问题
Please this will be not DUPLICATE question
Don't know but I have already put .jar in libs folder and also done following process
And also
I have checked this I'm getting a java.lang.classnotfoundexception: com.mysql.jdbc.Driver
I have done several projects but in first time I am getting with this dropbox sample Project
Lotcat is
10-14 13:01:00.580: W/dalvikvm(2902): threadid=1: thread exiting with uncaught exception (group=0x430d5140)
10-14 13:01:00.580: E/AndroidRuntime(2902): FATAL EXCEPTION: main
10-14 13:01:00.580: E/AndroidRuntime(2902): Process: com.dropbox.sample.hellodropbox, PID: 2902
10-14 13:01:00.580: E/AndroidRuntime(2902): java.lang.NoClassDefFoundError: com.dropbox.sync.android.DbxAccountManager
10-14 13:01:00.580: E/AndroidRuntime(2902): at com.dropbox.sample.hellodropbox.HelloDropboxActivity.onCreate(HelloDropboxActivity.java:44)
10-14 13:01:00.580: E/AndroidRuntime(2902): at android.app.Activity.performCreate(Activity.java:5403)
10-14 13:01:00.580: E/AndroidRuntime(2902): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
10-14 13:01:00.580: E/AndroidRuntime(2902): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2270)
10-14 13:01:00.580: E/AndroidRuntime(2902): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2396)
10-14 13:01:00.580: E/AndroidRuntime(2902): at android.app.ActivityThread.access$800(ActivityThread.java:139)
10-14 13:01:00.580: E/AndroidRuntime(2902): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1293)
10-14 13:01:00.580: E/AndroidRuntime(2902): at android.os.Handler.dispatchMessage(Handler.java:102)
10-14 13:01:00.580: E/AndroidRuntime(2902): at android.os.Looper.loop(Looper.java:149)
10-14 13:01:00.580: E/AndroidRuntime(2902): at android.app.ActivityThread.main(ActivityThread.java:5257)
10-14 13:01:00.580: E/AndroidRuntime(2902): at java.lang.reflect.Method.invokeNative(Native Method)
10-14 13:01:00.580: E/AndroidRuntime(2902): at java.lang.reflect.Method.invoke(Method.java:515)
10-14 13:01:00.580: E/AndroidRuntime(2902): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:817)
10-14 13:01:00.580: E/AndroidRuntime(2902): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:633)
10-14 13:01:00.580: E/AndroidRuntime(2902): at dalvik.system.NativeStart.main(Native Method)
Even there is a class in Refrenced Libraries
Please just try with this
https://www.dropbox.com/developers/downloads/sdks/datastore/android/dropbox-android-sync-sdk-3.1.1.zip SDK if you are also getting this kind of error or not ?
回答1:
I had the same problem. The dropbox-sync-sdk-android.jar was existed on the class-path, but the classes were not included to resulting apk during build process. Later I noticed multiple errors in Android build console:
[dx] bad class file magic (cafebabe) or version (0033.0000)
Looks like Dropbox API is compiled against JDK 1.7 and you will have troubles when trying to build APK with this jar using JDK 1.6
I fixed this issue by updating Compiler compliance level:
Project->Properties->Java Compiler->Compiler compliance level->1.7
Also make sure that your Android SDK Build-tools are v19 or later:
Android SDK Manager->Android SDK Build-tools->check v21.0.2->uncheck v17(my case)
来源：https://stackoverflow.com/questions/26355284/java-lang-noclassdeffounderror-com-dropbox-sync-android-dbxaccountmanager