Missing classes detected while running R8解决

问题： AGPBI: {"kind":"error","text":"Missing classes detected while running R8. Please add the missing classes or apply additional keep rules that are generated in E:\jiuyin\nada_print\printer\build\outputs\mapping\debug\missing_rules.txt.","sources":[{}]} AGPBI: {"kind":"error","text":"Missing class java.lang.invoke.StringConcatFactory (referenced from: void com.zhuhaijiuyin.printer.bluetooth.instruction.BluetoothOperate$AcceptThread.<init>(com.zhuhaijiuyin.printer.bluetooth.instruction.BluetoothOperate, boolean) and 10 other contexts)","sources":[{}],"tool":"R8"} [Incubating] Problems report is available at: file:///E:/jiuyin/nada_print/build/reports/problems/problems-report.html
Missing classes detected while running R8. Please add the missing classes or apply additional keep rules that are generated in E:\jiuyin\nada_print\printer\build\outputs\mapping\debug\missing_rules.txt.
Missing class java.lang.invoke.StringConcatFactory (referenced from: void com.zhuhaijiuyin.printer.bluetooth.instruction.BluetoothOperate$AcceptThread.<init>(com.zhuhaijiuyin.printer.bluetooth.instruction.BluetoothOperate, boolean) and 10 other contexts)

解决办法：打开提示项目->build->outputs->mapping->mapping文件，复制到proguard-rules.pro里面即可