Fragments in android

public class CheckActivity extends AppCompatActivity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_check);

        FragmentManager manager = getSupportFragmentManager();

        FragmentTransaction transaction  =manager.beginTransaction();

        CheckFragment fragment = new CheckFragment();

        transaction.add(R.id.frame,fragment);

        transaction.commit();

    }

}

public class CheckFragment extends Fragment {

    @Nullable

    @Override

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

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

        final Button mButton = (Button) view.findViewById(R.id.button9);

        mButton.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                startActivity(new Intent(getActivity(),NextActivity.class));

            }

        });

        return view;

    }

}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

        xmlns:tools="http://schemas.android.com/tools"

        android:id="@+id/activity_check"

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:paddingBottom="@dimen/activity_vertical_margin"

        android:paddingLeft="@dimen/activity_horizontal_margin"

        android:paddingRight="@dimen/activity_horizontal_margin"

        android:paddingTop="@dimen/activity_vertical_margin"

        tools:context="mycompany.com.saveme.activity.CheckActivity">

<FrameLayout

        android:id="@+id/frame"

                android:layout_width="match_parent"

                android:layout_height="match_parent">

</FrameLayout>

</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

        android:orientation="vertical" android:layout_width="match_parent"

        android:layout_height="match_parent">

<Button

        android:text="Go to activity"

                android:layout_width="match_parent"

                android:layout_height="wrap_content"

                android:id="@+id/button9" />

</LinearLayout>