CameraManager.TorchCallback抛出ClassNotFound异常

Question

我试图创建具有多个功能的小部件，其中一个是手电筒。

我使用新的Camera2 api但无法真正使用它。

我创建了自定义CameraManager.TorchCallback类来处理火炬开/关回调，但constructor调用抛出ClassNotFound异常：

  

没找到课程＆＃34; md50ef6a3f50a79fbeb48e8252e4750d416.FlashLightCallback＆＃34; on path：DexPathList [[zip file＆＃34; /data/app/com.arsena.rooting-1/base.apk"]，nativeLibraryDirectories = [/ data / app / com.arsena.rooting-1 / lib / arm，/ vendor / lib，/ system / lib]]

以下是我appWidget的部分来源：

public class RootWidgets : AppWidgetProvider, IFlashLightStateListener
{
    Context _context;

    public override void OnReceive(Context context, Intent intent)
    {
        if (/* some condition */)
        {
            _context = context;
            UpdateWidget(context);
            return;
        }
    }

    #region IFlashLightStateListener implementation

    bool _flashLightEnabled;
    public bool IsFlashLightEnabled
    {
        get
        {
            return _flashLightEnabled;
        }

        set
        {
            _flashLightEnabled = value;
            UpdateWidget(_context);
        }
    }

    #endregion

    private void UpdateWidget(Context context)
    {
        // some actions...

        CameraManager cameraManager = (CameraManager)context.GetSystemService(Context.CameraService);
        var callBack = new FlashLightCallback(this);

        cameraManager.RegisterTorchCallback(callBack, null);

        // some actions...
    }
}

FlashLightCallback上课：

 public class FlashLightCallback : CameraManager.TorchCallback
{
    IFlashLightStateListener _fListener;
    Context _context;

    public FlashLightCallback(IFlashLightStateListener flashStateListener) // here comes exception
    {
        _fListener = flashStateListener;
    }

    public override void OnTorchModeChanged(string cameraId, bool enabled)
    {
        base.OnTorchModeChanged(cameraId, enabled);

        _fListener.IsFlashLightEnabled = enabled;
    }
}

public interface IFlashLightStateListener
{
    bool IsFlashLightEnabled { get; set; }
}

完整的异常堆栈跟踪：

    [flashlight] Java.Lang.ClassNotFoundException: Didn't find class "md50ef6a3f50a79fbeb48e8252e4750d416.FlashLightCallback" on path: DexPathList[[zip file "/data/app/com.arsena.rooting-1/base.apk"],nativeLibraryDirectories=[/data/app/com.arsena.rooting-1/lib/arm, /vendor/lib, /system/lib]]

[flashlight]   at Java.Interop.JniEnvironment+Types.FindClass (System.String classname) [0x00132] in /Users/builder/data/lanes/3340/4e275588/source/Java.Interop/src/Java.Interop/Java.Interop/JniEnvironment.Types.cs:66 
[flashlight]   at Java.Interop.JniType..ctor (System.String classname) [0x00008] in /Users/builder/data/lanes/3340/4e275588/source/Java.Interop/src/Java.Interop/Java.Interop/JniType.cs:30 
[flashlight]   at Java.Interop.JniPeerMembers+JniInstanceMethods..ctor (System.Type declaringType) [0x0006a] in /Users/builder/data/lanes/3340/4e275588/source/Java.Interop/src/Java.Interop/Java.Interop/JniPeerMembers.JniInstanceMethods.cs:25 
[flashlight]   at Java.Interop.JniPeerMembers+JniInstanceMethods.GetConstructorsForType (System.Type declaringType) [0x0003b] in /Users/builder/data/lanes/3340/4e275588/source/Java.Interop/src/Java.Interop/Java.Interop/JniPeerMembers.JniInstanceMethods.cs:80 
[flashlight]   at Java.Interop.JniPeerMembers+JniInstanceMethods.StartCreateInstance (System.String constructorSignature, System.Type declaringType, Java.Interop.JniArgumentValue* parameters) [0x00044] in /Users/builder/data/lanes/3340/4e275588/source/Java.Interop/src/Java.Interop/Java.Interop/JniPeerMembers.JniInstanceMethods.cs:111 
[flashlight]   at Android.Hardware.Camera2.CameraManager+TorchCallback..ctor () [0x00022] in /Users/builder/data/lanes/3340/4e275588/source/monodroid/src/Mono.Android/platforms/android-23/src/generated/Android.Hardware.Camera2.CameraManager.cs:175 
[flashlight]   at Rooting.FlashLightCallback..ctor (IFlashLightStateListener flashStateListener) [0x00000] in /Users/imac/Projects/Rooting/Rooting/FlashLightCallback.cs:12 
[flashlight]   at Rooting.RootWidget.UpdateWidget (Android.Content.Context context) [0x001fe] in /Users/imac/Projects/Rooting/Rooting/RootWidget.cs:173 

[flashlight]   --- End of managed exception stack trace ---
[flashlight] java.lang.ClassNotFoundException: Didn't find class "md50ef6a3f50a79fbeb48e8252e4750d416.FlashLightCallback" on path: DexPathList[[zip file "/data/app/com.arsena.rooting-1/base.apk"],nativeLibraryDirectories=[/data/app/com.arsena.rooting-1/lib/arm, /vendor/lib, /system/lib]]
[flashlight]    at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
[flashlight]    at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
[flashlight]    at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
[flashlight]    at md50ef6a3f50a79fbeb48e8252e4750d416.RootWidget.n_onReceive(Native Method)
[flashlight]    at md50ef6a3f50a79fbeb48e8252e4750d416.RootWidget.onReceive(RootWidget.java:29)
[flashlight]    at android.app.ActivityThread.handleReceiver(ActivityThread.java:3022)
[flashlight]    at android.app.ActivityThread.access$1800(ActivityThread.java:179)
[flashlight]    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1539)
[flashlight]    at android.os.Handler.dispatchMessage(Handler.java:102)
[flashlight]    at android.os.Looper.loop(Looper.java:145)
[flashlight]    at android.app.ActivityThread.main(ActivityThread.java:5972)
[flashlight]    at java.lang.reflect.Method.invoke(Native Method)
[flashlight]    at java.lang.reflect.Method.invoke(Method.java:372)
[flashlight]    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1399)
[flashlight]    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)
[flashlight]    Suppressed: java.lang.NoClassDefFoundError: md50ef6a3f50a79fbeb48e8252e4750d416.FlashLightCallback
[flashlight]        at dalvik.system.DexFile.defineClassNative(Native Method)
[flashlight]        at dalvik.system.DexFile.defineClass(DexFile.java:226)
[flashlight]        at dalvik.system.DexFile.loadClassBinaryName(DexFile.java:219)
[flashlight]        at dalvik.system.DexPathList.findClass(DexPathList.java:321)
[flashlight]        at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:54)
[flashlight]        ... 14 more
[flashlight]    Suppressed: java.lang.ClassNotFoundException: md50ef6a3f50a79fbeb48e8252e4750d416.FlashLightCallback
[flashlight]        at java.lang.Class.classForName(Native Method)
[flashlight]        at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
[flashlight]        at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
[flashlight]        at java.lang.ClassLoader.loadClass(ClassLoader.jav

任何想法我做错了什么？

修改：

使用sample复制例外。