diff --git a/nfc/api/current.txt b/nfc/api/current.txt
index 1046d8e9..85d5b98 100644
--- a/nfc/api/current.txt
+++ b/nfc/api/current.txt
@@ -99,12 +99,12 @@
     field public static final String EXTRA_SECURE_ELEMENT_NAME = "android.nfc.extra.SECURE_ELEMENT_NAME";
     field public static final String EXTRA_TAG = "android.nfc.extra.TAG";
     field @FlaggedApi("android.nfc.enable_nfc_set_discovery_tech") public static final int FLAG_LISTEN_DISABLE = 0; // 0x0
-    field @FlaggedApi("android.nfc.enable_nfc_set_discovery_tech") public static final int FLAG_LISTEN_KEEP = -1; // 0xffffffff
+    field @FlaggedApi("android.nfc.enable_nfc_set_discovery_tech") public static final int FLAG_LISTEN_KEEP = -2147483648; // 0x80000000
     field @FlaggedApi("android.nfc.enable_nfc_set_discovery_tech") public static final int FLAG_LISTEN_NFC_PASSIVE_A = 1; // 0x1
     field @FlaggedApi("android.nfc.enable_nfc_set_discovery_tech") public static final int FLAG_LISTEN_NFC_PASSIVE_B = 2; // 0x2
     field @FlaggedApi("android.nfc.enable_nfc_set_discovery_tech") public static final int FLAG_LISTEN_NFC_PASSIVE_F = 4; // 0x4
     field @FlaggedApi("android.nfc.enable_nfc_set_discovery_tech") public static final int FLAG_READER_DISABLE = 0; // 0x0
-    field @FlaggedApi("android.nfc.enable_nfc_set_discovery_tech") public static final int FLAG_READER_KEEP = -1; // 0xffffffff
+    field @FlaggedApi("android.nfc.enable_nfc_set_discovery_tech") public static final int FLAG_READER_KEEP = -2147483648; // 0x80000000
     field public static final int FLAG_READER_NFC_A = 1; // 0x1
     field public static final int FLAG_READER_NFC_B = 2; // 0x2
     field public static final int FLAG_READER_NFC_BARCODE = 16; // 0x10
diff --git a/nfc/java/android/nfc/NfcAdapter.java b/nfc/java/android/nfc/NfcAdapter.java
index 11eb97b..5672724 100644
--- a/nfc/java/android/nfc/NfcAdapter.java
+++ b/nfc/java/android/nfc/NfcAdapter.java
@@ -416,18 +416,18 @@
     /**
      * Flags for use with {@link #setDiscoveryTechnology(Activity, int, int)}.
      * <p>
-     * Setting this flag makes listening to use current flags.
+     * Setting this flag makes listening to keep the current technology configuration.
      */
     @FlaggedApi(Flags.FLAG_ENABLE_NFC_SET_DISCOVERY_TECH)
-    public static final int FLAG_LISTEN_KEEP = -1;
+    public static final int FLAG_LISTEN_KEEP = 0x80000000;
 
     /**
      * Flags for use with {@link #setDiscoveryTechnology(Activity, int, int)}.
      * <p>
-     * Setting this flag makes polling to use current flags.
+     * Setting this flag makes polling to keep the current technology configuration.
      */
     @FlaggedApi(Flags.FLAG_ENABLE_NFC_SET_DISCOVERY_TECH)
-    public static final int FLAG_READER_KEEP = -1;
+    public static final int FLAG_READER_KEEP = 0x80000000;
 
     /** @hide */
     public static final int FLAG_USE_ALL_TECH = 0xff;
@@ -1799,6 +1799,8 @@
      *
      * Use {@link #FLAG_READER_KEEP} to keep current polling technology.
      * Use {@link #FLAG_LISTEN_KEEP} to keep current listenig technology.
+     * (if the _KEEP flag is specified the other technology flags shouldn't be set
+     * and are quietly ignored otherwise).
      * Use {@link #FLAG_READER_DISABLE} to disable polling.
      * Use {@link #FLAG_LISTEN_DISABLE} to disable listening.
      * Also refer to {@link #resetDiscoveryTechnology(Activity)} to restore these changes.
@@ -1830,6 +1832,15 @@
     @FlaggedApi(Flags.FLAG_ENABLE_NFC_SET_DISCOVERY_TECH)
     public void setDiscoveryTechnology(@NonNull Activity activity,
             @PollTechnology int pollTechnology, @ListenTechnology int listenTechnology) {
+
+        // A special treatment of the _KEEP flags
+        if ((listenTechnology & FLAG_LISTEN_KEEP) != 0) {
+            listenTechnology = -1;
+        }
+        if ((pollTechnology & FLAG_READER_KEEP) != 0) {
+            pollTechnology = -1;
+        }
+
         if (listenTechnology == FLAG_LISTEN_DISABLE) {
             synchronized (sLock) {
                 if (!sHasNfcFeature) {
@@ -1856,10 +1867,10 @@
     }
 
     /**
-     * Restore the poll/listen technologies of NFC controller,
+     * Restore the poll/listen technologies of NFC controller to its default state,
      * which were changed by {@link #setDiscoveryTechnology(Activity , int , int)}
      *
-     * @param activity The Activity that requests to changed technologies.
+     * @param activity The Activity that requested to change technologies.
      */
 
     @FlaggedApi(Flags.FLAG_ENABLE_NFC_SET_DISCOVERY_TECH)