in loader dalvik.system.PathClassLoader

本文解决了在Android应用开发过程中遇到的一个常见问题:活动(Activity)无法实例化导致的崩溃。问题源于第三方库的不当引入,文章详细介绍了如何正确配置第三方库及jar包,确保项目的正常运行。

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01-21 14:56:50.960: E/AndroidRuntime(14551): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.seagate.demo/com.seagate.demo.MainActivity}: java.lang.ClassNotFoundException: com.seagate.demo.MainActivity in loader dalvik.system.PathClassLoader[/data/app/com.seagate.demo-1.apk]


这个bug弄了2个小时才解决,原因是导入第三方公开库时,导入的不对造成的,请检查


  • 第三方公开库项目是否和引用项目在同一个目录下
  • Order and Export中是否勾选中你要导入的项目
  • project.properties文件中是否配置了公开库,配置方法:android.library.reference.1=../slidingmenu

另外在导入第三方jar包时,若导入不成功,可以删除libs中的jar包,再拷贝进去试一试

2 ---------------------------- 2025-05-28 21:33:28.383 22005-22005 ApplicationLoaders com.example.kucun2 D Returning zygote-cached class loader: /system_ext/framework/androidx.window.extensions.jar 2025-05-28 21:33:28.383 22005-22005 ApplicationLoaders com.example.kucun2 D Returning zygote-cached class loader: /system_ext/framework/androidx.window.sidecar.jar 2025-05-28 21:33:28.385 22005-22005 .example.kucun2 com.example.kucun2 E Attempt to load writable dex file: /data/data/com.example.kucun2/code_cache/.overlay/base.apk/classes7.dex --------- beginning of crash 2025-05-28 21:33:28.385 22005-22005 AndroidRuntime com.example.kucun2 D Shutting down VM 2025-05-28 21:33:28.387 22005-22005 AndroidRuntime com.example.kucun2 E FATAL EXCEPTION: main Process: com.example.kucun2, PID: 22005 java.lang.SecurityException: Writable dex file '/data/data/com.example.kucun2/code_cache/.overlay/base.apk/classes7.dex' is not allowed. at dalvik.system.DexFile.openDexFileNative(Native Method) at dalvik.system.DexFile.openDexFile(DexFile.java:428) at dalvik.system.DexFile.<init>(DexFile.java:133) at dalvik.system.DexFile.<init>(DexFile.java:106) at dalvik.system.DexPathList.loadDexFile(DexPathList.java:438) at dalvik.system.DexPathList.makeDexElements(DexPathList.java:387) at dalvik.system.DexPathList.<init>(DexPathList.java:166) at dalvik.system.BaseDexClassLoader.<init>(BaseDexClassLoader.java:160) at dalvik.system.BaseDexClassLoader.<init>(BaseDexClassLoader.java:130) at dalvik.system.PathClassLoader.<init>(PathClassLoader.java:146) at com.android.internal.os.ClassLoaderFactory.createClassLoader(ClassLoaderFactory.java:93) at com.android.internal.os.ClassLoaderFactory.createClassLoader(ClassLoaderFactory.java:134) at android.app.ApplicationLoaders.getClassLoader(ApplicationLoaders.java:126) at android.app.ApplicationLoaders.getClassLoaderWithSharedLibraries(ApplicationLoaders.java:61) at android.app.LoadedApk.createOrUpdateClassLoaderLocked(LoadedApk.java:1069) at android.app.LoadedApk.getClassLoader(LoadedApk.java:1165) at android.app.LoadedApk.getResources(LoadedApk.java:1413) at android.app.ContextImpl.createAppContext(ContextImpl.java:3497) at android.app.ContextImpl.createAppContext(ContextImpl.java:3482) at android.app.ActivityThread.handleBindApplication(ActivityThread.java:8386) at android.app.ActivityThread.-$$Nest$mhandleBindApplication(Unknown Source:0) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2871) at android.os.Handler.dispatchMessage(Handler.java:109) at android.os.Looper.loopOnce(Looper.java:250) at android.os.Looper.loop(Looper.java:340) at android.app.ActivityThread.main(ActivityThread.java:9902) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:621) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:957) ---------------------------- PROCESS ENDED (22005) for package com.example.kucun2 ---------------------------- 2025-05-28 21:33:28.393 22005-22005 Process com.example.kucun2 I Sending signal. PID: 22005 SIG: 9 ---------------------------- PROCESS STARTED (22077) for package com.example.kucun2 ---------------------------- 2025-05-28 21:33:37.051 22077-22077 ApplicationLoaders com.example.kucun2 D Returning zygote-cached class loader: /system_ext/framework/androidx.window.extensions.jar
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05-29
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