How I use fragments

How I use fragments

/* My Fragment Class */
public class MainFragment extends Fragment {
    private View mainView;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle saveInstanceState){
        mainView = inflater.inflate(R.layout.fragment_main, container, false);

        mainView.setVisibility(View.GONE);

        return mainView;
    }
}


/* XML Layout */
<android.support.v4.widget.DrawerLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/drawerLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <FrameLayout
        android:id="@+id/mainFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</android.support.v4.widget.DrawerLayout>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="fragments.MainFragment">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/signed_in_message"/>

</RelativeLayout>


/* Switching out fragments */
public class FragmentHelper {
    private Intent intent;
    private FragmentManager fragmentManager;

    public FragmentHelper(Intent intent, FragmentManager fragmentManager){
        this.intent = intent;
        this.fragmentManager = fragmentManager;
    }

    public void switchFragment(Fragment fragment, int frameLayout){
        fragment.setArguments(this.intent.getExtras());

        this.fragmentManager.beginTransaction().replace(frameLayout, fragment).addToBackStack(null).commit();
    }
}



FragmentHelper fragmentHelper = new FragmentHelper(getIntent(), getSupportFragmentManager());
fragmentHelper.switchFragment(new SignInFragment(), R.id.mainFragment);