如何解决Android Gradle Build Plugin 4.0.0和R8 Desugaring无法在API 19上运行
我正在将Android应用程序从使用Proguard的除糖处理切换到Android Gradle Build Plugin 4.0.0中可用的新R8除糖处理。
我已按照in the official documentation详细的步骤启用Java 8库调试功能:
gradle.properties
projectJavaVersion = 1.8
android.useAndroidX=true
android.enableJetifier=true
应用程序build.gradle
plugins {
id 'com.android.application'
id 'kotlin-android'
}
android {
buildToolsVersion '29.0.2'
compileSdkVersion 29
compileOptions {
coreLibraryDesugaringEnabled true
sourceCompatibility projectJavaVersion
targetCompatibility projectJavaVersion
}
kotlinOptions {
jvmTarget = projectJavaVersion
}
defaultConfig {
multiDexEnabled true
minSdkVersion 19
targetSdkVersion 23
applicationId = 'com.example.app'
}
buildTypes {
release {
...
minifyEnabled true
}
debug {
debuggable true
minifyEnabled true
}
}
}
dependencies {
coreLibraryDesugaring "com.android.tools:desugar_jdk_libs:1.0.10"
...
}
您可以看到我们至少支持API 19。没有构建错误(使用Gradle 6.1.1),但是有以下警告:
Warning in synthesized for lambda desugaring:
Type `j$.$r8$wrapper$java$util$function$Function$-V-WRP` was not found,it is required for default or static interface methods desugaring of `java.util.Comparator java.time.chrono.-$$Lambda$AbstractChronology$j22w8kHhJoqCd56hhLQK1G0VLFw.thenComparing($-vivified-$.java.util.function.Function)`
Warning in synthesized for lambda desugaring:
Type `j$.$r8$wrapper$java$util$function$ToLongFunction$-V-WRP` was not found,it is required for default or static interface methods desugaring of `java.util.Comparator java.time.chrono.-$$Lambda$AbstractChronology$j22w8kHhJoqCd56hhLQK1G0VLFw.thenComparingLong($-vivified-$.java.util.function.ToLongFunction)`
Warning in synthesized for lambda desugaring:
Type `j$.$r8$wrapper$java$util$function$ToDoubleFunction$-V-WRP` was not found,it is required for default or static interface methods desugaring of `java.util.Comparator java.time.chrono.-$$Lambda$AbstractChronology$j22w8kHhJoqCd56hhLQK1G0VLFw.thenComparingDouble($-vivified-$.java.util.function.ToDoubleFunction)`
Warning in synthesized for lambda desugaring:
Type `j$.$r8$wrapper$java$util$function$ToIntFunction$-V-WRP` was not found,it is required for default or static interface methods desugaring of `java.util.Comparator java.time.chrono.-$$Lambda$AbstractChronology$j22w8kHhJoqCd56hhLQK1G0VLFw.thenComparingInt($-vivified-$.java.util.function.ToIntFunction)`
Warning in /Users/username/.gradle/caches/modules-2/files-2.1/com.android.tools/desugar_jdk_libs/1.0.4/961afbdb3d41eebfb63b8c8ccdc97453b869964e/desugar_jdk_libs-1.0.4.jar:java/util/concurrent/ConcurrentHashMap$EntryIterator.class:
Type `j$.$r8$wrapper$java$util$function$Consumer$-V-WRP` was not found,it is required for default or static interface methods desugaring of `void java.util.concurrent.ConcurrentHashMap$EntryIterator.forEachRemaining($-vivified-$.java.util.function.Consumer)`
Warning in /Users/username/.gradle/caches/modules-2/files-2.1/com.android.tools/desugar_jdk_libs/1.0.4/961afbdb3d41eebfb63b8c8ccdc97453b869964e/desugar_jdk_libs-1.0.4.jar:java/util/concurrent/ConcurrentHashMap$CollectionView.class:
Type `j$.$r8$wrapper$java$util$stream$Stream$-WRP` was not found,it is required for default or static interface methods desugaring of `$-vivified-$.java.util.stream.Stream java.util.concurrent.ConcurrentHashMap$CollectionView.parallelStream()`
Warning in /Users/username/.gradle/caches/modules-2/files-2.1/com.android.tools/desugar_jdk_libs/1.0.4/961afbdb3d41eebfb63b8c8ccdc97453b869964e/desugar_jdk_libs-1.0.4.jar:java/util/concurrent/ConcurrentHashMap$CollectionView.class:
Type `j$.$r8$wrapper$java$util$Spliterator$-WRP` was not found,it is required for default or static interface methods desugaring of `$-vivified-$.java.util.Spliterator java.util.concurrent.ConcurrentHashMap$CollectionView.spliterator()`
Warning in /Users/username/.gradle/caches/modules-2/files-2.1/com.android.tools/desugar_jdk_libs/1.0.4/961afbdb3d41eebfb63b8c8ccdc97453b869964e/desugar_jdk_libs-1.0.4.jar:java/util/concurrent/ConcurrentHashMap$CollectionView.class:
Type `j$.$r8$wrapper$java$util$function$Predicate$-V-WRP` was not found,it is required for default or static interface methods desugaring of `boolean java.util.concurrent.ConcurrentHashMap$CollectionView.removeIf($-vivified-$.java.util.function.Predicate)`
Warning in /Users/username/.gradle/caches/modules-2/files-2.1/com.android.tools/desugar_jdk_libs/1.0.4/961afbdb3d41eebfb63b8c8ccdc97453b869964e/desugar_jdk_libs-1.0.4.jar:java/util/DesugarCollections$SynchronizedMap.class:
Type `j$.$r8$wrapper$java$util$function$BiFunction$-V-WRP` was not found,it is required for default or static interface methods desugaring of `void java.util.DesugarCollections$SynchronizedMap.replaceAll($-vivified-$.java.util.function.BiFunction)`
Warning in /Users/username/.gradle/caches/modules-2/files-2.1/com.android.tools/desugar_jdk_libs/1.0.4/961afbdb3d41eebfb63b8c8ccdc97453b869964e/desugar_jdk_libs-1.0.4.jar:java/util/DesugarCollections$SynchronizedMap.class:
Type `j$.$r8$wrapper$java$util$function$BiConsumer$-V-WRP` was not found,it is required for default or static interface methods desugaring of `void java.util.DesugarCollections$SynchronizedMap.forEach($-vivified-$.java.util.function.BiConsumer)`
Warning in /Users/username/.gradle/caches/modules-2/files-2.1/com.android.tools/desugar_jdk_libs/1.0.4/961afbdb3d41eebfb63b8c8ccdc97453b869964e/desugar_jdk_libs-1.0.4.jar:java/util/concurrent/ThreadLocalRandom.class:
Type `j$.$r8$wrapper$java$util$stream$IntStream$-WRP` was not found,it is required for default or static interface methods desugaring of `$-vivified-$.java.util.stream.IntStream java.util.concurrent.ThreadLocalRandom.ints()`
Warning in /Users/username/.gradle/caches/modules-2/files-2.1/com.android.tools/desugar_jdk_libs/1.0.4/961afbdb3d41eebfb63b8c8ccdc97453b869964e/desugar_jdk_libs-1.0.4.jar:java/util/concurrent/ThreadLocalRandom.class:
Type `j$.$r8$wrapper$java$util$stream$LongStream$-WRP` was not found,it is required for default or static interface methods desugaring of `$-vivified-$.java.util.stream.LongStream java.util.concurrent.ThreadLocalRandom.longs()`
Warning in /Users/username/.gradle/caches/modules-2/files-2.1/com.android.tools/desugar_jdk_libs/1.0.4/961afbdb3d41eebfb63b8c8ccdc97453b869964e/desugar_jdk_libs-1.0.4.jar:java/util/concurrent/ThreadLocalRandom.class:
Type `j$.$r8$wrapper$java$util$stream$DoubleStream$-WRP` was not found,it is required for default or static interface methods desugaring of `$-vivified-$.java.util.stream.DoubleStream java.util.concurrent.ThreadLocalRandom.doubles(long)`
Warning: Type `java.util.OptionalConversions` was not found,it is required for default or static interface methods desugaring of `java.util.OptionalLong j$.$r8$wrapper$java$util$stream$LongStream$-WRP.findAny()`
Warning: Type `java.util.LongSummaryStatisticsConversions` was not found,it is required for default or static interface methods desugaring of `java.util.LongSummaryStatistics j$.$r8$wrapper$java$util$stream$LongStream$-WRP.summaryStatistics()`
Warning: Type `java.util.IntSummaryStatisticsConversions` was not found,it is required for default or static interface methods desugaring of `java.util.IntSummaryStatistics j$.$r8$wrapper$java$util$stream$IntStream$-WRP.summaryStatistics()`
Warning: Type `java.util.DoubleSummaryStatisticsConversions` was not found,it is required for default or static interface methods desugaring of `java.util.DoubleSummaryStatistics j$.$r8$wrapper$java$util$stream$DoubleStream$-WRP.summaryStatistics()`
当我运行应用程序时,在代码中使用以下“可选”启动活动时,应用程序崩溃,并显示为
I/ApplicationBase: Testing Java 8
E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
Process: com.example.app.DEV,PID: 8265
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:300)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:841)
Caused by: java.lang.NoClassDefFoundError: j$.util.Optional
at com.example.app.ApplicationBase.launch(ApplicationBase.java:251)
at com.example.app.LaunchTask.doInBackground(LaunchTask.java:19)
at com.example.app.LaunchTask.doInBackground(LaunchTask.java:6)
at android.os.AsyncTask$2.call(AsyncTask.java:288)
ApplicationBase.java
import androidx.multidex.MultiDexApplication
import java.util.Optional;
public class ApplicationBase extends MultiDexApplication implements LaunchTask.Launcher {
@SuppressLint("NewApi")
@Override
public void launch() throws IOException {
IOHandler ioHandler = new AndroidAppIOHandler(getApplicationContext());
Logger.i(TAG,"Testing Java 8");
Optional.of("xyz").ifPresent(__ -> Logger.i(TAG,"Good"));
Logger.i(TAG,"Tested Java 8");
...
