java - 错误 "Unable to instantiate activity ... Didn' t 在路径 : DexPathList"上找到类

Question

当我尝试在 Eclipse 上构建应用程序时，出现以下错误:

05-20 15:04:51.202: E/AndroidRuntime(1543): FATAL EXCEPTION: main
05-20 15:04:51.202: E/AndroidRuntime(1543): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.devyanlab.testapp/com.devyanlab.testapp.activities.IntroActivity}: java.lang.ClassNotFoundException: Didn't find class "com.devyanlab.testapp.activities.IntroActivity" on path: DexPathList[[zip file "/data/app/com.devyanlab.testapp-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.devyanlab.testapp-1, /system/lib]]
05-20 15:04:51.202: E/AndroidRuntime(1543):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2137)
05-20 15:04:51.202: E/AndroidRuntime(1543):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
05-20 15:04:51.202: E/AndroidRuntime(1543):     at android.app.ActivityThread.access$600(ActivityThread.java:141)
05-20 15:04:51.202: E/AndroidRuntime(1543):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
05-20 15:04:51.202: E/AndroidRuntime(1543):     at android.os.Handler.dispatchMessage(Handler.java:99)
05-20 15:04:51.202: E/AndroidRuntime(1543):     at android.os.Looper.loop(Looper.java:137)
05-20 15:04:51.202: E/AndroidRuntime(1543):     at android.app.ActivityThread.main(ActivityThread.java:5103)
05-20 15:04:51.202: E/AndroidRuntime(1543):     at java.lang.reflect.Method.invokeNative(Native Method)
05-20 15:04:51.202: E/AndroidRuntime(1543):     at java.lang.reflect.Method.invoke(Method.java:525)
05-20 15:04:51.202: E/AndroidRuntime(1543):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
05-20 15:04:51.202: E/AndroidRuntime(1543):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
05-20 15:04:51.202: E/AndroidRuntime(1543):     at dalvik.system.NativeStart.main(Native Method)
05-20 15:04:51.202: E/AndroidRuntime(1543): Caused by: java.lang.ClassNotFoundException: Didn't find class "com.devyanlab.testapp.activities.IntroActivity" on path: DexPathList[[zip file "/data/app/com.devyanlab.testapp-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.devyanlab.testapp-1, /system/lib]]
05-20 15:04:51.202: E/AndroidRuntime(1543):     at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:53)
05-20 15:04:51.202: E/AndroidRuntime(1543):     at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
05-20 15:04:51.202: E/AndroidRuntime(1543):     at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
05-20 15:04:51.202: E/AndroidRuntime(1543):     at android.app.Instrumentation.newActivity(Instrumentation.java:1061)
05-20 15:04:51.202: E/AndroidRuntime(1543):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2128)
05-20 15:04:51.202: E/AndroidRuntime(1543):     ... 11 more

应用程序中没有错误。我试过(除其他外):

• 清理应用
• 在首选项 > Java 构建路径中选中“Android 私有(private)库”
• 检查 AndroidManifest.xml 上的 Activity 路径
• 多次重启 Eclipse
• 重启模拟器(Genymotion)

有什么想法吗？

Answer 1

右键单击您的项目并选择属性。 “属性”面板将打开。从左侧的菜单转到 Java Build Path -> Order and Export 。从下面的列表中检查您添加到项目中的库或外部 jar。最后清理您的项目并运行。