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POHow to use jsonwebservices in Android?
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  1. POHow to use jsonwebservices in Android?
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    copied!<p>I want to implement jsonwebservices in my Android app with login page. I don't know how to do it. I have trying but at the run time I got exception <code>RuntimeException</code> and <code>NullpointerException</code> while executing <code>doInBackGround</code>.</p> <p>Here is my Activity code.</p> <pre><code>btnLogin=(Button)findViewById(R.id.button_Login); btnLogin.setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { // TODO Auto-generated method stub if (!isOnline()) { showNoConnectionDialog(Login.this); } else { connectWithHttpGet_LoginData(); } } }); } private void connectWithHttpGet_LoginData() { GetJSONParse getjsonparse = new GetJSONParse(); getjsonparse.execute(); } class GetJSONParse extends AsyncTask&lt;String, Void, JSONObject&gt; { @Override protected void onPreExecute() { super.onPreExecute(); strUserName = etextUsername.getText().toString().trim(); strPassWord = etextPassword.getText().toString().trim(); pDialog = new ProgressDialog(Login.this); pDialog.setIndeterminate(true); pDialog.setCancelable(true); pDialog.show(); System.out.println("Progress Dialog!!!!!!!!!!!!!!!!!!!!!!!"); } @Override protected JSONObject doInBackground(String... args) { String strUrl = "http://test.window2india.com/cms/json/w2iWS"; Log.e("strUrl "," = "+strUrl); JSONParser jParser = new JSONParser(); Log.e("DoinBackground !!!!!","Method"); // Getting JSON from URL JSONObject json = jParser.getJSONFromUrl(strUrl,null); String jsonString=json.toString(); Log.e("jsonString in DoinBackground !!!!!","Method" + jsonString); return json ; } @Override protected void onPostExecute(JSONObject json) { super.onPostExecute(json); pDialog.dismiss(); try { // Getting JSON Array // JSONObject jsonObject = user.getJSONObject(0); json.put(KEY_REQUEST_ID, RequestId); json.put(KEY_REQUEST_CODE, RequestCode); json.put(KEY_CHANNEL_ID, stringChannelId); json.put(KEY_IP_ADDRESS, str_Device_IP_Address); json.put(KEY_USERNAME, strUserName); json.put(KEY_PASSWORD, strPassWord); String jstr = json.toString(); Log.e("in","onPostExecute(String json) = " + jstr); String encrypted1 = EncodeDecodeAES.encrypt(json.toString(), textToEncrypt); System.out.println("encrypted1 =" + encrypted1); JSONObject inner = new JSONObject(); inner.put(KEY_REQUEST, encrypted1); inner.put(KEY_VENDOR_ID, "1"); String decrypted = EncodeDecodeAES.decrypt(json.toString(), encrypted); System.out.println("decrypted =" + decrypted); } catch (JSONException e) { e.printStackTrace(); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } } </code></pre> <p>Here is my Log Cat stack trace. When run the application when I entered any info in text and click on the button at the time of shows progress dialog then and when finish the dialog application is crashed and exception occur.</p> <pre><code>12-06 12:15:29.993: E/AndroidRuntime(595): FATAL EXCEPTION: AsyncTask #2 12-06 12:15:29.993: E/AndroidRuntime(595): java.lang.RuntimeException: An error occured while executing doInBackground() 12-06 12:15:29.993: E/AndroidRuntime(595): at android.os.AsyncTask$3.done(AsyncTask.java:200) 12-06 12:15:29.993: E/AndroidRuntime(595): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:274) 12-06 12:15:29.993: E/AndroidRuntime(595): at java.util.concurrent.FutureTask.setException(FutureTask.java:125) 12-06 12:15:29.993: E/AndroidRuntime(595): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:308) 12-06 12:15:29.993: E/AndroidRuntime(595): at java.util.concurrent.FutureTask.run(FutureTask.java:138) 12-06 12:15:29.993: E/AndroidRuntime(595): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088) 12-06 12:15:29.993: E/AndroidRuntime(595): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581) 12-06 12:15:29.993: E/AndroidRuntime(595): at java.lang.Thread.run(Thread.java:1019) 12-06 12:15:29.993: E/AndroidRuntime(595): Caused by: java.lang.NullPointerException 12-06 12:15:29.993: E/AndroidRuntime(595): at org.apache.http.client.utils.URLEncodedUtils.format(URLEncodedUtils.java:160) 12-06 12:15:29.993: E/AndroidRuntime(595): at org.apache.http.client.entity.UrlEncodedFormEntity.