如何对齐的android活动标签中心滑动的拉布局

问题描述

我有12个项目在机器人滑动的拉布局+查看传呼机。而从左侧滑动到右侧，所选标签应中心一样玩店。请帮我该怎么做。在我的应用程序激活的标签总是留给屏幕。

I have 12 items in android sliding tab layout + view pager. While sliding from left to right, selected tab should be center same as play store. Please help me how to do that. In my application active tab is always left of the screen.

推荐答案

我的做法还是有些不同的的的溶液，将其反弹的标签在滑动的末端。

My approach differs a bit of the Shripad Bhat solution, which bounce the tab at the end of the slide.

下面是我的解决办法......

Here's my workaround...

更改为 onPageScrolled 方法：

@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
    int tabStripChildCount = mTabStrip.getChildCount();
    if ((tabStripChildCount == 0) || (position < 0) || (position >= tabStripChildCount)) {
        return;
    }

    mTabStrip.onViewPagerPageChanged(position, positionOffset);

    View selectedTitle = mTabStrip.getChildAt(position);
    int selectedOffset = (selectedTitle == null) ? 0 : selectedTitle.getWidth();
    int nextTitlePosition = position + 1;
    View nextTitle = mTabStrip.getChildAt(nextTitlePosition);
    int nextOffset = (nextTitle == null) ? 0 : nextTitle.getWidth();
    int extraOffset = (int)(0.5F * (positionOffset * (float)(selectedOffset + nextOffset)));
    scrollToTab(position, extraOffset);

    if (mViewPagerPageChangeListener != null) {
        mViewPagerPageChangeListener.onPageScrolled(position, positionOffset, positionOffsetPixels);
    }
}

更改为 scrollToTab 方法：

private int mLastScrollTo;

private void scrollToTab(int tabIndex, int positionOffset) {
    final int tabStripChildCount = mTabStrip.getChildCount();
    if (tabStripChildCount == 0 || tabIndex < 0 || tabIndex >= tabStripChildCount) {
        return;
    }

    View selectedChild = mTabStrip.getChildAt(tabIndex);
    if (selectedChild != null && selectedChild.getMeasuredWidth() != 0) {

        int targetScrollX = ((positionOffset + selectedChild.getLeft()) - getWidth() / 2) + selectedChild.getWidth() / 2;

        if (targetScrollX != mLastScrollTo) {
            scrollTo(targetScrollX, 0);
            mLastScrollTo = targetScrollX;
        }
    }
}

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