Question

Suppose I have several fragments:

public class FirstFragment extends Fragment { ... }

public class SecondFragment extends Fragment { ... }

public class ThirdFragment extends Fragment { ... }

I have also a main activity, its content is (main.xml):

<LinearLayout ...>

  <!-- How to have a fragment placehold without specify which fragment show here? -->
  <fragment>

</LinearLayout>

My question is, in above layout file, how can I define a fragment placeholder without specify which fragment show here, and then in My Activity java code, inflate a proper fragment to the placeholder ?

Is it possible and how to do it?

Answer 1

It is possible.
In your main.xml, define a place holder for the fragment, let’s call it “fragment_placeholder”:

<LinearLayout ...>
 <FrameLayout android:id="@+id/fragment_placeholder" android:layout_weight="1"
        android:layout_width="0px"
        android:layout_height="match_parent" />
</LinearLayout>

In your activity, whenever you want to load your fragment:

YourFragment fragment = new YourFragment();
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.replace(R.id.fragment_placeholder, fragment);
ft.commit();