Reset notification shade background tints when theme changes.

These colors were not reset, which could result in colors from the old theme remaining after switching users. This demonstrably solves an issue easily found with the shelf being the wrong color on the lockscreen after switching users.  This is also the very likely to be a fix for the notifications retaining the wrong background color after exiting setup wizard, it's just much harder to repeat that one really often.

Bug: 227880269
Test: atest ActivatableNotificationViewTest
Change-Id: I522f4919c428272da73f2500d68d8245cd1344d8

packages/SystemUI/src/com/android/systemui/statusbar/notification/row/ActivatableNotificationView.java

@@ -151,6 +151,10 @@ public abstract class ActivatableNotificationView extends ExpandableOutlineView
                 R.color.notification_ripple_tinted_color);
         mNormalRippleColor = mContext.getColor(
                 R.color.notification_ripple_untinted_color);
+        // Reset background color tint and override tint, as they are from an old theme
+        mBgTint = NO_COLOR;
+        mOverrideTint = NO_COLOR;
+        mOverrideAmount = 0.0f;
     }
 
     /**

packages/SystemUI/tests/src/com/android/systemui/statusbar/notification/row/ActivatableNotificationViewTest.kt

@@ -0,0 +1,86 @@
+/*
+ * Copyright (C) 2022 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.systemui.statusbar.notification.row
+
+import android.annotation.ColorInt
+import android.graphics.Color
+import android.testing.AndroidTestingRunner
+import android.testing.TestableLooper.RunWithLooper
+import android.view.View
+import androidx.test.filters.SmallTest
+import com.android.settingslib.Utils
+import com.android.systemui.R
+import com.android.systemui.SysuiTestCase
+import com.android.systemui.statusbar.notification.FakeShadowView
+import com.android.systemui.statusbar.notification.NotificationUtils
+import com.android.systemui.util.mockito.mock
+import com.google.common.truth.Truth.assertThat
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@SmallTest
+@RunWith(AndroidTestingRunner::class)
+@RunWithLooper
+class ActivatableNotificationViewTest : SysuiTestCase() {
+    private val mContentView: View = mock()
+    private lateinit var mView: ActivatableNotificationView
+
+    @ColorInt
+    private var mNormalColor = 0
+
+    @Before
+    fun setUp() {
+        mView = object : ActivatableNotificationView(mContext, null) {
+
+            init {
+                onFinishInflate()
+            }
+
+            override fun getContentView(): View {
+                return mContentView
+            }
+
+            override fun <T : View> findViewTraversal(id: Int): T? = when (id) {
+                R.id.backgroundNormal -> mock<NotificationBackgroundView>()
+                R.id.fake_shadow -> mock<FakeShadowView>()
+                else -> null
+            } as T?
+        }
+        mNormalColor =
+            Utils.getColorAttrDefaultColor(mContext, com.android.internal.R.attr.colorSurface)
+    }
+
+    @Test
+    fun testBackgroundBehaviors() {
+        // Color starts with the normal color
+        mView.updateBackgroundColors()
+        assertThat(mView.currentBackgroundTint).isEqualTo(mNormalColor)
+
+        // Setting a tint changes the background to that color specifically
+        mView.setTintColor(Color.BLUE)
+        assertThat(mView.currentBackgroundTint).isEqualTo(Color.BLUE)
+
+        // Setting an override tint blends with the previous tint
+        mView.setOverrideTintColor(Color.RED, 0.5f)
+        assertThat(mView.currentBackgroundTint)
+            .isEqualTo(NotificationUtils.interpolateColors(Color.BLUE, Color.RED, 0.5f))
+
+        // Updating the background colors resets tints, as those won't match the latest theme
+        mView.updateBackgroundColors()
+        assertThat(mView.currentBackgroundTint).isEqualTo(mNormalColor)
+    }
+}