Why did I get an error by adding TextToSpeech? - flutter

Question

I tried to intigrate a text to speech Funktion in my (Flutter) app, but if I write flutter_tts: ^0.8.6 under dependencies:, how I saw it in a tutorial, I get an error.
That´s the Code in the pubspec.yaml:
dependencies:
flutter_tts: ^0.8.6
flutter:
sdk: flutter
# The following adds the Cupertino Icons font to your application.
# Use with the CupertinoIcons class for iOS style icons.
cupertino_icons: ^0.1.2
dev_dependencies:
flutter_test:
sdk: flutter
and this is the error:
C:\Users\...\Desktop\tts_app\android\app\src\debug\AndroidManifest.xml Error:
uses-sdk:minSdkVersion 16 cannot be smaller than version 21 declared in library [:flutter_tts] C:\Users\...\Desktop\tts_app\build\flutter_tts\intermediates\library_manifest\debug\AndroidManifest.xml as the library might be using APIs not available in 16
Suggestion: use a compatible library with a minSdk of at most 16,
or increase this project's minSdk version to at least 21,
or use tools:overrideLibrary="com.tundralabs.fluttertts" to force usage (may lead to runtime failures)
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':app:processDebugManifest'.
> Manifest merger failed : uses-sdk:minSdkVersion 16 cannot be smaller than version 21 declared in library [:flutter_tts] C:\Users\Simon\Desktop\App Entwickeln\Projekte\tts_app\build\flutter_tts\intermediates\library_manifest\debug\AndroidManifest.xml as the library might be using APIs not available in 16
Suggestion: use a compatible library with a minSdk of at most 16,
or increase this project's minSdk version to at least 21,
or use tools:overrideLibrary="com.tundralabs.fluttertts" to force usage (may lead to runtime failures)
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
Get more help at https://help.gradle.org
BUILD FAILED in 3s
Finished with error: Gradle task assembleDebug failed with exit code 1

Answer 1

TTS Plugin needs your android version to be greater than API Level 21.
but in the
Android/app/build.gradle
file that value is still 16.
change it to 21 as following and you will be ok.
defaultConfig {
applicationId "com.example.eventtweb"
minSdkVersion 21
targetSdkVersion 28
versionCode flutterVersionCode.toInteger()
versionName flutterVersionName
}