Question

我在Intent.cs 中遇到了错误

我在app.gradle中添加了android.annotation。 “

当我用 Intent next = new Intent（MainMenu.this，MainActivity.class）; 我收到运行时错误。错误消息是

"03-05 09:52:19.210 1339-1339/com.example.tesingphootc55 E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.tesingphootc55, PID: 1339
    java.lang.NoClassDefFoundError: Failed resolution of: Lcom/example/tesingphootc55/MainActivity;
        at com.example.tesingphootc55.MainMenu$CheckSequentialClosing.onPostExecute(MainMenu.java:2125)
        at com.example.tesingphootc55.MainMenu$CheckSequentialClosing.onPostExecute(MainMenu.java:2092)
        at android.os.AsyncTask.finish(AsyncTask.java:636)
        at android.os.AsyncTask.access$500(AsyncTask.java:177)
        at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:653)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:135)
        at android.app.ActivityThread.main(ActivityThread.java:5276)
        at java.lang.reflect.Method.invoke(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:372)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:911)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:706)
     Caused by: java.lang.ClassNotFoundException: Didn't find class "com.example.tesingphootc55.MainActivity" on path: DexPathList[[zip file "/data/app/com.example.tesingphootc55-1/base.apk"],nativeLibraryDirectories=[/data/app/com.example.tesingphootc55-1/lib/arm, /vendor/lib, /system/lib]]
        at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
        at com.example.tesingphootc55.MainMenu$CheckSequentialClosing.onPostExecute(MainMenu.java:2125) 
        at com.example.tesingphootc55.MainMenu$CheckSequentialClosing.onPostExecute(MainMenu.java:2092) 
        at android.os.AsyncTask.finish(AsyncTask.java:636) 
        at android.os.AsyncTask.access$500(AsyncTask.java:177) 
        at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:653) 
        at android.os.Handler.dispatchMessage(Handler.java:102) 
        at android.os.Looper.loop(Looper.java:135) 
        at android.app.ActivityThread.main(ActivityThread.java:5276) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at java.lang.reflect.Method.invoke(Method.java:372) 
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:911) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:706) 
        Suppressed: java.lang.NoClassDefFoundError: com.example.tesingphootc55.MainActivity
        at dalvik.system.DexFile.defineClassNative(Native Method)
        at dalvik.system.DexFile.defineClass(DexFile.java:226)
        at dalvik.system.DexFile.loadClassBinaryName(DexFile.java:219)
        at dalvik.system.DexPathList.findClass(DexPathList.java:321)
        at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:54)
                ... 14 more
        Suppressed: java.lang.ClassNotFoundException: com.example.tesingphootc55.MainActivity
        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)
                ... 13 more
     Caused by: java.lang.NoClassDefFoundError: Class is not found using the boot class loader; no stack available
"

Answer 1

我也尝试过的一种可能的解决方案是禁用即时运行goto 文件->设置->构建，执行，部署->即时运行->取消选中即时运行复选框。 >

在设备上运行项目之前，请先对其进行清洁。

修改

如果您的应用程序及其引用的库超过65k方法限制，请确保启用 multidex选项。为了在gradle build中支持multidex，请添加依赖项

dependencies {
  implementation 'com.android.support:multidex:1.0.3'
}

然后在defaultConfig中添加multiDexEnabled

defaultConfig {
        ...
        minSdkVersion 21 
        targetSdkVersion 28
        multiDexEnabled true
    }

有关multidex的更多信息，请访问android developer link

Answer 2

将相关性更改为下图。它可以解决该问题。

使用Intent调用类时找不到类

2 个答案: