Fixed crash in UiListener when launching activity with screen off.

When launching MainActivity with the screen off (e.g. from Android Studio) the application would crash due to:

java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState

Also use FragmentPagerAdapter in MainPagerAdapter as the number of tabs is small and can be stored in memory.

Test: manual
PiperOrigin-RevId: 179734952
Change-Id: Ib2ca9674f3174493da55bbbf0ef4053fcf73ab47

3 files changed, 12 insertions, 6 deletions

diff --git a/java/com/android/dialer/calllog/ui/NewCallLogFragment.java b/java/com/android/dialer/calllog/ui/NewCallLogFragment.java
index c10b52123..719878cec 100644
--- a/java/com/android/dialer/calllog/ui/NewCallLogFragment.java
+++ b/java/com/android/dialer/calllog/ui/NewCallLogFragment.java
@@ -58,10 +58,10 @@ public final class NewCallLogFragment extends Fragment
   }
 
   @Override
-  public void onCreate(Bundle state) {
-    super.onCreate(state);
+  public void onActivityCreated(@Nullable Bundle savedInstanceState) {
+    super.onActivityCreated(savedInstanceState);
 
-    LogUtil.enterBlock("NewCallLogFragment.onCreate");
+    LogUtil.enterBlock("NewCallLogFragment.onActivityCreated");
 
     CallLogComponent component = CallLogComponent.get(getContext());
     CallLogFramework callLogFramework = component.callLogFramework();
diff --git a/java/com/android/dialer/common/concurrent/UiListener.java b/java/com/android/dialer/common/concurrent/UiListener.java
index 9541dbc0c..df791301f 100644
--- a/java/com/android/dialer/common/concurrent/UiListener.java
+++ b/java/com/android/dialer/common/concurrent/UiListener.java
@@ -71,7 +71,10 @@ public class UiListener<OutputT> extends Fragment {
     if (uiListener == null) {
       LogUtil.i("UiListener.create", "creating new UiListener for " + taskId);
       uiListener = new UiListener<>();
-      fragmentManager.beginTransaction().add(uiListener, taskId).commit();
+      // When launching an activity with the screen off, its onSaveInstanceState() is called before
+      // its fragments are created, which means we can't use commit() and need to use
+      // commitAllowingStateLoss(). This is not a problem for UiListener which saves no state.
+      fragmentManager.beginTransaction().add(uiListener, taskId).commitAllowingStateLoss();
     }
     return uiListener;
   }
@@ -130,6 +133,9 @@ public class UiListener<OutputT> extends Fragment {
   public void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     setRetainInstance(true);
+    // Note: We use commitAllowingStateLoss when attaching the fragment so it may not be safe to
+    // read savedInstanceState in all situations. (But it's not anticipated that this fragment
+    // should need to rely on saved state.)
   }
 
   @Override
diff --git a/java/com/android/dialer/main/impl/MainPagerAdapter.java b/java/com/android/dialer/main/impl/MainPagerAdapter.java
index 2d224f69c..d294640ee 100644
--- a/java/com/android/dialer/main/impl/MainPagerAdapter.java
+++ b/java/com/android/dialer/main/impl/MainPagerAdapter.java
@@ -20,7 +20,7 @@ import android.content.Context;
 import android.support.annotation.IntDef;
 import android.support.v4.app.Fragment;
 import android.support.v4.app.FragmentManager;
-import android.support.v4.app.FragmentStatePagerAdapter;
+import android.support.v4.app.FragmentPagerAdapter;
 import com.android.dialer.calllog.ui.NewCallLogFragment;
 import com.android.dialer.common.Assert;
 import com.android.dialer.voicemail.listui.NewVoicemailFragment;
@@ -28,7 +28,7 @@ import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 
 /** Adapter for {@link MainActivity} ViewPager. */
-final class MainPagerAdapter extends FragmentStatePagerAdapter {
+final class MainPagerAdapter extends FragmentPagerAdapter {
 
   @Retention(RetentionPolicy.SOURCE)
   @IntDef({