对RecyclerView滑动以关闭

Question

我曾经使用SwipeToDismiss库,但现在我正在尝试迁移到RecyclerView,事情并不那么明显,你知道这个lib的替代品吗？任何想法如何从头开始实现它？

Answer 1

从v22.2.0开始,Android支持团队已经包含了一个ItemTouchHelper使刷卡到解除和拖放非常简单的类.这可能不像某些库那样功能齐全,但它直接来自Android团队.

• 更新build.gradle以导入RecyclerView库的v22.2.+

  compile 'com.android.support:recyclerview-v7:22.2.+'
  

• 使用适当的SimpleCallback实例化ItemTouchHelper

  ItemTouchHelper.SimpleCallback simpleItemTouchCallback = new ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT) {
      [...]
      @Override
      public void onSwiped(RecyclerView.ViewHolder viewHolder, int swipeDir) {
          //Remove swiped item from list and notify the RecyclerView
      }
  };
  
  ItemTouchHelper itemTouchHelper = new ItemTouchHelper(simpleItemTouchCallback);
  

  **请注意,SimpleCallback会引导您要启用拖放的方向以及要启用滑动的路线.

• 附加到您的RecyclerView

  itemTouchHelper.attachToRecyclerView(recyclerView);
  

Answer 2

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

        @Override
        public void onSwiped(final RecyclerView.ViewHolder viewHolder, int direction) {
            final int position = viewHolder.getAdapterPosition(); //get position which is swipe

            if (direction == ItemTouchHelper.LEFT) {    //if swipe left

                AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this); //alert for confirm to delete
                builder.setMessage("Are you sure to delete?");    //set message

                builder.setPositiveButton("REMOVE", new DialogInterface.OnClickListener() { //when click on DELETE
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        adapter.notifyItemRemoved(position);    //item removed from recylcerview
                        sqldatabase.execSQL("delete from " + TABLE_NAME + " where _id='" + (position + 1) + "'"); //query for delete
                        list.remove(position);  //then remove item

                        return;
                    }
                }).setNegativeButton("CANCEL", new DialogInterface.OnClickListener() {  //not removing items if cancel is done
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        adapter.notifyItemRemoved(position + 1);    //notifies the RecyclerView Adapter that data in adapter has been removed at a particular position.
                        adapter.notifyItemRangeChanged(position, adapter.getItemCount());   //notifies the RecyclerView Adapter that positions of element in adapter has been changed from position(removed element index to end of list), please update it.
                        return;
                    }
                }).show();  //show alert dialog
            }
        }
    };
    ItemTouchHelper itemTouchHelper = new ItemTouchHelper(simpleCallback);
    itemTouchHelper.attachToRecyclerView(recyclerView); //set swipe to recylcerview

在代码中如果用户向左滑动则显示AlertDialog,如果用户选择REMOVE,则会从数据库中删除item并刷新recyclelerview,如果用户选择CANCEL,则recyclelerview就是这样.

Answer 3

也许你可以尝试这个库:

https://github.com/daimajia/AndroidSwipeLayout

更新:我刚刚发现了另一个可以与RecyclerView一起使用的好库:

https://github.com/hudomju/android-swipe-to-dismiss-undo