android - 如何重用 RecyclerView 对象、适配器和 View 持有者

Question

我的应用程序中有一系列以前称为 listView 的东西，现在是 RecyclerView。我很好奇提高模块化和减少我应用程序这一部分重复的最有效方法。

例如，我有 GroupMemberFragment 和 FriendFragment，它们具有几乎相同的 RecyclerView.ViewHolders 和 RecyclerView.Adapters

最好的重构方式是什么，以减少代码重复，同时仍然允许每个相应的项目列表对其数据是唯一的，并且足够灵活以在将来添加更多数据？

GroupMemberFragment:

public class GroupMemberFragment extends Fragment {

    RecyclerView mRecyclerView;
    ArrayList<Group> mGRoups;

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

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

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

        mRecyclerView = (RecyclerView) view.findViewById(R.id.recycler_view_layout);
        mRecyclerView.setHasFixedSize(true);

        mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));

        // Only things that need to change across all the list classes....
        mGRoups = GroupListProvider.getInstance(getActivity()).getGroups();
        mRecyclerView.setAdapter(new GroupAdapter(mGRoups));

        return view;
    }


    // inner Class

    private class GroupViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
        private final TextView mName;
        private final TextView mChannel;

        public GroupViewHolder(View itemView) {
            super(itemView);

            mName = (TextView) itemView.findViewById(R.id.tv_name);
            mChannel = (TextView) itemView.findViewById(R.id.tv_number);

            mName.setOnClickListener(this);
        }

        public void bindGroup(Group group){
            mName.setText(group.getName().toString());
            mChannel.setText(group.getGroupChannelID().toString());
        }

        @Override
        public void onClick(View view) {
            int itemPosition = getAdapterPosition();
            Toast.makeText(getContext(), "Position is: " + String.valueOf(itemPosition), Toast.LENGTH_LONG).show();
        }
    }


    class GroupAdapter extends RecyclerView.Adapter<GroupViewHolder> {
        ArrayList<Group> groupList;

        GroupAdapter(ArrayList<Group> object){
            this.groupList = object;
        }

        @Override
        public GroupViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            View view = LayoutInflater.from(parent.getContext())
                    .inflate(R.layout.rv_item, parent, false);

            return new GroupViewHolder(view);

        }

        @Override
        public void onBindViewHolder(GroupViewHolder holder, int position) {

            Group group = groupList.get(position);
            holder.bindGroup(group);
        }

        @Override
        public int getItemCount() {
            return groupList.size();
        }
    }
}

FriendFragment:

public class FriendFragment extends Fragment {

    RecyclerView mRecyclerView;
    ArrayList<Friend> mContacts;

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

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

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

        mRecyclerView = (RecyclerView) view.findViewById(R.id.recycler_view_layout);
        mRecyclerView.setHasFixedSize(true);

        mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));

        mContacts = FriendProvider.getInstance(getActivity()).getFriends();
        mRecyclerView.setAdapter(new ContactAdapter(mContacts));

        return view;
    }

    // Inner Class

    private class ContactViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
        private final TextView mName;
        private final TextView mNumber;
        private Friend mContact;

        public ContactViewHolder(View itemView) {
            super(itemView);

            mName = (TextView) itemView.findViewById(R.id.tv_name);
            mNumber = (TextView) itemView.findViewById(R.id.tv_number);

            mName.setOnClickListener(this);
        }

        public void bindContact(Friend contact){
            mContact = contact;
            mName.setText(contact.getFirstName().toString() + " " + contact.getLastName());
            mNumber.setText(contact.getFriendChannelID().toString());
        }

        @Override
        public void onClick(View view) {
            int itemPosition = getAdapterPosition();
            Toast.makeText(getContext(), "Position is: " + String.valueOf(itemPosition), Toast.LENGTH_LONG).show();
        }

    }

    class ContactAdapter extends RecyclerView.Adapter<ContactViewHolder> {
        ArrayList<Friend> contactList;

        ContactAdapter(ArrayList<Friend> object){
            this.contactList = object;
        }

        @Override
        public ContactViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            View view = LayoutInflater.from(parent.getContext())
                    .inflate(R.layout.rv_item, parent, false);

            return new ContactViewHolder(view);

        }

        @Override
        public void onBindViewHolder(ContactViewHolder holder, int position) {

            Friend contact = contactList.get(position);
            holder.bindContact(contact);
        }


        @Override
        public int getItemCount() {
            return contactList.size();
        }
    }
}

Answer 1

您可以从两个类中取出适配器类并为其创建一个单独的 Java 文件，并为您拥有的两个类使用相同的适配器。为此，您可以为适配器创建两个不同的构造函数并实现它。