Android-RecyclerView:通过刷卡删除项目
我有一个RecyclerView,这些物品应该在刷卡后移除。我用ItemTouchHelper类解决了这个问题。在onchildraw方法中,我设置了一个红色背景,在列表项后面滑动时出现。最重要的是,在正确的网站上有一个垃圾图标。它工作正常,但是如果你开始刷卡,但不刷卡到底,然后又刷卡回到正常位置,垃圾桶的图标不会消失。但是,它只有在我滑动所选项目时才会消失,而不是在普通项目上 下面是ItemTouchHelper类的代码:Android-RecyclerView:通过刷卡删除项目,android,android-recyclerview,swipe,itemtouchhelper,Android,Android Recyclerview,Swipe,Itemtouchhelper,我有一个RecyclerView,这些物品应该在刷卡后移除。我用ItemTouchHelper类解决了这个问题。在onchildraw方法中,我设置了一个红色背景,在列表项后面滑动时出现。最重要的是,在正确的网站上有一个垃圾图标。它工作正常,但是如果你开始刷卡,但不刷卡到底,然后又刷卡回到正常位置,垃圾桶的图标不会消失。但是,它只有在我滑动所选项目时才会消失,而不是在普通项目上 下面是ItemTouchHelper类的代码: ItemTouchHelper.SimpleCallback simp
ItemTouchHelper.SimpleCallback simpleItemTouchCallback = new ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.LEFT) {
@Override
public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
return false;
}
@Override
public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
int position = viewHolder.getAdapterPosition();
rvAdapter.removeItem(position);
}
@Override
public void onChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive){
Bitmap icon;
if(actionState == ItemTouchHelper.ACTION_STATE_SWIPE){
View itemView = viewHolder.itemView;
float height = (float) itemView.getBottom() - (float) itemView.getTop();
float marginRight = 10;
paint.setColor(Color.parseColor("#D32F2F"));
RectF background = new RectF((float) itemView.getRight() + dX, (float) itemView.getTop(),(float) itemView.getRight(), (float) itemView.getBottom());
c.drawRect(background,paint);
icon = BitmapFactory.decodeResource(getResources(), R.drawable.ic_delete_forever);
RectF icon_dest = new RectF((float) itemView.getRight() - marginRight - height, itemView.getTop(), itemView.getRight() - marginRight, itemView.getBottom());
c.drawBitmap(icon,null,icon_dest,paint);
}
super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
}
};
有人知道如何在取消刷卡时删除图标吗?还是有类似于z指数的东西?因为当我刷回所选项目时,垃圾箱图标会消失在项目下。但是,当我滑动一个普通项目时,图标位于项目上方,然后图标保持在那里。@Override
@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) {
Bitmap icon;
Paint paint = new Paint();
View itemView = viewHolder.itemView;
float height = (float) itemView.getBottom() - (float) itemView.getTop();
float width = height / 3;
if (dX < 0) {
paint.setColor(Color.parseColor("#D32F2F"));
RectF background = new RectF(
(float) itemView.getRight() + dX, (float) itemView.getTop(),
(float) itemView.getRight(), (float) itemView.getBottom());
c.drawRect(background, paint);
icon = BitmapFactory.decodeResource(context.getResources(), R.drawable.ic_delete);
RectF iconDest = new RectF(
(float) itemView.getRight() - 2 * width, (float) itemView.getTop() + width,
(float) itemView.getRight() - width, (float) itemView.getBottom() - width);
c.drawBitmap(icon, null, iconDest, paint);
}
} else if (actionState == ItemTouchHelper.ACTION_STATE_DRAG) {
final float alpha = ALPHA_FULL - Math.abs(dY) / (float) viewHolder.itemView.getHeight();
viewHolder.itemView.setAlpha(alpha);
viewHolder.itemView.setTranslationY(dY);
}
super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
}
public void onChildraw(画布c、RecyclerView RecyclerView、RecyclerView.ViewHolder ViewHolder、float dX、float dY、int actionState、boolean isCurrentlyActive){
如果(actionState==ItemTouchHelper.ACTION\u STATE\u SWIPE){
位图图标;
油漆=新油漆();
View itemView=viewHolder.itemView;
浮动高度=(float)itemView.getBottom()-(float)itemView.getTop();
浮动宽度=高度/3;
if(dX<0){
paint.setColor(Color.parseColor(#D32F2F));
RectF background=新的RectF(
(float)itemView.getRight()+dX,(float)itemView.getTop(),
(float)itemView.getRight(),(float)itemView.getBottom();
c、 drawRect(背景、油漆);
icon=BitmapFactory.decodeResource(context.getResources(),R.drawable.ic_delete);
RectF iconDest=新的RectF(
(float)itemView.getRight()-2*宽度,(float)itemView.getTop()+宽度,
(float)itemView.getRight()-width,(float)itemView.getBottom()-width);
c、 drawBitmap(图标、null、iconDest、绘制);
}
}else if(actionState==ItemTouchHelper.ACTION\u STATE\u拖动){
最终浮点alpha=alpha_FULL-Math.abs(dY)/(float)viewHolder.itemView.getHeight();
viewHolder.itemView.setAlpha(alpha);
viewHolder.itemView.setTranslationY(dY);
}
super.onchildraw(c、recyclerView、viewHolder、dX、dY、actionState、isCurrentlyActive);
}