Programmatically adding fragment to framelayout in android

Question

I am trying to build a UI combining both static and dynamic elements. For this, I have divided my activity into fragments - all app navigation is then done by replacing fragments instead of navigating between activities.

In my main activity layout, I am using a FrameLayout:

<FrameLayout         android:id="@+id/mainframe"         android:layout_height="match_parent"         android:layout_width="match_parent"         android:layout_below="@id/topsection"         android:layout_above="@id/lowersection" /> 

I have a fragment declared as such:

public class MyFragment extends Fragment {     @Override     public View onCreateView(LayoutInflater inflater, ViewGroup container,         Bundle savedInstanceState) {         // Inflate the layout for this fragment         return inflater.inflate(R.layout.fragmentlayout, container, false);     } } 

Then, in my main activity (which extends FragmentActivity and uses the import android.support.v4.app.FragmentActivity, I am attempting to load this fragment into the frame layout.

MyFragment myf = new MyFragment();  FragmentTransaction transaction = getFragmentManager().beginTransaction(); transaction.add(R.id.mainframe, myf); transaction.commit(); 

I have followed this from many other examples, however I am receiving a compiler error on the transaction.add() command, which nobody else seems to have encountered.

The error I am receiving is: The method add(int, Fragment) in the type FragmentTransaction is not applicable for the arguments (int, MyFragment).

Why is this? The MyFragment class extends Fragment so I would've thought this would work. What am I doing wrong?

Edit: The imports for my main activity are:

import org.joda.time.DateTime; import android.app.FragmentTransaction; import android.database.Cursor; import android.os.Bundle; import android.os.Handler; import android.support.v4.app.FragmentActivity; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.widget.TextView; import android.widget.Toast; 

Answer 1

Check your imports. Use android.support.v4.app.FragmentTransaction instead of android.app.FragmentTransaction.

Furthermore be sure you are using android.support.v4.app.Fragment and calling getSupportFragmentManager(). It's easy to miss this calls / imports. Thx to saiful103a with the hint of the FragmentManager.