能够兼容ViewPager的ScrollView

能够兼容ViewPager的ScrollView

ScrollView嵌套ViewPager冲突的解决办法：

/**
 * 能够兼容ViewPager的ScrollView
 * @Description: 解决了ViewPager在ScrollView中的滑动反弹问题
 */
public class ScrollViewExtend extends ScrollView {
    // 滑动距离及坐标
    private float xDistance, yDistance, xLast, yLast;

    public ScrollViewExtend(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);
    }
}