Make fingerprint registration flow full screen

Since the fingerprint registration sometimes has a hardware dependency,
to bring a better UX, make the flow full screen on large screen devices.

Bug: 197717071
Test: Try to register a new fingerprint and see the pages are full
screen.

Change-Id: I5dcb720a8b6a58bd9fc67ecae35f730c20a2c4d3

src/com/android/settings/activityembedding/ActivityEmbeddingRulesController.java

@@ -25,6 +25,7 @@ import android.util.Log;
 
 import androidx.annotation.NonNull;
 import androidx.window.embedding.ActivityFilter;
+import androidx.window.embedding.ActivityRule;
 import androidx.window.embedding.SplitController;
 import androidx.window.embedding.SplitPairFilter;
 import androidx.window.embedding.SplitPairRule;
@@ -33,6 +34,8 @@ import androidx.window.embedding.SplitRule;
 
 import com.android.settings.Settings;
 import com.android.settings.SubSettings;
+import com.android.settings.biometrics.fingerprint.FingerprintEnrollEnrolling;
+import com.android.settings.biometrics.fingerprint.FingerprintEnrollIntroduction;
 import com.android.settings.homepage.DeepLinkHomepageActivity;
 import com.android.settings.homepage.SettingsHomepageActivity;
 import com.android.settings.homepage.SliceDeepLinkHomepageActivity;
@@ -65,6 +68,8 @@ public class ActivityEmbeddingRulesController {
 
         // Set a placeholder for home page.
         registerHomepagePlaceholderRule();
+
+        registerAlwaysExpandRule();
     }
 
     /** Register a SplitPairRule for 2-pane. */
@@ -173,6 +178,13 @@ public class ActivityEmbeddingRulesController {
         mSplitController.registerRule(placeholderRule);
     }
 
+    private void registerAlwaysExpandRule() {
+        final Set<ActivityFilter> activityFilters = new HashSet<>();
+        addActivityFilter(activityFilters, FingerprintEnrollIntroduction.class);
+        addActivityFilter(activityFilters, FingerprintEnrollEnrolling.class);
+        mSplitController.registerRule(new ActivityRule(activityFilters, true /* alwaysExpand */));
+    }
+
     private void addActivityFilter(Set<ActivityFilter> activityFilters,
             Class<? extends Activity> activityClass) {
         activityFilters.add(new ActivityFilter(getComponentName(activityClass),