Java 如何根据类别使用节标题实现 RecyclerView？

Question

提问by

I want to implement sections in my list. I have a list of tasks. List has a custom adapter which extends recyclerview swipe adapter as I have implemented swipe gesture to the recyclerview.

我想在我的列表中实现部分。我有一份任务清单。List 有一个自定义适配器，它扩展了 recyclerview 滑动适配器，因为我已经实现了对 recyclerview 的滑动手势。

So now tasks list is shown together with completed and pending tasks. Each list item has a check box which shows task is completed or pending.

所以现在任务列表与已完成和待处理的任务一起显示。每个列表项都有一个复选框，显示任务已完成或挂起。

If check box is checked then task is completed and vise versa. Now I want to make two sections in this with header. One For completed tasks and another for pending tasks.

如果复选框被选中，则任务完成，反之亦然。现在我想用标题在其中制作两个部分。一个用于已完成的任务，另一个用于挂起的任务。

So completed tasks should be shown inside completed section and vise versa. Also if the task is unchecked i.e pending and if user checks the check box then the item should get removed from the pending section and should get added to the completed section and vise versa.

因此，已完成的任务应显示在已完成部分，反之亦然。此外，如果任务未选中，即挂起，并且如果用户选中复选框，则该项目应从挂起部分中删除，并应添加到已完成部分，反之亦然。

I checked with one library for sections.

我检查了一个图书馆的部分。

https://github.com/afollestad/sectioned-recyclerview

But when I tried to implement the library I got the error that adapter can not extend two classes as I have extended recyclerview swipe library before.

但是当我尝试实现该库时，我收到了适配器无法扩展两个类的错误，因为我之前已经扩展了 recyclerview 滑动库。

Adapter :

适配器：

    public class IAdapter extends RecyclerSwipeAdapter<IAdapter.ItemViewHolder> {

    public ArrayList<Task> items;
    Context conext;
    public int _mId;

    List<Task> itemsPendingRemoval = new ArrayList<>();

    public IAdapter(Context context, ArrayList<Task> item) {
        this.conext=context;
       this.items=item;
    }


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

    }

    public static class ItemViewHolder extends RecyclerView.ViewHolder {
        Task task;
        CheckBox cb;
        SwipeLayout swipeLayout;
        TaskTableHelper taskTableHelper;
        ItemViewHolder(final View itemView) {
            super(itemView);

            taskTableHelper= new TaskTableHelper(itemView.getContext());
            swipeLayout = (SwipeLayout) itemView.findViewById(R.id.swipe);
            cb = (CheckBox) itemView.findViewById(R.id.checkbox);

        }
    }

    @Override
    public void onBindViewHolder(final ItemViewHolder itemViewHolder,final int i) {

        itemViewHolder.cb.setText(items.get(i).getTitle());

        itemViewHolder.task = items.get(i);

        int taskId = itemViewHolder.task.getId();

        itemViewHolder.task = itemViewHolder.taskTableHelper.getTask(taskId);

        int status = itemViewHolder.task.getStatus();

        if(status == 0)
        {
            itemViewHolder.cb.setTextColor(Color.WHITE);
        }

        else {

            itemViewHolder.cb.setChecked(true);

            itemViewHolder.cb.setTextColor(Color.parseColor("#B0BEC5"));

        }


       itemViewHolder.cb.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {

                if (isChecked) {

                    itemViewHolder.cb.setTextColor(Color.parseColor("#B0BEC5"));

                    itemViewHolder.task.setStatus(1);

                    itemViewHolder.taskTableHelper.updateStatus(itemViewHolder.task);

                }
                else

                {

                    itemViewHolder.cb.setTextColor(Color.WHITE);

                    itemViewHolder.task.setStatus(0);

                    itemViewHolder.taskTableHelper.updateStatus(itemViewHolder.task);

                }

            }

        });



        final Task item = items.get(i);
        itemViewHolder.swipeLayout.addDrag(SwipeLayout.DragEdge.Right,itemViewHolder.swipeLayout.findViewById(R.id.bottom_wrapper_2));
        itemViewHolder.swipeLayout.setShowMode(SwipeLayout.ShowMode.LayDown);

        itemViewHolder.swipeLayout.setOnDoubleClickListener(new SwipeLayout.DoubleClickListener() {
            @Override
            public void onDoubleClick(SwipeLayout layout, boolean surface) {
                Toast.makeText(conext, "DoubleClick", Toast.LENGTH_SHORT).show();
            }
        });
        itemViewHolder.swipeLayout.findViewById(R.id.trash2).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                mItemManger.removeShownLayouts(itemViewHolder.swipeLayout);
                items.remove(i);
                notifyItemRemoved(i);
                notifyItemRangeChanged(i, items.size());
                mItemManger.closeAllItems();

                itemViewHolder.taskTableHelper.deleteTask(item);

                _mId = item.getAlertId();

                cancelNotification();

                Toast.makeText(view.getContext(), "Deleted " + itemViewHolder.cb.getText().toString() + "!", Toast.LENGTH_SHORT).show();
            }
        });

        itemViewHolder.swipeLayout.findViewById(R.id.done).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                itemViewHolder.task.setStatus(1);
                itemViewHolder.taskTableHelper.updateStatus(itemViewHolder.task);
                itemViewHolder.cb.setChecked(true);
                Toast.makeText(conext, "Task Completed.", Toast.LENGTH_SHORT).show();
            }
        });

        itemViewHolder.swipeLayout.getSurfaceView().setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                boolean mEditMode;

                int id = item.getId();
                int priority = item.getTaskPriority();
                String title = item.getTitle();
                String alertDate = item.getAlertDate();
                String alertTime = item.getAlertTime();
                String dueDate = item.getDueDate();
                String dueTime = item.getDueTime();
                _mId = item.getAlertId();

                int listId = item.getList();

                mEditMode = true;

                Intent i = new Intent(conext, AddTaskActivity.class);

                i.putExtra("taskId", id);
                i.putExtra("taskTitle", title);
                i.putExtra("taskPriority", priority);
                i.putExtra("taskAlertTime", alertTime);
                i.putExtra("taskAlertDate", alertDate);
                i.putExtra("taskDueDate", dueDate);
                i.putExtra("taskDueTime", dueTime);
                i.putExtra("taskListId", listId);
                i.putExtra("EditMode", mEditMode);
                i.putExtra("AlertId",_mId);

                conext.startActivity(i);

            }
        });


        mItemManger.bindView(itemViewHolder.itemView, i);

    }

    @Override
    public ItemViewHolder onCreateViewHolder(ViewGroup viewGroup,int position) {

            View itemView = LayoutInflater.
                    from(viewGroup.getContext()).
                    inflate(R.layout.card_layout, viewGroup, false);
            return new ItemViewHolder(itemView);

    }



        @Override
    public void onAttachedToRecyclerView(RecyclerView recyclerView) {
        super.onAttachedToRecyclerView(recyclerView);
    }


    public void remove(int position) {
       Task item = items.get(position);
        if (itemsPendingRemoval.contains(item)) {
            itemsPendingRemoval.remove(item);
        }
        if (items.contains(item)) {
            items.remove(position);
            notifyItemRemoved(position);
        }
    }

    public void cancelNotification()
    {
        AlarmManager alarmManager = (AlarmManager)conext.getSystemService(Context.ALARM_SERVICE);
        Intent intent = new Intent(conext, NotificationReceiver.class);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(conext,_mId, intent, 0);
        alarmManager.cancel(pendingIntent);
    }
    @Override
    public int getSwipeLayoutResourceId(int position) {
        return R.id.swipe;
    }
}

EDIT:

编辑：

onBindViewHolder method after extending sectionedRecyclerview adapter:

扩展 sectionedRecyclerview 适配器后的 onBindViewHolder 方法：

 @Override
public void onBindViewHolder(ItemViewHolder itemViewHolder, int section, int i, int absolutePosition) {

    itemViewHolder.cb.setText(items.get(i).getTitle());

    itemViewHolder.task = items.get(i);

    int taskId = itemViewHolder.task.getId();

    itemViewHolder.task = itemViewHolder.taskTableHelper.getTask(taskId);

    int status = itemViewHolder.task.getStatus();

    if(status == 0)
    {
        itemViewHolder.cb.setTextColor(Color.WHITE);
    }

    else {

        itemViewHolder.cb.setChecked(true);

        itemViewHolder.cb.setTextColor(Color.parseColor("#B0BEC5"));

    }


   itemViewHolder.cb.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {

            if (isChecked) {

                itemViewHolder.cb.setTextColor(Color.parseColor("#B0BEC5"));

                itemViewHolder.task.setStatus(1);

                itemViewHolder.taskTableHelper.updateStatus(itemViewHolder.task);

