当通过adb安装安装apk时，应用程序类发生ClassNotFoundException，但在通过android studio运行时工作正常

我正在使用Android studio 3.0 beta 9构建apk。但最近我遇到，当我在emulator或真实设备上通过adb install运行apk时，它会弹出ClassNotFoundException，在dexPathList中找不到应用程序类

但当我通过Android Studio运行时，它运行得很好。知道原因是什么吗

以下是错误日志：-

E/AndroidRuntime: FATAL EXCEPTION: main
                  Process: com.example.demo, PID: 27637
                  java.lang.RuntimeException: Unable to instantiate application
com.example.demo.MyApplication:java.lang.ClassNotFoundException: Didn't find class "com.example.demo.MyApplication" on path: DexPathList[[zip file "/data/app/com.example.demo-1/base.apk"],nativeLibraryDirectories=[/data/app/com.example.demo-1/lib/arm, /data/app/com.example.demo-1/base.apk!/lib/armeabi-v7a, /vendor/lib, /system/lib]]
at android.app.LoadedApk.makeApplication(LoadedApk.java:680)
                                                                         at android.app.ActivityThread.handleBindApplication(ActivityThread.java:6429)
                                                                         at android.app.ActivityThread.access$1800(ActivityThread.java:229)
                                                                         at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1898)
                                                                         at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                         at android.os.Looper.loop(Looper.java:148)
                                                                         at android.app.ActivityThread.main(ActivityThread.java:7402)
                                                                         at java.lang.reflect.Method.invoke(Native Method)
                                                                         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
                                                                         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
                                                                      Caused by: java.lang.ClassNotFoundException: Didn't find class "com.example.demo.MyApplication" on path: DexPathList[[zip file "/data/app/com.example.demo-1/base.apk"],nativeLibraryDirectories=[/data/app/com.example.demo-1/lib/arm, /data/app/com.example.demo-1/base.apk!/lib/armeabi-v7a, /vendor/lib, /system/lib]]
                                                                         at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
                                                                         at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
                                                                         at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
                                                                         at android.app.Instrumentation.newApplication(Instrumentation.java:1005)
                                                                         at android.app.LoadedApk.makeApplication(LoadedApk.java:670)
                                                                         at android.app.ActivityThread.handleBindApplication(ActivityThread.java:6429) 
                                                                         at android.app.ActivityThread.access$1800(ActivityThread.java:229) 
                                                                         at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1898) 
                                                                         at android.os.Handler.dispatchMessage(Handler.java:102) 
                                                                         at android.os.Looper.loop(Looper.java:148) 
                                                                         at android.app.ActivityThread.main(ActivityThread.java:7402) 
                                                                         at java.lang.reflect.Method.invoke(Native Method) 
                                                                         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) 
                                                                         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120) 
                                                                        Suppressed: java.lang.ClassNotFoundException: com.example.demo.MyApplication
                                                                         at java.lang.Class.classForName(Native Method)
                                                                         at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
                                                                         at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
                                                                         at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
                                                                                ... 12 more
                                                                      Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack trace available

---

这是因为您的proguard最小化。因此，要么编辑您的proguard属性并排除您的类要么禁用proguard for

release

apk

在您的

build.gradle

中，将

minifyEnabled

属性设置为

false

，以禁用

release

apk

中的proguard

buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
        debug {
            minifyEnabled false 
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }

    }

---

我终于得到了答案，有两个问题，第一个是提到的 ，当我在Android设备上直接运行应用程序时，我试图在Android Studio构建的apk上安装adb

第二个问题被提到

因此，当我试图通过build gradle任务构建apk时，它显示了错误：-

Error:Failed to complete Gradle execution.

Cause:
The version of Gradle you are using (3.3) does not support the forTasks() method on BuildActionExecuter. Support for this is available in Gradle 3.5 and all later versions.

---

因此，我将Gradle版本升级到最新版本一次并解决了问题。

尝试取消选中即时运行。。谢谢，但我已经启用了minifyEnabled错误配置。但这仍然是一个问题。