Question

为了不重复代码我在我的程序中决定创建一个BaseFragment（扩展Fragment）以保留一些样板数据并提供正确的暂停/恢复处理，以及newInstance(String myPram)方法。简而言之：BaseFragment的作用是确保保存和恢复状态，即将myPramas恢复为局部变量......

我接下来要做的是扩展BaseFragment以便为两个不同的片段处理两种不同类型的布局（每个需要处理MyParam归档）：EditFragment和DetailFragment。问题现在出现了，因为没有View为Fragment膨胀，尽管它们被添加为一个事务（因此它们是透明的！）。 EditFragment和DetailFragment都提供onCreateView()方法，为了构建自己的视图，我是正确的，因为我设法创建它们而没有“子类化机制”，当然BaseFragment没有提供onCreateView()的实现，但没有结果，它们没有绘制UI。

我尝试在这里和那里放置一些super.onCreateView（），但没有结果......我做错了什么？这是基础片段：

public class TimetableBaseFragment extends Fragment {

public static String ID_FIELD = "id";
public static String ID_DESC = "desc";
private String id;
private String desc;

// Constructor to deliver previous position along with itself
public static Fragment newInstance(String id, String desc) {
    TimetableBaseFragment f = new TimetableBaseFragment();
    Bundle args = new Bundle();
    args.putString(ID_FIELD, id);
    args.putString(ID_DESC, desc);
    f.setArguments(args);
    return f;
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    Bundle args = getArguments();
    if (args != null) {
        id = args.getString(ID_FIELD);
        desc = args.getString(ID_DESC);
    }

    if (savedInstanceState != null) {
        id = savedInstanceState.getString(ID_FIELD);
        desc = savedInstanceState.getString(ID_DESC);
    }
}

@Override
public void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    outState.putString(ID_FIELD, id);
    outState.putString(ID_DESC, desc);
}

@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);

    if (savedInstanceState != null) {
        id = savedInstanceState.getString(ID_FIELD);
        desc = savedInstanceState.getString(ID_DESC);
    }
}

public String getExamId() {
    return id;
}

public String getExamDesc() {
    return desc;
}
}

我想补充的是：

public class TimetableEditFragment extends TimetableBaseFragment {

private LinearLayout mLlEditEmpty;

private ArrayList<ScheduleUser> lessons;
private TimetableEditRecyclerViewAdapter mAdapter;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    lessons = new ArrayList<>();
    mAdapter = new TimetableEditRecyclerViewAdapter(getActivity());
}

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    ViewGroup rootView = (ViewGroup) inflater.inflate(R.layout.fragment_timetable_edit, container, false);

    mLlEditEmpty = (LinearLayout) rootView.findViewById(R.id.LOGIC_empty);
    RecyclerView mRvEdit = (RecyclerView) rootView.findViewById(R.id.HEADER_rv);
    mRvEdit.setHasFixedSize(true);
    mRvEdit.setLayoutManager(new LinearLayoutManager(getActivity()));
    mRvEdit.addItemDecoration(new DividerItemDecoration(getActivity(), DividerItemDecoration.VERTICAL_LIST));
    mRvEdit.setAdapter(mAdapter);

    Toolbar examDesc = (Toolbar) rootView.findViewById(R.id.HEADER_examDesc);
    examDesc.setTitle("TOOLBAR Testing");


    FloatingActionButton add_fab = (FloatingActionButton) rootView.findViewById(R.id.EDIT_fab);
    add_fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            addLesson(new ScheduleUser());
        }
    });

    return rootView;
}

public void addLesson(ScheduleUser newItem) {
    lessons.add(newItem);
    mAdapter.notifyItemInserted(lessons.size() - 1);
}

public class TimetableEditRecyclerViewAdapter extends RecyclerView.Adapter<TimetableEditRecyclerViewAdapter.ViewHolder> {
    /* Lots of stuff */
}
}

PS：我注意到，很可能孩子onCreateView（）根本没有被调用，因为我有一个错误，这是由于在运行时提供资金，但是系统没有通知。

请帮忙！

子类片段onCreateView

0 个答案: