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如何根据类别使用节标题实现回收器视图？

header android java android-recyclerview sections
2022-09-01 20:44:09

我想在我的列表中实现部分。我有一个任务列表。List有一个自定义适配器，它扩展了recyckerview刷卡适配器，因为我已经实现了rakesing手势到recyckerview。

因此，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，其中显示任务已完成或挂起。

如果选中复选框，则任务已完成，反之亦然。现在我想用标题在这里做两个部分。一个用于已完成的任务，另一个用于挂起的任务。

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

我用一个图书馆检查了部分。

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

但是当我尝试实现库时，我得到了一个错误，适配器无法扩展两个类，因为我之前已经扩展了recyckerview滑动库。

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;
    }
}

编辑：

onBindViewHolder 方法在扩展 sectionedRecyclerview adapter 之后：

 @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);

}

我该怎么做？任何人都可以帮忙吗？

谢谢。。


答案 1

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

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>

适配器（2018 年 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])
            }
        }
    }
}

可能也会有所帮助： RecyclerView item在Kotlin中单击Listener

旧的 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);
        }
    }
}

答案 2

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

为了实现SwipeLayout，不要扩展RecyclatorSwipeAdapter，扩展SectionedRecyclerViewAdapter，并在ItemViewHolder / onBindItemViewHolder中实现SwipeLayout。


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