Question

我有一个nested scrollview和一个button。我想在scrollview滚动时隐藏按钮，并在滚动停止时显示button，而与上滚动和下滚动无关。有人帮忙。

Answer 1

最后我找到了解决方法。

scrollView.setOnTouchListener(object : View.OnTouchListener {
            override fun onTouch(p0: View?, p1: MotionEvent?): Boolean {
                when (p1!!.getAction()) {
                    MotionEvent.ACTION_SCROLL, MotionEvent.ACTION_MOVE -> {
                        closeCaseButton.visibility = View.INVISIBLE
                    }
                    MotionEvent.ACTION_CANCEL, MotionEvent.ACTION_UP -> {
                        closeCaseButton.visibility = View.VISIBLE
                    }
                }
                return false
            }
        })

Answer 2

您可以使用此侦听器

getResourceAsStream()

Answer 3

尝试使用如下所示的NestedScrollview列表器

 nestedScrollView.setOnScrollChangeListener(new NestedScrollView.OnScrollChangeListener() {
        @Override
        public void onScrollChange(NestedScrollView v, int scrollX, int scrollY, int oldScrollX, int oldScrollY) {
            if(scrollY>oldScrollY){
              //your visibility code here
            }
        }
    });

此处

scrollX =新的水平滚动位置

oldScrollX =上一个水平滚动位置

scrollY =新的垂直滚动位置

oldScrollY =先前的垂直滚动位置

更新

如果您正在使用回收站并希望监视滚动状态，请尝试以下操作，这可能有帮助

 recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrollStateChanged(@NonNull RecyclerView recyclerView, int scrollState) {
                super.onScrollStateChanged(recyclerView, scrollState);
                switch(scrollState) {
                    case 2: // SCROLL_STATE_FLING 
                        //hide button here
                        break;

                    case 1: // SCROLL_STATE_TOUCH_SCROLL 
                        //hide button here
                        break;

                    case 0: // SCROLL_STATE_IDLE 
                        //show button here
                        break;

                    default:
                        //show button here
                        break;
                }
            }

            @Override
            public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
                super.onScrolled(recyclerView, dx, dy);
            }
        });

Answer 4

以这种方式检查

        nested_scroll.setOnScrollChangeListener(object : NestedScrollView.OnScrollChangeListener() {
        fun onScrollChange(v: NestedScrollView, scrollX: Int, scrollY: Int, oldScrollX: Int, oldScrollY: Int) {

            if (scrollY > oldScrollY) {
                Log.e("#####", "Scroll Down")
            } else if (scrollY < oldScrollY) {
                Log.e("#####", "Scroll Up")
            } else if (scrollY == 0) {
                Log.e("#####", "Top Scroll")
            } else if (scrollY == v.getMeasuredHeight() - v.getChildAt(0).getMeasuredHeight()) {
                Log.e("#####", "Bottom Scroll")
            }
        }
    })

在滚动ScrollView android上显示和隐藏按钮

4 个答案: