flutter 提示 Cannot fit requested classes in a single dex file 的解决方案

flutter 项目运行后提示

Error: Cannot fit requested classes in a single dex file (# methods: 72725 > 65536)

解决办法：

找到 android/app/build.gradle 修改最小的sdk为21 minSdkVersion 21

 defaultConfig {
        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
        applicationId "com.example.flutter_app02"
        minSdkVersion 21
        targetSdkVersion 29
     
		.....
		
 }