Recursive entry to executePendingTransactions

当Fragment和ViewPager一起交错使用时，出现以下异常：

Recursive entry to executePendingTransactions

 03-26 16:29:57.149: E/AndroidRuntime(2644): FATAL EXCEPTION: main
 03-26 16:29:57.149: E/AndroidRuntime(2644): java.lang.IllegalStateException: Recursive entry to executePendingTransactions
 03-26 16:29:57.149: E/AndroidRuntime(2644):     at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1416)
 03-26 16:29:57.149: E/AndroidRuntime(2644):     at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:461)
 03-26 16:29:57.149: E/AndroidRuntime(2644):     at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141)
 03-26 16:29:57.149: E/AndroidRuntime(2644):     at android.support.v4.view.ViewPager.populate(ViewPager.java:1011)
 03-26 16:29:57.149: E/AndroidRuntime(2644):     at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:522)
 03-26 16:29:57.149: E/AndroidRuntime(2644):     at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:494)
 03-26 16:29:57.149: E/AndroidRuntime(2644):     at android.support.v4.view.ViewPager.onRestoreInstanceState(ViewPager.java:1220)
 03-26 16:29:57.149: E/AndroidRuntime(2644):     at android.view.View.dispatchRestoreInstanceState(View.java:11910)
 03-26 16:29:57.149: E/AndroidRuntime(2644):     at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:2584)
 03-26 16:29:57.149: E/AndroidRuntime(2644):     at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:2590)
 03-26 16:29:57.149: E/AndroidRuntime(2644):     at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:2590)
 03-26 16:29:57.149: E/AndroidRuntime(2644):     at android.view.View.restoreHierarchyState(View.java:11888)
 03-26 16:29:57.149: E/AndroidRuntime(2644):     at android.support.v4.app.Fragment.restoreViewState(Fragment.java:417)
 03-26 16:29:57.149: E/AndroidRuntime(2644):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:933)
 03-26 16:29:57.149: E/AndroidRuntime(2644):     at android.support.v4.app.FragmentManagerImpl.attachFragment(FragmentManager.java:1264)
 03-26 16:29:57.149: E/AndroidRuntime(2644):     at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:672)
 03-26 16:29:57.149: E/AndroidRuntime(2644):     at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1444)
 03-26 16:29:57.149: E/AndroidRuntime(2644):     at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:429)
 03-26 16:29:57.149: E/AndroidRuntime(2644):     at android.os.Handler.handleCallback(Handler.java:615)
 03-26 16:29:57.149: E/AndroidRuntime(2644):     at android.os.Handler.dispatchMessage(Handler.java:92)
 03-26 16:29:57.149: E/AndroidRuntime(2644):     at android.os.Looper.loop(Looper.java:137)
 03-26 16:29:57.149: E/AndroidRuntime(2644):     at android.app.ActivityThread.main(ActivityThread.java:4745)
 03-26 16:29:57.149: E/AndroidRuntime(2644):     at java.lang.reflect.Method.invokeNative(Native Method)
 03-26 16:29:57.149: E/AndroidRuntime(2644):     at java.lang.reflect.Method.invoke(Method.java:511)
 03-26 16:29:57.149: E/AndroidRuntime(2644):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
 03-26 16:29:57.149: E/AndroidRuntime(2644):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
 03-26 16:29:57.149: E/AndroidRuntime(2644):     at dalvik.system.NativeStart.main(Native Method)

然后上网搜了下，有以下解决方法：

错误描述：ViewPager: Recursive entry to executePendingTransactions

错误产生：

在Fragment里面添加Viewpager，Viewpager由多个Fragment组成，在viewpager的setAdapter时产生错误

解决方案：

It can be done, but has be done through an Asysnc or a handler as you have to let the first fragments transaction complete first. You can have fragments within fragments. 

实例：

new Handler().postDelayed(new Runnable() {

@Override
public void run() {
// TODO Auto-generated method stub
adapter = new MainFragmentPagerAdapter(getFragmentManager(), fragments);
viewPager.setAdapter(adapter); 
switchPager(0);
}
}, 100);

}

但是试了下，发现效果并不理想，这样延时了viewPager的加载，导致滑动到某页面时，页面为空，需等待一段时间后再滑动回来才能正常显示，于是上StackOverFlow上看看，找到了最优解决方案：

New version of Support Library v4 (or Android 4.2, ofcourse) resolve this problem much simply. For do this, simply do constructor of your custom FragmentPagerAdapter like this:

 public CustomFragmentPagerAdapter(android.support.v4.app.Fragment fragment)
 {
     super(fragment.getChildFragmentManager());

     // write your code here
 }

This work because new Android version approve using nested Fragments.

于我而言，之前在构造方法里，super()参数是activity.getSupportFragmentManager()，如上，将其改为

getChildFragmentManager()即可。

需要注意的是：需要将v4包更新到最新版本，我的v4包以更新到版本12，已经解决上述问题！

希望能帮助到遇到此问题的朋友，对了，StackOverFlow上原文地址，有兴趣的朋友可以看看：

http://stackoverflow.com/questions/7338823/viewpager-recursive-entry-to-executependingtransactions