Force the app dark/light theme in the Gallery app (1/2)

Before this CL, the Gallery app would use a boolean isDarkTheme that
would be toggled and passed to the SystemUITheme to force set the
dark/light theme of the app. However, this does not work for Views and
the AndroidColors, for which we need to set the app dark/light theme
using UiModeManager.

Bug: 238993727
Test: Builds
Change-Id: Ic3efb42d371c6aac8c2a6297a0cb192a780903cd

packages/SystemUI/compose/core/src/com/android/systemui/compose/theme/AndroidColorScheme.kt

@@ -37,7 +37,7 @@ val LocalAndroidColorScheme =
  * Important: Use M3 colors from MaterialTheme.colorScheme whenever possible instead. In the future,
  * most of the colors in this class will be removed in favor of their M3 counterpart.
  */
-class AndroidColorScheme internal constructor(private val context: Context) {
+class AndroidColorScheme internal constructor(context: Context) {
     val colorPrimary = getColor(context, R.attr.colorPrimary)
     val colorPrimaryDark = getColor(context, R.attr.colorPrimaryDark)
     val colorAccent = getColor(context, R.attr.colorAccent)

packages/SystemUI/compose/gallery/Android.bp

@@ -34,6 +34,7 @@ android_library {
     ],
 
     static_libs: [
+        "SystemUI-core",
         "SystemUIComposeCore",
         "SystemUIComposeFeatures",
 

packages/SystemUI/compose/gallery/AndroidManifest.xml

@@ -16,7 +16,40 @@
 -->
 
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
     package="com.android.systemui.compose.gallery">
     <!-- To emulate a display size and density. -->
     <uses-permission android:name="android.permission.WRITE_SECURE_SETTINGS" />
+
+    <application
+        android:name="android.app.Application"
+        android:appComponentFactory="androidx.core.app.AppComponentFactory"
+        tools:replace="android:name,android:appComponentFactory">
+        <!-- Disable providers from SystemUI -->
+        <provider android:name="com.android.systemui.keyguard.KeyguardSliceProvider"
+            android:authorities="com.android.systemui.test.keyguard.disabled"
+            android:enabled="false"
+            tools:replace="android:authorities"
+            tools:node="remove" />
+        <provider android:name="com.google.android.systemui.keyguard.KeyguardSliceProviderGoogle"
+            android:authorities="com.android.systemui.test.keyguard.disabled"
+            android:enabled="false"
+            tools:replace="android:authorities"
+            tools:node="remove" />
+        <provider android:name="com.android.keyguard.clock.ClockOptionsProvider"
+            android:authorities="com.android.systemui.test.keyguard.clock.disabled"
+            android:enabled="false"
+            tools:replace="android:authorities"
+            tools:node="remove" />
+        <provider android:name="com.android.systemui.people.PeopleProvider"
+            android:authorities="com.android.systemui.test.people.disabled"
+            android:enabled="false"
+            tools:replace="android:authorities"
+            tools:node="remove" />
+        <provider android:name="androidx.core.content.FileProvider"
+            android:authorities="com.android.systemui.test.fileprovider.disabled"
+            android:enabled="false"
+            tools:replace="android:authorities"
+            tools:node="remove"/>
+    </application>
 </manifest>

packages/SystemUI/compose/gallery/app/AndroidManifest.xml

@@ -16,6 +16,7 @@
 -->
 
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
     package="com.android.systemui.compose.gallery.app">
     <application
         android:allowBackup="true"
@@ -23,7 +24,8 @@
         android:label="@string/app_name"
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
-        android:theme="@style/Theme.SystemUIGallery">
+        android:theme="@style/Theme.SystemUI.Gallery"
+        tools:replace="android:icon,android:theme,android:label">
         <activity
             android:name="com.android.systemui.compose.gallery.GalleryActivity"
             android:exported="true"

packages/SystemUI/compose/gallery/res/values-night/themes.xml

@@ -1,26 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
-     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.
--->
-<resources xmlns:tools="http://schemas.android.com/tools">
-    <style name="Theme.SystemUIGallery" parent="Theme.AppCompat.DayNight.NoActionBar">
-        <item name="android:statusBarColor" tools:targetApi="l">
-            @android:color/transparent
-        </item>
-        <item name="android:navigationBarColor" tools:targetApi="l">
-            @android:color/transparent
-        </item>
-    </style>
-</resources>

packages/SystemUI/compose/gallery/res/values/themes.xml

@@ -15,7 +15,10 @@
      limitations under the License.
 -->
 <resources xmlns:tools="http://schemas.android.com/tools">
-    <style name="Theme.SystemUIGallery" parent="Theme.AppCompat.DayNight.NoActionBar">
+    <style name="Theme.SystemUI.Gallery">
+        <item name="android:windowActionBar">false</item>
+        <item name="android:windowNoTitle">true</item>
+
         <item name="android:statusBarColor" tools:targetApi="l">
             @android:color/transparent
         </item>

packages/SystemUI/compose/gallery/src/com/android/systemui/compose/gallery/ConfigurationControls.kt

@@ -9,11 +9,12 @@ import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.lazy.LazyRow
 import androidx.compose.material.icons.Icons
-import androidx.compose.material.icons.filled.BrightnessHigh
+import androidx.compose.material.icons.filled.DarkMode
-import androidx.compose.material.icons.filled.BrightnessLow
 import androidx.compose.material.icons.filled.FormatSize
 import androidx.compose.material.icons.filled.FormatTextdirectionLToR
 import androidx.compose.material.icons.filled.FormatTextdirectionRToL
+import androidx.compose.material.icons.filled.InvertColors
+import androidx.compose.material.icons.filled.LightMode
 import androidx.compose.material.icons.filled.Smartphone
 import androidx.compose.material.icons.filled.Tablet
 import androidx.compose.material3.Button
@@ -44,12 +45,13 @@ enum class FontScale(val scale: Float) {
 /** A configuration panel that allows to toggle the theme, font scale and layout direction. */
 @Composable
 fun ConfigurationControls(
-    isDarkTheme: Boolean,
+    theme: Theme,
     fontScale: FontScale,
     layoutDirection: LayoutDirection,
     onChangeTheme: () -> Unit,
     onChangeLayoutDirection: () -> Unit,
     onChangeFontScale: () -> Unit,
+    modifier: Modifier = Modifier,
 ) {
     // The display we are emulating, if any.
     var emulatedDisplayName by rememberSaveable { mutableStateOf<String?>(null) }
@@ -84,18 +86,26 @@ fun ConfigurationControls(
 
     // TODO(b/231131244): Fork FlowRow from Accompanist and use that instead to make sure that users
     // don't miss any available configuration.
-    LazyRow {
+    LazyRow(modifier) {
         // Dark/light theme.
         item {
             TextButton(onChangeTheme) {
                 val text: String
                 val icon: ImageVector
-                if (isDarkTheme) {
+
-                    icon = Icons.Default.BrightnessHigh
+                when (theme) {
-                    text = "Dark"
+                    Theme.System -> {
-                } else {
+                        icon = Icons.Default.InvertColors
-                    icon = Icons.Default.BrightnessLow
+                        text = "System"
-                    text = "Light"
+                    }
+                    Theme.Dark -> {
+                        icon = Icons.Default.DarkMode
+                        text = "Dark"
+                    }
+                    Theme.Light -> {
+                        icon = Icons.Default.LightMode
+                        text = "Light"
+                    }
                 }
 
                 Icon(icon, null)

packages/SystemUI/compose/gallery/src/com/android/systemui/compose/gallery/GalleryActivity.kt

@@ -16,6 +16,8 @@
 
 package com.android.systemui.compose.gallery
 
+import android.app.UiModeManager
+import android.content.Context
 import android.os.Bundle
 import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
@@ -23,7 +25,7 @@ import androidx.compose.foundation.isSystemInDarkTheme
 import androidx.compose.runtime.SideEffect
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
-import androidx.compose.runtime.remember
+import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.graphics.Color
 import androidx.core.view.WindowCompat
@@ -33,22 +35,46 @@ class GalleryActivity : ComponentActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         WindowCompat.setDecorFitsSystemWindows(window, false)
+        val uiModeManager = getSystemService(Context.UI_MODE_SERVICE) as UiModeManager
 
         setContent {
-            val isSystemInDarkTheme = isSystemInDarkTheme()
+            var theme by rememberSaveable { mutableStateOf(Theme.System) }
-            var isDarkTheme by remember { mutableStateOf(isSystemInDarkTheme) }
+            val onChangeTheme = {
-            val onChangeTheme = { isDarkTheme = !isDarkTheme }
+                // Change to the next theme for a toggle behavior.
+                theme =
+                    when (theme) {
+                        Theme.System -> Theme.Dark
+                        Theme.Dark -> Theme.Light
+                        Theme.Light -> Theme.System
+                    }
+            }
 
+            val isSystemInDarkTheme = isSystemInDarkTheme()
+            val isDark = theme == Theme.Dark || (theme == Theme.System && isSystemInDarkTheme)
+            val useDarkIcons = !isDark
             val systemUiController = rememberSystemUiController()
-            val useDarkIcons = !isDarkTheme
             SideEffect {
                 systemUiController.setSystemBarsColor(
                     color = Color.Transparent,
                     darkIcons = useDarkIcons,
                 )
+
+                uiModeManager.setApplicationNightMode(
+                    when (theme) {
+                        Theme.System -> UiModeManager.MODE_NIGHT_AUTO
+                        Theme.Dark -> UiModeManager.MODE_NIGHT_YES
+                        Theme.Light -> UiModeManager.MODE_NIGHT_NO
+                    }
+                )
             }
 
-            GalleryApp(isDarkTheme, onChangeTheme)
+            GalleryApp(theme, onChangeTheme)
         }
     }
 }
+
+enum class Theme {
+    System,
+    Dark,
+    Light,
+}

packages/SystemUI/compose/gallery/src/com/android/systemui/compose/gallery/GalleryApp.kt

@@ -65,7 +65,7 @@ private fun MainContent() {
  */
 @Composable
 fun GalleryApp(
-    isDarkTheme: Boolean,
+    theme: Theme,
     onChangeTheme: () -> Unit,
 ) {
     val systemFontScale = LocalDensity.current.fontScale
@@ -100,14 +100,14 @@ fun GalleryApp(
         LocalDensity provides density,
         LocalLayoutDirection provides layoutDirection,
     ) {
-        SystemUITheme(isDarkTheme) {
+        SystemUITheme {
             Surface(
                 Modifier.fillMaxSize(),
                 color = MaterialTheme.colorScheme.background,
             ) {
                 Column(Modifier.fillMaxSize().systemBarsPadding().padding(16.dp)) {
                     ConfigurationControls(
-                        isDarkTheme,
+                        theme,
                         fontScale,
                         layoutDirection,
                         onChangeTheme,