}
...
}
我想念什么?
在阅读@sgjesse's answer似乎仅使用launch()
方法就发现了问题之后,我们进行了进一步的研究。我可以确认MultiDex.install()
之前已调用launch()
。
如果我在Optional
中添加AndroidAppIoHandler
,如下所示:
public AndroidAppIOHandler(Context context) {
this.context = context;
final Optional<Context> context1 = Optional.of(context);
Log.d("TESTMULTIDEX1",context1.getClass() + " " + context1.get().getClass() + " " + context1.toString());
}
然后我看到:
D/TESTMULTIDEX1( 2826): class j$.util.Optional class com.example.app.ApplicationBase Optional[com.example.app.ApplicationBase@9d006a00]
从launch()
的第一行开始调用。
如果我将Optional
添加到launch()
方法的下一行,就像这样:
public void launch() throws IOException {
IOHandler ioHandler = new AndroidAppIOHandler(getApplicationContext());
final Optional<IOHandler> ioHandler1 = Optional.of(ioHandler);
...
然后我看到:
java.lang.NoClassDefFoundError: j$.util.Optional
在执行完上面的另一条消息之后,执行相同的操作!
解决方法
我在我们的旧版应用上遇到了同样的问题,该应用仍支持 Android 4.1。在创建示例项目并尝试重现错误后,我发现了问题(或错误?)。
不幸的是,4.4 或更低版本的 Android 设备似乎无法使用任何 Java 8 类或接口,这些类或接口将在应用程序的 onCreate 方法中被核心库脱糖处理。
这似乎是一个奇怪的多索引问题/错误。
我尝试了以下方法:
class CoreApplication : MultiDexApplication() {
override fun attachBaseContext(base: Context?) {
//adding the new GMS causes to many Methods in APK,therefore configure Application as MultiDex
super.attachBaseContext(base)
MultiDex.install(this)
}
override fun onCreate() {
super.onCreate()
Optional.of("TEst")
}
}
这将导致您提到的崩溃:
03-22 18:36:09.231 657-657/com.plauzeware.CoreLibraryDesugeringCrashOnAndroidKitkat E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.plauzeware.CoreLibraryDesugeringCrashOnAndroidKitkat,PID: 657
java.lang.NoClassDefFoundError: j$.util.Optional
at com.plauzeware.corelibrarydesugeringcrashonandroidkitkat.CoreApplication.onCreate(Application.kt:17)
at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:1030)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4409)
at android.app.ActivityThread.access$1500(ActivityThread.java:139)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1270)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5086)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)
但是当我把对 Optional 的调用包装在一个辅助类中时
class Loader {
companion object {
fun load() {
Optional.of("TEst")
}
}
}
并在我的 onCreate 函数中调用它
class CoreApplication : MultiDexApplication() {
override fun attachBaseContext(base: Context?) {
//adding the new GMS causes to many Methods in APK,therefore configure Application as MultiDex
super.attachBaseContext(base)
MultiDex.install(this)
}
override fun onCreate() {
super.onCreate()
Loader.load()
}
}
它会起作用。我认为这是一个错误,我将提交错误报告,并使用指向它的链接更新此答案。
因为多索引问题也涉及到像 Iterable
这样的基本界面,所以解决这些错误真的很痛苦。尤其是因为我们仍然使用 OrmLite 并且它会一直使用 Iterable
。
我添加了代码以供参考我的 Github
更新:
Here 是错误报告的链接。
,如果仅在具有API级别19的设备上看到崩溃,原因可能是在使用已终止类型之前未调用MultiDex.install
。
java.util.Optional
(在已终止的库中称为j$.util.Optional
)的实现位于单独的DEX文件中。在不支持本机多dex(已在API级别21中添加)的设备上,必须先调用MultiDex.install
,然后才能使用已废止的类型。在MultiDexApplication
中,对MultiDex.install
的呼叫在attachBaseContext
中。如果在launch
之前调用MultiDex.install
方法,则会看到NoClassDefFoundError
。
我遇到了非常类似的问题,就我而言,事实证明它是Android Gradle插件中的a bug。长话短说,简短的AGP在不同的DEX文件中生成一些相同的包装类,这些类在Dalvik / ART移植到旧的Android版本上。而且问题仅在于调试版本,因为R8 / ProGuard对发行版本中的类进行了重复数据删除。
该问题有a workaround:
buildscript {
repositories {
maven {
url "https://storage.googleapis.com/r8-releases/raw/master" // NOTICE 'master' here!
}
}
dependencies {
classpath 'com.android.tools:r8:f03be11f11b8405b69876d05337e917a5519e52a' // Must be before the Gradle Plugin for Android.
classpath 'com.android.tools.build:gradle:X.Y.Z' // Your current AGP version.
}
}
希望这会对您有所帮助。
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