IllegalStateException异常：片段已经添加如果出现一个应用程序是很长的背景 [英] IllegalStateException: Fragment already added appears if a App was very long in the background

问题描述

您好，我使用片段在我的Andr​​oid应用程序，但我看到一些奇怪的例外 java.lang.IllegalStateException：已添加的片段如果出现一个应用程序是很长的背景。

Hello I am using fragment in my android application but I see some strange exception java.lang.IllegalStateException: Fragment already added appears if a App was very long in the background.

我检查这个 https：//开头code .google.com / p /安卓/问题/细节？ID = 61247 ，<一个href=\"http://stackoverflow.com/questions/19441932/java-lang-illegalstateexception-fragment-already-added\">java.lang.IllegalStateException:片段已经添加但如何我可以检查是否片段的情况下，已经添加，当我在 FragmentTabHost 片段 C $ C>

I checked this https://code.google.com/p/android/issues/detail?id=61247, java.lang.IllegalStateException: Fragment already added but how this I can check whether fragment is already added in case when I add the fragment in the FragmentTabHost

来源$ C ​​$ C：

Source Code :

public class FirstFragment extends SherlockFragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        mTabHost = new FragmentTabHost(getSherlockActivity());

        mTabHost.setup(getSherlockActivity(), getChildFragmentManager(),
                R.layout.registration);

        // Create Child Tab1
        mTabHost.addTab(mTabHost.newTabSpec("child1").setIndicator("Registration"),
                RegistrationFragment.class, null);
    }

}

堆栈跟踪

java.lang.IllegalStateException: Fragment already added: RegistrationFragment{424d19f8 #0 id=0x7f0600b8 child1 }
at android.support.v4.app.FragmentManagerImpl.addFragment(FragmentManager.java:1175)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:616)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1460)
at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:556)
at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1171)
at android.app.Activity.performStart(Activity.java:5143)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2184)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
at android.app.ActivityThread.access$600(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5103)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)

先谢谢了。

推荐答案

检查片段加入之前就已经存在了：

Check if the fragment already exists before adding :

Fragment f = mManager.findFragmentById(R.id.fragment_id);
if(f != null && f instanceof FragmentClassName) {
   //Fragment already exists
} else {
   //Add Fragment
}

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