Question

当前，我无法解决java.lang.NoClassDefFoundError: Failed resolution of: Ljava/time/Instant;崩溃问题，这种崩溃发生在Android 7.1.1（Nougat）及其下方。但我的Oreo模拟器运行Instant.parse(...)就好了。

堆栈跟踪：

java.lang.NoClassDefFoundError: Failed resolution of: Ljava/time/Instant;
                  at (application class)
                  at retrofit2.ExecutorCallAdapterFactory$ExecutorCallbackCall$1$1.run(ExecutorCallAdapterFactory.java:70)
                  at android.os.Handler.handleCallback(Handler.java:751)
                  at android.os.Handler.dispatchMessage(Handler.java:95)
                  at android.os.Looper.loop(Looper.java:154)
                  at android.app.ActivityThread.main(ActivityThread.java:6119)
                  at java.lang.reflect.Method.invoke(Native Method)
                  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
                  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
               Caused by: java.lang.ClassNotFoundException: Didn't find class "java.time.Instant" on path: DexPathList[[zip file "/data/app/(app-domain)/base.apk", zip file "/data/app/(app-domain)/split_lib_dependencies_apk.apk", zip file "/data/app/(app-domain)/split_lib_slice_0_apk.apk", zip file "/data/app/(app-domain)/split_lib_slice_1_apk.apk", zip file "/data/app/(app-domain)/split_lib_slice_2_apk.apk", zip file "/data/app/(app-domain)/split_lib_slice_3_apk.apk", zip file "/data/app/(app-domain)/split_lib_slice_4_apk.apk", zip file "/data/app/(app-domain)/split_lib_slice_5_apk.apk", zip file "/data/app/(app-domain)/split_lib_slice_6_apk.apk", zip file "/data/app/(app-domain)/split_lib_slice_7_apk.apk", zip file "/data/app/(app-domain)/split_lib_slice_8_apk.apk", zip file "/data/app/(app-domain)/split_lib_slice_9_apk.apk"],nativeLibraryDirectories=[/data/app/(app-domain)/lib/arm64, /data/app/(app-domain)/base.apk!/lib/arm64-v8a, /data/app/(app-domain)/split_lib_dependencies_apk.apk!/lib/arm64-v8a, /data/app/(app-domain)/split_lib_slice_0_apk.apk!/lib/arm64-v8a, /data/app/(app-domain)/split_lib_slice_1_apk.apk!/lib/arm64-v8a, /data/app/(app-domain)/split_lib_slice_2_apk.apk!/lib/arm64-v8a, /data/app/(app-domain)/split_lib_slice_3_apk.apk!/lib/arm64-v8a, /data/app/(app-domain)/split_lib_slice_4_apk.apk!/lib/arm64-v8a, /data/app/(app-domain)/split_lib_slice_5_apk.apk!/lib/arm64-v8a, /data/app/(app-domain)/split_lib_slice_6_apk.apk!/lib/arm64-v8a, /data/app/(app-domain)/split_lib_slice_7_apk.apk!/lib/arm64-v8a, /data/app/(app-domain)/split_lib_slice_8_apk.apk!/lib/arm64-v8a, /data/app/(app-domain)/split_lib_slice_9_apk.apk!/lib/arm64-v8a, /system/lib64, /vendor/lib64]]
                  at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
                  at java.lang.ClassLoader.loadClass(ClassLoader.java:380)
                  at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
                  at (application class)
                  at retrofit2.ExecutorCallAdapterFactory$ExecutorCallbackCall$1$1.run(ExecutorCallAdapterFactory.java:70) 
                  at android.os.Handler.handleCallback(Handler.java:751) 
                  at android.os.Handler.dispatchMessage(Handler.java:95) 
                  at android.os.Looper.loop(Looper.java:154) 
                  at android.app.ActivityThread.main(ActivityThread.java:6119) 
                  at java.lang.reflect.Method.invoke(Native Method) 
                  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886) 
                  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)

违规代码：

Date parseDate = Date.from(Instant.parse(model.getDate() + "Z"));

其中model是日期String，格式为"yyyy-mm-ddTkk:mm:ss"

我的JDK版本现在为1.8。我知道我应该在我的build.gradle：

中指明后端功能

android {
compileSdkVersion 26
defaultConfig {
    ...
    minSdkVersion 19
    targetSdkVersion 26
    versionCode 1
    versionName "0.2-2018-04-16"
    testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
...

compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
    }
}

dependencies {
     implementation "com.jakewharton.threetenabp:threetenabp:1.0.5"
}

根据我在此处阅读的内容，显然Instant.parse(...)并未包含在支持的API中：https://developer.android.com/studio/write/java8-support.html#supported_features

我能错过什么？我不妨使用＆＃34; ailing Date and Calendar APIs in both Java and Android＆＃34; ，但这将是最后的选择。我想尽可能坚持JDK 1.8所提供的。

此外，我不习惯使用Joda Time，因为它对于我正在开发的这么小的应用来说太大了，而且在这种情况下我只需要几个功能。

任何意见都会受到赞赏！

Nota bene ：合同明确要求我使用Java而不是Kotlin。

Answer 1

如果您打开sdk文档https://developer.android.com/reference/java/time/Instant.html，则会在右上角看到＆＃34;在API级别26＆＃34; 中添加，这意味着该类在旧版Android上不可用设备

您的清单包含 minSdkVersion 19 。这意味着我保证我的应用程序将在api-19和更新版本上运行。例外情况告诉你承诺被破坏了。

如何解决：

要么：不要使用Instant来保持与android-api-19的兼容性。您可以尝试使用SimpleDateFormat将日期从字符串格式解析为日期格式。
或者：告诉你的清单应用程序需要api-26和更新的 minSdkVersion 26 。这意味着您无法再在Android-api-19设备上安装您的应用程序

java.lang.NoClassDefFoundError：解析失败：Ljava / time / Instant;

1 个答案: