Using FragmentTransaction with a DialogFragment

Display a DialogFragment with commitAllowingStateLoss()

The DialogFragment.show(FragmentManager manager, String tag) doesn’t have an option to show the dialog while allowing state-loss. It’s a bit strange and inconsistent, because there is a DialogFragment.dismissAllowingStateLoss().

But you can always commit the DialogFragment transaction manually, or create a helper method like this:

public static void showDialogAllowingStateLoss(FragmentManager fragmentManager, DialogFragment dialogFragment, String tag) {
FragmentTransaction ft = fragmentManager.beginTransaction();
ft.add(dialogFragment, tag);
ft.commitAllowingStateLoss();
}

alexanderblom is right that DialogFragment acts as a Dialog, however it can be made to act as a Fragment with setShowsDialog(false);

In the end the following worked for me:

File: res/layout/wifidirect_dialog_wifidirect:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:id="@+id/dialog_wifidirect_layout">

    <LinearLayout
        android:id="@+id/frag_container"
        android:layout_width="match_parent"
        android:layout_height="250dp"
        android:orientation="vertical" >

            <!-- This is replaced during runtime -->
            <RelativeLayout
                android:id="@+id/frag_list"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:gravity="top" >
            </RelativeLayout>
    </LinearLayout>

    <!-- The Cancel Button -->
    <View
    android:layout_width="fill_parent"
    android:layout_height="1dp"
    android:layout_marginBottom="0dp"
    android:background="?android:attr/dividerVertical" />
    <Button
         android:id="@+id/dialog_wifidirect_cancel"
         style="?android:attr/buttonBarButtonStyle"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:text="@string/cancel"/>         
</LinearLayout>

File src/.../WifiDirectDialog.java:

public class WiFiDirectDialog extends DialogFragment  {
        public static final String TAG = "WifiDirectDialog";
        public static final String DEVICE_LIST_FRAGMENT_TAG = "WIFIDIRECT_DEVICE_LIST_FRAGMENT";


        public static WiFiDirectDialog newInstance(){                 
             WiFiDirectDialog wDialog = new WiFiDirectDialog();
             //We want this Dialog to be a Fragment in fact,
             //otherwise there are problems with showing another fragment, the DeviceListFragment
             wDialog.setShowsDialog(false);
             //wDialog.setStyle(SherlockDialogFragment.STYLE_NORMAL,android.R.style.Theme_Holo_Light_Dialog);
             //We don't want to recreate the instance every time user rotates the phone
             wDialog.setRetainInstance(true);
             //Don't close the dialog when touched outside
             wDialog.setCancelable(false);
             return wDialog;
        }


        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
            Log.v(TAG,"onCreateView");

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

            //Log.v(TAG,"FragmentTransaction started");            
            ListFragment listFragment = new YourListFragment();

            FragmentTransaction transaction = getChildFragmentManager().beginTransaction();
            transaction.addToBackStack(DEVICE_LIST_FRAGMENT_TAG)
                .replace(R.id.frag_list,deviceListFragment,DEVICE_LIST_FRAGMENT_TAG)
                .commit();
            //Log.v(TAG,"FragmentTransaction finished");

            return view;
        };

        @Override
        public void onActivityCreated(Bundle savedInstanceState){
            Log.v(TAG,"onActivityCreated");
            super.onActivityCreated(savedInstanceState);

            Dialog dialog = getDialog();
            dialog.setTitle(R.string.wifidirect_dialog_title);

            // Set button listeners etc...///
            Button cancelButton = (Button) view.findViewById(R.id.dialog_wifidirect_cancel);
            cancelButton.setOnClickListener(new View.OnClickListener() {
                public void onClick(View v) {                
                    dismiss();
                }
            });
        }

When a DialogFragment is shown as a Dialog it is not actually a real Fragment in a container view. It is a container-less Fragment which is basically a wrapper of a Dialog.

So no, you can not show a Fragment inside a FragmentDialog. If you really want to do this I think the best way would to create a new Activity styled as a Dialog which you can then add Fragments too.

there actualy is a container as you can see in the onCreateView method. You use the container to create your view.

    public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle icicle) {
    Log.d(TAG, "onCreateView");
    View v = inflater
            .inflate(R.layout.move_folder_dialog, container, false);

It seems like the FragmentManager is not able to get the container.

Could this be a bug?