Refactor LoginActivity code for better readability

[madhurgupta10]

Summary:
Refactor LoginActivity code for better readability, for example, this can be replaced with a switch statement.

private void handleOtherResults(String result) {
        if (result.equals("NetworkFailure")) {
            // Matches NetworkFailure which is created by the doInBackground method
            showMessageAndCancelDialog(R.string.login_failed_network);
        } else if (result.toLowerCase(Locale.getDefault()).contains("nosuchuser".toLowerCase()) || 
            result.toLowerCase().contains("noname".toLowerCase())) {
            // Matches nosuchuser, nosuchusershort, noname
            showMessageAndCancelDialog(R.string.login_failed_wrong_credentials);
            emptySensitiveEditFields();
        } else if (result.toLowerCase(Locale.getDefault()).contains("wrongpassword".toLowerCase())) {
            // Matches wrongpassword, wrongpasswordempty
            showMessageAndCancelDialog(R.string.login_failed_wrong_credentials);
            emptySensitiveEditFields();
        } else if (result.toLowerCase(Locale.getDefault()).contains("throttle".toLowerCase())) {
            // Matches unknown throttle error codes
            showMessageAndCancelDialog(R.string.login_failed_throttled);
        } else if (result.toLowerCase(Locale.getDefault()).contains("userblocked".toLowerCase())) {
            // Matches login-userblocked
            showMessageAndCancelDialog(R.string.login_failed_blocked);
        } else if (result.equals("2FA")) {
            askUserForTwoFactorAuth();
        } else {
            // Occurs with unhandled login failure codes
            Timber.d("Login failed with reason: %s", result);
            showMessageAndCancelDialog(R.string.login_failed_generic);
        }
    }

also there are many elements which still uses setOnClickListener instead of @OnClick these are small changes but it will surely make the code more maintainable and readable :)

Commons app version:
latest betaDebug

Would you like to work on the issue?
Yes