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POHow to use ProgressBar to show a spinner while waiting a httpResponse from server
 

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  1. POHow to use ProgressBar to show a spinner while waiting a httpResponse from server
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    <p>I'm trying to show a loading icon to the user when the application makes a query to online Database. I've tried using a AnimationDrawable (I gave up because there was no need of a custom icon), ProgressDialog and ProgressBar. The ProgressBar seems most appropriate, since I don't want a message, just a spinning icon. But I can not even make a ProgressBar appear on the screen, doesn't matter where I call it. I've got the ProgressDialog appearing in screen, but it only appears after the server's response, and if I use dismiss() or cancel() it doesn't even appear at all.</p> <p>I've had any success using AsyncTasks or Threads.</p> <p>In the app, there is a class JogarActivity.java that attemps to show a list of options. It receives some parameters like the user id, and calls UserFunctions:</p> <p>public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);</p> <pre><code> setContentView(R.layout.jogar_layout); Intent in = getIntent(); String url = this.getString(R.string.urlSite); ArrayList&lt;HashMap&lt;String, String&gt;&gt; respostaList = new ArrayList&lt;HashMap&lt;String, String&gt;&gt;(); String idt = in.getStringExtra(TAG_ID); primeiraPergunta = in.getBooleanExtra(TAG_PRIMEIRAPERGUNTA, true); TextView insertPergunta = (TextView) findViewById(R.id.insertPergunta); ListView insertRespostas = (ListView) findViewById(R.id.listResposta); SharedPreferences settings = getSharedPreferences("PREFS_LOGIN", MODE_PRIVATE); Integer idUsuario = settings.getInt("idUsuario", 0); String idUser = idUsuario.toString(); if (primeiraPergunta){ UserFunctions userFunction = new UserFunctions(); json = userFunction.getJogar(idt, idUser); }else{ try { json = new JSONArray(in.getStringExtra(TAG_JSON)); json = json.getJSONArray(2); } catch (JSONException e) { e.printStackTrace(); } } </code></pre> <p>Below is the getJogar function in userFunctions: public JSONArray getJogar(String categoria, String usuarioId){ List params = new ArrayList();</p> <pre><code> params.add(new BasicNameValuePair("categoria", categoria)); params.add(new BasicNameValuePair("idUsuario", usuarioId)); JSONArray json = jsonParser.getJSONFromUrl(perguntaURL, params); return json; } </code></pre> <p>JSONParser.java is the class that makes the httpRequest: public JSONArray getJSONFromUrl(String url, List params) {</p> <pre><code> // Making HTTP request try { // defaultHttpClient HttpClient httpClient = new DefaultHttpClient(); HttpPost httpPost = new HttpPost(url); httpPost.setEntity(new UrlEncodedFormEntity(params)); HttpResponse httpResponse = httpClient.execute(httpPost); HttpEntity httpEntity = httpResponse.getEntity(); // json = EntityUtils.toString(httpEntity); // HttpEntity httpEntity2 = httpEntity; json = EntityUtils.toString(httpEntity); // is = httpEntity.getContent(); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } catch (ClientProtocolException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } //then makes the JSON manipulation </code></pre> <p>As long as JSONParser and userFunctions aren't activities, I couldn't use ProgressDialogs inside them (Can't get the application context). All server requests are made in JSONParser.java, that's why i've first tried to put the ProgressDialog/ProgressBar there.</p> <p>The closest that i've reached was using this code in JogarActivity (It shows the ProgressDialog, but after getting server's response. And if I use dismiss, it doesn't even appears)</p> <pre><code> final ProgressDialog loader = new ProgressDialog(JogarActivity.this); loader.show(); //...the if-else code i've pasted above loader.dismiss(); </code></pre> <p>Even using runOnUiThread it doesn't works! I'm getting without options...</p> <p>Thanks for all help.</p>
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    1. USLucas Jota
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    1. COTry to implement AsyncTask. Check the real example [here](http://www.technotalkative.com/loading-remote-images/) and try to implement the same way.
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      1. USParesh Mayani
    2. COUse an `AsyncTask` for this. Do the `ProgressDialog.show` in `onPreExecute` and dismiss the dialog in `onPostExecute` or on exception.
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    3. COI can't use AsyncTask because it doesn't extends Activity, therefore I can't use getApplicationContext() to instantiate a new ProgressDialog/ProgressBar.
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      1. USLucas Jota
 

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