Dynamic advanced button for about phone v2

- Set the number of tiles for the advanced button based on the device's
 sim count

Bug: 36458278
Test: make RunSettingsRoboTests -j40
Change-Id: I86a5e95476eb93a94607e8c379b132a80a5a1fc5

src/com/android/settings/DeviceInfoSettings.java

@@ -22,8 +22,11 @@ import android.app.Activity;
 import android.app.Fragment;
 import android.content.Context;
 import android.content.Intent;
+import android.os.Bundle;
 import android.provider.SearchIndexableResource;
+import android.telephony.TelephonyManager;
 import android.util.FeatureFlagUtils;
+import android.support.annotation.VisibleForTesting;
 
 import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
 import com.android.settings.dashboard.DashboardFragment;
@@ -61,6 +64,11 @@ public class DeviceInfoSettings extends DashboardFragment implements Indexable {
 
     private static final String KEY_LEGAL_CONTAINER = "legal_container";
 
+    @VisibleForTesting
+    static final int SIM_PREFERENCES_COUNT = 3;
+    @VisibleForTesting
+    static final int NON_SIM_PREFERENCES_COUNT = 2;
+
     @Override
     public int getMetricsCategory() {
         return MetricsEvent.DEVICEINFO;
@@ -71,6 +79,21 @@ public class DeviceInfoSettings extends DashboardFragment implements Indexable {
         return R.string.help_uri_about;
     }
 
+    @Override
+    public void onCreate(Bundle icicle) {
+        super.onCreate(icicle);
+
+        if (FeatureFlagUtils.isEnabled(getContext(), DEVICE_INFO_V2)) {
+            // Increase the number of children when the device contains more than 1 sim.
+            final TelephonyManager telephonyManager = (TelephonyManager) getSystemService(
+                    Context.TELEPHONY_SERVICE);
+            final int numberOfChildren = Math.max(SIM_PREFERENCES_COUNT,
+                    SIM_PREFERENCES_COUNT * telephonyManager.getPhoneCount())
+                    + NON_SIM_PREFERENCES_COUNT;
+            getPreferenceScreen().setInitialExpandedChildrenCount(numberOfChildren);
+        }
+    }
+
     @Override
     public void onActivityResult(int requestCode, int resultCode, Intent data) {
         final BuildNumberPreferenceController buildNumberPreferenceController =