如何在Android中處理不同的JAVA版本？

Question

我與一些本地Java 8的功能（如λ）

我有兩個模塊（應用程序，在MyLibrary）

測試的Android 3.0工作室預覽我的應用程序build.gradle文件，我包括庫模塊。

implementation project(':mylibrary') 

在在MyLibrary build.gradle文件，我爲了測試lambda表達式指定的Java版本。

compileOptions { 
    android.compileOptions.sourceCompatibility 1.8 
    android.compileOptions.targetCompatibility 1.8 
} 

這是工作細到我，直到我從金絲雀3 android的工作室升級到金絲雀5，我的做法是壞了。

我得到了動態

Information:Gradle tasks [:app:assembleDebug] 
/Users/chchi/Documents/PayPal/Android/AS3.0Preview/app/src/main/java/com/example/chchi/myapplication/MainActivity.kt 
Error:Error converting bytecode to dex: 
Cause: invalid opcode ba (invokedynamic requires --min-sdk-version >= 26) 
Error:com.android.dx.cf.code.SimException: invalid opcode ba (invokedynamic requires --min-sdk-version >= 26) 
... 
... 
Error: ... 5 more 
Error:...at bytecode offset 00000016 
Error:locals[0000]: Lcom/android/tools/fd/runtime/IncrementalChange; 
Error:locals[0001]: <invalid> 
Error:...while working on block 0016 
Error:...while working on method testJava8feature:()V 
Error:...while processing testJava8feature()V 
Error:...while processing com/example/mylibrary/LamdaTest.class 
Error:Execution failed for task ':app:transformClassesWithDexBuilderForDebug'. 
> com.android.build.api.transform.TransformException: com.android.builder.dexing.DexArchiveBuilderException: com.android.builder.dexing.DexArchiveBuilderException: Unable to convert input to dex archive. 
Information:BUILD FAILED in 8s 
Information:40 errors 
Information:1 warning 
Information:See complete output in console 

以下錯誤消息我按照指示磕碰minSdkVersion到26後。我收到有關轉換爲dex文件的錯誤。

Information:Gradle tasks [:app:assembleDebug] 
Error:Error converting bytecode to dex: 
Cause: Shouldn't happen 
Error:com.android.dex.util.ExceptionWithContext: Shouldn't happen 
Error: at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) 
Error: at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) 
Error: at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) 
Error: at java.lang.reflect.Constructor.newInstance(Constructor.java:423) 
... 
Error:Caused by: com.android.dex.util.ExceptionWithContext: Shouldn't happen 
Error: at com.android.dex.util.ExceptionWithContext.withContext(ExceptionWithContext.java:45) 
Error: at com.android.dx.dex.file.MixedItemSection.placeItems(MixedItemSection.java:320) 
Error: at com.android.dx.dex.file.DexFile.toDex0(DexFile.java:611) 
Error: at com.android.dx.dex.file.DexFile.toDex(DexFile.java:242) 
Error: at com.android.builder.dexing.DxDexArchiveBuilder.lambda$processJobChunk$0(DxDexArchiveBuilder.java:118) 
Error: ... 5 more 
Error:Caused by: java.lang.RuntimeException: Shouldn't happen 
Error: at com.android.dx.dex.file.ValueEncoder.constantToValueType(ValueEncoder.java:276) 
Error: at com.android.dx.dex.file.ValueEncoder.writeConstant(ValueEncoder.java:137) 
Error: at com.android.dx.dex.file.ValueEncoder.writeArray(ValueEncoder.java:310) 
Error: at com.android.dx.dex.file.CallSiteItem.place0(CallSiteItem.java:63) 
Error: at com.android.dx.dex.file.OffsettedItem.place(OffsettedItem.java:242) 
Error: at com.android.dx.dex.file.MixedItemSection.placeItems(MixedItemSection.java:311) 
Error: ... 8 more 
Error:...while placing call site{method-handle{invoke-static,method{java.lang.invoke.LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;}}, string{"adder"}, proto{()Lcom/example/mylibrary/PayPalInterface;}, (II)V, method-handle{invoke-static,method{com.example.mylibrary.LamdaTest.lambda$testJava8feature$0:(II)V}}, (II)V} 
Error:...while writing section 12 
Error:Execution failed for task ':app:transformClassesWithDexBuilderForDebug'. 
> com.android.build.api.transform.TransformException: com.android.builder.dexing.DexArchiveBuilderException: com.android.builder.dexing.DexArchiveBuilderException: Unable to convert input to dex archive. 
Information:BUILD FAILED in 1s 
Information:38 errors 
Information:0 warnings 
Information:See complete output in console 

最後，我不得不碰撞和針對我的所有模塊1.8（無需設置minSdkVersion到26）爲了讓編譯過程。有沒有辦法讓我的圖書館模塊只使用1.8，誰使用我的圖書館仍然可以留在他們現在的位置（1.7）？

如果我只使用具有high backward compatibility的某些功能，那麼爲什麼我應該擔心是否使用我的庫目標到1.8？

Answer 1

這是新的Android Gradle插件的bug - 我面臨與我的圖書館項目相同的問題。似乎desugar - 將Java 8字節碼轉換爲舊字節碼 - 不適用於庫項目。

我已向Google報告問題。希望它修復。 https://issuetracker.google.com/issues/63513242