Android 滚动到标签

Question

EDIT2:我会说得更清楚，以便每个人都能理解我的问题。我希望更多的人能帮助我!

我制作的是一个应用程序，其中包含 fragment 和用于在 fragment 之间切换的选项卡。我还可以使用 ViewPager 在 fragment 之间滚动/滑动。

现在唯一的问题是选项卡没有随 fragment 一起滚动。所以当我滑到最后一个 fragment 时，我看不到所选的选项卡，因为它超出了查看范围。

如何在 fragment 之间滑动时滚动到选项卡？

我想我必须对这部分代码做点什么:

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

但我没有任何线索，而且我尝试的一切都不起作用。为了更容易，这里有代码的两个重要部分。我希望有人能帮助我!!

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
    }
}

到目前为止我所做的导致标签消失并在我点击它们时重新出现:

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。希望对您有所帮助!