Add android_splash_screen (#903)

Adds a Flutter app designed for devices running at least Android 12 that exemplifies how to implement an animated splash screen with the SplashScreen API.

android_splash_screen/android/.gitignore

@@ -0,0 +1,11 @@
+gradle-wrapper.jar
+/.gradle
+/captures/
+/gradlew
+/gradlew.bat
+/local.properties
+GeneratedPluginRegistrant.java
+
+# Remember to never publicly share your keystore.
+# See https://flutter.dev/docs/deployment/android#reference-the-keystore-from-the-app
+key.properties

android_splash_screen/android/app/build.gradle

@@ -0,0 +1,71 @@
+def localProperties = new Properties()
+def localPropertiesFile = rootProject.file('local.properties')
+if (localPropertiesFile.exists()) {
+    localPropertiesFile.withReader('UTF-8') { reader ->
+        localProperties.load(reader)
+    }
+}
+
+def flutterRoot = localProperties.getProperty('flutter.sdk')
+if (flutterRoot == null) {
+    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
+}
+
+def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
+if (flutterVersionCode == null) {
+    flutterVersionCode = '1'
+}
+
+def flutterVersionName = localProperties.getProperty('flutter.versionName')
+if (flutterVersionName == null) {
+    flutterVersionName = '1.0'
+}
+
+apply plugin: 'com.android.application'
+apply plugin: 'kotlin-android'
+apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
+
+android {
+    compileSdkVersion 31
+
+    sourceSets {
+        main.java.srcDirs += 'src/main/kotlin'
+    }
+
+    defaultConfig {
+        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
+        applicationId "com.example.splash_screen_sample"
+        minSdkVersion 21
+        targetSdkVersion 30
+        versionCode flutterVersionCode.toInteger()
+        versionName flutterVersionName
+    }
+
+    buildTypes {
+        release {
+            // TODO: Add your own signing config for the release build.
+            // Signing with the debug keys for now, so `flutter run --release` works.
+            signingConfig signingConfigs.debug
+        }
+    }
+}
+
+flutter {
+    source '../..'
+}
+
+dependencies {
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+    implementation "androidx.core:core-splashscreen:1.0.0-alpha02"
+    implementation "androidx.core:core:1.5.0-alpha05"
+    implementation "androidx.core:core-ktx:1.6.0"
+    implementation 'androidx.constraintlayout:constraintlayout:1.1.2'
+    implementation "androidx.core:core-animation:1.0.0-alpha02"
+    implementation "androidx.interpolator:interpolator:1.0.0"
+    def appcompat_version = "1.3.1"
+
+    implementation "androidx.appcompat:appcompat:$appcompat_version"
+    // For loading and tinting drawables on older versions of the platform
+    implementation "androidx.appcompat:appcompat-resources:$appcompat_version"
+    implementation "androidx.constraintlayout:constraintlayout:2.1.0"
+}

android_splash_screen/android/app/src/debug/AndroidManifest.xml

@@ -0,0 +1,7 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.example.splash_screen_sample">
+    <!-- Flutter needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>

android_splash_screen/android/app/src/main/AndroidManifest.xml

@@ -0,0 +1,41 @@
+<!--
+  ~ Copyright (C) 2021 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.
+  -->
+
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.example.splash_screen_sample">
+   <application
+        android:label="splash_screen_sample"
+        android:icon="@mipmap/ic_launcher">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true"
+            android:theme="@style/LaunchTheme"
+            android:launchMode="singleTop"
+            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
+            android:hardwareAccelerated="true"
+            android:windowSoftInputMode="adjustResize">
+          <intent-filter>
+            <action android:name="android.intent.action.MAIN"/>
+                <category android:name="android.intent.category.LAUNCHER"/>
+          </intent-filter>
+        </activity>
+        <!-- Don't delete the meta-data below.
+             This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
+        <meta-data
+            android:name="flutterEmbedding"
+            android:value="2" />
+    </application>
+</manifest>

android_splash_screen/android/app/src/main/kotlin/com/example/splash_screen_sample/MainActivity.kt

@@ -0,0 +1,211 @@
+/*
+ * Copyright (C) 2021 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.example.splash_screen_sample
+
+import android.animation.AnimatorSet
+import android.animation.ObjectAnimator
+import android.animation.ValueAnimator
+import android.os.Bundle
+import android.transition.AutoTransition
+import android.transition.Transition
+import android.transition.TransitionManager
+import android.view.animation.AccelerateDecelerateInterpolator
+import android.view.View
+import android.widget.FrameLayout
+import androidx.constraintlayout.widget.ConstraintLayout
+import androidx.constraintlayout.widget.ConstraintSet
+import androidx.core.animation.doOnEnd
+import androidx.core.splashscreen.SplashScreen.Companion.installSplashScreen
+import androidx.core.splashscreen.SplashScreenViewProvider
+import androidx.core.view.postDelayed
+import androidx.core.view.ViewCompat
+import androidx.core.view.WindowCompat
+import androidx.core.view.WindowInsetsCompat
+import androidx.interpolator.view.animation.FastOutLinearInInterpolator
+import io.flutter.embedding.android.FlutterActivity
+
+class MainActivity : FlutterActivity() {
+
+  var flutterUIReady : Boolean = false
+  var initialAnimationFinished : Boolean = false
+
+  override fun onCreate(savedInstanceState: Bundle?) {
+    super.onCreate(savedInstanceState)
+
+    // This activity will be handling the splash screen transition.
+    val splashScreen = installSplashScreen()
+
+    // The splash screen goes edge to edge, so for a smooth transition to our app, also
+    // want to draw edge to edge.
+    WindowCompat.setDecorFitsSystemWindows(window, false)
+    val insetsController = WindowCompat.getInsetsController(window, window.decorView)
+    insetsController?.isAppearanceLightNavigationBars = true
+    insetsController?.isAppearanceLightStatusBars = true
+
+    // The content view needs to be set before calling setOnExitAnimationListener
+    // to ensure that the SplashScreenView is attached to the right view root.
+    val rootLayout = findViewById(android.R.id.content) as FrameLayout
+    View.inflate(this, R.layout.main_activity_2, rootLayout)
+
+    ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.container)) { view, windowInsets ->
+      val insets = windowInsets.getInsets(WindowInsetsCompat.Type.systemBars())
+      view.setPadding(insets.left, insets.top, insets.right, insets.bottom)
+      windowInsets.inset(insets)
+    }
+
+    // Setting an OnExitAnimationListener on the splash screen indicates
+    // to the system that the application will handle the exit animation.
+    // The listener will be called once the app is ready.
+    splashScreen.setOnExitAnimationListener { splashScreenViewProvider ->
+      onSplashScreenExit(splashScreenViewProvider)
+    }
+  }
+
+  override fun onFlutterUiDisplayed(){
+    flutterUIReady = true
+
+    if (initialAnimationFinished) {
+      hideSplashScreenAnimation()
+    }
+  }
+
+  override fun onFlutterUiNoLongerDisplayed(){
+    flutterUIReady = false
+  }
+
+  /**
+   * Hides the splash screen only when the entire animation has finished and the Flutter UI is ready to display.
+   */
+  private fun hideSplashScreenAnimation(){
+    val splashView = findViewById(R.id.container) as ConstraintLayout
+    splashView
+      .animate()
+      .alpha(0.0f)
+      .setDuration(SPLASHSCREEN_FINAL_ANIMATION_ALPHA_ANIMATION_DURATION)
+  }
+
+  /**
+   * Handles the transition from the splash screen to the application.
+   */
+  private fun onSplashScreenExit(splashScreenViewProvider: SplashScreenViewProvider) {
+    val accelerateInterpolator = FastOutLinearInInterpolator()
+    val splashScreenView = splashScreenViewProvider.view
+    val iconView = splashScreenViewProvider.iconView
+
+    // Change the alpha of the main view.
+    val alpha = ValueAnimator.ofInt(255, 0)
+    alpha.duration = SPLASHSCREEN_ALPHA_ANIMATION_DURATION
+    alpha.interpolator = accelerateInterpolator
+
+    // And translate the icon down.
+    val translationY = ObjectAnimator.ofFloat(
+      iconView,
+      View.TRANSLATION_Y,
+      iconView.translationY,
+      splashScreenView.height.toFloat()
+    )
+    translationY.duration = SPLASHSCREEN_TY_ANIMATION_DURATION
+    translationY.interpolator = accelerateInterpolator
+
+    // And play all of the animation together.
+    val animatorSet = AnimatorSet()
+    animatorSet.playTogether(alpha)
+
+    // Apply layout constraints of starting frame of animation to
+    // FrameLayout's container for the TransitionManager to know
+    // where to start the transition.
+    val root = findViewById<ConstraintLayout>(R.id.container)
+    val set1 = ConstraintSet().apply {
+      clone(this@MainActivity, R.layout.main_activity)
+    }
+    set1.applyTo(root)
+
+    // Retrieve layout constraints of final frame of animation
+    // for TransitionManager to know where to end the transition.
+    val set2 = ConstraintSet().apply {
+      clone(this@MainActivity, R.layout.main_activity_2)
+    }
+
+    var transitionStarted = false
+    val autoTransition = AutoTransition().apply {
+      interpolator = AccelerateDecelerateInterpolator()
+    }
+    autoTransition.addListener(object: Transition.TransitionListener {
+      override fun onTransitionEnd(transition: Transition) {
+        initialAnimationFinished = true
+
+        if (flutterUIReady) {
+          hideSplashScreenAnimation()
+        }
+    }
+      override fun onTransitionCancel(transition: Transition){}
+      override fun onTransitionPause(transition: Transition) {}
+      override fun onTransitionResume(transition: Transition) {}
+      override fun onTransitionStart(transition: Transition) {}
+    })
+
+    val alphaUpdateListener: (ValueAnimator) -> Unit = { valueAnimator ->
+      if (!transitionStarted && valueAnimator.animatedFraction > 0.5) {
+        transitionStarted = true
+
+        TransitionManager.beginDelayedTransition(root, autoTransition)
+        iconView.visibility = View.GONE
+
+        // Apply constraints of final frame of animation to
+        // FrameLayout's container once the transition is in progress.
+        set2.applyTo(root)
+      }
+      splashScreenView.background.alpha = valueAnimator.animatedValue as Int
+    }
+    alpha.addUpdateListener(alphaUpdateListener)
+
+    // Once the application is finished, remove the splash screen from our view
+    // hierarchy.
+    animatorSet.doOnEnd {
+      splashScreenViewProvider.remove()
+    }
+
+    waitForAnimatedIconToFinish(splashScreenViewProvider, splashScreenView) {
+      animatorSet.start()
+    }
+  }
+
+  /**
+   * Wait until the AVD animation is finished before starting the splash screen dismiss animation.
+   */
+  private fun SplashScreenViewProvider.remainingAnimationDuration() = iconAnimationStartMillis +
+    iconAnimationDurationMillis - System.currentTimeMillis()
+
+  private fun waitForAnimatedIconToFinish(
+    splashScreenViewProvider: SplashScreenViewProvider,
+    view: View,
+    onAnimationFinished: () -> Unit
+  ) {
+    // If wanting to wait for our Animated Vector Drawable to finish animating, can compute
+    // the remaining time to delay the start of the exit animation.
+    val delayMillis: Long =
+      if (WAIT_FOR_AVD_TO_FINISH) splashScreenViewProvider.remainingAnimationDuration() else 0
+    view.postDelayed(delayMillis, onAnimationFinished)
+  }
+
+  private companion object {
+    const val SPLASHSCREEN_ALPHA_ANIMATION_DURATION = 500 as Long
+    const val SPLASHSCREEN_TY_ANIMATION_DURATION = 500 as Long
+    const val SPLASHSCREEN_FINAL_ANIMATION_ALPHA_ANIMATION_DURATION = 250 as Long
+    const val WAIT_FOR_AVD_TO_FINISH = false
+  }
+}

