Added fully functional app

app/.gitignore

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+/build

app/build.gradle

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+plugins {
+    id 'com.android.application'
+    id 'kotlin-android'
+}
+
+android {
+    compileSdkVersion 30
+    buildToolsVersion "30.0.3"
+
+    defaultConfig {
+        applicationId "dev.tylerolson.snapchatdarkmode"
+        minSdkVersion 15
+        targetSdkVersion 29
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    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'
+    }
+}
+
+repositories {
+    maven { url 'https://jitpack.io' }
+}
+
+dependencies {
+
+    implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
+    implementation 'androidx.core:core-ktx:1.3.1'
+    implementation 'androidx.appcompat:appcompat:1.2.0'
+    implementation 'com.google.android.material:material:1.2.1'
+    implementation 'androidx.constraintlayout:constraintlayout:2.0.1'
+    testImplementation 'junit:junit:4.+'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.2'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
+
+    //libsu
+    def libsuVersion = '3.1.2'
+    implementation "com.github.topjohnwu.libsu:core:${libsuVersion}"
+    implementation "com.github.topjohnwu.libsu:io:${libsuVersion}"
+
+}

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/androidTest/java/dev/tylerolson/snapchatdarkmode/ExampleInstrumentedTest.kt

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+package dev.tylerolson.snapchatdarkmode
+
+import androidx.test.platform.app.InstrumentationRegistry
+import androidx.test.ext.junit.runners.AndroidJUnit4
+
+import org.junit.Test
+import org.junit.runner.RunWith
+
+import org.junit.Assert.*
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+@RunWith(AndroidJUnit4::class)
+class ExampleInstrumentedTest {
+    @Test
+    fun useAppContext() {
+        // Context of the app under test.
+        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
+        assertEquals("dev.tylerolson.snapchatdarkmodeenabler", appContext.packageName)
+    }
+}

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="dev.tylerolson.snapchatdarkmode">
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.SnapchatDarkMode">
+        <activity android:name=".MainActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

