我创建了一个使用iText签署pdf文件的android应用程序。该项目在API级别上运行得非常好，但是，我在模拟器上遇到了一些问题。当我在模拟器上加载应用程序时，我遇到了这个问题：
02-21 20:51:52.368: E/dalvikvm(410): Could not find class 'com.lowagie.text.pdf.PdfReader', referenced from method com.exampl.exemp.Sign_pdf.signPdf
02-21 20:51:52.368: W/dalvikvm(410): VFY: unable to resolve new-instance 26 (Lcom/lowagie/text/pdf/PdfReader;) in Lcom/exampl/exemp/Sign_pdf;
02-21 20:51:52.378: D/dalvikvm(410): VFY: replacing opcode 0x22 at 0x004a
02-21 20:51:52.398: D/dalvikvm(410): VFY: dead code 0x004c-0095 in Lcom/exampl/exemp/Sign_pdf;.signPdf ()Z
02-21 20:51:57.187: I/dalvikvm(410): Total arena pages for JIT: 11
02-21 20:51:57.227: I/dalvikvm(410): Total arena pages for JIT: 12
02-21 20:51:57.487: D/AndroidRuntime(410): Shutting down VM
02-21 20:51:57.497: W/dalvikvm(410): threadid=1: thread exiting with uncaught exception (group=0x40015560)
02-21 20:51:57.517: E/AndroidRuntime(410): FATAL EXCEPTION: main
02-21 20:51:57.517: E/AndroidRuntime(410): java.lang.NoClassDefFoundError: com.lowagie.text.pdf.PdfReader
02-21 20:51:57.517: E/AndroidRuntime(410): at com.exampl.exemp.Sign_pdf.signPdf(Sign_pdf.java:47)
02-21 20:51:57.517: E/AndroidRuntime(410): at com.exampl.exemp.MainActivity.editText(MainActivity.java:114)
02-21 20:51:57.517: E/AndroidRuntime(410): at com.exampl.exemp.MainActivity.onCreate(MainActivity.java:36)
02-21 20:51:57.517: E/AndroidRuntime(410): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
02-21 20:51:57.517: E/AndroidRuntime(410): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
02-21 20:51:57.517: E/AndroidRuntime(410): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
02-21 20:51:57.517: E/AndroidRuntime(410): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
02-21 20:51:57.517: E/AndroidRuntime(410): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
02-21 20:51:57.517: E/AndroidRuntime(410): at android.os.Handler.dispatchMessage(Handler.java:99)
02-21 20:51:57.517: E/AndroidRuntime(410): at android.os.Looper.loop(Looper.java:123)
02-21 20:51:57.517: E/AndroidRuntime(410): at android.app.ActivityThread.main(ActivityThread.java:3683)
02-21 20:51:57.517: E/AndroidRuntime(410): at java.lang.reflect.Method.invokeNative(Native Method)
02-21 20:51:57.517: E/AndroidRuntime(410): at java.lang.reflect.Method.invoke(Method.java:507)
02-21 20:51:57.517: E/AndroidRuntime(410): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
02-21 20:51:57.517: E/AndroidRuntime(410): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
02-21 20:51:57.517: E/AndroidRuntime(410): at dalvik.system.NativeStart.main(Native Method)
02-21 20:56:57.660: I/Process(410): Sending signal. PID: 410 SIG: 9
问题可能是与iText jar有关，那么与android兼容的版本是什么。 任何帮助都非常感谢...