Initial commit. Working well.

.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties
+### Android template
+# Built application files
+*.apk
+*.aar
+*.ap_
+*.aab
+
+# Files for the ART/Dalvik VM
+*.dex
+
+# Java class files
+*.class
+
+# Generated files
+bin/
+gen/
+out/
+#  Uncomment the following line in case you need and you don't have the release build type files in your app
+# release/
+
+# Gradle files
+.gradle/
+build/
+
+# Local configuration file (sdk path, etc)
+local.properties
+
+# Proguard folder generated by Eclipse
+proguard/
+
+# Log Files
+*.log
+
+# Android Studio Navigation editor temp files
+.navigation/
+
+# Android Studio captures folder
+captures/
+
+# IntelliJ
+*.iml
+.idea/workspace.xml
+.idea/tasks.xml
+.idea/gradle.xml
+.idea/assetWizardSettings.xml
+.idea/dictionaries
+.idea/libraries
+# Android Studio 3 in .gitignore file.
+.idea/caches
+.idea/modules.xml
+# Comment next line if keeping position of elements in Navigation Editor is relevant for you
+.idea/navEditor.xml
+
+# Keystore files
+# Uncomment the following lines if you do not want to check your keystore files in.
+#*.jks
+#*.keystore
+
+# External native build folder generated in Android Studio 2.2 and later
+.externalNativeBuild
+.cxx/
+
+# Google Services (e.g. APIs or Firebase)
+# google-services.json
+
+# Freeline
+freeline.py
+freeline/
+freeline_project_description.json
+
+# fastlane
+fastlane/report.xml
+fastlane/Preview.html
+fastlane/screenshots
+fastlane/test_output
+fastlane/readme.md
+
+# Version control
+vcs.xml
+
+# lint
+lint/intermediates/
+lint/generated/
+lint/outputs/
+lint/tmp/
+# lint/reports/
+
+# Android Profiling
+*.hprof
+

app/.gitignore

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+/build

app/build.gradle

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+plugins {
+    id 'com.android.application'
+    id 'kotlin-android'
+}
+
+android {
+    compileSdk 31
+
+    defaultConfig {
+        applicationId "balti.xposed.pixelifygooglephotos"
+        minSdk 21
+        targetSdk 31
+        versionCode 1
+        versionName "1.0"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+    kotlinOptions {
+        jvmTarget = '1.8'
+    }
+}
+
+dependencies {
+
+    implementation 'androidx.core:core-ktx:1.7.0'
+    implementation 'androidx.appcompat:appcompat:1.3.1'
+    implementation 'com.google.android.material:material:1.4.0'
+
+    // Xposed API
+    compileOnly 'de.robv.android.xposed:api:82'
+    compileOnly 'de.robv.android.xposed:api:82:sources'
+}

app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="balti.xposed.pixelifygooglephotos">
+
+    <application
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.PixelifyGooglePhotos" >
+
+        <meta-data
+            android:name="xposedmodule"
+            android:value="true" />
+        <meta-data
+            android:name="xposeddescription"
+            android:value="Module Google Pixel features in Google Photos on any device." />
+        <meta-data
+            android:name="xposedminversion"
+            android:value="90" />
+        <meta-data
+            android:name="xposedscope"
+            android:resource="@array/module_scope" />
+    </application>
+
+</manifest>

app/src/main/assets/xposed_init

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+balti.xposed.pixelifygooglephotos.FeatureSpoofer

app/src/main/java/balti/xposed/pixelifygooglephotos/Constants.kt

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+package balti.xposed.pixelifygooglephotos
+
+object Constants {
+    val PREF_USE_PIXEL_2016 = "PREF_USE_PIXEL_2016"
+}

