我正在使用FragmentActivity实现tabhost,在第一个选项卡下我加载一个包含Viewpager和CirclePageIndIcator的欢迎片段,我需要在WelcomeFragment的一侧加载4个视图
这是我的WelcomeFragment
public class WelcomeFragment extends Fragment
{
PageAdapter mAdapter;
ViewPager mPager;
CirclePageIndicator mIndicator;
List<Fragment> fragments;
@Override
public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.frag_welcome_layout,null);
mPager=(ViewPager)view.findViewById(R.id.myViewPager);
mIndicator=(CirclePageIndicator)view.findViewById(R.id.circlePageIndicator1);
fragments=new ArrayList<Fragment>();
return view;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
Fragment fragment;
for(int i=0;i<4;i++)
{
fragment= Fragment.instantiate(getActivity(),TipsFragment.class.getName());
fragments.add(fragment);
}
mAdapter = new PageAdapter(getFragmentManager(),fragments);
mPager.setAdapter(mAdapter);
mIndicator.setViewPager(mPager);
}
}
这是我的页面适配器
public class PageAdapter extends FragmentPagerAdapter implements Serializable{
List<Fragment> fragments;
public PageAdapter(FragmentManager fm,List<Fragment> frags) {
super(fm);
fragments = frags;
}
@Override
public Fragment getItem(int arg0) {
// TODO Auto-generated method stub
return TipsFragment.newInstance(0,0);
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return 4;
}
@Override
public void destroyItem(ViewGroup container,int position,Object object) {
FragmentManager manager = ((Fragment) object).getFragmentManager();
FragmentTransaction trans = manager.beginTransaction();
trans.remove((Fragment) object);
trans.commit();
super.destroyItem(container,position,object);
}
}
当我首先加载应用程序时,tabFragmentActivity成功加载,并且welcomeFragment中的viewpager工作正常,但是当我移动到第二个选项卡并再次返回第一个选项卡时,ViewPager无法成功加载.
我怎么解决呢？
根据建议,我使用了getChildFragmentManager但是app崩溃了
logcat中的错误
09-09 13:28:39.412: E/AndroidRuntime(3100): FATAL EXCEPTION: main 09-09 13:28:39.412: E/AndroidRuntime(3100): java.lang.IllegalStateException: No activity 09-09 13:28:39.412: E/AndroidRuntime(3100): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1091) 09-09 13:28:39.412: E/AndroidRuntime(3100): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1086) 09-09 13:28:39.412: E/AndroidRuntime(3100): at android.support.v4.app.FragmentManagerImpl.dispatchActivityCreated(FragmentManager.java:1877) 09-09 13:28:39.412: E/AndroidRuntime(3100): at android.support.v4.app.Fragment.performActivityCreated(Fragment.java:1492) 09-09 13:28:39.412: E/AndroidRuntime(3100): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:947) 09-09 13:28:39.412: E/AndroidRuntime(3100): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104) 09-09 13:28:39.412: E/AndroidRuntime(3100): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682) 09-09 13:28:39.412: E/AndroidRuntime(3100): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1460) 09-09 13:28:39.412: E/AndroidRuntime(3100): at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:440) 09-09 13:28:39.412: E/AndroidRuntime(3100): at android.os.Handler.handleCallback(Handler.java:725) 09-09 13:28:39.412: E/AndroidRuntime(3100): at android.os.Handler.dispatchMessage(Handler.java:92) 09-09 13:28:39.412: E/AndroidRuntime(3100): at android.os.Looper.loop(Looper.java:137) 09-09 13:28:39.412: E/AndroidRuntime(3100): at android.app.ActivityThread.main(ActivityThread.java:5041) 09-09 13:28:39.412: E/AndroidRuntime(3100): at java.lang.reflect.Method.invokeNative(Native Method) 09-09 13:28:39.412: E/AndroidRuntime(3100): at java.lang.reflect.Method.invoke(Method.java:511) 09-09 13:28:39.412: E/AndroidRuntime(3100): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 09-09 13:28:39.412: E/AndroidRuntime(3100): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 09-09 13:28:39.412: E/AndroidRuntime(3100): at dalvik.system.NativeStart.main(Native Method
)
解决方法
如果您在片段中使用ViewPager,则在创建新适配器时,应使用ChildFragmentManager：
getChildFragmentManager()
