Add new TelecomManager method to check if a self-mgd app is in a call.

Adding a new method which NotificationManager will use to check if a
VOIP app is currently engaged in any self-managed calls.  Structured to
accept a package name and userhandle rather than a PhoneAccountHandle so
that NotificationManager doesn't need to query all phone account handles
to find the right one to pass in.

NotificationMgr is part of the system service, so this @hide method is
sufficient.  We can consider making this a system API in the future
when we mainline Telecom.

Test: Manual test with Telecom test app to validate method behavior.
Test: Added new unit test to exercise backing functionality for new method.
Bug: 226959797
Change-Id: I74c0568ad2ec308fe50cada7315e3a677363cccc

telecomm/java/android/telecom/TelecomManager.java

@@ -2600,6 +2600,33 @@ public class TelecomManager {
         return false;
     }
 
+    /**
+     * Determines whether there are any ongoing {@link PhoneAccount#CAPABILITY_SELF_MANAGED}
+     * calls for a given {@code packageName} and {@code userHandle}.
+     *
+     * @param packageName the package name of the app to check calls for.
+     * @param userHandle the user handle on which to check for calls.
+     * @return {@code true} if there are ongoing calls, {@code false} otherwise.
+     * @hide
+     */
+    @RequiresPermission(android.Manifest.permission.READ_PRIVILEGED_PHONE_STATE)
+    public boolean isInSelfManagedCall(@NonNull String packageName,
+            @NonNull UserHandle userHandle) {
+        ITelecomService service = getTelecomService();
+        if (service != null) {
+            try {
+                return service.isInSelfManagedCall(packageName, userHandle,
+                        mContext.getOpPackageName());
+            } catch (RemoteException e) {
+                Log.e(TAG, "RemoteException isInSelfManagedCall: " + e);
+                e.rethrowFromSystemServer();
+                return false;
+            }
+        } else {
+            throw new IllegalStateException("Telecom service is not present");
+        }
+    }
+
     /**
      * Handles {@link Intent#ACTION_CALL} intents trampolined from UserCallActivity.
      * @param intent The {@link Intent#ACTION_CALL} intent to handle.

telecomm/java/com/android/internal/telecom/ITelecomService.aidl

@@ -22,6 +22,7 @@ import android.telecom.TelecomAnalytics;
 import android.telecom.PhoneAccountHandle;
 import android.net.Uri;
 import android.os.Bundle;
+import android.os.UserHandle;
 import android.telecom.PhoneAccount;
 
 /**
@@ -374,4 +375,10 @@ interface ITelecomService {
      * @see TelecomServiceImpl#setTestCallDiagnosticService
      */
     void setTestCallDiagnosticService(in String packageName);
+
+    /**
+     * @see TelecomServiceImpl#isInSelfManagedCall
+     */
+    boolean isInSelfManagedCall(String packageName, in UserHandle userHandle,
+        String callingPackage);
 }