From 6a954dd3493d116afdb3751532befe51e4615433 Mon Sep 17 00:00:00 2001
From: Sushan Shakya <53656009+SushanShakya@users.noreply.github.com>
Date: Sun, 23 Oct 2022 00:18:44 +0545
Subject: [PATCH] New Example - Biometrics (#119)
---
biometrics/.gitignore | 46 ++++++++
biometrics/.metadata | 10 ++
biometrics/LICENSE | 21 ++++
biometrics/README.md | 16 +++
biometrics/analysis_options.yaml | 29 +++++
biometrics/android/.gitignore | 13 +++
biometrics/android/app/build.gradle | 68 ++++++++++++
.../android/app/src/debug/AndroidManifest.xml | 7 ++
.../android/app/src/main/AndroidManifest.xml | 34 ++++++
.../studio/sdev/biometrics/MainActivity.kt | 5 +
.../res/drawable-v21/launch_background.xml | 12 +++
.../main/res/drawable/launch_background.xml | 12 +++
.../src/main/res/mipmap-hdpi/ic_launcher.png | Bin 0 -> 544 bytes
.../src/main/res/mipmap-mdpi/ic_launcher.png | Bin 0 -> 442 bytes
.../src/main/res/mipmap-xhdpi/ic_launcher.png | Bin 0 -> 721 bytes
.../main/res/mipmap-xxhdpi/ic_launcher.png | Bin 0 -> 1031 bytes
.../main/res/mipmap-xxxhdpi/ic_launcher.png | Bin 0 -> 1443 bytes
.../app/src/main/res/values-night/styles.xml | 18 ++++
.../app/src/main/res/values/styles.xml | 18 ++++
.../app/src/profile/AndroidManifest.xml | 7 ++
biometrics/android/build.gradle | 31 ++++++
biometrics/android/gradle.properties | 3 +
.../gradle/wrapper/gradle-wrapper.properties | 6 ++
biometrics/android/settings.gradle | 11 ++
biometrics/lib/biometrics_verifier.dart | 34 ++++++
biometrics/lib/main.dart | 99 ++++++++++++++++++
biometrics/pubspec.yaml | 90 ++++++++++++++++
27 files changed, 590 insertions(+)
create mode 100644 biometrics/.gitignore
create mode 100644 biometrics/.metadata
create mode 100644 biometrics/LICENSE
create mode 100644 biometrics/README.md
create mode 100644 biometrics/analysis_options.yaml
create mode 100644 biometrics/android/.gitignore
create mode 100644 biometrics/android/app/build.gradle
create mode 100644 biometrics/android/app/src/debug/AndroidManifest.xml
create mode 100644 biometrics/android/app/src/main/AndroidManifest.xml
create mode 100644 biometrics/android/app/src/main/kotlin/studio/sdev/biometrics/MainActivity.kt
create mode 100644 biometrics/android/app/src/main/res/drawable-v21/launch_background.xml
create mode 100644 biometrics/android/app/src/main/res/drawable/launch_background.xml
create mode 100644 biometrics/android/app/src/main/res/mipmap-hdpi/ic_launcher.png
create mode 100644 biometrics/android/app/src/main/res/mipmap-mdpi/ic_launcher.png
create mode 100644 biometrics/android/app/src/main/res/mipmap-xhdpi/ic_launcher.png
create mode 100644 biometrics/android/app/src/main/res/mipmap-xxhdpi/ic_launcher.png
create mode 100644 biometrics/android/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png
create mode 100644 biometrics/android/app/src/main/res/values-night/styles.xml
create mode 100644 biometrics/android/app/src/main/res/values/styles.xml
create mode 100644 biometrics/android/app/src/profile/AndroidManifest.xml
create mode 100644 biometrics/android/build.gradle
create mode 100644 biometrics/android/gradle.properties
create mode 100644 biometrics/android/gradle/wrapper/gradle-wrapper.properties
create mode 100644 biometrics/android/settings.gradle
create mode 100644 biometrics/lib/biometrics_verifier.dart
create mode 100644 biometrics/lib/main.dart
create mode 100644 biometrics/pubspec.yaml
diff --git a/biometrics/.gitignore b/biometrics/.gitignore
new file mode 100644
index 00000000..0fa6b675
--- /dev/null
+++ b/biometrics/.gitignore
@@ -0,0 +1,46 @@
+# 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
diff --git a/biometrics/.metadata b/biometrics/.metadata
new file mode 100644
index 00000000..3c3e4b52
--- /dev/null
+++ b/biometrics/.metadata
@@ -0,0 +1,10 @@
+# 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: 5464c5bac742001448fe4fc0597be939379f88ea
+ channel: stable
+
+project_type: app
diff --git a/biometrics/LICENSE b/biometrics/LICENSE
new file mode 100644
index 00000000..cafdb1ba
--- /dev/null
+++ b/biometrics/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2022 Sushan Shakya
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/biometrics/README.md b/biometrics/README.md
new file mode 100644
index 00000000..2d1ef28f
--- /dev/null
+++ b/biometrics/README.md
@@ -0,0 +1,16 @@
+# biometrics
+
+A new Flutter project.
+
+## Getting Started
+
+This project is a starting point for a Flutter application.
+
+A few resources to get you started if this is your first Flutter project:
+
+- [Lab: Write your first Flutter app](https://flutter.dev/docs/get-started/codelab)
+- [Cookbook: Useful Flutter samples](https://flutter.dev/docs/cookbook)
+
+For help getting started with Flutter, view our
+[online documentation](https://flutter.dev/docs), which offers tutorials,
+samples, guidance on mobile development, and a full API reference.
diff --git a/biometrics/analysis_options.yaml b/biometrics/analysis_options.yaml
new file mode 100644
index 00000000..61b6c4de
--- /dev/null
+++ b/biometrics/analysis_options.yaml
@@ -0,0 +1,29 @@
+# This file configures the analyzer, which statically analyzes Dart code to
+# check for errors, warnings, and lints.
+#
+# The issues identified by the analyzer are surfaced in the UI of Dart-enabled
+# IDEs (https://dart.dev/tools#ides-and-editors). The analyzer can also be
+# invoked from the command line by running `flutter analyze`.
+
+# The following line activates a set of recommended lints for Flutter apps,
+# packages, and plugins designed to encourage good coding practices.
+include: package:flutter_lints/flutter.yaml
+
+linter:
+ # The lint rules applied to this project can be customized in the
+ # section below to disable rules from the `package:flutter_lints/flutter.yaml`
+ # included above or to enable additional rules. A list of all available lints
+ # and their documentation is published at
+ # https://dart-lang.github.io/linter/lints/index.html.
+ #
+ # Instead of disabling a lint rule for the entire project in the
+ # section below, it can also be suppressed for a single line of code
+ # or a specific dart file by using the `// ignore: name_of_lint` and
+ # `// ignore_for_file: name_of_lint` syntax on the line or in the file
+ # producing the lint.
+ rules:
+ # avoid_print: false # Uncomment to disable the `avoid_print` rule
+ # prefer_single_quotes: true # Uncomment to enable the `prefer_single_quotes` rule
+
+# Additional information about this file can be found at
+# https://dart.dev/guides/language/analysis-options
diff --git a/biometrics/android/.gitignore b/biometrics/android/.gitignore
new file mode 100644
index 00000000..6f568019
--- /dev/null
+++ b/biometrics/android/.gitignore
@@ -0,0 +1,13 @@
+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
+**/*.keystore
+**/*.jks
diff --git a/biometrics/android/app/build.gradle b/biometrics/android/app/build.gradle
new file mode 100644
index 00000000..4e013d31
--- /dev/null
+++ b/biometrics/android/app/build.gradle
@@ -0,0 +1,68 @@
+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: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
+
+android {
+ compileSdkVersion flutter.compileSdkVersion
+
+ compileOptions {
+ sourceCompatibility JavaVersion.VERSION_1_8
+ targetCompatibility JavaVersion.VERSION_1_8
+ }
+
+ kotlinOptions {
+ jvmTarget = '1.8'
+ }
+
+ sourceSets {
+ main.java.srcDirs += 'src/main/kotlin'
+ }
+
+ defaultConfig {
+ // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
+ applicationId "studio.sdev.biometrics"
+ minSdkVersion flutter.minSdkVersion
+ targetSdkVersion flutter.targetSdkVersion
+ versionCode flutterVersionCode.toInteger()
+ versionName flutterVersionName
+ }
+
+ buildTypes {
+ release {
+ // TODO: Add your own signing config for the release build.
+ // Signing with the debug keys for now, so `flutter run --release` works.
+ signingConfig signingConfigs.debug
+ }
+ }
+}
+
+flutter {
+ source '../..'
+}
+
+dependencies {
+ implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+}
diff --git a/biometrics/android/app/src/debug/AndroidManifest.xml b/biometrics/android/app/src/debug/AndroidManifest.xml
new file mode 100644
index 00000000..02d07602
--- /dev/null
+++ b/biometrics/android/app/src/debug/AndroidManifest.xml
@@ -0,0 +1,7 @@
+
+
+
+
diff --git a/biometrics/android/app/src/main/AndroidManifest.xml b/biometrics/android/app/src/main/AndroidManifest.xml
new file mode 100644
index 00000000..9df128ef
--- /dev/null
+++ b/biometrics/android/app/src/main/AndroidManifest.xml
@@ -0,0 +1,34 @@
+
+
+
+
+
+
+
+
+
+
+
+
+
+
diff --git a/biometrics/android/app/src/main/kotlin/studio/sdev/biometrics/MainActivity.kt b/biometrics/android/app/src/main/kotlin/studio/sdev/biometrics/MainActivity.kt
new file mode 100644
index 00000000..c1719e07
--- /dev/null
+++ b/biometrics/android/app/src/main/kotlin/studio/sdev/biometrics/MainActivity.kt
@@ -0,0 +1,5 @@
+package studio.sdev.biometrics
+
+import io.flutter.embedding.android.FlutterFragmentActivity
+class MainActivity: FlutterFragmentActivity() {
+}
diff --git a/biometrics/android/app/src/main/res/drawable-v21/launch_background.xml b/biometrics/android/app/src/main/res/drawable-v21/launch_background.xml
new file mode 100644
index 00000000..f74085f3
--- /dev/null
+++ b/biometrics/android/app/src/main/res/drawable-v21/launch_background.xml
@@ -0,0 +1,12 @@
+
+
+
+
+
+
+
+
diff --git a/biometrics/android/app/src/main/res/drawable/launch_background.xml b/biometrics/android/app/src/main/res/drawable/launch_background.xml
new file mode 100644
index 00000000..304732f8
--- /dev/null
+++ b/biometrics/android/app/src/main/res/drawable/launch_background.xml
@@ -0,0 +1,12 @@
+
+
+
+
+
+
+
+
diff --git a/biometrics/android/app/src/main/res/mipmap-hdpi/ic_launcher.png b/biometrics/android/app/src/main/res/mipmap-hdpi/ic_launcher.png
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diff --git a/biometrics/android/app/src/main/res/values-night/styles.xml b/biometrics/android/app/src/main/res/values-night/styles.xml
new file mode 100644
index 00000000..3db14bb5
--- /dev/null
+++ b/biometrics/android/app/src/main/res/values-night/styles.xml
@@ -0,0 +1,18 @@
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+
+
+
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diff --git a/biometrics/android/app/src/main/res/values/styles.xml b/biometrics/android/app/src/main/res/values/styles.xml
new file mode 100644
index 00000000..d460d1e9
--- /dev/null
+++ b/biometrics/android/app/src/main/res/values/styles.xml
@@ -0,0 +1,18 @@
+
+
+
+
+
+
+
diff --git a/biometrics/android/app/src/profile/AndroidManifest.xml b/biometrics/android/app/src/profile/AndroidManifest.xml
new file mode 100644
index 00000000..02d07602
--- /dev/null
+++ b/biometrics/android/app/src/profile/AndroidManifest.xml
@@ -0,0 +1,7 @@
+
+
+
+
diff --git a/biometrics/android/build.gradle b/biometrics/android/build.gradle
new file mode 100644
index 00000000..4256f917
--- /dev/null
+++ b/biometrics/android/build.gradle
@@ -0,0 +1,31 @@
+buildscript {
+ ext.kotlin_version = '1.6.10'
+ repositories {
+ google()
+ mavenCentral()
+ }
+
+ dependencies {
+ classpath 'com.android.tools.build:gradle:4.1.0'
+ classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+ }
+}
+
+allprojects {
+ repositories {
+ google()
+ mavenCentral()
+ }
+}
+
+rootProject.buildDir = '../build'
+subprojects {
+ project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
+ project.evaluationDependsOn(':app')
+}
+
+task clean(type: Delete) {
+ delete rootProject.buildDir
+}
diff --git a/biometrics/android/gradle.properties b/biometrics/android/gradle.properties
new file mode 100644
index 00000000..94adc3a3
--- /dev/null
+++ b/biometrics/android/gradle.properties
@@ -0,0 +1,3 @@
+org.gradle.jvmargs=-Xmx1536M
+android.useAndroidX=true
+android.enableJetifier=true
diff --git a/biometrics/android/gradle/wrapper/gradle-wrapper.properties b/biometrics/android/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 00000000..bc6a58af
--- /dev/null
+++ b/biometrics/android/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,6 @@
+#Fri Jun 23 08:50:38 CEST 2017
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.7-all.zip
diff --git a/biometrics/android/settings.gradle b/biometrics/android/settings.gradle
new file mode 100644
index 00000000..44e62bcf
--- /dev/null
+++ b/biometrics/android/settings.gradle
@@ -0,0 +1,11 @@
+include ':app'
+
+def localPropertiesFile = new File(rootProject.projectDir, "local.properties")
+def properties = new Properties()
+
+assert localPropertiesFile.exists()
+localPropertiesFile.withReader("UTF-8") { reader -> properties.load(reader) }
+
+def flutterSdkPath = properties.getProperty("flutter.sdk")
+assert flutterSdkPath != null, "flutter.sdk not set in local.properties"
+apply from: "$flutterSdkPath/packages/flutter_tools/gradle/app_plugin_loader.gradle"
diff --git a/biometrics/lib/biometrics_verifier.dart b/biometrics/lib/biometrics_verifier.dart
new file mode 100644
index 00000000..256e9bc5
--- /dev/null
+++ b/biometrics/lib/biometrics_verifier.dart
@@ -0,0 +1,34 @@
+import 'package:flutter/services.dart';
+import 'package:local_auth/local_auth.dart';
+
+class BiometricsVerifier {
+ late LocalAuthentication auth;
+
+ BiometricsVerifier() {
+ auth = LocalAuthentication();
+ }
+
+ Future _ableToAuthenticate() async {
+ bool supported = await auth.canCheckBiometrics;
+ bool entryExists = await auth.isDeviceSupported();
+ if (!supported) throw "Device doesn't support Biometrics.";
+ if (!entryExists) throw "Biometric entry not found in phone.";
+ }
+
+ Future verifyBiometrics(String? prompt) async {
+ await _ableToAuthenticate();
+ late bool didAuthenticate;
+ try {
+ didAuthenticate = await auth.authenticate(
+ localizedReason: prompt ?? 'Please authenticate with biometrics',
+ options: const AuthenticationOptions(
+ stickyAuth: true,
+ biometricOnly: true,
+ ),
+ );
+ } on PlatformException {
+ throw "Platform Exception : Biometrics Failed !";
+ }
+ if (!didAuthenticate) throw "Biometrics Failed";
+ }
+}
diff --git a/biometrics/lib/main.dart b/biometrics/lib/main.dart
new file mode 100644
index 00000000..3e32195f
--- /dev/null
+++ b/biometrics/lib/main.dart
@@ -0,0 +1,99 @@
+import 'package:biometrics/biometrics_verifier.dart';
+import 'package:flutter/material.dart';
+
+void main() => runApp(Biometrics());
+
+class Biometrics extends StatelessWidget {
+ @override
+ Widget build(BuildContext context) {
+ return MaterialApp(
+ title: 'Biometrics',
+ theme: ThemeData(
+ appBarTheme: const AppBarTheme(elevation: 0),
+ ),
+ home: Home(),
+ );
+ }
+}
+
+class Home extends StatefulWidget {
+ @override
+ State createState() => _HomeState();
+}
+
+class _HomeState extends State {
+ late bool isVerified;
+
+ late BiometricsVerifier verifier;
+
+ @override
+ void initState() {
+ super.initState();
+ isVerified = false;
+ verifier = BiometricsVerifier();
+ }
+
+ @override
+ Widget build(BuildContext context) {
+ return Scaffold(
+ appBar: AppBar(),
+ body: SizedBox(
+ width: double.infinity,
+ child: Column(
+ mainAxisAlignment: MainAxisAlignment.center,
+ children: [
+ Text(
+ isVerified ? 'Verification Complete' : 'Unverified',
+ style: const TextStyle(
+ fontSize: 16,
+ fontWeight: FontWeight.bold,
+ ),
+ ),
+ const SizedBox(height: 10),
+ isVerified
+ ? TextButton(
+ onPressed: () {
+ setState(() {
+ isVerified = false;
+ });
+ },
+ child: const Text('Unverify'),
+ )
+ : TextButton(
+ onPressed: () async {
+ try {
+ await verifier
+ .verifyBiometrics('Please enter your fingerprint');
+ // ---- Add your logic after finger print verification here
+ // ---
+ // ---
+ setState(() {
+ isVerified = true;
+ });
+ } catch (e) {
+ // ---- Verification Failed
+ showDialog(
+ context: context,
+ builder: (c) => AlertDialog(
+ title: const Text('Error !'),
+ content: Text(e.toString()),
+ actions: [
+ TextButton(
+ onPressed: () {
+ Navigator.of(context).pop();
+ },
+ child: const Text('Ok'),
+ )
+ ],
+ ),
+ );
+ }
+ },
+ child: const Text('Verify with Fingerprint'),
+ ),
+ ],
+ ),
+ ),
+ );
+ }
+}
diff --git a/biometrics/pubspec.yaml b/biometrics/pubspec.yaml
new file mode 100644
index 00000000..c767ab49
--- /dev/null
+++ b/biometrics/pubspec.yaml
@@ -0,0 +1,90 @@
+name: biometrics
+description: A new Flutter project.
