Separate conversations from channels

Test: atest
Bug: 137397357
Change-Id: I15c360e8ef89f9fcb8db92678dd02a2c6fe083c5

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

@@ -0,0 +1,62 @@
+/*
+ * 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.util.Slog;
+
+import androidx.preference.Preference;
+
+import com.android.settings.core.PreferenceControllerMixin;
+import com.android.settings.notification.NotificationBackend;
+
+public class AddToHomeScreenPreferenceController extends NotificationPreferenceController
+        implements PreferenceControllerMixin {
+
+    private static final String TAG = "HomeScreenPref";
+    private static final String KEY = "add_to_home";
+
+    public AddToHomeScreenPreferenceController(Context context, NotificationBackend backend) {
+        super(context, backend);
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return KEY;
+    }
+
+    @Override
+    public boolean isAvailable() {
+        if (!super.isAvailable()) {
+            return false;
+        }
+        return mConversationInfo != null;
+    }
+
+    @Override
+    public boolean handlePreferenceTreeClick(Preference preference) {
+        if (KEY.equals(preference.getKey())) {
+            try {
+                mBackend.requestPinShortcut(mContext, mConversationInfo);
+                return true;
+            } catch (SecurityException e) {
+                Slog.e(TAG, "Cannot add to home screen", e);
+            }
+        }
+        return false;
+    }
+}