Add WifiCallingScreen and corresponding TS flag

Bug: 372732219
Test: atest
Flag: com.android.settings.flags.catalyst_wifi_calling_settings

Change-Id: I3d78b6745e1127a0a7e73ec20ae95e9c9db2c139

src/com/android/settings/wifi/calling/WifiCallingScreen.kt

@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2024 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.wifi.calling
+
+import android.content.Context
+import com.android.settings.R
+import com.android.settings.flags.Flags
+import com.android.settingslib.metadata.ProvidePreferenceScreen
+import com.android.settingslib.metadata.preferenceHierarchy
+import com.android.settingslib.preference.PreferenceScreenCreator
+
+@ProvidePreferenceScreen
+class WifiCallingScreen : PreferenceScreenCreator {
+    override val key: String
+        get() = KEY
+
+    override val title: Int
+        get() = R.string.wifi_calling_settings_title
+
+    override val summary: Int
+        get() = R.string.wifi_calling_summary
+
+    override fun isFlagEnabled(context: Context) = Flags.catalystWifiCalling()
+
+    override fun fragmentClass() = WifiCallingSettingsForSub::class.java
+
+    override fun getPreferenceHierarchy(context: Context) = preferenceHierarchy(this) {}
+
+    companion object {
+        const val KEY = "wifi_calling"
+    }
+}

src/com/android/settings/wifi/calling/WifiCallingSettingsForSub.java

@@ -724,4 +724,9 @@ public class WifiCallingSettingsForSub extends DashboardFragment
 
         return mOverrideWfcRoamingModeWhileUsingNtn;
     }
+
+    @Override
+    public @Nullable String getPreferenceScreenBindingKey(@NonNull Context context) {
+        return WifiCallingScreen.KEY;
+    }
 }