&lt;init&gt;(UrlEncodedFormEntity.java:71) 12-06 12:15:29.993: E/AndroidRuntime(595): at com.window2india.JSONParser.getJSONFromUrl(JSONParser.java:40) 12-06 12:15:29.993: E/AndroidRuntime(595): at com.window2india.Login$GetJSONParse.doInBackground(Login.java:158) 12-06 12:15:29.993: E/AndroidRuntime(595): at com.window2india.Login$GetJSONParse.doInBackground(Login.java:1) 12-06 12:15:29.993: E/AndroidRuntime(595): at android.os.AsyncTask$2.call(AsyncTask.java:185) 12-06 12:15:29.993: E/AndroidRuntime(595): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306) 12-06 12:15:29.993: E/AndroidRuntime(595): ... 4 more 12-06 12:15:32.003: E/WindowManager(595): Activity com.window2india.Login has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@40580198 that was originally added here 12-06 12:15:32.003: E/WindowManager(595): android.view.WindowLeaked: Activity com.window2india.Login has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@40580198 that was originally added here 12-06 12:15:32.003: E/WindowManager(595): at android.view.ViewRoot.&lt;init&gt;(ViewRoot.java:258) 12-06 12:15:32.003: E/WindowManager(595): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:148) 12-06 12:15:32.003: E/WindowManager(595): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91) 12-06 12:15:32.003: E/WindowManager(595): at android.view.Window$LocalWindowManager.addView(Window.java:424) 12-06 12:15:32.003: E/WindowManager(595): at android.app.Dialog.show(Dialog.java:241) 12-06 12:15:32.003: E/WindowManager(595): at com.window2india.Login$GetJSONParse.onPreExecute(Login.java:144) 12-06 12:15:32.003: E/WindowManager(595): at android.os.AsyncTask.execute(AsyncTask.java:391) 12-06 12:15:32.003: E/WindowManager(595): at com.window2india.Login.connectWithHttpGet_LoginData(Login.java:124) 12-06 12:15:32.003: E/WindowManager(595): at com.window2india.Login.access$1(Login.java:121) 12-06 12:15:32.003: E/WindowManager(595): at com.window2india.Login$1.onClick(Login.java:114) 12-06 12:15:32.003: E/WindowManager(595): at android.view.View.performClick(View.java:2485) 12-06 12:15:32.003: E/WindowManager(595): at android.view.View$PerformClick.run(View.java:9080) 12-06 12:15:32.003: E/WindowManager(595): at android.os.Handler.handleCallback(Handler.java:587) 12-06 12:15:32.003: E/WindowManager(595): at android.os.Handler.dispatchMessage(Handler.java:92) 12-06 12:15:32.003: E/WindowManager(595): at android.os.Looper.loop(Looper.java:130) 12-06 12:15:32.003: E/WindowManager(595): at android.app.ActivityThread.main(ActivityThread.java:3683) 12-06 12:15:32.003: E/WindowManager(595): at java.lang.reflect.Method.invokeNative(Native Method) 12-06 12:15:32.003: E/WindowManager(595): at java.lang.reflect.Method.invoke(Method.java:507) 12-06 12:15:32.003: E/WindowManager(595): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 12-06 12:15:32.003: E/WindowManager(595): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 12-06 12:15:32.003: E/WindowManager(595): at dalvik.system.NativeStart.main(Native Method) </code></pre> <p>This is JSONParse code</p> <pre><code>public class JSONParser { static InputStream is = null; static JSONObject jObj = null; static String json = ""; // constructor public JSONParser() { } public JSONObject getJSONFromUrl(String url, List&lt;NameValuePair&gt; params) { // Making HTTP request try { // defaultHttpClient DefaultHttpClient httpClient = new DefaultHttpClient(); HttpPost httpPost = new HttpPost(url); httpPost.setEntity(new UrlEncodedFormEntity(params)); HttpResponse httpResponse = httpClient.execute(httpPost); HttpEntity httpEntity = httpResponse.getEntity(); is = httpEntity.getContent(); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } catch (ClientProtocolException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } try { BufferedReader reader = new BufferedReader(new InputStreamReader( is, "iso-8859-1"), 8); StringBuilder sb = new StringBuilder(); String line = null; while ((line = reader.readLine()) != null) { sb.append(line + "\n"); } is.close(); json = sb.toString(); Log.e("JSON", json); } catch (Exception e) { Log.e("Buffer Error", "Error converting result " + e.toString()); } // try parse the string to a JSON object try { jObj = new JSONObject(json); } catch (JSONException e) { Log.e("JSON Parser", "Error parsing data " + e.toString()); } // return JSON String return jObj; } } </code></pre>
 

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