Question

I have a main Activity and one fragment.

The main Activity has the following layout:

<FrameLayout
 ...>

 <LinearLayout
   android:id="@+id/header"
  .../>

 <com.project.fragments.FirstFragment
  .../>


</FrameLayout>

As the above layout shows, there is a <LinearLayout> with id “header“, and there is the FirstFragment which is part of the screen content. It works fine so far.

Then, I created another fragment class, called SecondFragment.java .

In my main activity java code, how can I dynamically switch the content between FirstFragment and SecondFragment meanwhile keep the <LinearLayout> (@+id/header) part stay on the screen?

(My app is running on a mobile phone not a tablet. Basically, I would like to have part of the screen content change by using fragments, but not sure how to achieve this.)

Answer 1

Here’s some template code for you to use:

Fragment newFragment = new SecondFragment();
FragmentTransaction transaction = getFragmentManager().beginTransaction();
transaction.replace(R.id.header, newFragment);
transaction.addToBackStack(null); // Ads FirstFragment to the back-stack
transaction.commit();