所以我有3个Sherlock Fragments设置并且与ViewPageIndicator一起正常工作。我现在要做的是在其中一个片段中放置一个TabHost，以便它显示2个单独的标签（在底部）。我相信这意味着我需要再将2个碎片放入由TabHost控制的第3个碎片中。
考虑到需要在Fragment中创建TabHost，我不确定如何正确创建它。
以下是我从this tutorial开始工作的片段的代码，我试图更新以添加TabHost失败：
TestFragment3.java
public class TestFragment3 extends SherlockFragment {
private String mContent = "none";
public static TestFragment3 newInstance(String text) {
TestFragment3 fragment = new TestFragment3();
// Supply num input as an argument.
Bundle args = new Bundle();
args.putString(KEY_TAB_NUM, text);
fragment.setArguments(args);
return fragment;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.activity_main, null);
String text = getString(R.string.tab_page_num) + mContent;
((TextView)view.findViewById(R.id.text)).setText(text);
return view;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mContent = getArguments() != null ? getArguments().getString(KEY_TAB_NUM) : "none";
}
}
MainActivity.java
public class MainActivity extends SherlockFragmentActivity {
private static final String[] TAB_TITLES = new String[] { "This", "Is", "A", "ViewPager" };
TestFragmentAdapter mAdapter;
ViewPager mPager;
PageIndicator mIndicator;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.simple_tabs);
mAdapter = new TestFragmentAdapter(getSupportFragmentManager());
mPager = (ViewPager)findViewById(R.id.pager);
mPager.setAdapter(mAdapter);
mIndicator = (TabPageIndicator)findViewById(R.id.indicator);
mIndicator.setViewPager(mPager);
}
class TestFragmentAdapter extends FragmentPagerAdapter {
private int mCount = TAB_TITLES.length;
public TestFragmentAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
return TestFragment.newInstance(String.valueOf(position));
}
@Override
public int getCount() {
return mCount;
}
@Override
public CharSequence getPageTitle(int position) {
return TAB_TITLES[position];
}
}
}
我是否需要创建一个新的SherlockFragmentActivity并将另外两个SherlockFragments添加到该TabHost？如果是这样，我如何设置MainActivity with 3 Fragments以使用另一个Activity而不是Fragment作为其第三个片段？
我试图将片段放入片段中时出现此错误...
11-14 19:10:54.271: E/AndroidRuntime(2812): java.lang.IllegalStateException: Recursive entry to executePendingTransactions
11-14 19:10:54.271: E/AndroidRuntime(2812): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1388)
11-14 19:10:54.271: E/AndroidRuntime(2812): at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:431)
11-14 19:10:54.271: E/AndroidRuntime(2812): at com.example.demolistview.EventInviteesFragment$TabManager.onTabChanged(EventInviteesFragment.java:152)
11-14 19:10:54.271: E/AndroidRuntime(2812): at android.widget.TabHost.invokeOnTabChangeListener(TabHost.java:391)
11-14 19:10:54.271: E/AndroidRuntime(2812): at android.widget.TabHost.setCurrentTab(TabHost.java:376)
11-14 19:10:54.271: E/AndroidRuntime(2812): at android.widget.TabHost.addTab(TabHost.java:236)
...
...
...
