Mark EXTRA_PLAY_CALL_RECORDING_TONE as deprecated.

This constant was never actually used and serves no purpose any more.
This was used to detect apps that tried to record a call by recording the
device mic hoping to pick up the call audio from the earpiece.  This is
no longer allowed by audio policies.   This extra was set based on a
carrier config key that was never actually used by any carriers anyways.
Removing to clean up dead/useless code.

Flag: com.android.server.telecom.flags.telecom_resolve_hidden_dependencies
Test: Run unit/cts tests.
Bug: 308017600
Change-Id: Id43b8fcffa7c98b8b907116b54acd693ecbcd4e7

3 files changed, 9 insertions, 1 deletions

diff --git a/core/api/system-current.txt b/core/api/system-current.txt
index 15e5706db9d1..2a9060f8facd 100644
--- a/core/api/system-current.txt
+++ b/core/api/system-current.txt
@@ -14196,7 +14196,7 @@ package android.telecom {
     field public static final int CAPABILITY_EMERGENCY_PREFERRED = 8192; // 0x2000
     field public static final int CAPABILITY_EMERGENCY_VIDEO_CALLING = 512; // 0x200
     field public static final int CAPABILITY_MULTI_USER = 32; // 0x20
-    field public static final String EXTRA_PLAY_CALL_RECORDING_TONE = "android.telecom.extra.PLAY_CALL_RECORDING_TONE";
+    field @Deprecated @FlaggedApi("com.android.server.telecom.flags.telecom_resolve_hidden_dependencies") public static final String EXTRA_PLAY_CALL_RECORDING_TONE = "android.telecom.extra.PLAY_CALL_RECORDING_TONE";
     field @FlaggedApi("com.android.server.telecom.flags.telecom_resolve_hidden_dependencies") public static final String EXTRA_SKIP_CALL_FILTERING = "android.telecom.extra.SKIP_CALL_FILTERING";
     field public static final String EXTRA_SORT_ORDER = "android.telecom.extra.SORT_ORDER";
   }
diff --git a/telecomm/java/android/telecom/PhoneAccount.java b/telecomm/java/android/telecom/PhoneAccount.java
index e6fe406dd8e5..83dac184fc5f 100644
--- a/telecomm/java/android/telecom/PhoneAccount.java
+++ b/telecomm/java/android/telecom/PhoneAccount.java
@@ -175,8 +175,15 @@ public final class PhoneAccount implements Parcelable {
      * <p>
      * The call recording tone is a 1400 hz tone which repeats every 15 seconds while recording is
      * in progress.
+     *
+     * @deprecated this API was only intended to prevent call recording via the microphone by an app
+     * while in a phone call.  Audio policies no longer make this possible.  Further, this API was
+     * never actually used.  Call recording solutions integrated in an OEM dialer app must use
+     * appropriate recording signals to inform the caller/callee of the recording.
      * @hide
      */
+    @FlaggedApi(com.android.server.telecom.flags.Flags.FLAG_TELECOM_RESOLVE_HIDDEN_DEPENDENCIES)
+    @Deprecated
     @SystemApi
     public static final String EXTRA_PLAY_CALL_RECORDING_TONE =
             "android.telecom.extra.PLAY_CALL_RECORDING_TONE";
diff --git a/telephony/java/android/telephony/CarrierConfigManager.java b/telephony/java/android/telephony/CarrierConfigManager.java
index b9a001d1f2b6..48f5d69b6371 100644
--- a/telephony/java/android/telephony/CarrierConfigManager.java
+++ b/telephony/java/android/telephony/CarrierConfigManager.java
@@ -420,6 +420,7 @@ public class CarrierConfigManager {
      * <p>
      * Note: This requires the Telephony config_supports_telephony_audio_device overlay to be true
      * in order to work.
+     * @deprecated this functionality was never used and is no longer supported.
      * @hide
      */
     public static final String KEY_PLAY_CALL_RECORDING_TONE_BOOL = "play_call_recording_tone_bool";