Add @hide API to return whether a modem stack is enabled or not.

Bug: 129296702
Test: TelephonyManagerTestApp
Change-Id: I7ef4ad8322cf85e5a159363e90dde303ac7240de
Merged-In: I7ef4ad8322cf85e5a159363e90dde303ac7240de

telephony/java/android/telephony/TelephonyManager.java

@@ -10695,6 +10695,25 @@ public class TelephonyManager {
         return ret;
     }
 
+    /**
+     * It indicates whether modem is enabled or not per slot.
+     * It's the corresponding status of {@link #enableModemForSlot}.
+     *
+     * @param slotIndex which slot it's checking.
+     * @hide
+     */
+    public boolean isModemEnabledForSlot(int slotIndex) {
+        try {
+            ITelephony telephony = getITelephony();
+            if (telephony != null) {
+                return telephony.isModemEnabledForSlot(slotIndex, mContext.getOpPackageName());
+            }
+        } catch (RemoteException ex) {
+            Log.e(TAG, "enableModem RemoteException", ex);
+        }
+        return false;
+    }
+
     /**
      * Indicate if the user is allowed to use multiple SIM cards at the same time to register
      * on the network (e.g. Dual Standby or Dual Active) when the device supports it, or if the

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

@@ -1955,5 +1955,7 @@ interface ITelephony {
     /**
      * Get the IRadio HAL Version encoded as 100 * MAJOR_VERSION + MINOR_VERSION or -1 if unknown
      */
-     int getRadioHalVersion();
+    int getRadioHalVersion();
+
+    boolean isModemEnabledForSlot(int slotIndex, String callingPackage);
 }