译：收缩器可能未能优化Java字节码。
[!] The shrinker may have failed to optimize the Java bytecode.
To disable the shrinker, pass the `--no-shrink` flag to this command.
To learn more, see: https://developer.android.com/studio/build/shrink-code
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解决：
Here is the process of how to fix this.
1: Change some codes in located to thisandroid/app/build.gradle
buildTypes {
debug {
minifyEnabled true
// 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
}
}
2: Change minSdkVersion 16 to 21
defaultConfig {
// TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
applicationId "com.company.appname"
minSdkVersion 21
targetSdkVersion 29
versionCode flutterVersionCode.toInteger()
versionName flutterVersionName
}