            }
            else

            {

                itemViewHolder.cb.setTextColor(Color.WHITE);

                itemViewHolder.task.setStatus(0);

                itemViewHolder.taskTableHelper.updateStatus(itemViewHolder.task);

            }

        }

    });



    final Task item = items.get(i);
    itemViewHolder.swipeLayout.addDrag(SwipeLayout.DragEdge.Right,itemViewHolder.swipeLayout.findViewById(R.id.bottom_wrapper_2));
    itemViewHolder.swipeLayout.setShowMode(SwipeLayout.ShowMode.LayDown);

    itemViewHolder.swipeLayout.setOnDoubleClickListener(new SwipeLayout.DoubleClickListener() {
        @Override
        public void onDoubleClick(SwipeLayout layout, boolean surface) {
            Toast.makeText(conext, "DoubleClick", Toast.LENGTH_SHORT).show();
        }
    });
    itemViewHolder.swipeLayout.findViewById(R.id.trash2).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            mItemManger.removeShownLayouts(itemViewHolder.swipeLayout);
            items.remove(i);
            notifyItemRemoved(i);
            notifyItemRangeChanged(i, items.size());
            mItemManger.closeAllItems();

            itemViewHolder.taskTableHelper.deleteTask(item);

            _mId = item.getAlertId();

            cancelNotification();

            Toast.makeText(view.getContext(), "Deleted " + itemViewHolder.cb.getText().toString() + "!", Toast.LENGTH_SHORT).show();
        }
    });

    itemViewHolder.swipeLayout.findViewById(R.id.done).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            itemViewHolder.task.setStatus(1);
            itemViewHolder.taskTableHelper.updateStatus(itemViewHolder.task);
            itemViewHolder.cb.setChecked(true);
            Toast.makeText(conext, "Task Completed.", Toast.LENGTH_SHORT).show();
        }
    });

    itemViewHolder.swipeLayout.getSurfaceView().setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            boolean mEditMode;

            int id = item.getId();
            int priority = item.getTaskPriority();
            String title = item.getTitle();
            String alertDate = item.getAlertDate();
            String alertTime = item.getAlertTime();
            String dueDate = item.getDueDate();
            String dueTime = item.getDueTime();
            _mId = item.getAlertId();

            int listId = item.getList();

            mEditMode = true;

            Intent i = new Intent(conext, AddTaskActivity.class);

            i.putExtra("taskId", id);
            i.putExtra("taskTitle", title);
            i.putExtra("taskPriority", priority);
            i.putExtra("taskAlertTime", alertTime);
            i.putExtra("taskAlertDate", alertDate);
            i.putExtra("taskDueDate", dueDate);
            i.putExtra("taskDueTime", dueTime);
            i.putExtra("taskListId", listId);
            i.putExtra("EditMode", mEditMode);
            i.putExtra("AlertId",_mId);

            conext.startActivity(i);

        }
    });


    mItemManger.bindView(itemViewHolder.itemView, i);

}

How can I do this? Can anyone help with this please?

我怎样才能做到这一点？任何人都可以帮忙吗？

Thank you..

谢谢..

Answer 1

回答by vabhi vab

You can do it youself by hard codding.There ar smart ways to do this. follow these links. and choose one for you.

您可以通过硬编码自己完成。有一些聪明的方法可以做到这一点。按照这些链接。并为您选择一个。

https://github.com/afollestad/sectioned-recyclerview https://github.com/truizlop/SectionedRecyclerView http://android-pratap.blogspot.in/2015/12/sectioned-recyclerview-in-android_1.html

You can search more by "sectioned recyclerViews android libraries"

您可以通过“sectioned recyclerViews android libraries”进行更多搜索

Answer 2

回答by Gustavo

You can implement it with the library SectionedRecyclerViewAdapteras I explained in this post.

您可以使用库SectionedRecyclerViewAdapter来实现它，正如我在这篇文章中所解释的那样。

In order to implement the SwipeLayout, don't extend RecyclerSwipeAdapter, extend SectionedRecyclerViewAdapter and implement the SwipeLayout in ItemViewHolder / onBindItemViewHolder as you have done.

为了实现 SwipeLayout，不要像你所做的那样扩展 RecyclerSwipeAdapter，扩展 SectionedRecyclerViewAdapter 并在 ItemViewHolder / onBindItemViewHolder 中实现 SwipeLayout。

Answer 3

回答by denwehrle

The most simple way to split your recycler view into sections is by using a layout with the header and the item already in place and then changing the visibility if the header is the same.

