Experiment: hide unused channels in settings

behind a 3-dot menu. "unused" in this case means a channel that is not blocked but also hasn't sent a notification in the last 2 weeks

Test: manual
Flag: com.android.server.notification.notification_hide_unused_channels
Bug: 322536537
Change-Id: I99f5a61411c9b3a567fd7517f0bf7ea33bb7637c

res/values/strings.xml

@@ -8592,6 +8592,14 @@
     <!-- [CHAR LIMIT=NONE] App notification settings: link to app notification settings-->
     <string name="app_settings_link">Additional settings in the app</string>
 
+    <!-- [CHAR LIMIT=20] 3-dot menu option, reloads the screen to show channels that have not
+    received notifications in the last two week -->
+    <string name="show_unused_channels">Show unused channels</string>
+
+    <!-- [CHAR LIMIT=20] 3-dot menu option, reloads the screen to hide channels that have not
+    received notifications in the last two week -->
+    <string name="hide_unused_channels">Hide unused channels</string>
+
     <!-- [CHAR LIMIT=NONE] Footer listing a count of deleted channels. -->
     <string name="deleted_channels">{count, plural,
       =1      {# category deleted}

src/com/android/settings/notification/NotificationBackend.java

@@ -272,6 +272,16 @@ public class NotificationBackend {
         }
     }
 
+    public ParceledListSlice<NotificationChannelGroup> getGroupsWithRecentBlockedFilter(String pkg,
+            int uid) {
+        try {
+            return sINM.getRecentBlockedNotificationChannelGroupsForPackage(pkg, uid);
+        } catch (Exception e) {
+            Log.w(TAG, "Error calling NoMan", e);
+            return ParceledListSlice.emptyList();
+        }
+    }
+
     public ParceledListSlice<ConversationChannelWrapper> getConversations(String pkg, int uid) {
         try {
             return sINM.getConversationsForPackage(pkg, uid);

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

@@ -16,10 +16,16 @@
 
 package com.android.settings.notification.app;
 
+import static com.android.server.notification.Flags.notificationHideUnusedChannels;
+
+
 import android.app.settings.SettingsEnums;
 import android.content.Context;
 import android.text.TextUtils;
 import android.util.Log;
+import android.view.Menu;
+import android.view.MenuInflater;
+import android.view.MenuItem;
 
 import com.android.internal.widget.LockPatternUtils;
 import com.android.settings.R;
@@ -33,6 +39,8 @@ public class AppNotificationSettings extends NotificationSettings {
     private static final String TAG = "AppNotificationSettings";
     private static final boolean DEBUG = Log.isLoggable(TAG, Log.DEBUG);
 
+    boolean mShowAll = false;
+
     @Override
     public int getMetricsCategory() {
         return SettingsEnums.NOTIFICATION_APP_NOTIFICATION;
@@ -101,4 +109,36 @@ public class AppNotificationSettings extends NotificationSettings {
         mControllers.add(new DeletedChannelsPreferenceController(context, mBackend));
         return new ArrayList<>(mControllers);
     }
+
+    private final int SHOW_ALL_CHANNELS = 1;
+
+    @Override
+    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
+        if (notificationHideUnusedChannels()) {
+            menu.add(Menu.NONE, SHOW_ALL_CHANNELS, Menu.NONE,
+                    mShowAll ? R.string.hide_unused_channels : R.string.show_unused_channels);
+        }
+        super.onCreateOptionsMenu(menu, inflater);
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        if (!notificationHideUnusedChannels()) {
+            return super.onOptionsItemSelected(item);
+        }
+        switch (item.getItemId()) {
+            case SHOW_ALL_CHANNELS:
+                mShowAll = !mShowAll;
+                item.setTitle(mShowAll
+                        ? R.string.hide_unused_channels
+                        : R.string.show_unused_channels);
+                ChannelListPreferenceController list =
+                        use(ChannelListPreferenceController.class);
+                list.setShowAll(mShowAll);
+                list.updateState(findPreference(list.getPreferenceKey()));
+                return true;
+            default:
+                return super.onOptionsItemSelected(item);
+        }
+    }
 }

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

@@ -18,6 +18,7 @@ package com.android.settings.notification.app;
 
 import static android.app.NotificationManager.IMPORTANCE_LOW;
 import static android.app.NotificationManager.IMPORTANCE_NONE;
+import static com.android.server.notification.Flags.notificationHideUnusedChannels;
 
 import android.app.NotificationChannel;
 import android.app.NotificationChannelGroup;
@@ -58,6 +59,8 @@ public class ChannelListPreferenceController extends NotificationPreferenceContr
     private List<NotificationChannelGroup> mChannelGroupList;
     private PreferenceCategory mPreference;
 
+    private boolean mShowAll;
+
     public ChannelListPreferenceController(Context context, NotificationBackend backend) {
         super(context, backend);
     }
@@ -96,7 +99,16 @@ public class ChannelListPreferenceController extends NotificationPreferenceContr
         new AsyncTask<Void, Void, Void>() {
             @Override
             protected Void doInBackground(Void... unused) {
+                if (notificationHideUnusedChannels()) {
+                    if (mShowAll) {
                         mChannelGroupList = mBackend.getGroups(mAppRow.pkg, mAppRow.uid).getList();
+                    } else {
+                        mChannelGroupList = mBackend.getGroupsWithRecentBlockedFilter(mAppRow.pkg,
+                                mAppRow.uid).getList();
+                    }
+                } else {
+                    mChannelGroupList = mBackend.getGroups(mAppRow.pkg, mAppRow.uid).getList();
+                }
                 Collections.sort(mChannelGroupList, CHANNEL_GROUP_COMPARATOR);
                 return null;
             }
@@ -111,6 +123,10 @@ public class ChannelListPreferenceController extends NotificationPreferenceContr
         }.execute();
     }
 
+    protected void setShowAll(boolean showAll) {
+        mShowAll = showAll;
+    }
+
     /**
      * Update the preferences group to match the
      * @param groupPrefsList