Do not load every DialtactsActivity fragment on app open

With this change we now only load the Favorites and Call Log Fragments when the
app opens.

Paging to the CallLogFragment makes the ContactsFragment load as we would want.

This should result in a faster app start time. I'll need to verify the impact
of this using the same method as http://cl/170422671

I verified the change in behavior by adding my own log line to the onCreate of each Fragment. I saw all of them get created before the change, and only the expected 2 with this change.

Bug: 64541209,65460373
Test: manual
PiperOrigin-RevId: 172154863
Change-Id: Iaf6e217df284e6df6f13688ac6aa677481a575e0

1 files changed, 5 insertions, 1 deletions

diff --git a/java/com/android/dialer/app/list/ListsFragment.java b/java/com/android/dialer/app/list/ListsFragment.java
index 362997a5a..05c647aec 100644
--- a/java/com/android/dialer/app/list/ListsFragment.java
+++ b/java/com/android/dialer/app/list/ListsFragment.java
@@ -203,7 +203,11 @@ public class ListsFragment extends Fragment implements OnPageChangeListener, Lis
             mPrefs.getBoolean(
                 VisualVoicemailEnabledChecker.PREF_KEY_HAS_ACTIVE_VOICEMAIL_PROVIDER, false));
     mViewPager.setAdapter(mAdapter);
-    mViewPager.setOffscreenPageLimit(DialtactsPagerAdapter.TAB_COUNT_WITH_VOICEMAIL - 1);
+
+    // This is deliberate. See cl/172018946 for the app startup implications of using 1 here
+    // versus loading more fragments upfront.
+    mViewPager.setOffscreenPageLimit(1);
+
     mViewPager.addOnPageChangeListener(this);
     showTab(DialtactsPagerAdapter.TAB_INDEX_SPEED_DIAL);