app/src/main/java/balti/xposed/pixelifygooglephotos/FeatureSpoofer.kt

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+package balti.xposed.pixelifygooglephotos
+
+import android.util.Log
+import balti.xposed.pixelifygooglephotos.Constants.PREF_USE_PIXEL_2016
+import de.robv.android.xposed.*
+import de.robv.android.xposed.callbacks.XC_LoadPackage
+
+class FeatureSpoofer: IXposedHookLoadPackage {
+
+    /**
+     * For Pixel 2016 only features.
+     * Use at your own risk.
+     * By default [featuresToSpoof] will be used.
+     * https://github.com/DotOS/android_vendor_dot/blob/55f1c26bb6dbb1175d96cf538ae113618caf7d06/prebuilt/common/etc/pixel_2016_exclusive.xml
+     */
+    private val featuresToSpoofPixel2016: List<String> = listOf(
+        "com.google.android.apps.photos.NEXUS_PRELOAD",
+        "com.google.android.apps.photos.nexus_preload",
+    )
+
+    /**
+     * Features from PixelFeatureDrops magisk module.
+     * https://github.com/ayush5harma/PixelFeatureDrops/tree/master/system/etc/sysconfig
+     */
+    private val featuresToSpoof: List<String> = featuresToSpoofPixel2016 + listOf(
+        "com.google.android.feature.PIXEL_2017_EXPERIENCE",
+        "com.google.android.feature.PIXEL_2018_EXPERIENCE",
+        "com.google.android.feature.PIXEL_2019_EXPERIENCE",
+        "com.google.android.feature.PIXEL_2019_MIDYEAR_EXPERIENCE",
+        "com.google.android.feature.PIXEL_2020_EXPERIENCE",
+        "com.google.android.feature.PIXEL_2020_MIDYEAR_EXPERIENCE",
+    )
+
+    /**
+     * Actual class is not android.content.pm.PackageManager.
+     * It is an abstract class which cannot be hooked.
+     * Actual class found from stackoverflow:
+     * https://stackoverflow.com/questions/66523720/xposed-cant-hook-getinstalledapplications
+     */
+    private val CLASS_APPLICATION_MANAGER = "android.app.ApplicationPackageManager"
+
+    /**
+     * Method hasSystemFeature(). Two signatures exist. We need to hook both.
+     * https://developer.android.com/reference/android/content/pm/PackageManager#hasSystemFeature(java.lang.String)
+     * https://developer.android.com/reference/android/content/pm/PackageManager#hasSystemFeature(java.lang.String,%20int)
+     */
+    private val METHOD_HAS_SYSTEM_FEATURE = "hasSystemFeature"
+
+    /**
+     * Simple message to log messages in xposed log as well as android log.
+     */
+    private fun log(message: String){
+        XposedBridge.log("PixelifyGooglePhotos: $message")
+        Log.d("PixelifyGooglePhotos", message)
+    }
+
+    /**
+     * To read preference of user.
+     */
+    private val pref by lazy {
+        XSharedPreferences("balti.xposed.pixelifygooglephotos")
+    }
+
+    /**
+     * This is the final list of features to spoof.
+     * If user has selected to use Pixel 2016 features, use [featuresToSpoofPixel2016],
+     * else use [featuresToSpoof] (default selection).
+     */
+    private val finalFeaturesToSpoof by lazy {
+        if (pref.getBoolean(PREF_USE_PIXEL_2016, false)) featuresToSpoofPixel2016
+        else featuresToSpoof
+    }
+
+    /**
+     * If a feature needed for google photos is needed, i.e. features in [finalFeaturesToSpoof],
+     * then set result of hooked method [METHOD_HAS_SYSTEM_FEATURE] as `true`.
+     * Else don't set anything.
+     *
+     * The [METHOD_HAS_SYSTEM_FEATURE] will be hooked anyway, but if the arguments passed,
+     * is in [finalFeaturesToSpoof], then set result as true.
+     */
+    private fun returnTrueForSpoofedFeature(param: XC_MethodHook.MethodHookParam?){
+        val arguments = param?.args?.toList()
+
+        var isFeatureToBeSpoofed = false
+        arguments?.forEach {
+            if (it.toString() in finalFeaturesToSpoof) isFeatureToBeSpoofed = true
+        }
+
+        if (isFeatureToBeSpoofed) param?.setResult(true)
+    }
+
+    override fun handleLoadPackage(lpparam: XC_LoadPackage.LoadPackageParam?) {
+        log("Loaded ${lpparam?.packageName}")
+
+        /**
+         * Hook hasSystemFeature(String).
+         */
+        XposedHelpers.findAndHookMethod(
+            CLASS_APPLICATION_MANAGER,
+            lpparam?.classLoader,
+            METHOD_HAS_SYSTEM_FEATURE, String::class.java,
+            object: XC_MethodHook() {
+
+                override fun beforeHookedMethod(param: MethodHookParam?) {
+                    super.beforeHookedMethod(param)
+                    log("$METHOD_HAS_SYSTEM_FEATURE String")
+                    returnTrueForSpoofedFeature(param)
+                }
+
+            }
+        )
+
+        /**
+         * Hook hasSystemFeature(String, int).
+         */
+        XposedHelpers.findAndHookMethod(
+            CLASS_APPLICATION_MANAGER,
+            lpparam?.classLoader,
+            METHOD_HAS_SYSTEM_FEATURE, String::class.java, Int::class.java,
+            object: XC_MethodHook() {
+
+                override fun beforeHookedMethod(param: MethodHookParam?) {
+                    super.beforeHookedMethod(param)
+                    log("$METHOD_HAS_SYSTEM_FEATURE (String, Int)")
+                    returnTrueForSpoofedFeature(param)
+                }
+
+            }
+        )
+
+    }
+}