IllegalStateException异常:无法更改片段的容器ID [英] IllegalStateException: Can't change container ID of Fragment
问题描述
Android平台:3.1
Android platform: 3.1
我试图将一个片段容器中的一个容器B.这里沿用了code来实现:
I am trying to move a fragment from a container A to a container B. Here follows the code to accomplish this:
private void reattach(int newContainerId, Fragment frag, String tag) {
if (frag == null || !frag.isAdded() || (frag.getId() == newContainerId)) { return; }
final FragmentManager fm = getFragmentManager();
FragmentTransaction ft = fm.beginTransaction();
ft.remove(frag); //stacco il frammento dal container A
ft.commit();
fm.executePendingTransactions();
ft = fm.beginTransaction();
ft.add(newContainerId, frag, tag); //attacco il frammento sul container D
ft.commit();
fm.executePendingTransactions();
}
当我运行的系统中,我得到了以下IllegalStateException异常:
When I run the system, I get the following IllegalStateException:
03-26 00:13:14.829: E/AndroidRuntime(30090): java.lang.RuntimeException: Unable to start activity ComponentInfo{eu.areamobile.apps.sfa/eu.areamobile.apps.sfa.activity.HomeActivity}: java.lang.IllegalStateException: Can't change container ID of fragment FragmentHomeController{408202a8 id=0x7f050010 HomeController}: was 2131034128 now 2131034132
03-26 00:13:14.829: E/AndroidRuntime(30090): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1751)
03-26 00:13:14.829: E/AndroidRuntime(30090): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1767)
03-26 00:13:14.829: E/AndroidRuntime(30090): at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3117)
03-26 00:13:14.829: E/AndroidRuntime(30090): at android.app.ActivityThread.access$1600(ActivityThread.java:122)
03-26 00:13:14.829: E/AndroidRuntime(30090): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1009)
03-26 00:13:14.829: E/AndroidRuntime(30090): at android.os.Handler.dispatchMessage(Handler.java:99)
03-26 00:13:14.829: E/AndroidRuntime(30090): at android.os.Looper.loop(Looper.java:132)
03-26 00:13:14.829: E/AndroidRuntime(30090): at android.app.ActivityThread.main(ActivityThread.java:4028)
03-26 00:13:14.829: E/AndroidRuntime(30090): at java.lang.reflect.Method.invokeNative(Native Method)
03-26 00:13:14.829: E/AndroidRuntime(30090): at java.lang.reflect.Method.invoke(Method.java:491)
03-26 00:13:14.829: E/AndroidRuntime(30090): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:844)
03-26 00:13:14.829: E/AndroidRuntime(30090): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602)
03-26 00:13:14.829: E/AndroidRuntime(30090): at dalvik.system.NativeStart.main(Native Method)
03-26 00:13:14.829: E/AndroidRuntime(30090): Caused by: java.lang.IllegalStateException: Can't change container ID of fragment FragmentHomeController{408202a8 id=0x7f050010 HomeController}: was 2131034128 now 2131034132
03-26 00:13:14.829: E/AndroidRuntime(30090): at android.app.BackStackRecord.doAddOp(BackStackRecord.java:338)
03-26 00:13:14.829: E/AndroidRuntime(30090): at android.app.BackStackRecord.add(BackStackRecord.java:316)
03-26 00:13:14.829: E/AndroidRuntime(30090): at eu.areamobile.apps.sfa.activity.HomeActivity.reattach(HomeActivity.java:340)
03-26 00:13:14.829: E/AndroidRuntime(30090): at eu.areamobile.apps.sfa.activity.HomeActivity.customHideShowCreate(HomeActivity.java:253)
03-26 00:13:14.829: E/AndroidRuntime(30090): at eu.areamobile.apps.sfa.activity.HomeActivity.customHideShowCreate(HomeActivity.java:155)
03-26 00:13:14.829: E/AndroidRuntime(30090): at eu.areamobile.apps.sfa.activity.HomeActivity.onPostCreate(HomeActivity.java:66)
03-26 00:13:14.829: E/AndroidRuntime(30090): at android.app.Instrumentation.callActivityOnPostCreate(Instrumentation.java:1111)
03-26 00:13:14.829: E/AndroidRuntime(30090): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1734)
在一个快速的调试,我注意到,在Android 3.1的FragmentTransaction.remove不为0的片段的mContainerId被删除,而在ICS它工作正常。
任何建议或解决方法?
After a quick debug, I noticed that on Android 3.1 the FragmentTransaction.remove doesn't set to 0 the mContainerId of the fragment being removed, while on ICS it works correctly.
Any suggestions or workarounds?
推荐答案
我解决这个问题的方法是重新创建片段,同时保持它的状态:
My solution to this problem is to re-create the fragment while keeping its state:
FragmentTransaction ft = mFragmentManager.beginTransaction();
ft.remove(old);
Fragment newInstance = recreateFragment(old);
ft.add(R.id.new_container, newInstance);
ft.commit();
通过以下辅助函数:
With the following helper function:
private Fragment recreateFragment(Fragment f)
{
try {
Fragment.SavedState savedState = mFragmentManager.saveFragmentInstanceState(f);
Fragment newInstance = f.getClass().newInstance();
newInstance.setInitialSavedState(savedState);
return newInstance;
}
catch (Exception e) // InstantiationException, IllegalAccessException
{
throw new RuntimeException("Cannot reinstantiate fragment " + f.getClass().getName(), e);
}
}
这对我的作品,至少在最新的支持库(R11),虽然我没有测试很多呢。
It works for me, at least with the latest support library (r11), although I didn't test much yet.
额外的成本来实例化片段的两倍。
The extra cost is to instantiate the fragment twice.
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