如何解决ViewPager在ScrollView中滑动经常失效、无法正常滑动问题。重写ScrollView的onInterceptTouchEvent函数

本文主要介绍如何解决ViewPager在ScrollView中滑动经常失效、无法正常滑动问题。
解决方法只需要在接近水平滚动时ScrollView不处理事件而交由其子View(即这里的ViewPager)处理即可，重写ScrollView的onInterceptTouchEvent函数，如下：

public class VerticalScrollView extends ScrollView {

    private GestureDetector mGestureDetector;

    public VerticalScrollView(Context context, AttributeSet attrs){
        super(context, attrs);
        mGestureDetector = new GestureDetector(context, new YScrollDetector());
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        return super.onInterceptTouchEvent(ev) && mGestureDetector.onTouchEvent(ev);
    }

    class YScrollDetector extends SimpleOnGestureListener {

        @Override
        public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
            /**
             * if we're scrolling more closer to x direction, return false, let subview to process it
             */
            return (Math.abs(distanceY) > Math.abs(distanceX));
        }
    }
}

public class VerticalScrollView extends ScrollView {

private GestureDetector mGestureDetector;

public VerticalScrollView(Context context, AttributeSet attrs){

super(context, attrs);

mGestureDetector = new GestureDetector(context, new YScrollDetector());

}

@Override

public boolean onInterceptTouchEvent(MotionEvent ev) {

return super.onInterceptTouchEvent(ev) && mGestureDetector.onTouchEvent(ev);

}

class YScrollDetector extends SimpleOnGestureListener {

@Override

public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {

/**

* if we're scrolling more closer to x direction, return false, let subview to process it

return (Math.abs(distanceY) > Math.abs(distanceX));

}

再将xml中的ScrollView改为<com.xxx.xxx.VerticalScrollView即可

本方法同样适用于ScrollView中ListView等其他View无法滚动。

相关博客：
ViewPager使用可参考：利用ViewPager、Fragment、PagerTabStrip实现多页面滑动效果
RelativeLayout与ScrollView共用问题：添加ScrollView后或外部容器为RelativeLayout时onFling不起作用，无法滑动问题

Trinea

Author of the Dev Tools App, https://coolapk.com/apk/cn.trinea.android.developertools

ScrollView中ViewPager无法正常滑动问题

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