Question

这是我在viewPager上的监听器：

viewPager.setOnPageChangeListener(new OnPageChangeListener() {

            @Override
            public void onPageSelected(int arg0) {
                pageNr.setText("page: " + (viewPager.getCurrentItem() + 1) + "/" + viewPager.getChildCount());
                currentSlide = viewPager.getCurrentItem();
                page = viewPager.getCurrentItem();
                viewPager.setAdapter(new SubcategoriesPagerAdapter(getActivity(), inflater, videos, numberOfPages));
            }

            @Override
            public void onPageScrolled(int arg0, float arg1, int arg2) {
            }

            @Override
            public void onPageScrollStateChanged(int arg0) {

            }
        });

这是我的按钮：

 nextBtn.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                goToNextSlide();
                pageNr.setText("page: " + (viewPager.getCurrentItem() + 1) + "/" + viewPager.getChildCount());
                if (categ == 2) {
                    numberOfPages = 2;
                }
                viewPager.setAdapter(new SubcategoriesPagerAdapter(getActivity(), inflater, videos, numberOfPages, categ));
            }
        });
        previousBtn.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                goToPreviousSlide();
                pageNr.setText("page: " + (viewPager.getCurrentItem() + 1) + "/" + viewPager.getChildCount());
                if (categ == 2) {
                    numberOfPages = 2;
                }
                viewPager.setAdapter(new SubcategoriesPagerAdapter(getActivity(), inflater, videos, numberOfPages, categ));
            }
        });
      private void goToNextSlide() {
        currentSlide = viewPager.getCurrentItem();
        page = viewPager.getCurrentItem();
        if (currentSlide < viewPager.getChildCount()) {
            viewPager.setCurrentItem(currentSlide + 1);
        }
    }

    private void goToPreviousSlide() {
        currentSlide = viewPager.getCurrentItem();
        page = viewPager.getCurrentItem();
        if (currentSlide > 0) {
            viewPager.setCurrentItem(currentSlide - 1);
        }
    }

现在，如果我按下一个或上一个按钮，它会更改页面，还会更改页面中的图片（我有9张图片，3x3图像视图矩阵）当我滚动到第二页时，有时它会改变图片，有时它不会，而且viewpager也开始变得疯狂，有时候我不能回到第一页，从第二页开始，但是我可以滚动到右边，无限次，但每次显示第二页。我能做什么。或者是否可以使Viewpage不可滚动，所以我只能从按钮更改页面？

Answer 1

创建了一个自定义ViewPager，如下所示：

public class CustomViewPager extends ViewPager {

private boolean isPagingEnabled;

public CustomViewPager(Context context, AttributeSet attrs) {
    super(context, attrs);
    this.isPagingEnabled = true;
}

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

    return false;
}

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

    return false;
}

public void setPagingEnabled(boolean b) {
    this.isPagingEnabled = b;
}
}

Viewpager通过按下按钮将图片从第1页更改为第2页，但不通过滑动

1 个答案: