Merge branch '1-add-a-first-hello-world-activity' into 'master'

Resolve "Add a first hello world activity"

Closes #1

See merge request !1

.gitignore

+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.buildlog/
+.history
+.svn/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# The .vscode folder contains launch configuration and tasks you configure in
+# VS Code which you may wish to be included in version control, so this line
+# is commented out by default.
+#.vscode/
+
+# Flutter/Dart/Pub related
+**/doc/api/
+**/ios/Flutter/.last_build_id
+.dart_tool/
+.flutter-plugins
+.flutter-plugins-dependencies
+.packages
+.pub-cache/
+.pub/
+/build/
+
+# Web related
+lib/generated_plugin_registrant.dart
+
+# Symbolication related
+app.*.symbols
+
+# Obfuscation related
+app.*.map.json
+
+# Android Studio will place build artifacts here
+/android/app/debug
+/android/app/profile
+/android/app/release

.gitlab-ci.yml

-stages:
-  - environment
-  - build
-  - test
-  - internal
-  - alpha
-  - beta
-  - production
+image: cirrusci/flutter:latest
 
+stages:
+  - update
+  - build-debug
+  - build-release
+  - deploy
 
-.updateContainerJob:
-  image: docker:stable
-  stage: environment
-  services:
-    - docker:dind
+update:
+  stage: update
   script:
-    - docker login -u gitlab-ci-token -p $CI_JOB_TOKEN $CI_REGISTRY
-    - docker pull $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG || true
-    - docker build --cache-from $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG -t $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG .
-    - docker push $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG
-
-updateContainer:
-  extends: .updateContainerJob
-  only:
-    changes:
-      - Dockerfile
-
-ensureContainer:
-  extends: .updateContainerJob
-  allow_failure: true
-  before_script:
-    - "mkdir -p ~/.docker && echo '{\"experimental\": \"enabled\"}' > ~/.docker/config.json"
-    - docker login -u gitlab-ci-token -p $CI_JOB_TOKEN $CI_REGISTRY
-    # Skip update container `script` if the container already exists
-    # via https://gitlab.com/gitlab-org/gitlab-ce/issues/26866#note_97609397 -> https://stackoverflow.com/a/52077071/796832
-    - docker manifest inspect $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG > /dev/null && exit || true
-  except:
-    changes:
-      - Dockerfile
-
+    - flutter packages get
+    - flutter packages upgrade
+  interruptible: true
 
-.build_job:
-  image: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG
-  stage: build
-  before_script:
-    - chmod +x gradlew
-    - "export VERSION_CODE=$(($CI_PIPELINE_IID)) && echo $VERSION_CODE"
-    - "export VERSION_SHA=`echo ${CI_COMMIT_SHA:0:8}` && echo $VERSION_SHA"
+android:build-debug:
+  stage: build-debug
+  script:
+    # Flutter local configuration
+    - echo flutter.sdk=$FLUTTER_PATH > android/local.properties
+    - echo sdk.dir=$ANDROID_SDK_PATH >> android/local.properties
+    - echo flutter.buildMode=debug >> android/local.properties
+    # Android signing
+    - echo "$ANDROID_DEBUG_KEYSTORE_FILE" | base64 -d > android/app/my.keystore
+    - echo storeFile=my.keystore > android/key.properties
+    - echo storePassword=$ANDROID_DEBUG_KEYSTORE_PASSWORD >> android/key.properties
+    - echo keyAlias=$ANDROID_DEBUG_KEY_ALIAS >> android/key.properties
+    - echo keyPassword=$ANDROID_DEBUG_KEY_PASSWORD >> android/key.properties
+    # build flutter app
+    - flutter build apk --debug
+    # prepare artifact
+    - find . -name "*.apk" # where is my apk?
   artifacts:
     paths:
-    - app/build/outputs
-
-buildDebug:
-  extends: .build_job
-  script:
-    - bundle exec fastlane buildDebug
+      - build/app/outputs/apk/debug
+    expire_in: 1 week
+  interruptible: true
 
-buildRelease:
-  extends: .build_job
-  script:
-    - bundle exec fastlane buildRelease
-  environment:
-    name: production
-
-testDebug:
-  image: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG
-  stage: test
-  dependencies:
-    - buildDebug
-  script:
-    - chmod +x gradlew  
-    - bundle exec fastlane test
-
-.promote_job:
-  image: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG
-  when: manual
-  dependencies: []
-  before_script:
-    - echo You need to add your google_play_api_key.json file for this to work. Please see project's README.md. && false
-    - chmod +x gradlew    
-  after_script:
-    - rm -f ~/google_play_api_key.json
-
-publishInternal:
-  extends: .promote_job
-  image: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG
-  stage: internal
+android:build-release:
+  stage: build-release
+  only:
+    - master
   dependencies:
-    - buildRelease
-  when: manual
-  script:
-    - bundle exec fastlane internal
-
-promoteAlpha:
-  extends: .promote_job
-  stage: alpha
+    - android:build-debug
   script:
-    - bundle exec fastlane promote_internal_to_alpha
-
-promoteBeta:
-  extends: .promote_job
-  stage: beta
-  script:
-    - bundle exec fastlane promote_alpha_to_beta
+    # Flutter local configuration
+    - echo flutter.sdk=$FLUTTER_PATH > android/local.properties
+    - echo sdk.dir=$ANDROID_SDK_PATH >> android/local.properties
+    - echo flutter.buildMode=release >> android/local.properties
+    # Android signing
+    - echo "$ANDROID_KEYSTORE_FILE" | base64 -d > android/app/my.keystore
+    - echo storeFile=my.keystore > android/key.properties
+    - echo storePassword=$ANDROID_KEYSTORE_PASSWORD >> android/key.properties
+    - echo keyAlias=$ANDROID_KEY_ALIAS >> android/key.properties
+    - echo keyPassword=$ANDROID_KEY_PASSWORD >> android/key.properties
+    # build flutter app
+    - flutter build apk
+    # prepare artifact
+    - find . -name "*.apk" # where is my apk?
+  artifacts:
+    paths:
+      - build/app/outputs/apk/release
+    expire_in: 1 week
+  interruptible: true
 
-promoteProduction:
-  extends: .promote_job
-  stage: production
-  # We only allow production promotion on master because
-  # in this way you can protect production scoped secret variables
+android:deploy:
+  stage: deploy
   only:
-   - master
+    - master
+  dependencies:
+    - android:build-release
   script:
-    - bundle exec fastlane promote_beta_to_production
+    - wget ${REPOSITORY_UPDATE_WEBHOOK}?token=${REPOSITORY_TOKEN}

.metadata

+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+  revision: 5bedb7b1d5698ce2c1c67aaf9afae7b3948b172a
+  channel: beta
+
+project_type: app

Dockerfile

-# This Dockerfile creates a static build image for CI
-
-FROM openjdk:8-jdk
-
-# Just matched `app/build.gradle`
-ENV ANDROID_COMPILE_SDK "28"
-# Just matched `app/build.gradle`
-ENV ANDROID_BUILD_TOOLS "28.0.3"
-# Version from https://developer.android.com/studio/releases/sdk-tools
-ENV ANDROID_SDK_TOOLS "24.4.1"
-
-ENV ANDROID_HOME /android-sdk-linux
-ENV PATH="${PATH}:/android-sdk-linux/platform-tools/"
-
-# install OS packages
-RUN apt-get --quiet update --yes
-RUN apt-get --quiet install --yes wget apt-utils tar unzip lib32stdc++6 lib32z1 build-essential ruby ruby-dev
-# We use this for xxd hex->binary
-RUN apt-get --quiet install --yes vim-common
-# install Android SDK
-RUN wget --quiet --output-document=android-sdk.tgz https://dl.google.com/android/android-sdk_r${ANDROID_SDK_TOOLS}-linux.tgz
-RUN tar --extract --gzip --file=android-sdk.tgz
-RUN echo y | android-sdk-linux/tools/android --silent update sdk --no-ui --all --filter android-${ANDROID_COMPILE_SDK}
-RUN echo y | android-sdk-linux/tools/android --silent update sdk --no-ui --all --filter platform-tools
-RUN echo y | android-sdk-linux/tools/android --silent update sdk --no-ui --all --filter build-tools-${ANDROID_BUILD_TOOLS}
-RUN echo y | android-sdk-linux/tools/android --silent update sdk --no-ui --all --filter extra-android-m2repository
-RUN echo y | android-sdk-linux/tools/android --silent update sdk --no-ui --all --filter extra-google-google_play_services
-RUN echo y | android-sdk-linux/tools/android --silent update sdk --no-ui --all --filter extra-google-m2repository
-# install FastLane
-COPY Gemfile.lock .
-COPY Gemfile .
-RUN gem install bundler -v 1.16.6
-RUN bundle install

Gemfile

-source "https://rubygems.org"
-
-gem "fastlane"

Gemfile.lock

-GEM
-  remote: https://rubygems.org/
-  specs:
-    CFPropertyList (3.0.0)
-    addressable (2.6.0)
-      public_suffix (>= 2.0.2, < 4.0)
-    atomos (0.1.3)
-    babosa (1.0.2)
-    claide (1.0.2)
-    colored (1.2)
-    colored2 (3.1.2)
-    commander-fastlane (4.4.6)
-      highline (~> 1.7.2)
-    declarative (0.0.10)
-    declarative-option (0.1.0)
-    digest-crc (0.4.1)
-    domain_name (0.5.20180417)
-      unf (>= 0.0.5, < 1.0.0)
-    dotenv (2.6.0)
-    emoji_regex (1.0.1)
-    excon (0.62.0)
-    faraday (0.15.4)
-      multipart-post (>= 1.2, < 3)
-    faraday-cookie_jar (0.0.6)
-      faraday (>= 0.7.4)
-      http-cookie (~> 1.0.0)
-    faraday_middleware (0.13.1)
-      faraday (>= 0.7.4, < 1.0)
-    fastimage (2.1.5)
-    fastlane (2.116.0)
-      CFPropertyList (>= 2.3, < 4.0.0)
-      addressable (>= 2.3, < 3.0.0)
-      babosa (>= 1.0.2, < 2.0.0)
-      bundler (>= 1.12.0, < 3.0.0)
-      colored
-      commander-fastlane (>= 4.4.6, < 5.0.0)
-      dotenv (>= 2.1.1, < 3.0.0)
-      emoji_regex (>= 0.1, < 2.0)
-      excon (>= 0.45.0, < 1.0.0)
-      faraday (~> 0.9)
-      faraday-cookie_jar (~> 0.0.6)
-      faraday_middleware (~> 0.9)
-      fastimage (>= 2.1.0, < 3.0.0)
-      gh_inspector (>= 1.1.2, < 2.0.0)
-      google-api-client (>= 0.21.2, < 0.24.0)
-      google-cloud-storage (>= 1.15.0, < 2.0.0)
-      highline (>= 1.7.2, < 2.0.0)
-      json (< 3.0.0)
-      mini_magick (~> 4.5.1)
-      multi_json
-      multi_xml (~> 0.5)
-      multipart-post (~> 2.0.0)
-      plist (>= 3.1.0, < 4.0.0)
-      public_suffix (~> 2.0.0)
-      rubyzip (>= 1.2.2, < 2.0.0)
-      security (= 0.1.3)
-      simctl (~> 1.6.3)
-      slack-notifier (>= 2.0.0, < 3.0.0)
-      terminal-notifier (>= 1.6.2, < 2.0.0)
-      terminal-table (>= 1.4.5, < 2.0.0)
-      tty-screen (>= 0.6.3, < 1.0.0)
-      tty-spinner (>= 0.8.0, < 1.0.0)
-      word_wrap (~> 1.0.0)
-      xcodeproj (>= 1.6.0, < 2.0.0)
-      xcpretty (~> 0.3.0)
-      xcpretty-travis-formatter (>= 0.0.3)
-    gh_inspector (1.1.3)
-    google-api-client (0.23.9)
-      addressable (~> 2.5, >= 2.5.1)
-      googleauth (>= 0.5, < 0.7.0)
-      httpclient (>= 2.8.1, < 3.0)
-      mime-types (~> 3.0)
-      representable (~> 3.0)
-      retriable (>= 2.0, < 4.0)
-      signet (~> 0.9)
-    google-cloud-core (1.3.0)
-      google-cloud-env (~> 1.0)
-    google-cloud-env (1.0.5)
-      faraday (~> 0.11)
-    google-cloud-storage (1.16.0)
-      digest-crc (~> 0.4)
-      google-api-client (~> 0.23)
-      google-cloud-core (~> 1.2)
-      googleauth (>= 0.6.2, < 0.10.0)
-    googleauth (0.6.7)
-      faraday (~> 0.12)
-      jwt (>= 1.4, < 3.0)
-      memoist (~> 0.16)
-      multi_json (~> 1.11)
-      os (>= 0.9, < 2.0)
-      signet (~> 0.7)
-    highline (1.7.10)
-    http-cookie (1.0.3)
-      domain_name (~> 0.5)
-    httpclient (2.8.3)
-    json (2.1.0)
-    jwt (2.1.0)
-    memoist (0.16.0)
-    mime-types (3.2.2)
-      mime-types-data (~> 3.2015)
-    mime-types-data (3.2018.0812)
-    mini_magick (4.5.1)
-    multi_json (1.13.1)
-    multi_xml (0.6.0)
-    multipart-post (2.0.0)
-    nanaimo (0.2.6)
-    naturally (2.2.0)
-    os (1.0.0)
-    plist (3.5.0)
-    public_suffix (2.0.5)
-    representable (3.0.4)
-      declarative (< 0.1.0)
-      declarative-option (< 0.2.0)
-      uber (< 0.2.0)
-    retriable (3.1.2)
-    rouge (2.0.7)
-    rubyzip (1.2.2)
-    security (0.1.3)
-    signet (0.11.0)
-      addressable (~> 2.3)
-      faraday (~> 0.9)
-      jwt (>= 1.5, < 3.0)
-      multi_json (~> 1.10)
-    simctl (1.6.5)
-      CFPropertyList
-      naturally
-    slack-notifier (2.3.2)
-    terminal-notifier (1.8.0)
-    terminal-table (1.8.0)
-      unicode-display_width (~> 1.1, >= 1.1.1)
-    tty-cursor (0.6.0)
-    tty-screen (0.6.5)
-    tty-spinner (0.9.0)
-      tty-cursor (~> 0.6.0)
-    uber (0.1.0)
-    unf (0.1.4)
-      unf_ext
-    unf_ext (0.0.7.5)
-    unicode-display_width (1.4.1)
-    word_wrap (1.0.0)
-    xcodeproj (1.8.1)
-      CFPropertyList (>= 2.3.3, < 4.0)
-      atomos (~> 0.1.3)
-      claide (>= 1.0.2, < 2.0)
-      colored2 (~> 3.1)
-      nanaimo (~> 0.2.6)
-    xcpretty (0.3.0)
-      rouge (~> 2.0.7)
-    xcpretty-travis-formatter (1.0.0)
-      xcpretty (~> 0.2, >= 0.0.7)
-
-PLATFORMS
-  ruby
-
-DEPENDENCIES
-  fastlane
-
-BUNDLED WITH
-   1.16.6

