问题描述

如何阻止 viewpager 仅向一个方向滚动.例如，只允许向右滑动，但不允许向左滑动.我完全被卡住了，任何帮助将不胜感激.请注意，我需要让它适用于 Android 2.2 版，所以我使用 ViewPager 的兼容性库.

How can I stop viewpager from scrolling in one direction only. For example, allow swipes only to the right, but not to the left. I am absolutely stuck, any help would be greatly appreciated. To note that I need to get this to work for Android version 2.2, so I am using the compatibilty library for ViewPager.

提前致谢

推荐答案

你必须制作你自己的 ViewPager 来扩展原来的 ViewPager 并覆盖 onTouchEvent 方法

You will have to make your own ViewPager that extends the original ViewPager and override the onTouchEvent method

public class CustomViewPager extends ViewPager {

    float lastX = 0;

    boolean lockScroll = false;

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

    public CustomViewPager(Context context) {
        super(context);
    }

    @Override
    public boolean onTouchEvent(MotionEvent ev) {

        switch (ev.getAction()) {
        case MotionEvent.ACTION_DOWN:
            lastX = ev.getX();
            lockScroll = false;
            return super.onTouchEvent(ev);
        case MotionEvent.ACTION_MOVE:

            if (lastX > ev.getX()) {
                lockScroll = false;
            } else {
                lockScroll = true;
            }

            lastX = ev.getX();
            break;
        }

        lastX = ev.getX();

        if(lockScroll) {
            return false;
        } else {
            return super.onTouchEvent(ev);
        }

    }



}

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