android_splash_screen/android/app/src/main/res/drawable/android.xml

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright 2021 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.
+  -->
+
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="72dp"
+    android:height="72dp"
+    android:viewportHeight="800"
+    android:viewportWidth="800">
+  <path
+      android:fillColor="#3ddc84"
+      android:pathData="m596.328,310.906c22.484,-39.699 46.513,-78.699 68.084,-118.812 4.258,-14.364 -17.654,-23.707 -25.102,-10.703 -22.603,38.973 -45.139,77.986 -67.716,116.974 -107.224,-48.772 -235.192,-48.772 -342.415,0 -23.491,-39.715 -45.567,-80.447 -69.895,-119.56 -10.384,-10.813 -29.373,3.556 -21.753,16.461 22.277,38.562 44.614,77.091 66.914,115.64C88.641,372.042 9.442,494.721 -0,625c266.667,0 533.333,0 800,0C790.261,494.557 711.967,372.81 596.328,310.906ZM216.039,511.17c-24.214,1.092 -41.724,-28.29 -29.21,-49.016 10.591,-21.768 44.808,-23.114 57.082,-2.246 14.575,21.206 -2.056,51.902 -27.872,51.263zM584.348,511.17c-24.214,1.092 -41.724,-28.29 -29.21,-49.016 10.591,-21.768 44.808,-23.114 57.082,-2.246 14.575,21.206 -2.055,51.902 -27.872,51.263z"
+      android:strokeWidth="1.93078" />
+</vector>

android_splash_screen/android/app/src/main/res/drawable/android_background.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<!--
+  ~ Copyright (C) 2021 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.
+  -->
+
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="oval">
+  <solid android:color="@color/logo_background" />
+</shape>

