ViewPager在ScrollView中無法正常滑動的問題

重寫ScrollView

方法1：

public class CustomScrollView extends ScrollView {
    private boolean canScroll;

    private GestureDetector mGestureDetector;
    View.OnTouchListener mGestureListener;

    public CustomScrollView(Context context, AttributeSet attrs) {
        super(context, attrs);
        mGestureDetector = new GestureDetector(new YScrollDetector());
        canScroll = true;
    }
    
    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        if(ev.getAction() == MotionEvent.ACTION_UP)
            canScroll = true;
        return super.onInterceptTouchEvent(ev) && mGestureDetector.onTouchEvent(ev);
    }

    class YScrollDetector extends SimpleOnGestureListener {
        @Override
        public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
            if(canScroll)
                if (Math.abs(distanceY) >= Math.abs(distanceX))
                    canScroll = true;
                else
                    canScroll = false;
            return canScroll;
        }
    }
}

方法2：

public class CustomScrollView extends ScrollView {
    // 滑動距離及座標  
    private float xDistance, yDistance, xLast, yLast;  

    public CustomScrollView(Context context, AttributeSet attrs) {  
        super(context, attrs);  
    }  

    @Override  
    public boolean onInterceptTouchEvent(MotionEvent ev) {  
        switch (ev.getAction()) {  
            case MotionEvent.ACTION_DOWN:  
                xDistance = yDistance = 0f;  
                xLast = ev.getX();  
                yLast = ev.getY();  
                break;  
            case MotionEvent.ACTION_MOVE:  
                final float curX = ev.getX();  
                final float curY = ev.getY();  

                xDistance += Math.abs(curX - xLast);  
                yDistance += Math.abs(curY - yLast);  
                xLast = curX;  
                yLast = curY;  

                if(xDistance > yDistance){  
                    return false;  
                }    
        }  

        return super.onInterceptTouchEvent(ev);  
    }  
}