禁止ViewPager向左或右滑动或全部或禁止滑动

最新推荐文章于 2023-11-29 10:10:19 发布

u010563605

最新推荐文章于 2023-11-29 10:10:19 发布

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文章标签：安卓

本文链接：https://blog.youkuaiyun.com/u010563605/article/details/111180583

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这篇博客介绍了如何创建一个枚举类型`SwipeDirection`，并扩展`ViewPager`以支持指定滑动方向。通过设置`allowedSwipeDirection`，可以禁用或允许从左到右、从右到左或任何方向的滑动。这为自定义视图滚动提供了灵活性。

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1.创建枚举

 public enum SwipeDirection {
    all, left, right, none ;
}

2.扩展ViewPager

public class CustomViewPager extends ViewPager {

    private float initialXValue;
    private SwipeDirection direction;

    public CustomViewPager(Context context, AttributeSet attrs) {
        super(context, attrs);
        this.direction = SwipeDirection.all;
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (this.IsSwipeAllowed(event)) {
            return super.onTouchEvent(event);
        }

        return false;
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent event) {
        if (this.IsSwipeAllowed(event)) {
            return super.onInterceptTouchEvent(event);
        }

        return false;
    }

    private boolean IsSwipeAllowed(MotionEvent event) {
        if(this.direction == SwipeDirection.all) return true;

        if(direction == SwipeDirection.none )//disable any swipe
            return false;

        if(event.getAction()==MotionEvent.ACTION_DOWN) {
            initialXValue = event.getX();
            return true;
        }

        if(event.getAction()==MotionEvent.ACTION_MOVE) {
            try {
                float diffX = event.getX() - initialXValue;
                if (diffX > 0 && direction == SwipeDirection.right ) {
                    // swipe from left to right detected
                    return false;
                }else if (diffX < 0 && direction == SwipeDirection.left ) {
                    // swipe from right to left detected
                    return false;
                }
            } catch (Exception exception) {
                exception.printStackTrace();
            }
        }

        return true;
    }

    public void setAllowedSwipeDirection(SwipeDirection direction) {
        this.direction = direction;
    }

3.在布局中使用viewPager
4.在代码中启用任何滑动方向。

mViewPager.setAllowedSwipeDirection(SwipeDirection.right);