Android 安卓-点击一次就可以改变页面中的页面片段

使用此适配器，我在

TabHost

中获得了一个

ViewPager

：

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    View v = inflater.inflate(R.layout.fragment_home, container, false);


    mTabHost = (TabHost) v.findViewById(android.R.id.tabhost);
    mTabHost.setup();

    mViewPager = (ViewPager) v.findViewById(R.id.pager_home);
    mTabsAdapter = new TabsAdapter(getActivity(), mTabHost, mViewPager);

    // Here we load the content for each tab. 
    mTabsAdapter.addTab(mTabHost.newTabSpec("one").setIndicator("Recently Viewed"), PageOne.class, null);
    mTabsAdapter.addTab(mTabHost.newTabSpec("two").setIndicator("Offers"), PageTwo.class, null);
    //mTabsAdapter.addTab(mTabHost.newTabSpec("two").setIndicator("Experiences"), ExperiencesTab.class, null);

    return v;
}

public static class TabsAdapter extends FragmentPagerAdapter implements TabHost.OnTabChangeListener, ViewPager.OnPageChangeListener
{
    private final Context mContext;
    private final TabHost mTabHost;
    private final ViewPager mViewPager;
    private final ArrayList<TabInfo> mTabs = new ArrayList<TabInfo>();

    static final class TabInfo
    {
        private final String tag;
        private final Class<?> clss;
        private final Bundle args;

        TabInfo(String _tag, Class<?> _class, Bundle _args)
        {
            tag = _tag;
            clss = _class;
            args = _args;
        }
    }

    static class DummyTabFactory implements TabHost.TabContentFactory
    {
        private final Context mContext;

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

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

    public TabsAdapter(FragmentActivity activity, TabHost tabHost, ViewPager pager)
    {
        super(activity.getSupportFragmentManager());
        mContext = activity;
        mTabHost = tabHost;
        mViewPager = pager;
        mTabHost.setOnTabChangedListener(this);
        mViewPager.setAdapter(this);
        mViewPager.setOnPageChangeListener(this);
    }

    public void addTab(TabHost.TabSpec tabSpec, Class<?> clss, Bundle args)
    {
        tabSpec.setContent(new DummyTabFactory(mContext));
        String tag = tabSpec.getTag();

        TabInfo info = new TabInfo(tag, clss, args);
        mTabs.add(info);
        mTabHost.addTab(tabSpec);
        notifyDataSetChanged();
    }

    @Override
    public int getCount()
    {
        return mTabs.size();
    }

    @Override
    public Fragment getItem(int position)
    {
        TabInfo info = mTabs.get(position);

        return Fragment.instantiate(mContext, info.clss.getName(), info.args);

    }

    public void onTabChanged(String tabId)
    {
        int position = mTabHost.getCurrentTab();
        mViewPager.setCurrentItem(position);

    }

    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels)
    {
    }

    public void onPageSelected(int position)
    {
        // Unfortunately when TabHost changes the current tab, it kindly
        // also takes care of putting focus on it when not in touch mode.
        // The jerk.
        // This hack tries to prevent this from pulling focus out of our
        // ViewPager.
        TabWidget widget = mTabHost.getTabWidget();
        int oldFocusability = widget.getDescendantFocusability();
        widget.setDescendantFocusability(ViewGroup.FOCUS_BLOCK_DESCENDANTS);
        mTabHost.setCurrentTab(position);
        widget.setDescendantFocusability(oldFocusability);

    }

    public void onPageScrollStateChanged(int state)
    {
    }
}

但是选项卡仍然是空的，里面什么也没有显示。

---

如您所见，我还需要将新片段放在后堆栈中，这样当我按back时，将再次加载上一个片段。

u可以使用mTabHost.setCurrentTab（1）；在选项卡中显示初始片段时，prolem不可用。我可以通过列表视图看到片段。问题是如何在单击列表项后切换同一选项卡内的片段。ViewPager应负责片段的生命周期，我将更改

getItem（int position）

函数，以考虑您在onclick函数上设置的全局变量，以便像现在一样创建片段，或者创建所需的新片段，然后刷新适配器。@EvripidisDrakos我需要将片段添加到后堆栈中，以便在按“上一步”按钮时，加载上一个片段。您的解决方案听起来好像没有处理好它。然后只需覆盖“上一步”按钮，再次更新该全局变量，并再次调用adpater上的notifyDataChanged（其getItemPosition返回POSITION_NONE，以使其正常工作）。这就是我无论如何都会尝试的。如果您不想这样做，可以尝试使用

getChildFragmentManager（）

而不是

getSupportFragmentManager（）

在哪里添加该代码？它将如何加载我想要的新片段？

widget.getChildAt(0).setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        tHost.setCurrentTab(0);

        ((ViewPager) mViewPager).setCurrentItem(0);

        /// perform fragment transaction here
    }
});

widget.getChildAt(0).setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        tHost.setCurrentTab(0);

        ((ViewPager) mViewPager).setCurrentItem(0);

        /// perform fragment transaction here
    }
});