ECBM SystemProperty cleanup

- Add getEmergencyCallbackMode() method in the TelephonyManager.java
to get the boolean value for ECBM callback mode from the phone through
ITelephony.aidl/java interface

- Use the added TelephonyManager Api to replace the 'get' of
PROPERTY_INECM_MODE system property in the framework/base

Test: manual
Bug: 30361624

Change-Id: I355d69820b157f23e077a95a13f8509ee0fa5874

location/java/com/android/internal/location/GpsNetInitiatedHandler.java

@@ -245,8 +245,7 @@ public class GpsNetInitiatedHandler {
     }
 
     public boolean getInEmergency() {
-        boolean isInEmergencyCallback = Boolean.parseBoolean(
-                SystemProperties.get(TelephonyProperties.PROPERTY_INECM_MODE));
+        boolean isInEmergencyCallback = mTelephonyManager.getEmergencyCallbackMode();
         return mIsInEmergency || isInEmergencyCallback;
     }
 

telephony/java/android/telephony/TelephonyManager.java

@@ -6150,5 +6150,33 @@ public class TelephonyManager {
 
         return null;
     }
+
+    /**
+     * Check if phone is in emergency callback mode
+     * @return true if phone is in emergency callback mode
+     * @hide
+     */
+    public boolean getEmergencyCallbackMode() {
+        return getEmergencyCallbackMode(getSubId());
+    }
+
+    /**
+     * Check if phone is in emergency callback mode
+     * @return true if phone is in emergency callback mode
+     * @param subId the subscription ID that this action applies to.
+     * @hide
+     */
+    public boolean getEmergencyCallbackMode(int subId) {
+        try {
+            ITelephony telephony = getITelephony();
+            if (telephony == null) {
+                return false;
+            }
+            return telephony.getEmergencyCallbackMode(subId);
+        } catch (RemoteException e) {
+            Log.e(TAG, "Error calling ITelephony#getEmergencyCallbackMode", e);
+        }
+        return false;
+    }
 }
 

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

@@ -1256,4 +1256,12 @@ interface ITelephony {
      * @param appType the icc application type, like {@link #APPTYPE_USIM}
      */
     String[] getForbiddenPlmns(int subId, int appType);
+
+    /**
+     * Check if phone is in emergency callback mode
+     * @return true if phone is in emergency callback mode
+     * @param subId the subscription ID that this action applies to.
+     * @hide
+     */
+    boolean getEmergencyCallbackMode(int subId);
 }