IllegalStateException:片段已添加到 tabhost 片段中 [英] IllegalStateException: Fragment already added in the tabhost fragment

问题描述

FATAL EXCEPTION: main
Process: com.example.loan, PID: 24169
java.lang.IllegalStateException: Fragment already added: FormFragment{428f10c8 #1 id=0x7f050055 form}
    at android.support.v4.app.FragmentManagerImpl.addFragment(FragmentManager.java:1192)
    at android.support.v4.app.BackStackRecord.popFromBackStack(BackStackRecord.java:722)
    at android.support.v4.app.FragmentManagerImpl.popBackStackState(FragmentManager.java:1533)
    at android.support.v4.app.FragmentManagerImpl$2.run(FragmentManager.java:489)
    at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1484)
    at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:450)
    at android.os.Handler.handleCallback(Handler.java:733)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:136)
    at android.app.ActivityThread.main(ActivityThread.java:5068)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:792)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:608)
    at dalvik.system.NativeStart.main(Native Method)

所以，我有一个使用 tabhost 构建的 android 应用程序.一共三个tab，tab2里面有一个按钮，tab2里面有一个进行fragment事务的按钮(就是调用fragment活动中的函数)

So, I have an android app that build with the tabhost. There are three tabs in total, in the tab2, there is a button to make the fragment transaction in tab2 (which is calling the function in the fragment activity)

FragmentTransaction t = getSupportFragmentManager().beginTransaction();
        t.replace(R.id.realtabcontent, mFrag);
        t.addToBackStack(null);
        t.commit();

如果我这样运行会有异常:

There is exception if I run like this:

1. 在tab2里面，我按下按钮来改变片段
2. 转到其他标签(例如标签 1 或标签 3)
3. 按返回按钮
4. 抛出异常

如何解决这个问题?感谢帮助

How to fix that? Thanks for helping

推荐答案

当我们在关闭之前尝试添加相同的片段或 DialogFragment 两次时会发生这种情况，

This happens when we try to add same fragment or DialogFragment twice before dismissing,

只要打电话

if(mFragment.isAdded())
{
     return; //or return false/true, based on where you are calling from
}

话虽如此，我看不出有什么理由删除旧片段并再次添加相同的片段，因为我们可以通过简单地将参数传递给片段内的方法来更新 UI/数据

Having said that, I don't see any reason why to remove old fragment and add the same fragment again since we can update the UI/data by simply passing parameters to the method inside the fragment

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