facebook android sdk 3.0 login another activity crash -


i use android sdk 3.0 login code session in mainactivity can run ..

but move new activtiy fb.java.can't run .click button crash..

plase how fix:

mainactivity.java code

public void fbautotest(view v){  fb myffb=new fb(); myffb.facebooklogin();}

fb.java code

public class fb extends activity{  private static final list<string> permissions = arrays.aslist("publish_actions","user_photos"); private pendingaction pendingaction = pendingaction.none; private enum pendingaction {     none, post_photo, post_status_update }  private statuscallback callback; //private activity mcontext; private activity mcontext;   public void facebooklogin() {       session.openactivesession(mcontext, true, new session.statuscallback() {          // callback when session changes state          @override         public void call(session session, sessionstate state, exception exception) {              if (session.isopened()) {                 request.executemerequestasync(session, new request.graphusercallback() {                        // callback after graph api response user object                       @override                     public void oncompleted(graphuser user,                             response response) {                        }                     });              }         }       });  }   }

error code

04-05 06:50:16.246: w/dalvikvm(904): threadid=1: thread exiting uncaught exception (group=0x40a13300) 04-05 06:50:16.326: e/androidruntime(904): fatal exception: main 04-05 06:50:16.326: e/androidruntime(904): java.lang.illegalstateexception: not execute method of activity 04-05 06:50:16.326: e/androidruntime(904):  @ android.view.view$1.onclick(view.java:3591) 04-05 06:50:16.326: e/androidruntime(904):  @ android.view.view.performclick(view.java:4084) 04-05 06:50:16.326: e/androidruntime(904):  @ android.view.view$performclick.run(view.java:16966) 04-05 06:50:16.326: e/androidruntime(904):  @ android.os.handler.handlecallback(handler.java:615) 04-05 06:50:16.326: e/androidruntime(904):  @ android.os.handler.dispatchmessage(handler.java:92) 04-05 06:50:16.326: e/androidruntime(904):  @ android.os.looper.loop(looper.java:137) 04-05 06:50:16.326: e/androidruntime(904):  @ android.app.activitythread.main(activitythread.java:4745) 04-05 06:50:16.326: e/androidruntime(904):  @ java.lang.reflect.method.invokenative(native method) 04-05 06:50:16.326: e/androidruntime(904):  @ java.lang.reflect.method.invoke(method.java:511) 04-05 06:50:16.326: e/androidruntime(904):  @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:786) 04-05 06:50:16.326: e/androidruntime(904):  @ com.android.internal.os.zygoteinit.main(zygoteinit.java:553) 04-05 06:50:16.326: e/androidruntime(904):  @ dalvik.system.nativestart.main(native method) 04-05 06:50:16.326: e/androidruntime(904): caused by: java.lang.reflect.invocationtargetexception 04-05 06:50:16.326: e/androidruntime(904):  @ java.lang.reflect.method.invokenative(native method) 04-05 06:50:16.326: e/androidruntime(904):  @ java.lang.reflect.method.invoke(method.java:511) 04-05 06:50:16.326: e/androidruntime(904):  @ android.view.view$1.onclick(view.java:3586) 04-05 06:50:16.326: e/androidruntime(904):  ... 11 more 04-05 06:50:16.326: e/androidruntime(904): caused by: java.lang.nullpointerexception: argument 'applicationid' cannot null 04-05 06:50:16.326: e/androidruntime(904):  @ com.facebook.internal.validate.notnull(validate.java:29) 04-05 06:50:16.326: e/androidruntime(904):  @ com.facebook.session.<init>(session.java:224) 04-05 06:50:16.326: e/androidruntime(904):  @ com.facebook.session.<init>(session.java:213) 04-05 06:50:16.326: e/androidruntime(904):  @ com.facebook.session$builder.build(session.java:1454) 04-05 06:50:16.326: e/androidruntime(904):  @ com.facebook.session.openactivesession(session.java:863) 04-05 06:50:16.326: e/androidruntime(904):  @ com.facebook.session.openactivesession(session.java:805) 04-05 06:50:16.326: e/androidruntime(904):  @ com.example.mk2weibo.fb.facebooklogin(fb.java:45) 04-05 06:50:16.326: e/androidruntime(904):  @ com.example.mk2weibo.mainactivity.fbautotest(mainactivity.java:410) 04-05 06:50:16.326: e/androidruntime(904):  ... 14 more

read stacktrace:

4-05 06:50:16.326: e/androidruntime(904): caused by: java.lang.nullpointerexception: argument 'applicationid' cannot null

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