java.lang.ClassNotFoundException 绑定 Xamarin.ZE84E30B9390CDB486DZDB67 中的 java 库

Question

I'm trying to bind the libuvccamera java library to access UVC camera in Android device developing in Xamarin.Android, and during the binding of the libuvccamera.aar and the usbCameraCommon.aar file I've a lot of trouble. 其中一次是 java class 的 USBMonitor 构造函数时调用的 java.lang.ClassNotFoundException：

    USBMonitor usb_monitor; 

    try
    {
        usb_monitor = new USBMonitor(this, this);

    }
    catch (Exception ex)
    {
        Console.WriteLine(ex.Message);
        Console.WriteLine(ex.StackTrace);
    }

我已经按照此处所述导入了.arr 库

但是当我创建分发并将应用程序运行到我的 Android 设备时，我收到如下异常调用：

Failed resolution of: Lcom/serenegiant/utils/HandlerThreadHandler;
  at Java.Interop.JniEnvironment+InstanceMethods.CallNonvirtualVoidMethod (Java.Interop.JniObjectReference instance, Java.Interop.JniObjectReference type, Java.Interop.JniMethodInfo method, Java.Interop.JniArgumentValue* args) [0x0008e] in <94b04e1756104d1fa1d144932ae2720c>:0 
  at Android.Runtime.JNIEnv.CallNonvirtualVoidMethod (System.IntPtr jobject, System.IntPtr jclass, System.IntPtr jmethod, Android.Runtime.JValue* parms) [0x00000] in /Users/builder/azdo/_work/278/s/xamarin-android/src/Mono.Android/Android.Runtime/JNIEnv.g.cs:444 
  at Android.Runtime.JNIEnv.FinishCreateInstance (System.IntPtr instance, System.IntPtr jclass, System.IntPtr constructorId, Android.Runtime.JValue* constructorParameters) [0x00008] in /Users/builder/azdo/_work/278/s/xamarin-android/src/Mono.Android/Android.Runtime/JNIEnv.cs:362 
  at Com.Serenegiant.Usb.USBMonitor..ctor (Android.Content.Context context, Com.Serenegiant.Usb.USBMonitor+IOnDeviceConnectListener listener) [0x000df] in C:\dev\code\curr\LETTURA_DATA_MATRIX_LUXOTTICA\DEMO\TEST_UVC_CAMERA_LIB\TEST_3\LIBUVC\obj\Debug\generated\src\Com.Serenegiant.Usb.USBMonitor.cs:1076 
  at TEST_3.MainActivity.OnCreate (Android.OS.Bundle savedInstanceState) [0x0001e] in C:\dev\code\curr\LETTURA_DATA_MATRIX_LUXOTTICA\DEMO\TEST_UVC_CAMERA_LIB\TEST_3\TEST_3\MainActivity.cs:28 
  --- End of managed Java.Lang.NoClassDefFoundError stack trace ---
java.lang.NoClassDefFoundError: Failed resolution of: Lcom/serenegiant/utils/HandlerThreadHandler;
    at com.serenegiant.usb.USBMonitor.<init>(USBMonitor.java:122)
    at crc645ed0f3853a61fd03.MainActivity.n_onCreate(Native Method)
    at crc645ed0f3853a61fd03.MainActivity.onCreate(MainActivity.java:44)
    at android.app.Activity.performCreate(Activity.java:7957)
    at android.app.Activity.performCreate(Activity.java:7946)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1307)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3598)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3775)
    at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
    at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
    at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2261)
    at android.os.Handler.dispatchMessage(Handler.java:107)
    at android.os.Looper.loop(Looper.java:237)
    at android.app.ActivityThread.main(ActivityThread.java:8107)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:496)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1100)
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.serenegiant.utils.HandlerThreadHandler" on path: DexPathList[[zip file "/data/app/com.companyname.test_3-RASdU4LTR0mcU0jXj9KO8Q==/base.apk"],nativeLibraryDirectories=[/data/app/com.companyname.test_3-RASdU4LTR0mcU0jXj9KO8Q==/lib/arm, /data/app/com.companyname.test_3-RASdU4LTR0mcU0jXj9KO8Q==/base.apk!/lib/armeabi-v7a, /system/lib]]
    at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:196)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
    ... 18 more

一些建议如何解决这个问题？

谢谢！

Answer 1

我已经解决了这个问题。 我必须在 .arr 库中实现 HandlerThreadHandler class，所以 USBMonitor class 的构造函数可以找到它。