View difference between Paste ID: NSu2R27S and uzDFu3Qn

 /**
  * A login screen that offers login via username/password
  */
 public class LoginActivity extends ActionBarActivity
 {
    // Keep track of the login task to ensure we can cancel it if requested.
   private UserLoginTask mAuthTask = null;
 
   // UI references.
   private AutoCompleteTextView mNickView;
   private EditText mPasswordView;
   private View mProgressView;
   private View mScrollView;
   private View mSignInButton;
   private View mRegisterButton;
   private AlertDialog mAlertDialog;
   private EditText mMailEditText;
 
   private String mPassword;
   private String mNickname;
 
-  static final String SHARED_PREFERENCES = "SHRD_PREF";
+
-  static final String USER_NICKNAME = "USR_NICK";
+
-  static final String USER_PASSWORD = "USR_PWD";
+
-  private static final String DIALOG_CONTENT = "DIAL_CONT";
+
-  private static final String CLIENT_RESOURCE_REFERENCE = "CR_REFER";
+
 
     findViews();
 
     if (isCredentialsStoredYet())
     {
       attemptLoginOrRegister(UserTasks.LOGIN);
     }
     setListeners();
   }
 
   private void findViews()
   {
     // Find the buttons.
     mSignInButton = findViewById(R.id.activity_login_sign_in_button);
     mRegisterButton = findViewById(R.id.activity_login_register_button);
 
     // Set up the login form.
     mNickView = (AutoCompleteTextView) findViewById(R.id.activity_login_nick);
     mProgressView = findViewById(R.id.activity_login_progress);
     mScrollView = findViewById(R.id.activity_login_scrollview);
     mPasswordView = (EditText) findViewById(R.id.activity_login_password);
   }
 
   private AlertDialog.Builder buildDialog(String mailString)
   {
     final AlertDialog.Builder alertDialogBuilder =
       new AlertDialog.Builder(LoginActivity.this);
 
     alertDialogBuilder.setTitle("Insert mail");
     alertDialogBuilder.setMessage("email");
     // Set an EditText view to get user input
     mMailEditText = new EditText(getApplicationContext());
     if (mailString != null)
       mMailEditText.setText(mailString);
     alertDialogBuilder.setView(mMailEditText);
     alertDialogBuilder.setPositiveButton(
       "Ok", new DialogInterface.OnClickListener()
       {
         public void onClick(DialogInterface dialog, int whichButton)
         {
           String email = mMailEditText.getText().toString();
           if (!TextUtils.isEmpty(email) && !isEmailValid(
             email))
           {
             String s = getString(
               R.string
                 .activity_login_error_invalid_email); //TODO delete this reference
                 // after debug and place it inside setError below
             mMailEditText.setError(s);
             Toast.makeText(getApplicationContext(), "Hi", Toast.LENGTH_SHORT);
           }
           else
           {
             attemptLoginOrRegister(UserTasks.REGISTER, email);
           }
         }
       });
     alertDialogBuilder.setNegativeButton(
       "Cancel", new DialogInterface.OnClickListener()
       {
         public void onClick(DialogInterface dialog, int whichButton)
         {
           dialog.cancel();
         }
       });
 
     mAlertDialog = alertDialogBuilder.create();
     return alertDialogBuilder;
   }
 
   private void setListeners()
   {
     mPasswordView.setOnEditorActionListener(
       new TextView.OnEditorActionListener()
       {
         @Override
         public boolean onEditorAction(
           TextView textView, int id, KeyEvent keyEvent)
         {
           if (id == R.id.activity_login_imeaction
             || id == EditorInfo.IME_NULL)
           {
             attemptLoginOrRegister(UserTasks.LOGIN);
             return true;
           }
           return false;
         }
       });
 
     mSignInButton.setOnClickListener(
       new View.OnClickListener()
       {
         @Override
         public void onClick(View view)
         {
           attemptLoginOrRegister(UserTasks.LOGIN);
         }
       });
 
     mRegisterButton.setOnClickListener(
       new View.OnClickListener()
       {
         @Override
         public void onClick(View v)
         {
           buildDialog(null).show();
         }
       });
   }
 
 
   /* Check if the user has already stored its credentials before
    */
   private boolean isCredentialsStoredYet()
   {
     SharedPreferences sp = getSharedPreferences(
       SHARED_PREFERENCES, MODE_PRIVATE);
 
     mPassword = sp.getString(USER_PASSWORD, null);
     mNickname = sp.getString(USER_NICKNAME, null);
 
     return mPassword != null && mNickname != null;
   }
 
 
   /*
    * Attempts to sign in or register with the account specified by the login
    * form.
    * If there are form errors (invalid email, missing fields, etc.), the
    * errors are presented and no actual login attempt is made.
    */
   private void attemptLoginOrRegister(UserTasks taskType, String... params)
   {
     if (mAuthTask != null) return;
 
     // Reset errors.
     mNickView.setError(null);
     mPasswordView.setError(null);
 
     // Check if the user was already stored
     if (mNickname == null || mPassword == null)
     {
       mNickname = mNickView.getText().toString();
       mPassword = mPasswordView.getText().toString();
     }
 
     // Store values at the time of the login attempt.
     boolean cancel = false;
     View focusView = null;
 
