Question

//这是我的Recyclerview onScrollEvent

recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
    @Override
    public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
        super.onScrollStateChanged(recyclerView, newState);
    }

    @Override
    public void onScrolled(final RecyclerView recyclerView, int dx, int dy) {
        super.onScrolled(recyclerView, dx, dy);
        final int positionView = ((LinearLayoutManager) recyclerView.getLayoutManager()).findLastVisibleItemPosition();
        if (dy > 0) {
            if (positionView >= 3) {
                final View view = recyclerView.getChildAt(3);
                if (view != null && recyclerView.getChildAdapterPosition(view) == positionView) {
                    TranslateAnimation translateAnimation = new TranslateAnimation(0, 0, 200, 0);
                    translateAnimation.setAnimationListener(new Animation.AnimationListener() {
                        @Override
                        public void onAnimationStart(Animation animation) {
                            recyclerView.smoothScrollToPosition(positionView);
                        }

                        @Override
                        public void onAnimationEnd(Animation animation) {
                            view.clearAnimation();
                        }

                        @Override
                        public void onAnimationRepeat(Animation animation) {

                        }
                    });
                    translateAnimation.setDuration(350);
                    view.setAnimation(translateAnimation);

                }
                createStackImageView();
                for (int i = stackView.getChildCount()-1; i >=1; i--) {
                    ResizeAnimation resizeAnimation = new ResizeAnimation(stackView.getChildAt(i));
                    resizeAnimation.setHeights(stackView.getChildAt(i).getHeight(), stackView.getChildAt(i - 1).getHeight());
                    resizeAnimation.setWidths(stackView.getChildAt(i).getWidth(), stackView.getChildAt(i - 1).getWidth());
                    resizeAnimation.setDuration(250);
                    stackView.getChildAt(i).startAnimation(resizeAnimation);
                    if(i==1){
                            stackView.removeView(stackView.getChildAt(i));
                            stackView.invalidate();
                            stackView.requestLayout();
                        }
                }
                stackView.invalidate();
            }
        } else {

        }
    }
});

//这是我在relativelayout中创建一个imageview的方法

private void createStackImageView() {
    fourthStack = new ImageView(getActivity());
    RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams
        (1, 1);
    layoutParams.addRule(RelativeLayout.CENTER_HORIZONTAL);
    layoutParams.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
    fourthStack.setLayoutParams(layoutParams);
    fourthStack.setScaleType(ImageView.ScaleType.CENTER_CROP);
    Random rnd = new Random();
    int color = Color.argb(255, rnd.nextInt(256), rnd.nextInt(256), rnd.nextInt(256));
    fourthStack.setBackgroundColor(color);
    fourthStack.requestLayout();
    stackView.addView(fourthStack, layoutParams);
}

现在我的主要问题是当RecyclerView滚动时我在底部创建图像以便动态堆栈数量。当在底部创建此ImageView时，应该删除RelativeLayout中的最顶层图像，这样就没有内存但是，对我而言，它正在删除我创建的整个堆栈。我无法弄清楚为什么会这样。

Answer 1

当您从顶部移除ImageView时它可能与底部元素有相对连接。因此，当您从顶部删除图像时，与已删除视图的相对连接的视图将不可见。如果您使用GONE方法删除顶视图尝试使用Invisible并检查是否发生了同样的事情

当在堆栈底部添加ImageView时，我想删除RelativeLayout中的顶级ImageView，但它正在删除整个布局

1 个答案: