Android：优化片段转换

Question

所以在我的应用程序中，我有一堆片段供用户浏览。我的活动类中有很多用于片段转换的方法。它们彼此非常相似，唯一的区别是 newFragment 的类。这是其中一种方法：

public void onHelpSelected() {

    slideInRight();

    final Handler handler = new Handler();
    handler.postDelayed(new Runnable() {
        @Override
        public void run() {

            HelpFragment newFragment = new HelpFragment();
            FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
            transaction.replace(R.id.fragment_container, newFragment);
            transaction.addToBackStack(null);
            transaction.commit();

            slideOutLeft();
        }

    }, 500);

}

然后，我还有一些描述每个片段的类。它们彼此也非常相似：它们的区别仅在于按钮的数量和这些按钮的作用（但大多数按钮用于片段转换）。以下是这些类之一：

    public class AuthFragment extends Fragment {

    Button authRegButton;
    Button authHelpButton;

    OnHelpButtonListener helpCallback;
    OnRegButtonListener regCallback;

    @Override
    public View onCreateView (LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        View view = inflater.inflate(R.layout.fragment_auth, container, false);


        authHelpButton = (Button) view.findViewById(R.id.auth_help_button);
        View.OnClickListener authHelpListener = new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                helpCallback.onHelpSelected();
            }
        };
        authHelpButton.setOnClickListener(authHelpListener);


        authRegButton = (Button) view.findViewById(R.id.auth_reg_button);
        View.OnClickListener authRegListener = new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                regCallback.onRegSelected();
            }
        };
        authRegButton.setOnClickListener(authRegListener);

        return view;
    }

    public interface OnHelpButtonListener {
        void onHelpSelected();
    }

    public interface OnRegButtonListener {
        void onRegSelected();
    }

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);

        try {
            helpCallback = (OnHelpButtonListener) context;
        } catch (ClassCastException e) {
            throw new ClassCastException(context.toString()
                    + " must implement OnHelpButtonListener");
        }

        try {
            regCallback = (OnRegButtonListener) context;
        } catch (ClassCastException e) {
            throw new ClassCastException(context.toString()
                    + " must implement OnRegButtonListener");
        }
    }

}

所以，我有很多非常相似的代码。我敢打赌，有一种方法可以让所有这些代码看起来更漂亮，工作效率更高。

因此，我的问题是我该怎么做？ :)

谢谢！

Answer 1

如果有人需要，这就是我解决这个问题的方法:)

所以我为我的片段创建了一个抽象类，并在那里编写了所有代码：

public abstract class LoginFragment extends Fragment {

MediaPlayer clickPlayer;
int layoutId;
View view;
OnButtonListener buttonCallback;

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

    view = inflater.inflate(layoutId, container, false);

    return view;

}

public interface OnButtonListener {
    void onButtonSelected(LoginFragment fragment);
}

@Override
public void onAttach(Context context) {
    super.onAttach(context);

    try {
        buttonCallback = (OnButtonListener) context;
    } catch (ClassCastException e) {
        throw new ClassCastException(context.toString()
                + " must implement OnButtonListener");
    }

}

public MyButton setUpButton(int buttonId) {

    final MyButton button = (MyButton) view.findViewById(buttonId);
    View.OnClickListener authHelpListener = new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            clickPlayer = MediaPlayer.create(getContext(), R.raw.click);
            clickPlayer.start();
            LoginFragment newFragment = determineFragment(button);
            buttonCallback.onButtonSelected(newFragment);
        }
    };
    button.setOnClickListener(authHelpListener);

    return button;

}

public LoginFragment determineFragment(MyButton button) {

    LoginFragment result;
    int buttonId = button.getId();

    switch (buttonId){

        case R.id.auth_help_button:
            result = new HelpFragment();
            break;
        case R.id.agr_cancel_button:case R.id.help_cancel_button:
        case R.id.reg_cancel_button:case R.id.reg_cont_cancel_button:
            result = new AuthFragment();
            break;
        case R.id.agr_back_button:case R.id.reg_cont_button:
            result = new RegContFragment();
            break;
        case R.id.reg_cont_agr_button:
            result = new AgrFragment();
            break;
        case R.id.auth_reg_button:
            result = new RegFragment();
            break;
        default:
            result = null;
            break;
    }

    return result;

}