     // Check for a valid password, if the user entered one.
     if (!TextUtils.isEmpty(mPassword) && !isPasswordValid(mPassword))
     {
       mPasswordView.setError(
         getResources().getString(
           R.string.activity_login_error_invalid_password));
       focusView = mPasswordView;
       cancel = true;
     }
 
     // Check for a valid nick.
     if (TextUtils.isEmpty(mNickname))
     {
       mNickView
         .setError(
           getString(R.string.activity_login_error_field_required));
       focusView = mNickView;
       cancel = true;
     }
     else if (!isNickValid(mNickname))
     {
-          //getString(R.string.activity_login_error_field_required));
+
-          "Error");
+
       focusView = mNickView;
       cancel = true;
     }
 
     if (cancel)
     {
       // There was an error; don't attempt login and focus the first
       // form field with an error.
       focusView.requestFocus();
     }
     else
     {
       // Show a progress spinner, and kick off a background task to
       // perform the user login attempt.
       showProgress(true);
       CheckBox checkBox = (CheckBox) findViewById(
         R.id
           .activity_login_remember_checkBox);
       if (checkBox.isChecked())
       { storeCredentials(); }
       mAuthTask = new UserLoginTask(mNickname, mPassword, taskType);
       mAuthTask.execute(params);
     }
   }
 
   private void storeCredentials()
   {
     SharedPreferences.Editor editor = getSharedPreferences
       (SHARED_PREFERENCES, MODE_PRIVATE).edit();
     editor.putString(USER_NICKNAME, mNickname);
     editor.putString(USER_PASSWORD, mPassword);
     editor.apply();
   }
 
   private boolean isNickValid(String nick)
   {
     //Actually, the user can insert any character as nickname
     return nick != null && !nick.isEmpty();
   }
 
   private boolean isEmailValid(String email)
   {
     return email.contains("@") && email.contains(".") && !email.contains(" ");
   }
 
   private boolean isPasswordValid(String password)
   {
     return !(password.length() < 6 || password.contains(" "));
   }
 
   /**
    * Shows the progress UI and hides the login form.
    */
   @TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2)
   public void showProgress(final boolean show)
   {
     // On Honeycomb MR2 we have the ViewPropertyAnimator APIs, which allow
     // for very easy animations. If available, use these APIs to fade-in
     // the progress spinner.
     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2)
     {
       int shortAnimTime =
         getResources().getInteger(android.R.integer.config_shortAnimTime);
 
       mScrollView.setVisibility(show ? View.GONE : View.VISIBLE);
       mScrollView.animate().setDuration(shortAnimTime).alpha(
         show ? 0 : 1).setListener(
         new AnimatorListenerAdapter()
         {
           @Override
           public void onAnimationEnd(Animator animation)
           {
             mScrollView.setVisibility(show ? View.GONE : View.VISIBLE);
           }
         });
 
       mProgressView.setVisibility(show ? View.VISIBLE : View.GONE);
       mProgressView.animate().setDuration(shortAnimTime).alpha(
         show ? 1 : 0).setListener(
         new AnimatorListenerAdapter()
         {
           @Override
           public void onAnimationEnd(Animator animation)
           {
             mProgressView.setVisibility(show ? View.VISIBLE : View.GONE);
           }
         });
     }
     else
     {
       // The ViewPropertyAnimator APIs are not available, so simply show
       // and hide the relevant UI components.
       mProgressView.setVisibility(show ? View.VISIBLE : View.GONE);
       mScrollView.setVisibility(show ? View.GONE : View.VISIBLE);
     }
   }
 
 
   public enum UserTasks
   {
     LOGIN, REGISTER
   }
 
   /**
    * Represents an asynchronous login/registration task used to authenticate
    * the user.
    */
   public class UserLoginTask extends AsyncTask<String, Void, Boolean>
   {
     private final String mNick;
     private final String mPassword;
     private final UserTasks mTaskType;
     private int mIdResponseCode;
 
     UserLoginTask(String nick, String password, UserTasks taskType)
     {
       mNick = nick;
       mPassword = password;
       mTaskType = taskType;
     }
 
     @Override
     protected Boolean doInBackground(String... params)
     {
       // This is a simplified version that doesn't require further libraries and an
       // Internet connection.
       mIdResponseCode = 0;
       switch (mTaskType)
       {
         case LOGIN:
         {
           mIdResponseCode = 1;
           return true;
         }
         case REGISTER:
         {
           mIdResponseCode = 2;
           return true;
         }
         default:
           mIdResponseCode = -1;
           return false;
       }
     }
 
     @Override
     protected void onPostExecute(final Boolean success)
     {
       mAuthTask = null;
       showProgress(false);
 
       if (success) finish();
       else
       {
         if (mIdResponseCode <= 0)
         {
             mPasswordView.setError(
               getString(R.string.activity_login_error_unauthorized));
             mPasswordView.requestFocus();
             SharedPreferences.Editor editor = getApplicationContext().getSharedPreferences
               (LoginActivity.SHARED_PREFERENCES, MODE_PRIVATE).edit();
             editor.remove(LoginActivity.USER_NICKNAME);
             editor.remove(LoginActivity.USER_PASSWORD);
             editor.apply();
         }
       }
     }
 
     @Override
     protected void onCancelled()
     {
       mAuthTask = null;
       showProgress(false);
     }
 }