[Settings] Initial config UI support for cross sim calling

This is the initial configuration UI support for cross SIM calling.

Mock UI: https://docs.google.com/presentation/d/1u9eO9Fs2_kr1mqkzyVe-_iNldM6OBv4ucmhUTr3Z-0w/edit?resourcekey=0-siV3RVBkI_fjH8mMWHbtHg#slide=id.gb4a3581a82_0_0
Screenshot: https://screenshot.googleplex.com/3QX3Y6vAhBYv7LC

Bug: 174012397
Test: manual
Change-Id: Id96b72054bee9b3359e5336cc90acbff7e6d78ea

res/values/strings.xml

@@ -12311,7 +12311,7 @@
     <string name="cross_sim_calling_settings_title">Cross SIM calling</string>
 
     <!-- Cross SIM calling summary.  [CHAR LIMIT=100] -->
-    <string name="cross_sim_calling_setting_summary">Allow another SIM calls and SMSs over this SIM.</string>
+    <string name="cross_sim_calling_setting_summary">Allow <xliff:g id="cross_sim_calling_operator_text" example="Google Fi">%1$s</xliff:g> call over the default data SIM when <xliff:g id="cross_sim_calling_carrier_text" example="Google Fi">%1$s</xliff:g> is unavailable.</string>
 
     <!-- List of synonyms for the cross SIM calling titles, used to match in settings search [CHAR LIMIT=NONE] -->
     <string name="keywords_cross_sim_calling">cross sim calling</string>

src/com/android/settings/network/telephony/CrossSimCallingPreferenceController.java

@@ -17,12 +17,32 @@
 package com.android.settings.network.telephony;
 
 import android.content.Context;
+import android.os.PersistableBundle;
+import android.telephony.CarrierConfigManager;
+import android.telephony.SubscriptionInfo;
+import android.telephony.SubscriptionManager;
+import android.telephony.ims.ImsException;
+import android.telephony.ims.ImsManager;
+import android.telephony.ims.ImsMmTelManager;
+import android.util.Log;
+
+import androidx.preference.Preference;
+import androidx.preference.SwitchPreference;
+
+import com.android.settings.R;
+
+import java.util.Objects;
 
 /**
  * Preference controller for "Cross SIM Calling"
  **/
 public class CrossSimCallingPreferenceController extends TelephonyTogglePreferenceController {
 
+    private static final String LOG_TAG = "CrossSimCallingPrefCtrl";
+
+    private int mSubId;
+    private Preference mPreference;
+
     /**
      * Class constructor of cross sim calling.
      *
@@ -40,26 +60,101 @@ public class CrossSimCallingPreferenceController extends TelephonyTogglePreferen
      * @return this instance after initialization
      **/
     public CrossSimCallingPreferenceController init(int subId) {
+        mSubId = subId;
         return this;
     }
 
     @Override
     public int getAvailabilityStatus(int subId) {
-        return CONDITIONALLY_UNAVAILABLE;
+        return hasCrossSimCallingFeature(subId) ? AVAILABLE : CONDITIONALLY_UNAVAILABLE;
     }
 
     /**
      * Implementation of abstract methods
      **/
     public boolean setChecked(boolean isChecked) {
-        return false;
+        ImsMmTelManager imsMmTelMgr = getImsMmTelManager();
+        if (imsMmTelMgr == null) {
+            return false;
+        }
+        try {
+            imsMmTelMgr.setCrossSimCallingEnabled(isChecked);
+        } catch (ImsException exception) {
+            Log.w(LOG_TAG, "fail to change cross SIM calling configuration: " + isChecked,
+                    exception);
+            return false;
+        }
+        return true;
     }
 
     /**
      * Implementation of abstract methods
      **/
     public boolean isChecked() {
+        ImsMmTelManager imsMmTelMgr = getImsMmTelManager();
+        if (imsMmTelMgr == null) {
+            return false;
+        }
+        try {
+            return imsMmTelMgr.isCrossSimCallingEnabledByUser();
+        } catch (ImsException exception) {
+            Log.w(LOG_TAG, "fail to get cross SIM calling configuration", exception);
+        }
         return false;
     }
 
+    @Override
+    public void updateState(Preference preference) {
+        super.updateState(preference);
+        if ((preference == null) || (!(preference instanceof SwitchPreference))) {
+            return;
+        }
+        mPreference = preference;
+
+        final SwitchPreference switchPreference = (SwitchPreference) preference;
+        switchPreference.setChecked(isChecked());
+
+        updateSummary(getLatestSummary());
+    }
+
+    private String getLatestSummary() {
+        SubscriptionInfo subInfo = getSubscriptionInfo();
+        return Objects.toString((subInfo == null) ? null : subInfo.getDisplayName(), "");
+    }
+
+    private void updateSummary(String displayName) {
+        Preference preference = mPreference;
+        if (preference == null) {
+            return;
+        }
+        String summary = displayName;
+        String finalText = String.format(
+                getResourcesForSubId().getString(R.string.cross_sim_calling_setting_summary),
+                summary)
+                .toString();
+        preference.setSummary(finalText);
+    }
+
+    private boolean hasCrossSimCallingFeature(int subscriptionId) {
+        PersistableBundle carrierConfig = getCarrierConfigForSubId(subscriptionId);
+        return (carrierConfig != null)
+                && carrierConfig.getBoolean(
+                CarrierConfigManager.KEY_CARRIER_CROSS_SIM_IMS_AVAILABLE_BOOL, false);
+    }
+
+    private ImsMmTelManager getImsMmTelManager() {
+        if (!SubscriptionManager.isUsableSubscriptionId(mSubId)) {
+            return null;
+        }
+        ImsManager imsMgr = mContext.getSystemService(ImsManager.class);
+        return (imsMgr == null) ? null : imsMgr.getImsMmTelManager(mSubId);
+    }
+
+    private SubscriptionInfo getSubscriptionInfo() {
+        SubscriptionManager subInfoMgr = mContext.getSystemService(SubscriptionManager.class);
+        if (subInfoMgr == null) {
+            return null;
+        }
+        return subInfoMgr.getActiveSubscriptionInfo(mSubId);
+    }
 }

src/com/android/settings/network/telephony/TelephonyTogglePreferenceController.java

@@ -17,6 +17,7 @@
 package com.android.settings.network.telephony;
 
 import android.content.Context;
+import android.content.res.Resources;
 import android.os.PersistableBundle;
 import android.telephony.CarrierConfigManager;
 import android.telephony.SubscriptionManager;
@@ -79,4 +80,13 @@ public abstract class TelephonyTogglePreferenceController extends TogglePreferen
                 mContext.getSystemService(CarrierConfigManager.class);
         return carrierConfigMgr.getConfigForSubId(subId);
     }
+
+    /**
+     * Returns the resources associated with Subscription.
+     *
+     * @return Resources associated with Subscription.
+     */
+    public Resources getResourcesForSubId() {
+        return SubscriptionManager.getResourcesForSubId(mContext, mSubId);
+    }
 }