android_splash_screen/android/app/src/main/res/drawable/splashscreen_icon.xml

@@ -0,0 +1,80 @@
+<!--
+  ~ Copyright (C) 2021 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.
+  -->
+
+<!-- This is the animated Android icon that initiates the entire splash screen animation-->
+
+<animated-vector xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:aapt="http://schemas.android.com/aapt">
+  <aapt:attr name="android:drawable">
+    <vector
+        android:width="108dp"
+        android:height="108dp"
+        android:viewportHeight="432"
+        android:viewportWidth="432">
+      <!--
+       Scale down the icon and translate if to fit
+       within the inner 2/3 (scale <= 0.67) or the viewport.
+      -->
+      <group
+          android:translateX="97"
+          android:translateY="97"
+          android:scaleX="0.55"
+          android:scaleY="0.55">
+        <clip-path android:pathData="m322.02,167.89c12.141,-21.437 25.117,-42.497 36.765,-64.158 2.2993,-7.7566 -9.5332,-12.802 -13.555,-5.7796 -12.206,21.045 -24.375,42.112 -36.567,63.166 -57.901,-26.337 -127.00,-26.337 -184.90,0.0 -12.685,-21.446 -24.606,-43.441 -37.743,-64.562 -5.6074,-5.8390 -15.861,1.9202 -11.747,8.8889 12.030,20.823 24.092,41.629 36.134,62.446C47.866,200.90 5.0987,267.15 0.0,337.5c144.00,0.0 288.00,0.0 432.0,0.0C426.74,267.06 384.46,201.32 322.02,167.89ZM116.66,276.03c-13.076,0.58968 -22.531,-15.277 -15.773,-26.469 5.7191,-11.755 24.196,-12.482 30.824,-1.2128 7.8705,11.451 -1.1102,28.027 -15.051,27.682zM315.55,276.03c-13.076,0.58968 -22.531,-15.277 -15.773,-26.469 5.7191,-11.755 24.196,-12.482 30.824,-1.2128 7.8705,11.451 -1.1097,28.027 -15.051,27.682z" />
+        <path
+            android:fillColor="#3ddc84"
+            android:pathData="m322.02,167.89c12.141,-21.437 25.117,-42.497 36.765,-64.158 2.2993,-7.7566 -9.5332,-12.802 -13.555,-5.7796 -12.206,21.045 -24.375,42.112 -36.567,63.166 -57.901,-26.337 -127.00,-26.337 -184.90,0.0 -12.685,-21.446 -24.606,-43.441 -37.743,-64.562 -5.6074,-5.8390 -15.861,1.9202 -11.747,8.8889 12.030,20.823 24.092,41.629 36.134,62.446C47.866,200.90 5.0987,267.15 0.0,337.5c144.00,0.0 288.00,0.0 432.0,0.0C426.74,267.06 384.46,201.32 322.02,167.89ZM116.66,276.03c-13.076,0.58968 -22.531,-15.277 -15.773,-26.469 5.7191,-11.755 24.196,-12.482 30.824,-1.2128 7.8705,11.451 -1.1102,28.027 -15.051,27.682zM315.55,276.03c-13.076,0.58968 -22.531,-15.277 -15.773,-26.469 5.7191,-11.755 24.196,-12.482 30.824,-1.2128 7.8705,11.451 -1.1097,28.027 -15.051,27.682z"
+            android:strokeWidth="1.93078" />
+        <group android:name="anim">
+          <path
+              android:fillAlpha="0.999"
+              android:fillColor="#979797"
+              android:fillType="nonZero"
+              android:pathData="m-197.42,638.59c0.0,0.0 -5.9627,-259.30 46.113,-215.87 32.895,27.437 76.838,-65.597 91.553,-46.592 2.7119,-7.7182 95.045,109.16 139.74,17.953 10.678,-21.792 43.788,-64.489 78.236,-16.164 54.226,76.069 110.90,-100.75 179.84,-17.966 36.393,43.701 96.377,-23.605 148.05,19.889 42.614,35.869 83.166,3.7255 109.76,61.101 24.321,52.465 35.893,197.64 35.893,197.64L631.77,92.867L-197.42,92.867Z"
+              android:strokeAlpha="1"
+              android:strokeColor="#00000000"
+              android:strokeWidth="12" />
+        </group>
+      </group>
+    </vector>
+  </aapt:attr>
+
+  <target android:name="anim">
+    <aapt:attr name="android:animation">
+      <objectAnimator
+          android:duration="1000"
+          android:propertyName="translateY"
+          android:repeatCount="0"
+          android:valueFrom="0"
+          android:valueTo="-432"
+          android:valueType="floatType"
+          android:interpolator="@android:interpolator/accelerate_decelerate" />
+    </aapt:attr>
+  </target>
+  <target android:name="anim">
+    <aapt:attr name="android:animation">
+      <objectAnimator
+          android:duration="500"
+          android:propertyName="translateX"
+          android:repeatCount="-1"
+          android:repeatMode="reverse"
+          android:valueFrom="-162"
+          android:valueTo="162"
+          android:valueType="floatType"
+          android:interpolator="@android:interpolator/accelerate_decelerate" />
+    </aapt:attr>
+  </target>
+</animated-vector>

