CODEWITHSUNDEEP
androidandroid-fragments
Anass Boukalane
Anass Boukalane

Reputation: 549

Adding a fragment inside another fragment dynamically

i want add a fragment inside another one dynamically . the outer fragment is a DialogFragment :

public class MapFragmentDialog extends DialogFragment implements OnMapClickListener, OnMapLongClickListener,
    OnMarkerDragListener {

FragmentManager fmanager;
Fragment fragment;
SupportMapFragment supportmapfragment;

public static MapFragmentDialog newInstance() {
    MapFragmentDialog f = new MapFragmentDialog();
    return f;
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

    super.onCreateView(inflater, container, savedInstanceState);

    View v = inflater.inflate(R.layout.map_fragment, container, false);

    // *********** add myMapFragment

    FragmentManager fragmentManager = getActivity().getSupportFragmentManager();
    FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();

    // add a fragment
    MyMapFragment myFragment = new MyMapFragment();
    fragmentTransaction.add(R.id.myfragment, myFragment);
    fragmentTransaction.commit();
    myMap = ((SupportMapFragment)getActivity().getSupportFragmentManager().findFragmentById(R.id.myMap)).getMap();

    return v;
}

the map_fragment layout is like this :

<TextView
    android:id="@+id/txtHelp"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:gravity="center_vertical"
    android:paddingBottom="6dip"
    android:textAlignment="center"
    android:textAppearance="?android:attr/textAppearanceSmall"
    android:textSize="12sp" />
<FrameLayout
    android:id="@+id/myfragment"
    android:layout_width="0px"
    android:layout_height="wrap_content" />

my inner fragment MyMapFragment :

public class MyMapFragment extends Fragment {

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View myFragmentView = inflater.inflate(R.layout.my_map_fragment, container, false);
    return myFragmentView;
}}

the my_map_fragment layout contain :

<fragment
    android:id="@+id/myMap"
    android:layout_width="match_parent"
    android:layout_height="300dp"
    class="com.google.android.gms.maps.SupportMapFragment" />

i get an exception on getting the map fragment on my DialogFragment , a NullPointerException at this line 

myMap = ((SupportMapFragment)getActivity().getSupportFragmentManager().findFragmentById(R.id.myMap)).getMap();

Upvotes: 1

Views: 1148

Answers (2)

Sami Eltamawy
Sami Eltamawy

Reputation: 10009

To change the Fragments dynamically all what you need is

1) A FrameLayout in your Layout as following: 

<FrameLayout
android:id="@+id/fragment"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />

2) Initialize the FrameLayout into your activity as following:-

FrameLayout fragment = (FrameLayout) findViewById(R.id.fragment);

3) Start Fragment transaction as following:

getSupportFragmentManager().beginTransaction().replace(R.id.fragment, new MyFragment()).commit();

Or

FragmentManager fragMan = new FragmentManager();
fragMan.beginTransaction ();
fragMan.replace (R.id.fragment);
fragMan.commit ();

Upvotes: 1

Martin
Martin

Reputation: 4846

I remember seeing something about fragments in fragments working only dynamically and not by placing them XML. I think Abd El-Rahman El-Tama has the correct idea of using a frameLayout nstead of specifying a fragment directly

Upvotes: 2

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