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POError parsing data org.json.JSONException: End of input at character 0 of when I run on real device
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copied!<p>I have created an Android application but when I run it on my real device it crashes and I get this in my logcat: </p> <pre><code>05-20 17:32:50.251: E/SensorManager(20804): thread start 05-20 17:32:50.376: E/SpannableStringBuilder(20804): SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length 05-20 17:32:50.376: E/SpannableStringBuilder(20804): SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length 05-20 17:33:01.411: E/JSON Parser(20804): Error parsing data org.json.JSONException: End of input at character 0 of 05-20 17:33:01.416: E/AndroidRuntime(20804): FATAL EXCEPTION: main 05-20 17:33:01.416: E/AndroidRuntime(20804): java.lang.NullPointerException 05-20 17:33:01.416: E/AndroidRuntime(20804): at com.mohammed.watzIslam.LoginActivity$1.onClick(LoginActivity.java:62) 05-20 17:33:01.416: E/AndroidRuntime(20804): at android.view.View.performClick(View.java:4211) 05-20 17:33:01.416: E/AndroidRuntime(20804): at android.view.View$PerformClick.run(View.java:17267) 05-20 17:33:01.416: E/AndroidRuntime(20804): at android.os.Handler.handleCallback(Handler.java:615) 05-20 17:33:01.416: E/AndroidRuntime(20804): at android.os.Handler.dispatchMessage(Handler.java:92) 05-20 17:33:01.416: E/AndroidRuntime(20804): at android.os.Looper.loop(Looper.java:137) 05-20 17:33:01.416: E/AndroidRuntime(20804): at android.app.ActivityThread.main(ActivityThread.java:4898) 05-20 17:33:01.416: E/AndroidRuntime(20804): at java.lang.reflect.Method.invokeNative(Native Method) 05-20 17:33:01.416: E/AndroidRuntime(20804): at java.lang.reflect.Method.invoke(Method.java:511) 05-20 17:33:01.416: E/AndroidRuntime(20804): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006) 05-20 17:33:01.416: E/AndroidRuntime(20804): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773) 05-20 17:33:01.416: E/AndroidRuntime(20804): at dalvik.system.NativeStart.main(Native Method) </code></pre> <p>This is the JSON parser class I use:</p> <pre><code>public class JSONParser { static InputStream is = null; static JSONObject jObj = null; static String json = ""; // constructor public JSONParser() { super(); } public JSONObject getJSONFromUrl(String url, List<NameValuePair> 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> <p>This is the user function (with web service addresses): </p> <pre><code>public class UserFunctions { private JSONParser jsonParser; private static String loginURL = "http://my pc lan adress/android_login_api/include/DB_functions"; private static String registerURL = "http://my pc lan adress/android_login_api/include/DB_functions"; private static String login_tag = "login"; private static String register_tag = "register"; // constructor public UserFunctions() { jsonParser = new JSONParser(); } /** * function make Login Request * @param email * @param password * */ public JSONObject loginUser(String email, String password) { // Building Parameters List<NameValuePair> params = new ArrayList<NameValuePair>(); params.add(new BasicNameValuePair("tag", login_tag)); params.add(new BasicNameValuePair("email", email)); params.add(new BasicNameValuePair("password", password)); JSONObject json = jsonParser.getJSONFromUrl(loginURL, params); // return json // Log.e("JSON", json.toString()); return json; } /** * function make reg. Request * @param name * @param email * @param password * */ public JSONObject registerUser(String name, String password, String email) { // Building Parameters List<NameValuePair> params = new ArrayList<NameValuePair>(); params.add(new BasicNameValuePair("tag", register_tag)); params.add(new BasicNameValuePair("name", name)); params.add(new BasicNameValuePair("email", email)); params.add(new BasicNameValuePair("password", password)); // getting JSON Object JSONObject json = jsonParser.getJSONFromUrl(registerURL, params); // return json return json; } /** * Function get Login status * */ public boolean isUserLoggedIn(Context context) { DatabaseHandler db = new DatabaseHandler(context); int count = db.getRowCount(); if (count > 0) { // user logged in return true; } return false; } /** * Function to logout user * Reset Database * */ public boolean logoutUser(Context context) { DatabaseHandler db = new DatabaseHandler(context); db.resetTables(); return true; } } </code></pre> <p>this is user login.java</p> <pre><code>package com.mohammed.watzIslam; import java.util.HashMap; import org.json.JSONException; import org.json.JSONObject; import com.mohammed.watzIslam.library.DatabaseHandler; import com.mohammed.watzIslam.library.UserFunctions; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; public class LoginActivity extends Activity { Button btnLogin; Button btnLinkToRegister; EditText inputEmail; EditText inputPassword; TextView loginErrorMsg; // JSON Response node names private static String KEY_SUCCESS = "success"; private static String KEY_ERROR = "error"; private static String KEY_ERROR_MSG = "error_msg"; private static String KEY_UID = "id"; private static String KEY_NAME = "name"; private static String KEY_EMAIL = "email"; private static String KEY_CREATED_AT = "created_at"; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.login); // Importing