Add getEsn().

Bug:27612001
Change-Id: I0cb61cd8a7604e2cc6959b181672fe63a1673447

telephony/java/android/telephony/TelephonyManager.java

@@ -5214,4 +5214,37 @@ public class TelephonyManager {
         return null;
     }
 
+    /**
+     * Return the Electronic Serial Number.
+     *
+     * Requires that the calling app has READ_PRIVILEGED_PHONE_STATE permission
+     *
+     * @return ESN or null if error.
+     * @hide
+     */
+    public String getEsn() {
+        return getEsn(getDefaultSubscription());
+    }
+
+    /**
+     * Return the Electronic Serial Number.
+     *
+     * Requires that the calling app has READ_PRIVILEGED_PHONE_STATE permission
+     *
+     * @param subId the subscription ID that this request applies to.
+     * @return ESN or null if error.
+     * @hide
+     */
+    public String getEsn(int subId) {
+        try {
+            ITelephony service = getITelephony();
+            if (service != null) {
+                return service.getEsn(subId);
+            }
+        } catch (RemoteException e) {
+            Log.e(TAG, "Error calling ITelephony#getEsn", e);
+        }
+        return null;
+    }
+
 }

telephony/java/com/android/internal/telephony/ITelephony.aidl

@@ -1076,4 +1076,15 @@ interface ITelephony {
      * @return Application ID for specificied app type or null if no uicc or error.
      */
     String getAidForAppType(int subId, int appType);
+
+    /**
+    * Return the Electronic Serial Number.
+    *
+    * Requires that the calling app has READ_PRIVILEGED_PHONE_STATE permission
+    *
+    * @param subId the subscription ID that this request applies to.
+    * @return ESN or null if error.
+    * @hide
+    */
+    String getEsn(int subId);
 }