[英]Android ItemTouchHelper onChildDraw make itemView return to its original position
我重写SimpleItemTouchHelper
类中的方法onChildDraw
方式如下:
@Override
public void onChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {
if (actionState == ItemTouchHelper.ACTION_STATE_SWIPE) {
float width = (float) viewHolder.itemView.getWidth();
float alpha = 1.0f - Math.abs(dX) / width;
viewHolder.itemView.setAlpha(alpha);
viewHolder.itemView.setTranslationX(dX);
} else {
super.onChildDraw(c, recyclerView, viewHolder, dX, dY,
actionState, isCurrentlyActive);
}
}
这只是在您向左或向右滑动时启用淡入动画。
在我的适配器中,我已经实现了ItemTouchHelperAdapter
并通过以下方式覆盖onItemDismiss
以显示AlertDialog
以确认您是否要删除所选元素:
public class TeambuilderAdapter extends RecyclerView.Adapter<TeambuilderAdapter.ViewHolder> implements ItemTouchHelperAdapter {
@Override
public void onItemDismiss(int position) {
DialogInterface.OnClickListener dialogClickListener =(dialog, which) -> {
if (which == DialogInterface.BUTTON_POSITIVE) {
mData.remove(position);
notifyItemRemoved(position);
((PokemonTeambuilderTabActivity) mContext).refreshTeamList();
}
};
new AlertDialog . Builder (mContext)
.setTitle(mContext.getString(R.string.remove_team))
.setMessage(mContext.getString(R.string.remove_team_question))
.setPositiveButtonIcon(ContextCompat.getDrawable(mContext, R.drawable.ic_baseline_check_circle_14))
.setPositiveButton(mContext.getString(R.string.confirm), dialogClickListener)
.setNegativeButtonIcon(ContextCompat.getDrawable(mContext, R.drawable.ic_baseline_cancel_14))
.setNegativeButton(mContext.getString(R.string.decline), dialogClickListener)
.show();
}
...
}
一切正常,问题在于如果我按下取消按钮,刷过的项目就会消失,只有在我重新进入活动时才会再次出现。
当我按下取消或离开对话框时,如何恢复原始位置?
您的 dialogClickListener 没有处理取消按钮操作。
对于取消操作,获取您的 itemView 和setTranslationX(0)
和setAlpha(1)
。
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