android_splash_screen/android/app/src/main/res/layout/main_activity.xml

@@ -0,0 +1,58 @@
+<!--
+  ~ Copyright (C) 2021 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.
+  -->
+
+<!-- This layout is the first frame of the interpolation animation. -->
+
+<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:id="@+id/container"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+  <ImageView
+      android:id="@+id/icon_background"
+      android:layout_width="192dp"
+      android:layout_height="192dp"
+      app:layout_constraintBottom_toBottomOf="parent"
+      app:layout_constraintEnd_toEndOf="parent"
+      app:layout_constraintHorizontal_bias="0.5"
+      app:layout_constraintStart_toStartOf="parent"
+      app:layout_constraintTop_toTopOf="parent"
+      app:srcCompat="@drawable/android_background" />
+  <ImageView
+      android:id="@+id/imageView"
+      android:layout_width="160dp"
+      android:layout_height="160dp"
+      android:layout_marginBottom="6dp"
+      android:src="@drawable/android"
+      app:layout_constraintBottom_toBottomOf="@+id/icon_background"
+      app:layout_constraintEnd_toEndOf="@+id/icon_background"
+      app:layout_constraintStart_toStartOf="@+id/icon_background"
+      app:layout_constraintTop_toTopOf="@+id/icon_background"
+      app:srcCompat="@drawable/android" />
+  <TextView
+      android:id="@+id/textView"
+      android:layout_width="wrap_content"
+      android:layout_height="wrap_content"
+      android:layout_marginTop="32dp"
+      android:text="Super Splash Screen Demo"
+      android:textSize="24dp"
+      app:layout_constraintEnd_toEndOf="parent"
+      app:layout_constraintHorizontal_bias="0.495"
+      app:layout_constraintStart_toStartOf="parent"
+      app:layout_constraintTop_toBottomOf="@+id/imageView" />
+</androidx.constraintlayout.widget.ConstraintLayout>

android_splash_screen/android/app/src/main/res/layout/main_activity_2.xml

@@ -0,0 +1,76 @@
+<!--
+  ~ Copyright (C) 2021 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.
+  -->
+
+<!-- This layout is the final frame of the interpolation animation. -->
+
+<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:id="@+id/container"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="@color/white">
+
+  <ImageView
+      android:id="@+id/icon_background"
+      android:layout_width="72dp"
+      android:layout_height="72dp"
+      app:layout_constraintBottom_toBottomOf="@+id/imageView"
+      app:layout_constraintEnd_toEndOf="@+id/imageView"
+      app:layout_constraintStart_toStartOf="@+id/imageView"
+      app:layout_constraintTop_toTopOf="@+id/imageView"
+      android:src="@drawable/android_background" />
+  <ImageView
+      android:id="@+id/imageView"
+      android:layout_width="48dp"
+      android:layout_height="48dp"
+      android:layout_marginTop="24dp"
+      android:layout_marginStart="24dp"
+      android:src="@drawable/android"
+      app:layout_constraintStart_toStartOf="parent"
+      app:layout_constraintTop_toTopOf="parent"
+      app:srcCompat="@drawable/android" />
+  <TextView
+      android:id="@+id/textView"
+      android:layout_width="wrap_content"
+      android:layout_height="wrap_content"
+      android:text="Super Splash Screen Demo"
+      android:textSize="24dp"
+      app:layout_constraintBottom_toBottomOf="@+id/imageView"
+      app:layout_constraintEnd_toEndOf="parent"
+      app:layout_constraintHorizontal_bias="0.495"
+      app:layout_constraintStart_toEndOf="@+id/imageView"
+      app:layout_constraintTop_toTopOf="@+id/imageView" />
+
+  <androidx.constraintlayout.helper.widget.Flow
+      android:id="@+id/flow"
+      android:layout_width="wrap_content"
+      android:layout_height="wrap_content"
+      android:layout_marginTop="16dp"
+      android:layout_marginStart="16dp"
+      app:constraint_referenced_ids="imageView2"
+      app:layout_constraintStart_toStartOf="parent"
+      app:layout_constraintTop_toBottomOf="@+id/icon_background" />
+
+  <ImageView
+      android:id="@+id/imageView2"
+      android:layout_width="wrap_content"
+      android:layout_height="wrap_content"
+      android:layout_marginTop="16dp"
+      app:layout_constraintStart_toStartOf="@+id/icon_background"
+      app:layout_constraintTop_toBottomOf="@+id/icon_background"
+      tools:srcCompat="@tools:sample/avatars" />
+</androidx.constraintlayout.widget.ConstraintLayout>

