[android-developers] Re: Honeycomb / Fragments: can't remove a fragment added in XML layout

I hope he was not still waiting for that answer.

On Tuesday, September 24, 2013 3:39:14 PM UTC+3, Adarsh Pandey wrote:

use

findViewById(R.id.fragment).setVisibility(View.GONE);

On Wednesday, March 9, 2011 3:34:31 PM UTC+5:30, clemp6r wrote:

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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