app/src/main/java/dev/tylerolson/snapchatdarkmode/MainActivity.kt

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+package dev.tylerolson.snapchatdarkmode
+
+import android.app.AlertDialog
+import android.content.DialogInterface
+import android.os.Bundle
+import android.util.Log
+import android.widget.Button
+import android.widget.TextView
+import androidx.appcompat.app.AppCompatActivity
+import com.topjohnwu.superuser.Shell
+
+
+class MainActivity : AppCompatActivity() {
+    private val appTag: String = "SNAPCHAT DARK MODE"
+    private val xmlFile: String = "/data/data/com.snapchat.android/shared_prefs/APP_START_EXPERIMENT_PREFS.xml"
+    private var isDarkModeEnabled: Boolean = false
+    private var isRoot: Boolean = false
+
+    init {
+        // Set settings before the main shell can be created
+        Shell.enableVerboseLogging = BuildConfig.DEBUG
+        Shell.setDefaultBuilder(
+            Shell.Builder.create()
+                .setFlags(Shell.FLAG_REDIRECT_STDERR)
+                .setTimeout(10)
+        )
+    }
+
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_main)
+
+        hasRootAccess()
+
+        val darkModeStatus: TextView = findViewById(R.id.darkModeStatus)
+        checkDarkMode(darkModeStatus)
+
+        val toggleButton: Button = findViewById(R.id.toggleButton)
+        toggleButton.setOnClickListener {
+            if (hasRootAccess()) {
+                if (isDarkModeEnabled) {
+                    disableDarkMode(checkDarkMode(darkModeStatus))
+                } else {
+                    enableDarkMode(checkDarkMode(darkModeStatus))
+                }
+                checkDarkMode(darkModeStatus)
+            }
+        }
+    }
+
+    private fun hasRootAccess(): Boolean {
+        return if (!Shell.rootAccess()) {
+            showDialog(
+                "No Root Access",
+                "Root access could not be given on your device. This app will not work."
+            )
+            false
+        } else {
+            if (!isRoot) {
+                showDialog("Root Access", "Root access has been given on your device. Enjoy!")
+                isRoot = true
+            }
+            true
+        }
+    }
+
+    private fun showDialog(title: String, message: String) {
+        val builder = AlertDialog.Builder(this)
+        builder.setTitle(title)
+            .setMessage(message)
+            .setPositiveButton("Ok") { _: DialogInterface, _: Int -> }
+        builder.show()
+    }
+
+    private fun checkDarkMode(darkModeStatus: TextView): MutableList<String> {
+        val result: Shell.Result = Shell.su("cat $xmlFile").exec()
+
+        Log.e(appTag, "Checking")
+
+        isDarkModeEnabled = false
+        result.out.forEachIndexed { _, it ->
+            Log.e(appTag, it)
+            if (it.contains("<string name=\"DARK_MODE\">ENABLED</string>")) {
+                isDarkModeEnabled = true
+            }
+        }
+
+        if (isDarkModeEnabled) {
+            darkModeStatus.text = "Dark mode is ON"
+        } else {
+            darkModeStatus.text = "Dark mode is OFF"
+        }
+
+        return result.out
+    }
+
+    private fun enableDarkMode(out: MutableList<String>) {
+        Shell.su("sed -i '" + out.size + "d' " + xmlFile).exec()
+        Shell.sh("echo '<string name=\"DARK_MODE\">ENABLED</string>' >> $xmlFile").exec()
+        Shell.sh("echo \"</map>\" >> $xmlFile").exec()
+
+        isDarkModeEnabled = true
+        showDialog("Dark Mode", "Enabled dark mode!")
+    }
+
+    private fun disableDarkMode(out: MutableList<String>) {
+        Shell.su("sed -i '" + (out.size - 1) + "d' " + xmlFile).exec()
+
+        isDarkModeEnabled = false
+        showDialog("Dark Mode", "Disabled dark mode!")
+    }
+
+}

app/src/main/res/layout/activity_main.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".MainActivity">
+
+    <TextView
+        android:id="@+id/darkModeStatus"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="dark_mode_status"
+        android:textSize="24sp"
+        app:layout_constraintBottom_toTopOf="@+id/toggleButton"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.599" />
+
+    <Button
+        android:id="@+id/toggleButton"
+        android:layout_width="202dp"
+        android:layout_height="62dp"
+        android:text="@string/toggle_button"
+        android:textSize="14sp"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.499" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@mipmap/ic_launcher_background"/>
+    <foreground android:drawable="@mipmap/ic_launcher_foreground"/>
+</adaptive-icon>

app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@mipmap/ic_launcher_background"/>
+    <foreground android:drawable="@mipmap/ic_launcher_foreground"/>
+</adaptive-icon>

app/src/main/res/values-night/themes.xml

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+<resources xmlns:tools="http://schemas.android.com/tools">
+    <!-- Base application theme. -->
+    <style name="Theme.SnapchatDarkMode" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
+        <!-- Primary brand color. -->
+        <item name="colorPrimary">@color/yellow</item>
+        <item name="colorPrimaryVariant">@color/black</item>
+        <item name="colorOnPrimary">@color/black</item>
+        <!-- Secondary brand color. -->
+        <item name="colorSecondary">@color/teal_200</item>
+        <item name="colorSecondaryVariant">@color/teal_200</item>
+        <item name="colorOnSecondary">@color/black</item>
+        <!-- Status bar color. -->
+        <item name="android:statusBarColor" tools:targetApi="l">?attr/colorPrimaryVariant</item>
+        <!-- Customize your theme here. -->
+    </style>
+</resources>

app/src/main/res/values/colors.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="yellow">#FFFFFC00</color>
+    <color name="teal_200">#FF03DAC5</color>
+    <color name="teal_700">#FF018786</color>
+    <color name="black">#FF111111</color>
+    <color name="white">#FFFFFFFF</color>
+</resources>