Add method to retrieve whether observe mode is currently enabled or not

Bug: b/322604034
Test: Tested with new CTS test
Change-Id: I9439d67afc5dc4cf050b4858d4257f77961b2b0d

nfc/api/current.txt

diff --git a/nfc/api/current.txt b/nfc/api/current.txt
index 9f94ef9..28cf250 100644
--- a/nfc/api/current.txt
+++ b/nfc/api/current.txt
@@ -73,6 +73,7 @@
     method @FlaggedApi("android.nfc.enable_nfc_charging") @Nullable public android.nfc.WlcListenerDeviceInfo getWlcListenerDeviceInfo();
     method public boolean ignore(android.nfc.Tag, int, android.nfc.NfcAdapter.OnTagRemovedListener, android.os.Handler);
     method public boolean isEnabled();
+    method @FlaggedApi("android.nfc.nfc_observe_mode") public boolean isObserveModeEnabled();
     method @FlaggedApi("android.nfc.nfc_observe_mode") public boolean isObserveModeSupported();
     method @FlaggedApi("android.nfc.enable_nfc_reader_option") public boolean isReaderOptionEnabled();
     method @FlaggedApi("android.nfc.enable_nfc_reader_option") public boolean isReaderOptionSupported();

nfc/java/android/nfc/INfcAdapter.aidl

diff --git a/nfc/java/android/nfc/INfcAdapter.aidl b/nfc/java/android/nfc/INfcAdapter.aidl
index 293e5d1..c444740 100644
--- a/nfc/java/android/nfc/INfcAdapter.aidl
+++ b/nfc/java/android/nfc/INfcAdapter.aidl
@@ -88,6 +88,7 @@
     @JavaPassthrough(annotation="@android.annotation.RequiresPermission(android.Manifest.permission.WRITE_SECURE_SETTINGS)")
     boolean enableReaderOption(boolean enable);
     boolean isObserveModeSupported();
+    boolean isObserveModeEnabled();
     boolean setObserveMode(boolean enabled);
 
     @JavaPassthrough(annotation="@android.annotation.RequiresPermission(android.Manifest.permission.WRITE_SECURE_SETTINGS)")

nfc/java/android/nfc/NfcAdapter.java

diff --git a/nfc/java/android/nfc/NfcAdapter.java b/nfc/java/android/nfc/NfcAdapter.java
index 3d74980..782af5f 100644
--- a/nfc/java/android/nfc/NfcAdapter.java
+++ b/nfc/java/android/nfc/NfcAdapter.java
@@ -1208,6 +1208,22 @@
     }
 
     /**
+     * Returns whether Observe Mode is currently enabled or not.
+     *
+     * @return true if observe mode is enabled, false otherwise.
+     */
+
+    @FlaggedApi(Flags.FLAG_NFC_OBSERVE_MODE)
+    public boolean isObserveModeEnabled() {
+        try {
+            return sService.isObserveModeEnabled();
+        } catch (RemoteException e) {
+            attemptDeadServiceRecovery(e);
+            return false;
+        }
+    }
+
+    /**
      * Controls whether the NFC adapter will allow transactions to proceed or be in observe mode
      * and simply observe and notify the APDU service of polling loop frames. See
      * {@link #isObserveModeSupported()} for a description of observe mode.