Separate conversations from channels

Test: atest
Bug: 137397357
Change-Id: I15c360e8ef89f9fcb8db92678dd02a2c6fe083c5

src/com/android/settings/notification/app/ConversationDemotePreferenceController.java

@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2020 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.notification.app;
+
+import android.content.Context;
+import android.text.TextUtils;
+
+import androidx.preference.Preference;
+
+import com.android.settings.SettingsPreferenceFragment;
+import com.android.settings.core.PreferenceControllerMixin;
+import com.android.settings.notification.NotificationBackend;
+import com.android.settingslib.RestrictedSwitchPreference;
+
+public class ConversationDemotePreferenceController extends NotificationPreferenceController
+        implements PreferenceControllerMixin {
+
+    private static final String KEY = "demote";
+
+    SettingsPreferenceFragment mHostFragment;
+
+    public ConversationDemotePreferenceController(Context context,
+            SettingsPreferenceFragment hostFragment,
+            NotificationBackend backend) {
+        super(context, backend);
+        mHostFragment = hostFragment;
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return KEY;
+    }
+
+    @Override
+    public boolean isAvailable() {
+        if (!super.isAvailable()) {
+            return false;
+        }
+        if (mAppRow == null || mChannel == null) {
+            return false;
+        }
+        return !TextUtils.isEmpty(mChannel.getConversationId()) && !mChannel.isDemoted();
+    }
+
+    public void updateState(Preference preference) {
+        preference.setEnabled(mAdmin == null);
+    }
+
+    @Override
+    public boolean handlePreferenceTreeClick(Preference preference) {
+        if (KEY.equals(preference.getKey())) {
+            mChannel.setDemoted(true);
+            saveChannel();
+
+            mHostFragment.getActivity().finish();
+
+            return true;
+        }
+        return false;
+    }
+}