplate that one writes oneself. Check out okhttp or volley
@shaiToro I tried using volley but couldn't get the content type to application/json. No idea why.

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