在 onBindViewHolder RecyclerView 中添加滑动

Question

大家好，我正在尝试在 onBindViewHolder 中使用滑动，因为我的项目来自数据库，但我认为它似乎不起作用，因为我的应用程序崩溃了。我将此自定义光标适配器用于我的 recyclerview https://gist.github.com/skyfishjy/443b7448f59be978bc59 这是我的代码。

@Override
public void onBindViewHolder(ItemViewHolder viewHolder, Cursor cursor) {
        mItems = cursor;
        final int     id      = cursor.getInt(cursor.getColumnIndex(MyDBHandler.COLUMN_ID));
        final String  title   = cursor.getString(cursor.getColumnIndex(MyDBHandler.COLUMN_TITLE_REMINDER));
        final String  desc    = cursor.getString(cursor.getColumnIndex(MyDBHandler.COLUMN_DESC_REMINDER));
        final String  date    = cursor.getString(cursor.getColumnIndex(MyDBHandler.COLUMN_DATE_REMINDER));

        viewHolder.title.setText(title);

        viewHolder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(context, String.valueOf(id), Toast.LENGTH_SHORT).show();
            }
        });

        ItemTouchHelper.SimpleCallback simpleItemTouchCallback = new ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT) {
            @Override
            public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
                return false;
            }

            @Override
            public void onSwiped(RecyclerView.ViewHolder viewHolder, int swipeDir) {
                int itemPosition = viewHolder.getAdapterPosition();
                notifyItemRemoved(itemPosition);
                dbHandler.deleteReminder(id);
            }
        };

        ItemTouchHelper itemTouchHelper = new ItemTouchHelper(simpleItemTouchCallback);
        itemTouchHelper.attachToRecyclerView(this.myRecyclerview);
}

我是否可以通过滑动来关闭我在回收站视图中的物品？

Answer 1

从 onBindViewHolder 中删除以下代码块并添加到您的 activity 或初始化适配器的片段中。

 ItemTouchHelper.SimpleCallback simpleItemTouchCallback = new ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT) {
            @Override
            public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
                return false;
            }

            @Override
            public void onSwiped(RecyclerView.ViewHolder viewHolder, int swipeDir) {     // type cast your view holder
                // CusrsorViewHolder cViewHolder = (CursorViewHolder)viewHolder;
                int itemPosition = viewHolder.getAdapterPosition();
                notifyItemRemoved(itemPosition);
                dbHandler.deleteReminder(cViewHolder.id);
            }
        };

 ItemTouchHelper itemTouchHelper = new ItemTouchHelper(simpleItemTouchCallback);
 itemTouchHelper.attachToRecyclerView(this.myRecyclerview);
 //put the above code before the following method in your activity or fragment
 //this.RecylerView.setAdapter(adapter)

在onBindViewHolder中设置你的id

@Override
public void onBindViewHolder(ItemViewHolder viewHolder, Cursor cursor) {
        mItems = cursor;
        final int     id      = cursor.getInt(cursor.getColumnIndex(MyDBHandler.COLUMN_ID));
        viewHolder.id = id;
}

Answer 2

使用下面的代码从列表中删除项目。 orderlist 是 RecyclerView 变量。

SwipeDismissRecyclerViewTouchListener touchListener =
    new SwipeDismissRecyclerViewTouchListener(
            orderlist,
            new SwipeDismissRecyclerViewTouchListener.DismissCallbacks() {
                @Override
                public boolean canDismiss(int position) {
                    return true;
                }

                @Override
                public void onDismiss(RecyclerView recyclerView, int[] reverseSortedPositions) {
                    for (int position : reverseSortedPositions) {
                        /*db.deleteOrderProduct(ordereditems.get(position).getOrder_pro_Code());
                        if(position>1){
                            listposition = position-1;
                        }*/
                        //ordereditems.remove(position);
                        //adapter.notifyItemRemoved(position);
                        //adapter.notifyDataSetChanged();
                        //displayOrderList();
                        DeleteOrderById(position);

                    }
                    adapter.notifyDataSetChanged();
                }
            });
orderlist.setOnTouchListener(touchListener);

Answer 3

感谢@Waleed Sarwar 帮我解决了这个问题。

我正在为我的 recyclerviewcursoradapter 使用 https://gist.github.com/skyfishjy/443b7448f59be978bc59。

MainActivity.java

ItemTouchHelper.SimpleCallback simpleItemTouchCallback = new ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT) {
        @Override
        public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
            return false;
        }

        @Override
        public void onSwiped(RecyclerView.ViewHolder viewHolder, int swipeDir) {
            RemindersAdapter.ItemViewHolder itemViewHolder = (RemindersAdapter.ItemViewHolder)viewHolder;
            int itemPosition = itemViewHolder.getAdapterPosition();
            adapter.notifyItemRemoved(itemPosition);
            // get the id of an item via itemViewHolder.id
            dbHandler.deleteReminder(itemViewHolder.id);

            // update cursor upon deleting do avoid
            // the card from coming back upon swipe
            adapter.swapCursor(dbHandler.getAllReminders());
        }
    };

    ItemTouchHelper itemTouchHelper = new ItemTouchHelper(simpleItemTouchCallback);
    itemTouchHelper.attachToRecyclerView(listReminder);

RemindersAdapter.java

@Override
public void onBindViewHolder(ItemViewHolder viewHolder, Cursor cursor) {
    final int     id      = cursor.getInt(cursor.getColumnIndex(MyDBHandler.COLUMN_ID));
    final String  title   = cursor.getString(cursor.getColumnIndex(MyDBHandler.COLUMN_TITLE_REMINDER));
    final String  desc    = cursor.getString(cursor.getColumnIndex(MyDBHandler.COLUMN_DESC_REMINDER));
    final String  date    = cursor.getString(cursor.getColumnIndex(MyDBHandler.COLUMN_DATE_REMINDER));

    viewHolder.title.setText(title);

    // pass id to viewholder to get in swipe
    viewHolder.id = id;
}

public class ItemViewHolder extends RecyclerView.ViewHolder{
    public int id;
    TextView title;

    public ItemViewHolder(View itemView) {
            super(itemView);
            title = (TextView) itemView.findViewById(R.id.reminderTitle);
        }
}

我正在使用 adapter.swapCursor(dbHandler.getAllReminders());来自我的适配器，它是抽象 class CursorRecyclerViewAdapter 的一种方法，它使光标在删除时更新，因为没有它，删除的项目将由 onBindViewHolder 重新创建。

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