Question

Splash

I have main activity UI startup operations that take between 5-10 seconds (that need to be handled on the main UI thread) – so I would like to use a splash screen rather than the default black or non-responsive main UI.

A good solution to the splash screen is provided below

• which is to first set setContentView(R.layout.splash),
• then do the necessary main UI processing (on UI thread but with main view that is not visible)
• and when that is ready show setContentView(R.layout.main)

Android Splash Screen before black screen

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Splash with Fragments

I’m also using fragments, which normally require setContentView(R.layout.main) to be called before fragment instantiation – so that the fragment manager could find the view stubs in R.layout.main to inflate the fragments into (strictly speaking view stubs are a different thing).

• But I cannot call setContentView(R.layout.main) before creating the fragments, because that replaces the splash screen with the (not-yet-ready) main screen.
• My fear is that what I want to do cannot be done?
• Unfortunately, there is no overload like fragmentTransaction.add(viewNotViewId, fragment);

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Almost-Answer

Here’s all but the key, which is that setContentView is called before the fragment transactions:
How do I add a Fragment to an Activity with a programmatically created content view

Answer 1

You could try replacing your fragments in your FragmentActivity, here is the idea partially coded:
Suppose you have your fragments layout like this (main.xml):

<LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="horizontal">

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

    <!-- hidden layout -->
    <LinearLayout>
        <LinearLayout android:id="@+id/layout_list_items" ...>
        </LinearLayout>
        <LinearLayout android:id="@+id/layout_detail" ...>
        </LinearLayout>
    </LinearLayout>

</LinearLayout>

And your FragmentActivity like this:

public class FragmentsActivity extends FragmentActivity {

    @Override
    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.main);

        Fragment fragA = new WaitingTransaction();

        FragmentTransaction fragTrans = this.getSupportFragmentManager().beginTransaction();
        fragTrans.add(R.main.waiting, fragA);
        fragTrans.commit();
    }

    private void afterProcessing(){

                //show hidden layout and make the waiting hidden through visibility, then add the fragment bellow...
        FragmentTransaction fragTrans = this.getSupportFragmentManager().beginTransaction();
        fragTrans.add(R.main.layout_list_items,
                          new FragmentList());
        fragTrans.replace(R.main.layout_detail,
                          new FragmentB());
        fragTrans.commit();
    }

}