IllegalStateException:无法更改片段的容器ID
IllegalStateException:无法更改片段的容器ID
提问于 2012-03-28 19:09:14
Android平台: 3.1
我正在尝试将一个片段从容器A移动到容器B。下面是完成此操作的代码：
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();
}当我运行系统时，我得到以下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)经过快速调试，我注意到在Android3.1上，FragmentTransaction.remove没有将被移除的片段的mContainerId设置为0，而在ICS上它工作正常。
有什么建议或变通方法吗？
回答 7
Stack Overflow用户
发布于 2013-02-19 15:26:06
我对这个问题的解决方案是在保持片段状态的同时重新创建片段：
FragmentTransaction ft = mFragmentManager.beginTransaction();
ft.remove(old);
Fragment newInstance = recreateFragment(old);
ft.add(R.id.new_container, newInstance);
ft.commit();使用下面的helper函数：
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);
}
}它对我来说是有效的，至少对于最新的支持库(r11)是有效的，尽管我还没有测试太多。
额外的开销是将片段实例化两次。
Stack Overflow用户
发布于 2015-03-06 02:00:55
我遇到了类似的问题，在第二次添加片段之前调用manager.executePendingTransactions()为我解决了这个问题。谢谢!
Stack Overflow用户
发布于 2018-08-23 16:33:17
当多次尝试添加相同的fragment时，可能会发生这种情况。
public void populateFragments() {
Fragment fragment = new Fragment();
//fragment is added for the first time
addFragment(fragment);
// fragment is added for the second time
// This call will be responsible for the issue. The
addFragment(fragment);
}
public void addFragment(Fragment fragment) {
FrameLayout frameLayout = AppView.createFrameLayout(context);
view.addView(frameLayout);
getSupportFragmentManager().beginTransaction().add(frameLayout.getId(), fragment).commit();
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/9906254
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