问题

I am using fragments, when I instantiate a fragment the first time it it. but the second time I got this exception. I couldn't find the line where I got the error?

04-04 08:51:54.320: E/AndroidRuntime(29713): FATAL EXCEPTION: main

04-04 08:51:54.320: E/AndroidRuntime(29713): java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.

04-04 08:51:54.320: E/AndroidRuntime(29713): at android.view.ViewGroup.addViewInner(ViewGroup.java:3013)

04-04 08:51:54.320: E/AndroidRuntime(29713): at android.view.ViewGroup.addView(ViewGroup.java:2902)

04-04 08:51:54.320: E/AndroidRuntime(29713): at android.view.ViewGroup.addView(ViewGroup.java:2859)

04-04 08:51:54.320: E/AndroidRuntime(29713): at android.view.ViewGroup.addView(ViewGroup.java:2839)

04-04 08:51:54.320: E/AndroidRuntime(29713): at android.support.v4.app.NoSaveStateFrameLayout.wrap(Unknown Source)

04-04 08:51:54.320: E/AndroidRuntime(29713): at android.support.v4.app.FragmentManagerImpl.moveToState(Unknown Source)

04-04 08:51:54.320: E/AndroidRuntime(29713): at android.support.v4.app.FragmentManagerImpl.moveToState(Unknown Source)

04-04 08:51:54.320: E/AndroidRuntime(29713): at android.support.v4.app.BackStackRecord.run(Unknown Source)

04-04 08:51:54.320: E/AndroidRuntime(29713): at android.support.v4.app.FragmentManagerImpl.execPendingActions(Unknown Source)

04-04 08:51:54.320: E/AndroidRuntime(29713): at android.support.v4.app.FragmentManagerImpl$1.run(Unknown Source)

04-04 08:51:54.320: E/AndroidRuntime(29713): at android.os.Handler.handleCallback(Handler.java:587)

04-04 08:51:54.320: E/AndroidRuntime(29713): at android.os.Handler.dispatchMessage(Handler.java:92)

04-04 08:51:54.320: E/AndroidRuntime(29713): at android.os.Looper.loop(Looper.java:132)

04-04 08:51:54.320: E/AndroidRuntime(29713): at android.app.ActivityThread.main(ActivityThread.java:4126)

04-04 08:51:54.320: E/AndroidRuntime(29713): at java.lang.reflect.Method.invokeNative(Native Method)

04-04 08:51:54.320: E/AndroidRuntime(29713): at java.lang.reflect.Method.invoke(Method.java:491)

04-04 08:51:54.320: E/AndroidRuntime(29713): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:844)

04-04 08:51:54.320: E/AndroidRuntime(29713): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602)

04-04 08:51:54.320: E/AndroidRuntime(29713): at dalvik.system.NativeStart.main(Native Method)

Here are what i do when i click on an element of my list fragment.

// If we are not currently showing a fragment for the new

// position, we need to create and install a new one.

RouteSearchFragment df = RouteSearchFragment.newInstance(index);

// Execute a transaction, replacing any existing fragment

// with this one inside the frame.

FragmentTransaction ft = fragmentManager.beginTransaction();

ft.replace(R.id.details_full, df);

ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);

ft.commit();

The first time it is Ok, I click element2 from list, it's also ok; but when I return to element1 I got this bug.

Thanks every one!

回答1:

When you override OnCreateView in your RouteSearchFragment class, do you have the

if(view != null) {

return view;

}

code segment?

If so, removing the return statement should solve your problem.

You can keep the code and return the view if you don't want to regenerate view data, and onDestroyView() method you remove this view from its parent like so:

@Override

public void onDestroyView() {

super.onDestroyView();

if (view != null) {

ViewGroup parent = (ViewGroup) view.getParent();

if (parent != null) {

parent.removeAllViews();

}

}

}

回答2:

Sorry to post to an old question but I was able to fix it using a totally different solution. I was getting this exception but I changed the first line of my onCreatView override from this:

View result = inflater.inflate(R.layout.customer_layout, container);

...to this:

View result = inflater.inflate(R.layout.customer_layout, container, false);

I have no idea why but using the override that accepts the boolean as the third param fixed it. I think it tells the Fragment and/or Activity not to use the "container" as the parent of the newly-created View.

回答3:

I have facing this issue many time.

Please add following code for resolve this issue :

@Override

public void onDestroyView() {

super.onDestroyView();

if (view != null) {

ViewGroup parentViewGroup = (ViewGroup) view.getParent();

if (parentViewGroup != null) {

parentViewGroup.removeAllViews();

}

}

}

Thanks

回答4:

If you have this statement..

View view = inflater.inflate(R.layout.fragment1, container);//may be Incorrect

Then try this.. Add false as third argument.. May be it could help..

View view = inflater.inflate(R.layout.fragment1, container, false);//correct one

回答5:

I had this code in a fragment and it was crashing if I try to come back to this fragment

if (mRootView == null) {

mRootView = inflater.inflate(R.layout.fragment_main, container, false);

}

after gathering the answers on this thread, I realised that mRootView's parent still have mRootView as child. So, this was my fix.

if (mRootView == null) {

mRootView = inflater.inflate(R.layout.fragment_main, container, false);

} else {

((ViewGroup) mRootView.getParent()).removeView(mRootView);

}

hope this helps

回答6:

It also happens when the view returned by onCreateView() isn't the view that was inflated.

Example:

View rootView = inflater.inflate(R.layout.my_fragment, container, false);

TextView textView = (TextView) rootView.findViewById(R.id.text_view);

textView.setText("Some text.");

return textView;

Fix:

return rootView;

Instead of:

return textView; // or whatever you returned

回答7:

I had this problem and couldn't solve it in Java code. The problem was with my xml.

I was trying to add a textView to a container, but had wrapped the textView inside a LinearLayout.

This was the original xml file:

android:orientation="vertical"

android:layout_width="match_parent"

android:layout_height="match_parent">

android:id="@android:id/text1"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:textAppearance="?android:attr/textAppearanceListItemSmall"

android:gravity="center_vertical"

android:paddingLeft="16dp"

android:paddingRight="16dp"

android:textColor="#fff"

android:background="?android:attr/activatedBackgroundIndicator"

android:minHeight="?android:attr/listPreferredItemHeightSmall"/>

Now with the LinearLayout removed:

android:id="@android:id/text1"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:textAppearance="?android:attr/textAppearanceListItemSmall"

android:gravity="center_vertical"

android:paddingLeft="16dp"

android:paddingRight="16dp"

android:textColor="#fff"

android:background="?android:attr/activatedBackgroundIndicator"

android:minHeight="?android:attr/listPreferredItemHeightSmall"/>

This didn't seem like much to me but it did the trick, and I didn't change my Java code at all. It was all in the xml.

回答8:

You are adding a View into a layout, but the View already is in another layout. A View can't be in more than one place.

回答9:

This solution can help :

public class FragmentItem extends Android.Support.V4.App.Fragment

{

View rootView;

TextView textView;

public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

if (rootView != null)

{

ViewGroup parent = (ViewGroup)rootView.Parent;

parent.RemoveView(rootView);

} else {

rootView = inflater.Inflate(Resource.Layout.FragmentItem, container, false);

textView = rootView.FindViewById(Resource.Id.textViewDisplay);

}

return rootView;

}

}

回答10:

I solved it by setting attachToRoot of inflater.inflate() to false.

public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

View view = inflater.inflate(R.layout.fragment_overview, container, false);

return view;

}

回答11:

in your xml file you should set layout_width and layout_height from wrap_content to match_parent. it's fixed for me.

android:id="@+id/container"

android:layout_width="match_parent"

android:layout_height="match_parent" />

来源：https://stackoverflow.com/questions/10007094/java-lang-illegalstateexception-the-specified-child-already-has-a-parent