android_splash_screen/android/app/src/main/res/values-night/styles.xml

@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<!--
+  ~ Copyright (C) 2021 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>
+    <style name="Theme.App" parent="Theme.AppCompat.DayNight.NoActionBar">
+        <item name="android:statusBarColor">@android:color/transparent</item>
+        <item name="android:navigationBarColor">@android:color/transparent</item>
+        <item name="android:windowDrawsSystemBarBackgrounds">true</item>
+        <item name="android:enforceNavigationBarContrast">false</item>
+    </style>
+
+    <style name="LaunchTheme" parent="Theme.SplashScreen">
+        <item name="windowSplashScreenBackground">@color/splashScreenBackground</item>
+        <item name="windowSplashScreenAnimatedIcon">@drawable/splashscreen_icon</item>
+        <item name="windowSplashScreenAnimationDuration">2000</item>
+        <item name="postSplashScreenTheme">@style/Theme.App</item>
+    </style>
+</resources>

android_splash_screen/android/app/src/main/res/values/color.xml

@@ -0,0 +1,21 @@
+<!--
+  ~ Copyright (C) 2021 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>
+  <color name="splashScreenBackground">#034565</color>
+  <color name="logo_background">#034565</color>
+  <color name="white">#FFFFFF</color>
+</resources>

android_splash_screen/android/app/src/main/res/values/dimens.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+  Copyright 2021 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>
+  <dimen name="content_animation_margin_start">30dp</dimen>
+  <dimen name="content_animation_margin_end">10dp</dimen>
+</resources>

android_splash_screen/android/app/src/main/res/values/styles.xml

@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<!--
+  ~ Copyright (C) 2021 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>
+  <style name="Theme.App" parent="Theme.AppCompat.DayNight.NoActionBar">
+    <item name="android:statusBarColor">@android:color/transparent</item>
+    <item name="android:navigationBarColor">@android:color/transparent</item>
+    <item name="android:windowDrawsSystemBarBackgrounds">true</item>
+    <item name="android:enforceNavigationBarContrast">false</item>
+  </style>
+
+  <style name="LaunchTheme" parent="Theme.SplashScreen">
+    <item name="windowSplashScreenBackground">@color/splashScreenBackground</item>
+    <item name="windowSplashScreenAnimatedIcon">@drawable/splashscreen_icon</item>
+    <item name="windowSplashScreenAnimationDuration">2000</item>
+    <item name="postSplashScreenTheme">@style/Theme.App</item>
+  </style>
+</resources>

android_splash_screen/android/app/src/profile/AndroidManifest.xml

@@ -0,0 +1,7 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.example.splash_screen_sample">
+    <!-- Flutter needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>

android_splash_screen/android/build.gradle

@@ -0,0 +1,29 @@
+buildscript {
+    ext.kotlin_version = '1.5.31'
+    repositories {
+        google()
+        jcenter()
+    }
+
+    dependencies {
+        classpath 'com.android.tools.build:gradle:4.1.0'
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+    }
+}
+
+allprojects {
+    repositories {
+        google()
+        jcenter()
+    }
+}
+
+rootProject.buildDir = '../build'
+subprojects {
+    project.buildDir = "${rootProject.buildDir}/${project.name}"
+    project.evaluationDependsOn(':app')
+}
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}

android_splash_screen/android/gradle.properties

@@ -0,0 +1,3 @@
+org.gradle.jvmargs=-Xmx1536M
+android.useAndroidX=true
+android.enableJetifier=true

android_splash_screen/android/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,6 @@
+#Fri Jun 23 08:50:38 CEST 2017
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.7-all.zip

android_splash_screen/android/settings.gradle

@@ -0,0 +1,11 @@
+include ':app'
+
+def localPropertiesFile = new File(rootProject.projectDir, "local.properties")
+def properties = new Properties()
+
+assert localPropertiesFile.exists()
+localPropertiesFile.withReader("UTF-8") { reader -> properties.load(reader) }
+
+def flutterSdkPath = properties.getProperty("flutter.sdk")
+assert flutterSdkPath != null, "flutter.sdk not set in local.properties"
+apply from: "$flutterSdkPath/packages/flutter_tools/gradle/app_plugin_loader.gradle"