错误1：
FAILURE: Build failed with an exception. * What went wrong: Execution failed for task ':audioplayers_android:compileDebugKotlin'. > Inconsistent JVM-target compatibility detected for tasks 'compileDebugJavaWithJavac' (1.8) and 'compileDebugKotlin' (21). Consider using JVM Toolchain: https://kotl.in/gradle/jvm/toolchain Learn more about JVM-target validation: https://kotl.in/gradle/jvm/target-validation
* 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 1s
错误2:
FAILURE: Build failed with an exception.
* What went wrong:
Could not determine the dependencies of task ':audioplayers_android:compileDebugKotlin'.
> Unknown Kotlin JVM target: 21
* 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 1s
解决方案：
1.首先找到依赖项目的路径：
audioplayers: ^4.1.0 存放路径
On Windows:
C:\Users\<Your-Username>\AppData\Local\Pub\Cache\hosted\pub.dev\audioplayers-4.1.0
On macOS/Linux:
~/.pub-cache/hosted/pub.dev/audioplayers-4.1.0
实际我的路径是：~/.pub-cache/hosted/pub.flutter-io.cn/audioplayers-4.1.0
audioplayers-4.1.0对应的依赖：
查看pubspec.yaml中的：
修改同目录下audioplayers_android-3.0.2/android/build.gradle
添加：
android{
...
...
compileOptions {
sourceCompatibility = 21
targetCompatibility = 21
}
kotlinOptions {
jvmTarget = '21'
}
}