README.md

-# Introduction
+# random
 
-This is a template for doing Android development using GitLab and [fastlane](https://fastlane.tools/).
-It is based on the tutorial for Android apps in general that can be found [here](https://developer.android.com/training/basics/firstapp/). 
-If you're learning Android at the same time, you can also follow along that
-tutorial and learn how to do everything all at once.
 
-# Reference links
-
-- [GitLab CI Documentation](https://docs.gitlab.com/ee/ci/)
-- [Blog post: Android publishing with GitLab and fastlane](https://about.gitlab.com/2019/01/28/android-publishing-with-gitlab-and-fastlane/)
-
-You'll definitely want to read through the blog post since that walks you in detail
-through a working production configuration using this model.
-
-# Getting started
-
-First thing is to follow the [Android tutorial](https://developer.android.com/training/basics/firstapp/) and
-get Android Studio installed on your machine, so you can do development using
-the Android IDE. Other IDE options are possible, but not directly described or
-supported here. If you're using your own IDE, it should be fairly straightforward
-to convert these instructions to use with your preferred toolchain.
-
-## What's contained in this project
-
-### Android code
-
-The state of this project is as if you followed the first few steps in the linked
-[Android tutorial](https://developer.android.com/training/basics/firstapp/) and
-have created your project. You're definitely going to want to open up the
-project and change the settings to match what you plan to build. In particular,
-you're at least going to want to change the following:
-
-- Application Name: "My First App"
-- Company Domain: "example.com"
-
-### Fastlane files
-
-It also has fastlane setup per our [blog post](https://about.gitlab.com/2019/01/28/android-publishing-with-gitlab-and-fastlane/) on
-getting GitLab CI set up with fastlane. Note that you may want to update your
-fastlane bundle to the latest version; if a newer version is available, the pipeline
-job output will tell you.
-
-### Dockerfile build environment
-
-In the root there is a Dockerfile which defines a build environment which will be
-used to ensure consistent and reliable builds of your Android application using
-the correct Android SDK and other details you expect. Feel free to add any
-build-time tools or whatever else you need here.
-
-We generate this environment as needed because installing the Android SDK
-for every pipeline run would be very slow.
-
-### Gradle configuration
-
-The gradle configuration is exactly as output by Android Studio except for the
-version name being updated to 
-
-Instead of:
-
-`versionName "1.0"`
-
-It is now set to:
-
-`versionName "1.0-${System.env.VERSION_SHA}"`
-
-You'll want to update this for whatever versioning scheme you prefer.
-
-### Build configuration (`.gitlab-ci.yml`)
-
-The sample project also contains a basic `.gitlab-ci.yml` which will successfully 
-build the Android application.
-
-Note that for publishing to the test channels or production, you'll need to set
-up your secret API key. The stub code is here for that, but please see our
-[blog post](https://about.gitlab.com/2019/01/28/android-publishing-with-gitlab-and-fastlane/) for
-details on how to set this up completely. In the meantime, publishing steps will fail.
-
-The build script also handles automatic versioning by relying on the CI pipeline
-ID to generate a unique, ever increasing number. If you have a different versioning
-scheme you may want to change this.
-
-```yaml
-    - "export VERSION_CODE=$(($CI_PIPELINE_IID)) && echo $VERSION_CODE"
-    - "export VERSION_SHA=`echo ${CI_COMMIT_SHA:0:8}` && echo $VERSION_SHA"
-```
\ No newline at end of file

