抽象类与多态性问题

Question

我正努力做到以下几点：

public abstract class MyBaseFragment extends Fragment {
    private FloatingActionButton fab;

    protected void initFab(View contentView, int resourceId) {
        fab = (FloatingActionButton) contentView.findViewById(resourceId);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                launchDetailsDialogFragment(new Animal());
            }
        });
    }

    private void launchDetailsDialogFragment(Animal animal) {
        //... 
    }
}

这里的关键点是关于制造新动物的台词。

Answer 1

只需使被调用的方法抽象，并让每个具体类填充到自己的实现中即可

public abstract class MyBaseFragment extends Fragment {
    private FloatingActionButton fab;

    protected void initFab(View contentView, int resourceId) {
        fab = (FloatingActionButton) contentView.findViewById(resourceId);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                launchDetailsDialogFragment();
            }
        });
    }

    protected abstract void launchDetailsDialogFragment();
}