答案 0 :(得分：4)
关于这个问题：
考虑到需要在Fragment中创建TabHost，我不是 确定如何正确创建它。
如果您查看最新的支持演示，他们会举例说明您要实施的内容。可以通过SDK Manager下载它们。
这就是他们如何在片段中嵌套标签主机。该设置使用Child FragmentManager。
public class FragmentTabsFragmentSupport extends Fragment {
private FragmentTabHost mTabHost;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
mTabHost = new FragmentTabHost(getActivity());
mTabHost.setup(getActivity(), getChildFragmentManager(), R.id.fragment1);
mTabHost.addTab(mTabHost.newTabSpec("simple").setIndicator("Simple"),
FragmentStackSupport.CountingFragment.class, null);
mTabHost.addTab(mTabHost.newTabSpec("contacts").setIndicator("Contacts"),
LoaderCursorSupport.CursorLoaderListFragment.class, null);
mTabHost.addTab(mTabHost.newTabSpec("custom").setIndicator("Custom"),
LoaderCustomSupport.AppListFragment.class, null);
mTabHost.addTab(mTabHost.newTabSpec("throttle").setIndicator("Throttle"),
LoaderThrottleSupport.ThrottledLoaderListFragment.class, null);
return mTabHost;
}
@Override
public void onDestroyView() {
super.onDestroyView();
mTabHost = null;
}
}
我还创建了一个小例子，可以在https://github.com/marsucsb/nested-fragments
找到答案 1 :(得分：1)
没有测试过，但应该是这样的
TabFragment extends SherlockFragment {
TabHost mTabHost;
TabManager mTabManager;
mTabHost = (TabHost)findViewById(android.R.id.tabhost);
mTabHost.setup();
mTabManager = new TabManager(this.getActivity(), mTabHost, R.id.realtabcontent);
mTabManager.addTab(mTabHost.newTabSpec("first").setIndicator("First", getResources().getDrawable(R.drawable.ic_tab_first_tab)), FirstFragment.class , null);
mTabManager.addTab(mTabHost.newTabSpec("second").setIndicator("Second", getResources().getDrawable(R.drawable.ic_tab_second_tab)), SecondFragment.class , null);
public static class TabManager implements TabHost.OnTabChangeListener {
private final FragmentActivity mActivity;
private final TabHost mTabHost;
private final int mContainerId;
private final HashMap<String, TabInfo> mTabs = new HashMap<String, TabInfo>();
TabInfo mLastTab;
static final class TabInfo {
private final String tag;
private final Class<?> clss;
private final Bundle args;
private Fragment fragment;
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 TabManager(FragmentActivity activity, TabHost tabHost, int containerId) {
mActivity = activity;
mTabHost = tabHost;
mContainerId = containerId;
mTabHost.setOnTabChangedListener(this);
}
public void addTab(TabHost.TabSpec tabSpec, Class<?> clss, Bundle args) {
tabSpec.setContent(new DummyTabFactory(mActivity));
String tag = tabSpec.getTag();
TabInfo info = new TabInfo(tag, clss, args);
// Check to see if we already have a fragment for this tab, probably
// from a previously saved state. If so, deactivate it, because our
// initial state is that a tab isn't shown.
info.fragment = mActivity.getSupportFragmentManager().findFragmentByTag(tag);
if (info.fragment != null && !info.fragment.isDetached()) {
FragmentTransaction ft = mActivity.getSupportFragmentManager().beginTransaction();
ft.detach(info.fragment);
ft.commitAllowingStateLoss();
}
mTabs.put(tag, info);
mTabHost.addTab(tabSpec);
}
public void onTabChanged(String tabId) {
TabInfo newTab = mTabs.get(tabId);
if (mLastTab != newTab) {
FragmentTransaction ft = mActivity.getSupportFragmentManager().beginTransaction();
if (mLastTab != null) {
if (mLastTab.fragment != null) {
ft.detach(mLastTab.fragment);
}
}
if (newTab != null) {
if (newTab.fragment == null) {
newTab.fragment = Fragment.instantiate(mActivity,
newTab.clss.getName(), newTab.args);
ft.add(mContainerId, newTab.fragment, newTab.tag);
} else {
ft.attach(newTab.fragment);
}
}
mLastTab = newTab;
ft.commitAllowingStateLoss();
mActivity.getSupportFragmentManager().executePendingTransactions();
}
}
}
}
您的图片布局
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TabHost
android:id="@android:id/tabhost"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<LinearLayout
android:orientation="vertical"
android:layout_height="fill_parent"
android:layout_width="fill_parent">
<FrameLayout
android:id="@android:id/tabcontent"
android:layout_width="fill_parent"
android:layout_weight="1"
android:layout_height="wrap_content">
<FrameLayout
android:id="@+id/realtabcontent"
android:layout_width="fill_parent"
android:layout_height="fill_parent"/>
</FrameLayout>
<TabWidget
android:id="@android:id/tabs"
android:layout_width="fill_parent"
android:layout_marginBottom="-4dp"
android:background="#333333"
android:layout_height="wrap_content"
/>
</LinearLayout>
</TabHost>
</LinearLayout>