hzxu hzxu - 21 days ago 6
Android Question

Android: can't replace one fragment with another

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

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