Android: can't replace one fragment with another

Question

I need to replace a Fragment in one Activity with another Fragment, below is the layer file of the Activity:

<?xml version="1.0" encoding="utf-8"?>  <FrameLayout   xmlns:android="http://schemas.android.com/apk/res/android"   android:layout_width="fill_parent"   android:layout_height="fill_parent"   android:id="@+id/home_layout_container">      <fragment android:name="com.foo.FragA"         android:id="@+id/home_list"         android:layout_width="fill_parent"         android:layout_height="fill_parent" />      </FrameLayout> 

so by default there is FragA, now I want to replace it with FragB in activity, I did:

public void onRegionClicked(Region region) {     RegionInfoFragment rif = RegionInfoFragment.newInstance(region);     FragmentTransaction ft = getSupportFragmentManager().beginTransaction();     ft.replace(R.id.home_list, rif); } 

But I got exception:

>6:24:40.685: ERROR/AndroidRuntime(9194): Uncaught handler: thread main exiting due to uncaught exception 05-06 16:24:40.692: ERROR/AndroidRuntime(9194): java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first. 05-06 16:24:40.692: ERROR/AndroidRuntime(9194):     at android.view.ViewGroup.addViewInner(ViewGroup.java:1857) 05-06 16:24:40.692: ERROR/AndroidRuntime(9194):     at android.view.ViewGroup.addView(ViewGroup.java:1752) 05-06 16:24:40.692: ERROR/AndroidRuntime(9194):     at android.view.ViewGroup.addView(ViewGroup.java:1709) 05-06 16:24:40.692: ERROR/AndroidRuntime(9194):     at android.view.ViewGroup.addView(ViewGroup.java:1689) 05-06 16:24:40.692: ERROR/AndroidRuntime(9194):     at android.support.v4.app.NoSaveStateFrameLayout.wrap(NoSaveStateFrameLayout.java:40) 05-06 16:24:40.692: ERROR/AndroidRuntime(9194):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:743) 05-06 16:24:40.692: ERROR/AndroidRuntime(9194):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:933) 05-06 16:24:40.692: ERROR/AndroidRuntime(9194):     at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:578) 05-06 16:24:40.692: ERROR/AndroidRuntime(9194):     at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1219) 05-06 16:24:40.692: ERROR/AndroidRuntime(9194):     at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:380) 05-06 16:24:40.692: ERROR/AndroidRuntime(9194):     at android.os.Handler.handleCallback(Handler.java:587) 05-06 16:24:40.692: ERROR/AndroidRuntime(9194):     at android.os.Handler.dispatchMessage(Handler.java:92) 05-06 16:24:40.692: ERROR/AndroidRuntime(9194):     at android.os.Looper.loop(Looper.java:123) 05-06 16:24:40.692: ERROR/AndroidRuntime(9194):     at android.app.ActivityThread.main(ActivityThread.java:4363) 05-06 16:24:40.692: ERROR/AndroidRuntime(9194):     at java.lang.reflect.Method.invokeNative(Native Method) 05-06 16:24:40.692: ERROR/AndroidRuntime(9194):     at java.lang.reflect.Method.invoke(Method.java:521) 05-06 16:24:40.692: ERROR/AndroidRuntime(9194):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 05-06 16:24:40.692: ERROR/AndroidRuntime(9194):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 05-06 16:24:40.692: ERROR/AndroidRuntime(9194):     at dalvik.system.NativeStart.main(Native Method) 

What can I do?

Thanks!

Answer 1

You cannot replace a fragment defined statically in the layout file. You can only replace fragments that you added dynamically via a FragmentTransaction.