Question

EDIT2 ：我会更清楚，所以每个人都理解我的问题。我希望更多的人可以帮助我！

我所做的是一个包含片段和标签的应用程序，用于在片段之间切换。我还可以使用ViewPager在片段之间滚动/滑动。

现在唯一的问题是标签不会与片段一起滚动。因此，当我滑动到最后一个片段时，我看不到所选的标签，因为它超出了观察范围。

当我在片段之间滑动时，如何才能滚动到标签？

我想我必须对这段代码做点什么：

public void onPageSelected(int position) {
    // TODO Auto-generated method stub
    this.mTabHost.setCurrentTab(position);
}

但我没有任何线索，我尝试的一切都行不通。为了使更容易，这里是代码的两个重要部分。我希望有人可以帮助我!!

我的主要代码：

public class MainActivity extends FragmentActivity implements TabHost.OnTabChangeListener, ViewPager.OnPageChangeListener {

    private TabHost mTabHost;
    private ViewPager mViewPager;
    private HashMap<String, TabInfo> mapTabInfo = new HashMap<String, MainActivity.TabInfo>();
    private PagerAdapter mPagerAdapter;

    private class TabInfo {
         private String tag;
         TabInfo(String tag, Class<?> clazz, Bundle args) {
             this.tag = tag;
         }
    }

    class TabFactory implements TabContentFactory {
        private final Context mContext;

        public TabFactory(Context context) {
            mContext = context;
        }

        public View createTabContent(String tag) {
            View v = new View(mContext);
            v.setMinimumWidth(0);
            v.setMinimumHeight(0);
            return v;
        }
    }

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.tabs_layout);
        this.initialiseTabHost(savedInstanceState);
        if (savedInstanceState != null) {
            mTabHost.setCurrentTabByTag(savedInstanceState.getString("tab"));
        }
        this.intialiseViewPager();
    }

    protected void onSaveInstanceState(Bundle outState) {
        outState.putString("tab", mTabHost.getCurrentTabTag());
        super.onSaveInstanceState(outState);
    }

    private void intialiseViewPager() {
        List<Fragment> fragments = new Vector<Fragment>();
        fragments.add(Fragment.instantiate(this, TabFragment1.class.getName()));
        fragments.add(Fragment.instantiate(this, TabFragment2.class.getName()));
        fragments.add(Fragment.instantiate(this, TabFragment3.class.getName()));
        fragments.add(Fragment.instantiate(this, TabFragment4.class.getName()));
        fragments.add(Fragment.instantiate(this, TabFragment5.class.getName()));
        this.mPagerAdapter  = new PagerAdapter(super.getSupportFragmentManager(), fragments);
        //
        this.mViewPager = (ViewPager)super.findViewById(R.id.viewpager);
        this.mViewPager.setAdapter(this.mPagerAdapter);
        this.mViewPager.setOnPageChangeListener(this);
    }

    private void initialiseTabHost(Bundle args) {
        mTabHost = (TabHost)findViewById(android.R.id.tabhost);
        mTabHost.setup();
        TabInfo tabInfo = null;
        MainActivity.AddTab(this, this.mTabHost, this.mTabHost.newTabSpec("Tab1").setIndicator("Home"), ( tabInfo = new TabInfo("Tab1", TabFragment1.class, args)));
        this.mapTabInfo.put(tabInfo.tag, tabInfo);
        MainActivity.AddTab(this, this.mTabHost, this.mTabHost.newTabSpec("Tab2").setIndicator("Messages"), ( tabInfo = new TabInfo("Tab2", TabFragment2.class, args)));
        this.mapTabInfo.put(tabInfo.tag, tabInfo);
        MainActivity.AddTab(this, this.mTabHost, this.mTabHost.newTabSpec("Tab3").setIndicator("Search"), ( tabInfo = new TabInfo("Tab3", TabFragment3.class, args)));
        this.mapTabInfo.put(tabInfo.tag, tabInfo);
        MainActivity.AddTab(this, this.mTabHost, this.mTabHost.newTabSpec("Tab4").setIndicator("Profile"), ( tabInfo = new TabInfo("Tab4", TabFragment4.class, args)));
        this.mapTabInfo.put(tabInfo.tag, tabInfo);
        MainActivity.AddTab(this, this.mTabHost, this.mTabHost.newTabSpec("Tab5").setIndicator("Settings"), ( tabInfo = new TabInfo("Tab5", TabFragment5.class, args)));
        this.mapTabInfo.put(tabInfo.tag, tabInfo);
        mTabHost.setOnTabChangedListener(this);
    }

    private static void AddTab(MainActivity activity, TabHost tabHost, TabHost.TabSpec tabSpec, TabInfo tabInfo) {
        tabSpec.setContent(activity.new TabFactory(activity));
        tabHost.addTab(tabSpec);
    }

    public void onTabChanged(String tag) {
        int pos = this.mTabHost.getCurrentTab();
        this.mViewPager.setCurrentItem(pos);
    }

    public void onPageScrolled(int position, float positionOffset,
            int positionOffsetPixels) {
        // TODO Auto-generated method stub
    }

    public void onPageSelected(int position) {
        // TODO Auto-generated method stub
        this.mTabHost.setCurrentTab(position);
    }

    public void onPageScrollStateChanged(int state) {
        // TODO Auto-generated method stub
    }
}

当我点击它们时，我所做的事情就会导致消失并重新燃烧：

public void onPageSelected(int position) {
    // TODO Auto-generated method stub
    this.mTabHost.setCurrentTab(position);

    this.hScrollView = (HorizontalScrollView)super.findViewById(R.id.scroller);
    this.hScrollView.scrollTo(((int)(mTabHost.getWidth() * (position / ((double)(mTabHost.getChildCount() - 1))))), 0);
}

Answer 1

我不知道答案，但是this guy为你正在做的事情实现了一个开源库。希望有所帮助！

Answer 2

我感谢Josh（见他对答案的评论！）。非常感谢Josh！

它现在工作正常，这是我用它的代码：

public void onPageSelected(int position) {
    // TODO Auto-generated method stub
    this.mTabHost.setCurrentTab(position);
    this.hScrollView = (HorizontalScrollView)super.findViewById(R.id.scroller);
    this.hScrollView.scrollTo(((int)(mTabHost.getWidth() * (position / ((double)(4 - 1))))), 0);
}

Android滚动到标签

2 个答案: