如何获取ViewPager的当前View，这是onPageSelected中向用户显示的一个视图

L. Swifter 发表于 Dev

斯威夫特

我使用这种方法来获取ViewPager的当前View：

private class OuterAdapter extends PagerAdapter{

    private SwipingVideoPage currentPage;

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        SwipingVideoPage page = new SwipingVideoPage();
        container.addView(page);
        return page;
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        container.removeView((View)object);
    }

    @Override
    public void setPrimaryItem(ViewGroup container, int position, Object object) {
        currentPage = (SwipingVideoPage)object;
        super.setPrimaryItem(container, position, object);
    }

    public SwipingVideoPage getCurrenPage() {
        return currentPage;
    }
}

我想我可以打电话ViewPager.getAdapter.getCurrentPage()得到当前的看法。但我发现它不适用于ViewPager.OnPageChangeListener.onPageSelected()：

private class OuterChangeListener implements ViewPager.OnPageChangeListener {

    @Override
    public void onPageSelected(int position) {
        ((OuterAdapter)outerViewPager.getAdapter()).getCurrenPage()  //this returns the previous shown view, not the right one
    }
}

也许onPageSelected()以前叫setPrimaryItem()，这是正确的吗？

以及如何获得ViewPage主要观点onPageSelected()？

斯威夫特

就像@Mohammad Fareed所说的那样，我没有找到直接在中获取当前页面的方法ViewPager。

所以我用这种方式来解决问题：

private Map<Integer, View> pageMap;     //records all the pages in the ViewPager
private SwipingVideoPage currentPage;

private class OuterAdapter extends PagerAdapter{

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        SwipingVideoPage page = new SwipingVideoPage();
        container.addView(page);
        pageMap.put(position, page);    //add page
        return page;
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        container.removeView((View)object);
        pageMap.remove(position);      //remove page which is removed from ViewPager
    }
}

private class OuterChangeListener extends ViewPager.SimpleOnPageChangeListener {

    @Override
    public void onPageSelected(int position) {
        currentPage = pageMap.get(position);    //get current page
    }
}