Viewpage停止向某个方向滑动

Question

如何阻止viewpager仅向一个方向滚动.例如,仅允许向右滑动,但不允许滑动到左侧.我绝对卡住,任何帮助将不胜感激.要注意我需要让它适用于Android 2.2版,所以我使用了兼容性库来查看ViewPager.

提前致谢

Answer 1

您必须创建自己的ViewPager,扩展原始ViewPager并覆盖onTouchEvent方法

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);
        }

    }



}