当我尝试在Xamrin Android应用中执行以下代码行时遇到错误：
EntityEditor ee = new EntityEditor();
EntityEditor类是一个DialogFragment，其代码如下所示：
namespace Storyvoque
{
public class EntityEditor : DialogFragment
{
EditText entityId;
EditText entityType;
EditText entityName;
EditText entityDescription;
EditText containerEntityId;
AutoCompleteTextView containerEntityName;
EditText targetEntityId;
AutoCompleteTextView targetEntityName;
EditText destinationEntityId;
AutoCompleteTextView destinationEntityName;
EditText entityOwner;
EditText entityDate;
CheckBox syncPending;
public StoryEntity editData;
public override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
// Create your fragment here
}
public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
return inflater.Inflate(Resource.Layout.EntityEditor, container, false);
}
public override void OnViewCreated(View view, Bundle savedInstanceState)
{
entityId = (EditText)View.FindViewById(Resource.Id.entityId);
entityType = (EditText)View.FindViewById(Resource.Id.entityType);
entityName = (EditText)View.FindViewById(Resource.Id.entityName);
entityDescription = (EditText)View.FindViewById(Resource.Id.entityDescription);
containerEntityId = (EditText)View.FindViewById(Resource.Id.containerEntityId);
containerEntityName = (AutoCompleteTextView)View.FindViewById(Resource.Id.containerEntityName);
targetEntityId = (EditText)View.FindViewById(Resource.Id.targetEntityId);
targetEntityName = (AutoCompleteTextView)View.FindViewById(Resource.Id.targetEntityName);
destinationEntityId = (EditText)View.FindViewById(Resource.Id.destinationEntityId);
destinationEntityName = (AutoCompleteTextView)View.FindViewById(Resource.Id.destinationEntityName);
entityOwner = (EditText)View.FindViewById(Resource.Id.entityOwner);
entityDate = (EditText)View.FindViewById(Resource.Id.entityDate);
syncPending = (CheckBox)View.FindViewById(Resource.Id.syncPending);
base.OnViewCreated(view, savedInstanceState);
}
public void LoadData(StoryData source, UserData users, StoryEntity data)
{
entityId.Text = data.EntityId.ToString();
entityType.Text = data.EntityType.ToString();
entityName.Text = data.Name;
entityDescription.Text = data.Text;
containerEntityId.Text = data.Container.ToString();
containerEntityName.Text = source.GetWrapper(data.Container)?.Name ?? string.Empty;
targetEntityId.Text = data.Target.ToString();
targetEntityName.Text = source.GetWrapper(data.Target)?.Name ?? string.Empty;
destinationEntityId.Text = data.Destination.ToString();
destinationEntityName.Text = source.GetWrapper(data.Destination)?.Name ?? string.Empty;
entityOwner.Text = users[data.UserNum]?.DisplayName ?? data.UserNum.ToString();
entityDate.Text = data.Date.ToLocalTime().ToString("G");
syncPending.Checked = data.SyncRequired;
}
public void StoreData(StoryEntity data)
{
data.EntityId = Int32.Parse(entityId.Text);
data.Name = entityName.Text;
data.Text = entityDescription.Text;
data.Container = Int32.Parse(containerEntityId.Text);
data.Target = Int32.Parse(targetEntityId.Text);
data.Destination = Int32.Parse(destinationEntityId.Text);
}
public override void OnDismiss(IDialogInterface dialog)
{
StoreData(editData);
base.OnDismiss(dialog);
}
}
}
我认为我们不需要查看AXML文件，因为它在发生错误之前从未到达OnCreatedView函数。错误的调用堆栈如下所示：
Java.Lang.ClassNotFoundException: Didn't find class "md59096a9123c571e4f030e303e8372967e.EntityEditor" on path: DexPathList[[zip file "/data/app/com.enigmadream.storyvoque-1/base.apk"],nativeLibraryDirectories=[/data/app/com.enigmadream.storyvoque-1/lib/x86, /data/app/com.enigmadream.storyvoque-1/base.apk!/lib/x86, /vendor/lib, /system/lib]]
at Java.Interop.JniEnvironment+Types.FindClass (System.String classname) [0x00114] in <54816278eed9488eb28d3597fecd78f8>:0
at Java.Interop.JniType..ctor (System.String classname) [0x00006] in <54816278eed9488eb28d3597fecd78f8>:0
at Java.Interop.JniPeerMembers+JniInstanceMethods..ctor (System.Type declaringType) [0x00064] in <54816278eed9488eb28d3597fecd78f8>:0
at Java.Interop.JniPeerMembers+JniInstanceMethods.GetConstructorsForType (System.Type declaringType) [0x0002c] in <54816278eed9488eb28d3597fecd78f8>:0
at Java.Interop.JniPeerMembers+JniInstanceMethods.StartCreateInstance (System.String constructorSignature, System.Type declaringType, Java.Interop.JniArgumentValue* parameters) [0x00032] in <54816278eed9488eb28d3597fecd78f8>:0
at Android.App.DialogFragment..ctor () [0x00034] in <28e323a707a2414f8b493f6d4bb27c8d>:0
at Storyvoque.EntityEditor..ctor () <0x97e236a0 + 0x0002b> in <c813259d00bd4c8dafdb14124c1c8a19>:0
at Storyvoque.CommandProcessor.ProcessCommand (Storyvoque.Parser.Command command, Storyvoque.UserData users, Storyvoque.StoryData storyData, System.Boolean activePlayer) [0x00091] in C:\Users\bluem\Documents\Visual Studio 2017\Projects\Storyvoque\Storyvoque\CommandProcessor.cs:29
at Storyvoque.MainActivity.SendCommand (Android.Views.View view) [0x000fb] in C:\Users\bluem\Documents\Visual Studio 2017\Projects\Storyvoque\Storyvoque\MainActivity.cs:146
--- End of managed Java.Lang.ClassNotFoundException stack trace ---
java.lang.ClassNotFoundException: Didn't find class "md59096a9123c571e4f030e303e8372967e.EntityEditor" on path: DexPathList[[zip file "/data/app/com.enigmadream.storyvoque-1/base.apk"],nativeLibraryDirectories=[/data/app/com.enigmadream.storyvoque-1/lib/x86, /data/app/com.enigmadream.storyvoque-1/base.apk!/lib/x86, /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 md59096a9123c571e4f030e303e8372967e.MainActivity.n_SendCommand(Native Method)
at md59096a9123c571e4f030e303e8372967e.MainActivity.SendCommand(MainActivity.java:42)
at java.lang.reflect.Method.invoke(Native Method)
at android.view.View$DeclaredOnClickListener.onClick(View.java:4447)
at android.view.View.performClick(View.java:5198)
at android.view.View$PerformClick.run(View.java:21147)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Suppressed: java.lang.ClassNotFoundException: md59096a9123c571e4f030e303e8372967e.EntityEditor
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)
... 14 more
Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack trace available
如何缩小或解决此问题？
答案 0 :(得分：4)
感谢对该问题的评论，我found这是一个可以通过每次清理和重建来解决的错误。
答案 1 :(得分：0)
我在Xamarin Android绑定项目中遇到了同样的问题，解决方法是将本机.jar / .aar库的“构建操作”设置为EmbeddedJar。默认值为InputJar，这意味着生成的apk将不具有本机库，除非您直接提供它。 https://docs.microsoft.com/en-us/xamarin/android/platform/binding-java-library/#build-actions