+
+# The following line prevents the package from being accidentally published to
+# pub.dev using `flutter pub publish`. This is preferred for private packages.
+publish_to: 'none' # Remove this line if you wish to publish to pub.dev
+
+# The following defines the version and build number for your application.
+# A version number is three numbers separated by dots, like 1.2.43
+# followed by an optional build number separated by a +.
+# Both the version and the builder number may be overridden in flutter
+# build by specifying --build-name and --build-number, respectively.
+# In Android, build-name is used as versionName while build-number used as versionCode.
+# Read more about Android versioning at https://developer.android.com/studio/publish/versioning
+# In iOS, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion.
+# Read more about iOS versioning at
+# https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
+version: 1.0.0+1
+
+environment:
+ sdk: ">=2.16.2 <3.0.0"
+
+# Dependencies specify other packages that your package needs in order to work.
+# To automatically upgrade your package dependencies to the latest versions
+# consider running `flutter pub upgrade --major-versions`. Alternatively,
+# dependencies can be manually updated by changing the version numbers below to
+# the latest version available on pub.dev. To see which dependencies have newer
+# versions available, run `flutter pub outdated`.
+dependencies:
+ flutter:
+ sdk: flutter
+
+
+ # The following adds the Cupertino Icons font to your application.
+ # Use with the CupertinoIcons class for iOS style icons.
+ cupertino_icons: ^1.0.2
+ local_auth: ^2.1.2
+
+dev_dependencies:
+ flutter_test:
+ sdk: flutter
+
+ # The "flutter_lints" package below contains a set of recommended lints to
+ # encourage good coding practices. The lint set provided by the package is
+ # activated in the `analysis_options.yaml` file located at the root of your
+ # package. See that file for information about deactivating specific lint
+ # rules and activating additional ones.
+ flutter_lints: ^1.0.0
+
+# For information on the generic Dart part of this file, see the
+# following page: https://dart.dev/tools/pub/pubspec
+
+# The following section is specific to Flutter.
+flutter:
+
+ # The following line ensures that the Material Icons font is
+ # included with your application, so that you can use the icons in
+ # the material Icons class.
+ uses-material-design: true
+
+ # To add assets to your application, add an assets section, like this:
+ # assets:
+ # - images/a_dot_burr.jpeg
+ # - images/a_dot_ham.jpeg
+
+ # An image asset can refer to one or more resolution-specific "variants", see
+ # https://flutter.dev/assets-and-images/#resolution-aware.
+
+ # For details regarding adding assets from package dependencies, see
+ # https://flutter.dev/assets-and-images/#from-packages
+
+ # To add custom fonts to your application, add a fonts section here,
+ # in this "flutter" section. Each entry in this list should have a
+ # "family" key with the font family name, and a "fonts" key with a
+ # list giving the asset and other descriptors for the font. For
+ # example:
+ # fonts:
+ # - family: Schyler
+ # fonts:
+ # - asset: fonts/Schyler-Regular.ttf
+ # - asset: fonts/Schyler-Italic.ttf
+ # style: italic
+ # - family: Trajan Pro
+ # fonts:
+ # - asset: fonts/TrajanPro.ttf
+ # - asset: fonts/TrajanPro_Bold.ttf
+ # weight: 700
+ #
+ # For details regarding fonts from package dependencies,
+ # see https://flutter.dev/custom-fonts/#from-packages