包装在 Horizo​​ntalScrollView 中的 TabWidget 不使用 ViewPager 滚动 [英] TabWidget wrapped in HorizontalScrollView doesn't scroll with ViewPager

问题描述

我不得不使用 TabHost 代替 ActionBarTabs 并使它们可滚动，我将 TabWidget 包装在Horizo​​ntalScrollView，但 Horizo​​ntalScrollView 不会按照 ViewPager 自行滚动.我已经尝试以几种不同的方式使用 scrollTo 和 fullScroll ，但它并没有改变任何东西.我需要做什么才能使其正常工作?

I'm having to use TabHost in place of ActionBarTabs and to make them scroll-able I've wrapped my TabWidget in a HorizontalScrollView, but the HorizontalScrollView doesn't scroll itself in accordance with ViewPager. I've tried using scrollTo and fullScroll in a couple of different ways, but it doesn't change anything. What do I need to do to get this working correctly?

<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/tabhost"
android:layout_width="match_parent"
android:layout_height="match_parent" >

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <HorizontalScrollView
        android:id="@id/horizontalScrollView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:fillViewport="true"
        android:scrollbars="@null" >

        <TabWidget
            android:id="@android:id/tabs"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal" />
    </HorizontalScrollView>

    <FrameLayout
        android:id="@android:id/tabcontent"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_weight="0" />

    <android.support.v4.view.ViewPager
        android:id="@id/viewPager"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1" />

</LinearLayout>

        @Override
    public void onTabChanged(String tabId) {
        int position = mTabHost.getCurrentTab();
        mViewPager.setCurrentItem(position);
        mHorizontalScrollView.scrollTo(position, 0);
    }

    @Override
    public void onPageScrolled(int position, float positionOffset,
            int positionOffsetPixels) {
        mHorizontalScrollView.scrollTo(position, 0);
    }

推荐答案

调用.scrollTo(x,y)后调用.refreshDrawableState()会改变水平滚动视图 方法.

The horizontal scroll view will change when you call .refreshDrawableState() after calling the .scrollTo(x,y) method.

要注意的另一件事是 .scrollTo(x,y) 滚动以使 x 位于屏幕的左侧.您可能需要对选项卡的坐标和水平滚动视图的宽度进行一些数学运算才能正确定位.你不能调用 .scrollTo(position,0) 并让它按照你想要的方式工作(除非你的标签是 1 像素宽).

Another thing to watch out for is that .scrollTo(x,y) scrolls such that x is positioned on the left side of the screen. You may need to do some math with the coordinates of your tabs and the width of the horizontal scroll view to position things correctly. You can't call .scrollTo(position,0) and have it work the way you'd like (unless your tabs are 1 pixel wide).

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