Hi,
I can't remove a Fragment that was added in an XML layout file, using
a FragmentTransaction. I don't understand why, I probably
misunderstood something and I would appreciate some explanations.
----
Here's a simple code to demonstrate my problem :
** Main layout, main.xml:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/
android"
android:orientation="vertical"
android:layout_width="fill_parent" android:layout_height="fill_parent"
android:id="@+id/root"
>
<TextView android:id="@+id/hello_view"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
<fragment android:name="test.fragments.FragmentA"
android:id="@+id/fragment_a"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>
** Main activity:
public class TestFragmentsActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
TextView helloView = (TextView)
findViewById(R.id.hello_view);
helloView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
FragmentManager fragmentManager =
getFragmentManager();
FragmentTransaction transaction =
fragmentManager.beginTransaction();
transaction.remove(fragmentManager.findFragmentById(R.id.fragment_a));
transaction.commit();
}
});
}
}
** My fragment class:
public class FragmentA extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup
container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.layout_a, container,
false);
}
}
** Fragment layout, layout_a.xml:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/
android" android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView android:text="TextView A" android:id="@+id/
textView1_a" android:layout_width="wrap_content"
android:layout_height="wrap_content"></TextView>
</LinearLayout>
----
When I click on the text view, the fragment should be removed, but
nothing seems to happen. If I click again, the application crashes
with the following error messages:
03-09 09:48:09.248: ERROR/AndroidRuntime(1222):
java.lang.NullPointerException
03-09 09:48:09.248: ERROR/AndroidRuntime(1222): at
android.app.BackStackRecord.remove(BackStackRecord.java:365)
03-09 09:48:09.248: ERROR/AndroidRuntime(1222): at
test.fragments.TestFragmentsActivity
$1.onClick(TestFragmentsActivity.java:28)
Maybe it's not possible to remove fragments that were added using XML
layouts?
Thanks in advance.
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