android-template.iml

-<?xml version="1.0" encoding="UTF-8"?>
-<module external.linked.project.id="android-template" external.linked.project.path="$MODULE_DIR$" external.root.project.path="$MODULE_DIR$" external.system.id="GRADLE" type="JAVA_MODULE" version="4">
-  <component name="FacetManager">
-    <facet type="java-gradle" name="Java-Gradle">
-      <configuration>
-        <option name="BUILD_FOLDER_PATH" value="$MODULE_DIR$/build" />
-        <option name="BUILDABLE" value="false" />
-      </configuration>
-    </facet>
-  </component>
-  <component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_7" inherit-compiler-output="true">
-    <exclude-output />
-    <content url="file://$MODULE_DIR$">
-      <excludeFolder url="file://$MODULE_DIR$/.gradle" />
-    </content>
-    <orderEntry type="inheritedJdk" />
-    <orderEntry type="sourceFolder" forTests="false" />
-  </component>
-</module>
\ No newline at end of file

android/.gitignore

+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/app/build.gradle

+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 from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
+
+android {
+    compileSdkVersion 30
+
+    defaultConfig {
+        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
+        applicationId "org.benoitharrault.random"
+        minSdkVersion 16
+        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 '../..'
+}

android/app/src/debug/AndroidManifest.xml

+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="org.benoitharrault.random">
+    <!-- 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/app/src/main/AndroidManifest.xml

+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="org.benoitharrault.random">
+   <application
+        android:label="random"
+        android:icon="@mipmap/ic_launcher">
+        <activity
+            android:name=".MainActivity"
+            android:launchMode="singleTop"
+            android:theme="@style/LaunchTheme"
+            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
+            android:hardwareAccelerated="true"
+            android:windowSoftInputMode="adjustResize">
+            <!-- Specifies an Android theme to apply to this Activity as soon as
+                 the Android process has started. This theme is visible to the user
+                 while the Flutter UI initializes. After that, this theme continues
+                 to determine the Window background behind the Flutter UI. -->
+            <meta-data
+              android:name="io.flutter.embedding.android.NormalTheme"
+              android:resource="@style/NormalTheme"
+              />
+            <!-- Displays an Android View that continues showing the launch screen
+                 Drawable until Flutter paints its first frame, then this splash
+                 screen fades out. A splash screen is useful to avoid any visual
+                 gap between the end of Android's launch screen and the painting of
+                 Flutter's first frame. -->
+            <meta-data
+              android:name="io.flutter.embedding.android.SplashScreenDrawable"
+              android:resource="@drawable/launch_background"
+              />
+            <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/app/src/main/java/org/benoitharrault/random/MainActivity.java

+package org.benoitharrault.random;
+
+import io.flutter.embedding.android.FlutterActivity;
+
+public class MainActivity extends FlutterActivity {
+}

android/app/src/main/res/drawable-v21/launch_background.xml

+<?xml version="1.0" encoding="utf-8"?>
+<!-- Modify this file to customize your launch splash screen -->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="?android:colorBackground" />
+
+    <!-- You can insert your own image assets here -->
+    <!-- <item>
+        <bitmap
+            android:gravity="center"
+            android:src="@mipmap/launch_image" />
+    </item> -->
+</layer-list>

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

+<?xml version="1.0" encoding="utf-8"?>
+<!-- Modify this file to customize your launch splash screen -->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="@android:color/white" />
+
+    <!-- You can insert your own image assets here -->
+    <!-- <item>
+        <bitmap
+            android:gravity="center"
+            android:src="@mipmap/launch_image" />
+    </item> -->
+</layer-list>