将回收站视图拆分为多个部分的最简单方法是使用带有标题和项目的布局，然后在标题相同时更改可见性。

Layout:

布局：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <TextView
        android:id="@+id/tvHeader"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="start"
        android:padding="16dp"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:textColor="@color/primary"
        android:textStyle="bold"
        tools:text="A" />

    <TextView
        android:id="@+id/tvName"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/tvHeader"
        android:background="?android:attr/selectableItemBackground"
        android:padding="16dp"
        android:textAppearance="?android:attr/textAppearanceMedium"
        tools:text="Adam" />

</RelativeLayout>

Adapter (2018 Kotlin Edition):

适配器（2018 Kotlin 版）：

class ContactAdapter @Inject constructor() : RecyclerView.Adapter<ContactAdapter.ViewHolder>() {

    var onItemClick: ((Contact) -> Unit)? = null
    var contacts = emptyList<Contact>()

    override fun getItemCount(): Int {
        return contacts.size
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
        return ViewHolder(LayoutInflater.from(parent.context).inflate(R.layout.item_contact, parent, false))
    }

    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
        val name = contacts[position].name
        holder.header.text = name.substring(0, 1)
        holder.name.text = name

        // if not first item, check if item above has the same header
        if (position > 0 && contacts[position - 1].name.substring(0, 1) == name.substring(0, 1)) {
            holder.headerTextView.visibility = View.GONE
        } else {
            holder.headerTextView.visibility = View.VISIBLE
        }
    }

    inner class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
        val headerTextView: TextView = itemView.tvHeader
        val nameTextView: TextView = itemView.tvName

        init {
            itemView.setOnClickListener {
                onItemClick?.invoke(contacts[adapterPosition])
            }
        }
    }
}

Might be helpful as well: RecyclerView itemClickListener in Kotlin

可能也有帮助：Kotlin 中的 RecyclerView itemClickListener

Old Java Adapter Version:

旧 Java 适配器版本：

public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.DataViewHolder> {

    private List<Contact> mData;

    @Inject
    public RecyclerAdapter() {
        mData = new ArrayList<>();
    }

    public void setData(List<Contact> data) {
        mData = data;
    }

    public Contact getItem(int position){
        return mData.get(position);
    }

    @Override
    public DataViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_contact, parent, false);
        return new DataViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(final DataViewHolder holder, int position) {
        Contact contact = mData.get(position);
        holder.headerTextView.setText(contact.getName().substring(0, 1));
        holder.nameTextView.setText(contact.getName());

        // if not first item check if item above has the same header
        if (position > 0 && mData.get(position - 1).getName().substring(0, 1).equals(contact.getName().substring(0, 1))) {
            holder.headerTextView.setVisibility(View.GONE);
        } else {
            holder.headerTextView.setVisibility(View.VISIBLE);
        }
    }

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

    public class DataViewHolder extends RecyclerView.ViewHolder {

        @BindView(R.id.text_header)
        TextView headerTextView;
        @BindView(R.id.text_name)
        TextView nameTextView;

        public DataViewHolder(View itemView) {
            super(itemView);
            ButterKnife.bind(this, itemView);
        }
    }
}

Answer 4

回答by Maxime Jallu

Take a look at my library on Github, can be used to easily create sections: RecyclerAdapter & Easy Section

看看我在 Github 上的库，可以用来轻松创建部分： RecyclerAdapter & Easy Section

mRecylerView.setLayoutManager(...);
/*create Adapter*/
RecyclerAdapter<Customer> baseAdapter = new RecyclerAdapter<>(...);
/*create sectioned adapter. the Adapter type can be RecyclerView.Adapter*/
SectionedAdapter<String, RecyclerAdapter> adapter = new SectionedAdapter<>(SectionViewHolder.class, baseAdapter);
/*add your sections*/
sectionAdapter.addSection(0/*position*/, "Title Section 1");
/*attach Adapter to RecyclerView*/
mRecylerView.setAdapter(sectionAdapter);

Hope it helps.

希望能帮助到你。

Java 如何根据类别使用节标题实现 RecyclerView？

提问by

回答by vabhi vab

回答by Gustavo

回答by denwehrle

回答by Maxime Jallu

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Java 如何根据类别使用节标题实现 RecyclerView？

提问by

回答by vabhi vab

回答by Gustavo

回答by denwehrle

回答by Maxime Jallu

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