嗨，我在使用pageViwer和Adapter在3个片段之间滑动时收到此错误。
这是我的pageAdapter
public class FreedomPageAdapter extends FragmentPagerAdapter {
private List<Fragment> listFragment;
public FreedomPageAdapter(FragmentManager fm, List<Fragment> listFragment) {
super(fm);
this.listFragment = listFragment;
}
/*
* (non-Javadoc)
*
* @see android.support.v4.app.FragmentPagerAdapter#getItem(int)
*/
@Override
public Fragment getItem(int position) {
// TODO Auto-generated method stub
return listFragment.get(position);
}
/*
* (non-Javadoc)
*
* @see android.support.v4.view.PagerAdapter#getCount()
*/
@Override
public int getCount() {
// TODO Auto-generated method stub
return listFragment.size();
}
这是我如何定义网页浏览量
viewPager = (ViewPager) findViewById(R.id.pager);
viewPager.setOnPageChangeListener(this);
savedListFragment = new SubscribedFragment();
fragmentList.add(savedListFragment);
fragmentList.add(savedListFragment);
fragmentList.add(savedListFragment);
viewPager.setAdapter(new FreedomPageAdapter(fragmentManager(),
fragmentList));
private FragmentManager fragmentManager() {
return getSupportFragmentManager();
}
private FragmentTransaction getFragmentTransaction() {
return fragmentManager().beginTransaction();
}
页面浏览监听器
/*
* (non-Javadoc)
*
* @see android.support.v4.view.ViewPager.OnPageChangeListener#
* onPageScrollStateChanged(int)
*/
@Override
public void onPageScrollStateChanged(int arg0) {
}
/*
* (non-Javadoc)
*
* @see
* android.support.v4.view.ViewPager.OnPageChangeListener#onPageScrolled
* (int, float, int)
*/
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
/*
* (non-Javadoc)
*
* @see
* android.support.v4.view.ViewPager.OnPageChangeListener#onPageSelected
* (int)
*/
@Override
public void onPageSelected(int position) {
actionBar.setSelectedNavigationItem(position);
}
自定义片段对象
public class SubscribedFragment extends Fragment{
/* (non-Javadoc)
* @see android.app.Fragment#onCreate(android.os.Bundle)
*/
@Override
public void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
}
/* (non-Javadoc)
* @see android.app.Fragment#onCreateView(android.view.LayoutInflater, android.view.ViewGroup, android.os.Bundle)
*/
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
return inflater.inflate(R.layout.discussion_list_layout, container);
}
}
错误的完整堆栈跟踪:
05-02 19:15:44.599: E/AndroidRuntime(19839): FATAL EXCEPTION: main
05-02 19:15:44.599: E/AndroidRuntime(19839): java.lang.IllegalStateException: Can't change tag of fragment SubscribedFragment{41157420 id=0x7f070005 android:switcher:2131165189:0}: was android:switcher:2131165189:0 now android:switcher:2131165189:1
05-02 19:15:44.599: E/AndroidRuntime(19839): at android.support.v4.app.BackStackRecord.doAddOp(BackStackRecord.java:398)
05-02 19:15:44.599: E/AndroidRuntime(19839): at android.support.v4.app.BackStackRecord.add(BackStackRecord.java:389)
05-02 19:15:44.599: E/AndroidRuntime(19839): at android.support.v4.app.FragmentPagerAdapter.instantiateItem(FragmentPagerAdapter.java:99)
05-02 19:15:44.599: E/AndroidRuntime(19839): at android.support.v4.view.ViewPager.addNewItem(ViewPager.java:800)
05-02 19:15:44.599: E/AndroidRuntime(19839): at android.support.v4.view.ViewPager.populate(ViewPager.java:991)
05-02 19:15:44.599: E/AndroidRuntime(19839): at android.support.v4.view.ViewPager.populate(ViewPager.java:880)
05-02 19:15:44.599: E/AndroidRuntime(19839): at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1374)
05-02 19:15:44.599: E/AndroidRuntime(19839): at android.view.View.measure(View.java:15518)
05-02 19:15:44.599: E/AndroidRuntime(19839): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
05-02 19:15:44.599: E/AndroidRuntime(19839): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
05-02 19:15:44.599: E/AndroidRuntime(19839): at android.view.View.measure(View.java:15518)
05-02 19:15:44.599: E/AndroidRuntime(19839): at android.widget.LinearLayout.measureVertical(LinearLayout.java:847)
05-02 19:15:44.599: E/AndroidRuntime(19839): at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
05-02 19:15:44.599: E/AndroidRuntime(19839): at android.view.View.measure(View.java:15518)
05-02 19:15:44.599: E/AndroidRuntime(19839): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
05-02 19:15:44.599: E/AndroidRuntime(19839): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
05-02 19:15:44.599: E/AndroidRuntime(19839): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2434)
05-02 19:15:44.599: E/AndroidRuntime(19839): at android.view.View.measure(View.java:15518)
05-02 19:15:44.599: E/AndroidRuntime(19839): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1874)
05-02 19:15:44.599: E/AndroidRuntime(19839): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1089)
05-02 19:15:44.599: E/AndroidRuntime(19839): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1265)
05-02 19:15:44.599: E/AndroidRuntime(19839): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989)
05-02 19:15:44.599: E/AndroidRuntime(19839): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4351)
05-02 19:15:44.599: E/AndroidRuntime(19839): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
05-02 19:15:44.599: E/AndroidRuntime(19839): at android.view.Choreographer.doCallbacks(Choreographer.java:562)
05-02 19:15:44.599: E/AndroidRuntime(19839): at android.view.Choreographer.doFrame(Choreographer.java:532)
05-02 19:15:44.599: E/AndroidRuntime(19839): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
05-02 19:15:44.599: E/AndroidRuntime(19839): at android.os.Handler.handleCallback(Handler.java:725)
05-02 19:15:44.599: E/AndroidRuntime(19839): at android.os.Handler.dispatchMessage(Handler.java:92)
05-02 19:15:44.599: E/AndroidRuntime(19839): at android.os.Looper.loop(Looper.java:137)
05-02 19:15:44.599: E/AndroidRuntime(19839): at android.app.ActivityThread.main(ActivityThread.java:5226)
05-02 19:15:44.599: E/AndroidRuntime(19839): at java.lang.reflect.Method.invokeNative(Native Method)
05-02 19:15:44.599: E/AndroidRuntime(19839): at java.lang.reflect.Method.invoke(Method.java:511)
05-02 19:15:44.599: E/AndroidRuntime(19839): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795)
05-02 19:15:44.599: E/AndroidRuntime(19839): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:562)
05-02 19:15:44.599: E/AndroidRuntime(19839): at dalvik.system.NativeStart.main(Native Method)
最佳答案
可能是因为您要将相同的片段实例添加了3次到列表中。您应该为每个页面创建一个新实例。
另外，如果您不太熟悉开发工作，我建议您研究FragmentStatePagerAdapter。如果要从主要 Activity 中刷新片段的内容，这可能是一个更好的选择。
关于android - java.lang.IllegalStateException : Can't change tag of fragment，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/16345129/