滾動監(jiān)聽

1. 滾動到底部

   // 滾動到底
   if (scrollY == (v.getChildAt(0).getMeasuredHeight() - v.getMeasuredHeight())) {
   Log.i(TAG, "BOTTOM SCROLL");
   }

2. 滾動到頂

   if (scrollY == 0) {// 滾動到頂
   Log.i(TAG, "TOP SCROLL");
   }

完整代碼如下:

svscrollouter.setOnScrollChangeListener(new NestedScrollView.OnScrollChangeListener() {
            @Override
            public void onScrollChange(NestedScrollView v, int scrollX, int scrollY, int oldScrollX, int oldScrollY) {

                //Log.e(TAG, "onScrollChange: " + scrollX +"---" + scrollY + "----" +oldScrollX + "---" + oldScrollY );
                //監(jiān)聽滾動狀態(tài)

                if (scrollY > oldScrollY) {//向下滾動
                    Log.i(TAG, "Scroll DOWN");
                }
                if (scrollY < oldScrollY) {//向上滾動
                    Log.i(TAG, "Scroll UP");
                }

                if (scrollY == 0) {// 滾動到頂
                    Log.i(TAG, "TOP SCROLL");
                }
                // 滾動到底
                if (scrollY == (v.getChildAt(0).getMeasuredHeight() - v.getMeasuredHeight())) {
                    Log.i(TAG, "BOTTOM SCROLL");
                }

                //判斷某個(gè)控件是否可見
                Rect scrollBounds = new Rect();
                svscrollouter.getHitRect(scrollBounds);
                if (tvscrollthree.getLocalVisibleRect(scrollBounds)) {//可見
                    Log.e(TAG, "onScrollChange:  第3個(gè)可見" );
                }else {//完全不可見
                    Log.e(TAG, "onScrollChange:  第3個(gè)不可見" );
                }



//                Log.e(TAG, "onScrollChange: ------------" + scrollY +"------"+ tvscrollthree.getTop() );
//                //判斷某個(gè)控件是否滾到頂部
//                if (scrollY == tvscrollthree.getTop()){
//                    Log.i(TAG, "onScrollChange: ------top-------" );
//                }
//
//                Log.e(TAG, "onScrollChange: bottmo" + scrollY +"-----"+ (tvscrollthree.getTop() + tvscrollthree.getHeight()) );


            }
        });

滾動控制

• 1. 滾動到底部

 svscrollouter.fullScroll(NestedScrollView.FOCUS_DOWN);

• 2. 滾動到頂部

 svscrollouter.fullScroll(NestedScrollView.FOCUS_UP);

• 3. 滾動到摸個(gè)控件的頂部或底部

 //頂部
 svscrollouter.scrollTo(0,tvscrollfour.getTop());
 //底部
svscrollouter.scrollTo(0,tvscrollthree.getBottom());

判斷某個(gè)子控件是否顯示

    //判斷某個(gè)控件是否可見
                Rect scrollBounds = new Rect();
                svscrollouter.getHitRect(scrollBounds);
                if (tvscrollthree.getLocalVisibleRect(scrollBounds)) {//可見
                    Log.e(TAG, "onScrollChange:  第3個(gè)可見" );
                }else {//完全不可見
                    Log.e(TAG, "onScrollChange:  第3個(gè)不可見" );
                }