Legacy code

legacyActivity.java

public class LoginActivity extends Activity {

    private EditText mEmailEdit;
    private EditText mPassword;
    private Button btnSend;
    private EditText mPhoneNumber;
    private TextWatcher watcher;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
        watcher = new TextWatcher() {
            @Override
            public void beforeTextChanged(final CharSequence s, final int start, final int count, final int after) {
            }

            @Override
            public void onTextChanged(final CharSequence s, final int start, final int before, final int count) {
            }

            @Override
            public void afterTextChanged(final Editable s) {
                validateAll();
            }
        };
        mEmailEdit = (EditText) findViewById(R.id.login_email);
        mEmailEdit.addTextChangedListener(watcher);
        mPhoneNumber = (EditText) findViewById(R.id.login_phone_number);
        mEmailEdit.addTextChangedListener(watcher);
        mPassword = (EditText) findViewById(R.id.login_password);
        btnSend = (Button) findViewById(R.id.login_send);

        btnSend.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                startRequestSend();
            }
        });
    }

    // Validate all form fields
    private boolean validateAll() {
        boolean valid;
        valid = validateEmail();
        String password = mPassword.getText().toString();
        // password min length == 4
        valid &= (password != null && password.length() > 4);
        buttonState(valid);
        return valid;
    }

    // Enable or disable button
    private void buttonState(boolean enable) {
        if (enable) {
            btnSend.setEnabled(true);
        } else {
            btnSend.setEnabled(false);
        }
    }

    private boolean validateEmail() {
        String email = mEmailEdit.getText().toString();
        String phone = mPhoneNumber.getText().toString();

        boolean valid = false;
        if (!TextUtils.isEmpty(email)) {
            valid = Patterns.EMAIL_ADDRESS.matcher(email).matches();
        }
        if (!TextUtils.isEmpty(phone)) {
            valid &= Patterns.PHONE.matcher(email).matches();
        }
        return valid;
    }


    protected void startRequestSend() {
        //Start Dialog
        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                ProgressDialogFragment.newInstanceRunnable(getFragmentManager(), R.string.dialog_title_loading, null);
            }
        });

        final String email = mEmailEdit.getText().toString();
        final String phone = mPhoneNumber.getText().toString();
        final String password = mPassword.getText().toString();

        final BaseRequest<UserResponse> request;
        // Email Request or Phone Request
        if (!TextUtils.isEmpty(email)) {
            request = new EmailRequest(email, password);
        } else {
            request = new PhoneRequest(phone, password);
        }
        // Send request
        RequestManager.execute(request, request.getRequestCache(), RequestManager.EXPIRATION_TIME, new LoginRequestListener());
    }


    private class LoginRequestListener implements RequestManager.RequestListener {

        @Override
        public void onSuccess() {
            SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(LoginActivity.this);
            prefs.edit().putBoolean("login_success", true).commit();
            launchNextActivity();
        }

        @Override
        public void onError(int errorCode) {
            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    ProgressDialogFragment.newInstanceRunnable(getFragmentManager(), R.string.error, "Error on login");
                }
            });
        }
    }
}