Merge "add getPreferredDataSubId to SubscriptionManager and rename setPreferredData -> serPreferredDataSubId"
am: 396e01a168

Change-Id: I0fb8572c7a7c12aad124609dc62283061879afcf
diff --git a/telephony/java/android/telephony/PhoneStateListener.java b/telephony/java/android/telephony/PhoneStateListener.java
index a16d7eb..c816701 100644
--- a/telephony/java/android/telephony/PhoneStateListener.java
+++ b/telephony/java/android/telephony/PhoneStateListener.java
@@ -296,7 +296,7 @@
 
     /**
      *  Listen for changes to preferred data subId.
-     *  See {@link SubscriptionManager#setPreferredData(int)}
+     *  See {@link SubscriptionManager#setPreferredDataSubId(int)}
      *  for more details.
      *
      *  @see #onPreferredDataSubIdChanged
diff --git a/telephony/java/android/telephony/SubscriptionManager.java b/telephony/java/android/telephony/SubscriptionManager.java
index bb85fc2..ae50220 100644
--- a/telephony/java/android/telephony/SubscriptionManager.java
+++ b/telephony/java/android/telephony/SubscriptionManager.java
@@ -2439,10 +2439,39 @@
      *
      */
     @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE)
-    public void setPreferredData(int subId) {
-        if (VDBG) logd("[setPreferredData]+ subId:" + subId);
-        setSubscriptionPropertyHelper(SubscriptionManager.DEFAULT_SUBSCRIPTION_ID,
-                "setPreferredData", (iSub)-> iSub.setPreferredData(subId));
+    public void setPreferredDataSubscriptionId(int subId) {
+        if (VDBG) logd("[setPreferredDataSubscriptionId]+ subId:" + subId);
+        setSubscriptionPropertyHelper(DEFAULT_SUBSCRIPTION_ID, "setPreferredDataSubscriptionId",
+                (iSub)-> iSub.setPreferredDataSubscriptionId(subId));
+    }
+
+    /**
+     * Get which subscription is preferred for cellular data.
+     * It's also usually the subscription we set up internet connection on.
+     *
+     * PreferredData overwrites user setting of default data subscription. And it's used
+     * by AlternativeNetworkService or carrier apps to switch primary and CBRS
+     * subscription dynamically in multi-SIM devices.
+     *
+     * @return preferred subscription id for cellular data. {@link DEFAULT_SUBSCRIPTION_ID} if
+     * there's no prefered subscription.
+     *
+     * @hide
+     *
+     */
+    @RequiresPermission(Manifest.permission.READ_PRIVILEGED_PHONE_STATE)
+    public int getPreferredDataSubscriptionId() {
+        int preferredSubId = SubscriptionManager.DEFAULT_SUBSCRIPTION_ID;
+        try {
+            ISub iSub = ISub.Stub.asInterface(ServiceManager.getService("isub"));
+            if (iSub != null) {
+                preferredSubId = iSub.getPreferredDataSubscriptionId();
+            }
+        } catch (RemoteException ex) {
+            // ignore it
+        }
+
+        return preferredSubId;
     }
 
     /**
diff --git a/telephony/java/android/telephony/TelephonyManager.java b/telephony/java/android/telephony/TelephonyManager.java
index 621b8a6..98927f3 100644
--- a/telephony/java/android/telephony/TelephonyManager.java
+++ b/telephony/java/android/telephony/TelephonyManager.java
@@ -9738,10 +9738,11 @@
         try {
             IOns iOpportunisticNetworkService = getIOns();
             if (iOpportunisticNetworkService != null) {
-                return iOpportunisticNetworkService.setPreferredData(subId, pkgForDebug);
+                return iOpportunisticNetworkService
+                        .setPreferredDataSubscriptionId(subId, pkgForDebug);
             }
         } catch (RemoteException ex) {
-            Rlog.e(TAG, "setPreferredData RemoteException", ex);
+            Rlog.e(TAG, "setPreferredDataSubscriptionId RemoteException", ex);
         }
         return false;
     }
@@ -9762,10 +9763,10 @@
         try {
             IOns iOpportunisticNetworkService = getIOns();
             if (iOpportunisticNetworkService != null) {
-                subId = iOpportunisticNetworkService.getPreferredData(pkgForDebug);
+                subId = iOpportunisticNetworkService.getPreferredDataSubscriptionId(pkgForDebug);
             }
         } catch (RemoteException ex) {
-            Rlog.e(TAG, "getPreferredData RemoteException", ex);
+            Rlog.e(TAG, "getPreferredDataSubscriptionId RemoteException", ex);
         }
         return subId;
     }
diff --git a/telephony/java/com/android/internal/telephony/IOns.aidl b/telephony/java/com/android/internal/telephony/IOns.aidl
index d6779f1..0e3d12b 100755
--- a/telephony/java/com/android/internal/telephony/IOns.aidl
+++ b/telephony/java/com/android/internal/telephony/IOns.aidl
@@ -66,7 +66,7 @@
      * @return true if request is accepted, else false.
      *
      */
-    boolean setPreferredData(int subId, String callingPackage);
+    boolean setPreferredDataSubscriptionId(int subId, String callingPackage);
 
     /**
      * Get preferred opportunistic data subscription Id
@@ -78,7 +78,7 @@
      * subscription id
      *
      */
-    int getPreferredData(String callingPackage);
+    int getPreferredDataSubscriptionId(String callingPackage);
 
     /**
      * Update availability of a list of networks in the current location.
diff --git a/telephony/java/com/android/internal/telephony/ISub.aidl b/telephony/java/com/android/internal/telephony/ISub.aidl
index 88c7219..e8b350b 100755
--- a/telephony/java/com/android/internal/telephony/ISub.aidl
+++ b/telephony/java/com/android/internal/telephony/ISub.aidl
@@ -200,7 +200,15 @@
      * @hide
      *
      */
-    int setPreferredData(int subId);
+    int setPreferredDataSubscriptionId(int subId);
+
+    /**
+     * Get which subscription is preferred for cellular data.
+     *
+     * @hide
+     *
+     */
+    int getPreferredDataSubscriptionId();
 
     /**
      * Get User downloaded Profiles.