Allow turning off currently active modes

Even if they don't allow manual invocation. The button will disappear afterwards -- maybe not perfect but good enough.

Fixes: 355613076
Test: atest ZenModeButtonPreferenceControllerTest
Flag: android.app.modes_ui
Change-Id: I36cc96f7da78266be1a03e947304fc8e600899de

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

@@ -16,6 +16,8 @@
 
 package com.android.settings.notification.modes;
 
+import static com.google.common.base.Preconditions.checkNotNull;
+
 import android.annotation.NonNull;
 import android.content.Context;
 import android.provider.Settings;
@@ -36,8 +38,8 @@ class ZenModeButtonPreferenceController extends AbstractZenModePreferenceControl
     private static final String TAG = "ZenModeButtonPrefController";
 
     private Button mZenButton;
-    private Fragment mParent;
+    private final Fragment mParent;
-    private ManualDurationHelper mDurationHelper;
+    private final ManualDurationHelper mDurationHelper;
 
     ZenModeButtonPreferenceController(Context context, String key, Fragment parent,
             ZenModesBackend backend) {
@@ -48,7 +50,8 @@ class ZenModeButtonPreferenceController extends AbstractZenModePreferenceControl
 
     @Override
     public boolean isAvailable(ZenMode zenMode) {
-        return zenMode.getRule().isManualInvocationAllowed() && zenMode.getRule().isEnabled();
+        return zenMode.isEnabled()
+                && (zenMode.isActive() || zenMode.getRule().isManualInvocationAllowed());
     }
 
     @Override
@@ -57,6 +60,7 @@ class ZenModeButtonPreferenceController extends AbstractZenModePreferenceControl
             mZenButton = ((LayoutPreference) preference).findViewById(R.id.activate_mode);
         }
         mZenButton.setOnClickListener(v -> {
+            checkNotNull(mBackend, "Backend not available!");
             if (zenMode.isActive()) {
                 mBackend.deactivateMode(zenMode);
             } else {

tests/robotests/src/com/android/settings/notification/modes/ZenModeButtonPreferenceControllerTest.java

@@ -89,6 +89,16 @@ public final class ZenModeButtonPreferenceControllerTest {
         assertThat(mController.isAvailable()).isFalse();
     }
 
+    @Test
+    public void isAvailable_ifModeActiveEvenIfAppOptsOut() {
+        ZenMode zenMode = new TestModeBuilder()
+                .setManualInvocationAllowed(false)
+                .setActive(true)
+                .build();
+        mController.setZenMode(zenMode);
+        assertThat(mController.isAvailable()).isTrue();
+    }
+
     @Test
     public void isAvailable_notIfModeDisabled() {
         ZenMode zenMode = new TestModeBuilder()
@@ -119,7 +129,6 @@ public final class ZenModeButtonPreferenceControllerTest {
         LayoutPreference pref = mock(LayoutPreference.class);
         when(pref.findViewById(anyInt())).thenReturn(button);
         ZenMode zenMode = new TestModeBuilder()
-                .setManualInvocationAllowed(true)
                 .setActive(true)
                 .build();
 
@@ -151,7 +160,6 @@ public final class ZenModeButtonPreferenceControllerTest {
         LayoutPreference pref = mock(LayoutPreference.class);
         when(pref.findViewById(anyInt())).thenReturn(button);
         ZenMode zenMode = new TestModeBuilder()
-                .setManualInvocationAllowed(true)
                 .setActive(true)
                 .build();