[Audiosharing] Add activity skeleton to handle new connected sink

Test: atest
Flag: com.android.settingslib.flags.promote_audio_sharing_for_second_auto_connected_lea_device
Bug: 395786392
Change-Id: Iff1378af8d9a8aa50ccd02b92630541acb24a1ad

src/com/android/settings/connecteddevice/audiosharing/AudioSharingJoinHandlerController.java

@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2025 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.connecteddevice.audiosharing;
+
+import android.content.Context;
+
+import androidx.annotation.NonNull;
+import androidx.lifecycle.DefaultLifecycleObserver;
+
+import com.android.settings.core.BasePreferenceController;
+import com.android.settingslib.bluetooth.BluetoothUtils;
+import com.android.settingslib.flags.Flags;
+
+public class AudioSharingJoinHandlerController extends BasePreferenceController
+        implements DefaultLifecycleObserver {
+    private static final String TAG = "AudioSharingJoinHandlerCtrl";
+    private static final String KEY = "audio_sharing_join_handler";
+
+    public AudioSharingJoinHandlerController(@NonNull Context context,
+            @NonNull String preferenceKey) {
+        super(context, preferenceKey);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return (Flags.promoteAudioSharingForSecondAutoConnectedLeaDevice()
+                && BluetoothUtils.isAudioSharingUIAvailable(mContext))
+                ? AVAILABLE_UNSEARCHABLE
+                : UNSUPPORTED_ON_DEVICE;
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return KEY;
+    }
+
+    @Override
+    public int getSliceHighlightMenuRes() {
+        return 0;
+    }
+}