all assets like buttons, text fields inputEmail = (EditText) findViewById(R.id.loginEmail); inputPassword = (EditText) findViewById(R.id.loginPassword); btnLogin = (Button) findViewById(R.id.btnLogin); btnLinkToRegister = (Button) findViewById(R.id.btnLinkToRegisterScreen); loginErrorMsg = (TextView) findViewById(R.id.login_error); // Login button Click Event btnLogin.setOnClickListener(new View.OnClickListener() { public void onClick(View view) { String email = inputEmail.getText().toString(); String password = inputPassword.getText().toString(); UserFunctions userFunction = new UserFunctions(); Log.d("Button", "Login"); JSONObject json = userFunction.loginUser(email, password); // check for login response try { if (json.getString(KEY_SUCCESS) != null) { loginErrorMsg.setText(""); String res = json.getString(KEY_SUCCESS); if(Integer.parseInt(res) == 1){ // user successfully logged in // Store user details in SQLite Database DatabaseHandler db = new DatabaseHandler(getApplicationContext()); JSONObject json_user = json.getJSONObject("user"); // Launch Dashboard Screen Intent applicationinterface = new Intent(getApplicationContext(), Appinterface.class); // Close all views before launching Dashboard applicationinterface.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); startActivity(applicationinterface); // Close Login Screen finish(); }else{ // Error in login loginErrorMsg.setText("Incorrect username/password"); } } } catch (JSONException e) { e.printStackTrace(); } } }); // Link to Register Screen btnLinkToRegister.setOnClickListener(new View.OnClickListener() { public void onClick(View view) { Intent i = new Intent(getApplicationContext(), RegisterActivity.class); startActivity(i); finish(); } }); } } </code></pre> <p>and this is the user register.java</p> <pre><code>package com.mohammed.watzIslam; import org.json.JSONException; import org.json.JSONObject; import com.mohammed.watzIslam.library.DatabaseHandler; import com.mohammed.watzIslam.library.UserFunctions; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.os.StrictMode; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; public class RegisterActivity extends Activity { Button btnRegister; Button btnLinkToLogin; EditText inputFullName; EditText inputEmail; EditText inputPassword; TextView registerErrorMsg; // JSON Response node names private static String KEY_SUCCESS = "success"; private static String KEY_ERROR = "error"; private static String KEY_ERROR_MSG = "error_msg"; private static String KEY_UID = "id"; private static String KEY_NAME = "name"; private static String KEY_EMAIL = "email"; private static String KEY_CREATED_AT = "created_at"; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.register); /*StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build(); StrictMode.setThreadPolicy(policy);*/ // Importing all assets like buttons, text fields inputFullName = (EditText) findViewById(R.id.registerName); inputEmail = (EditText) findViewById(R.id.registerEmail); inputPassword = (EditText) findViewById(R.id.registerPassword); btnRegister = (Button) findViewById(R.id.btnRegister); btnLinkToLogin = (Button) findViewById(R.id.btnLinkToLoginScreen); registerErrorMsg = (TextView) findViewById(R.id.register_error); // Register Button Click event btnRegister.setOnClickListener(new View.OnClickListener() { public void onClick(View view) { String name = inputFullName.getText().toString(); String email = inputEmail.getText().toString(); String password = inputPassword.getText().toString(); UserFunctions userFunction = new UserFunctions(); JSONObject json = userFunction.registerUser(name, email, password); // check for login response try { if (json.getString(KEY_SUCCESS) != null) { registerErrorMsg.setText(""); String res = json.getString(KEY_SUCCESS); if(Integer.parseInt(res) == 1){ // user successfully registred // Store user details in SQLite Database DatabaseHandler db = new DatabaseHandler(getApplicationContext()); JSONObject json_user = json.getJSONObject("user"); // Launch Dashboard Screen Intent applicationinterface = new Intent(getApplicationContext(), Appinterface.class); // Close all views before launching Dashboard applicationinterface.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); startActivity(applicationinterface); // Close Registration Screen finish(); }else{ // Error in registration registerErrorMsg.setText("Error occured in registration"); } } } catch (JSONException e) { e.printStackTrace(); } } }); // Link to Login Screen btnLinkToLogin.setOnClickListener(new View.OnClickListener() { public void onClick(View view) { Intent i = new Intent(getApplicationContext(), LoginActivity.class); startActivity(i); // Close Registration View finish(); } }); } } </code></pre> <p>The web services are currently implemented in PHP and running from a XAMMP server on my local PC. Basically, they just fetch data from a MySQL database and provide user sign up/user login/ website functions.</p> <p>The device is connected to the internet through WiFi from my PC "using connectify".</p> <p>I have been struggling to find an answer but haven't had much success (I'm a new developer and used a lot of code from the internet, with some modifications). Any and all help is appreciated.</p>

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