Add button for activating modes manually

Fixes: 308819907
Flag: android.app.modes_ui
Test: ZenModeButtonPreferenceControllerTest
Test: atest com.android.settings.notification.modes
Change-Id: Id018d360c648dd948d2f950ca67cfbea71cc5c68

src/com/android/settings/notification/modes/ZenModeFragmentBase.java

@@ -53,10 +53,25 @@ abstract class ZenModeFragmentBase extends ZenModesFragmentBase {
             if (!reloadMode(id)) {
                 Log.d(TAG, "Mode id " + id + " not found");
                 toastAndFinish();
+                return;
             }
         } else {
             Log.d(TAG, "Mode id required to set mode config settings");
             toastAndFinish();
+            return;
+        }
+        if (mZenMode != null) {
+            // Propagate mode info through to controllers.
+            for (List<AbstractPreferenceController> list : getPreferenceControllers()) {
+                try {
+                    for (AbstractPreferenceController controller : list) {
+                        // mZenMode guaranteed non-null from reloadMode() above
+                        ((AbstractZenModePreferenceController) controller).setZenMode(mZenMode);
+                    }
+                } catch (ClassCastException e) {
+                    // ignore controllers that aren't AbstractZenModePreferenceController
+                }
+            }
         }
     }