Merge "More descriptions on SubscriptionController#setPreferredData" am: 16fcd3dcff

am: 247f18f47a Change-Id: Id25f73dc5a0bd91c78f3822d31a6b37f7b488d5c
2018-10-09 11:54:25 -07:00
parent 846b2d1920 247f18f47a
commit 4b61b0bdf1
1 changed files with 6 additions and 1 deletions
--- a/telephony/java/android/telephony/SubscriptionManager.java
+++ b/telephony/java/android/telephony/SubscriptionManager.java
@@ -2159,7 +2159,12 @@ public class SubscriptionManager {

    /**
     * Set preferred default data.
-     * Set on which slot default data will be on.
+     * Set on which slot most cellular data will be on.
+     * It's also usually what we set up internet connection on.
+     *
+     * PreferredData overwrites user setting of default data subscription. And it's used
+     * by ANAS or carrier apps to switch primary and CBRS subscription dynamically in multi-SIM
+     * devices.
     *
     * @param slotId which slot is preferred to for cellular data.
     * @hide