ActivityNotFoundException unexpectedly

I am getting this error in my one activity and it is making no sense because I can go to the Calendar activity from another activity so I know i declared it correctly in the manifest

<activity android:name=".Calendar" android:label="Calendar"/>

Intent is in a Dialog selection

Intent ok = new Intent(Events.this,Calendar.class);
ok.addFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
startActivity(ok); //ActivityNotFoundException
finish();

I can from activity A to the Calendar activity just fine then the Calendar activity has access to my Events activity but I cant go from my Events to the Calendar activity??

Ideas as to why this is?

EDIT: Update with error

08-24 12:53:46.951: ERROR/AndroidRuntime(3045): FATAL EXCEPTION: main
08-24 12:53:46.951: ERROR/AndroidRuntime(3045): android.content.ActivityNotFoundException: Unable to find explicit activity class {com.app.notifyme/java.util.Calendar}; have you declared this activity in your AndroidManifest.xml?
08-24 12:53:46.951: ERROR/AndroidRuntime(3045):     at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1405)
08-24 12:53:46.951: ERROR/AndroidRuntime(3045):     at android.app.Instrumentation.execStartActivity(Instrumentation.java:1379)
08-24 12:53:46.951: ERROR/AndroidRuntime(3045):     at android.app.Activity.startActivityForResult(Activity.java:2827)
08-24 12:53:46.951: ERROR/AndroidRuntime(3045):     at android.app.Activity.startActivity(Activity.java:2933)
08-24 12:53:46.951: ERROR/AndroidRuntime(3045):     at com.app.notifyme.Events$12.onClick(Events.java:318)
08-24 12:53:46.951: ERROR/AndroidRuntime(3045):     at com.android.internal.app.AlertController$AlertParams$3.onItemClick(AlertController.java:873)
08-24 12:53:46.951: ERROR/AndroidRuntime(3045):     at android.widget.AdapterView.performItemClick(AdapterView.java:284)
08-24 12:53:46.951: ERROR/AndroidRuntime(3045):     at android.widget.ListView.performItemClick(ListView.java:3513)
08-24 12:53:46.951: ERROR/AndroidRuntime(3045):     at android.widget.AbsListView$PerformClick.run(AbsListView.java:1849)
08-24 12:53:46.951: ERROR/AndroidRuntime(3045):     at android.os.Handler.handleCallback(Handler.java:587)
08-24 12:53:46.951: ERROR/AndroidRuntime(3045):     at android.os.Handler.dispatchMessage(Handler.java:92)
08-24 12:53:46.951: ERROR/AndroidRuntime(3045):     at android.os.Looper.loop(Looper.java:123)
08-24 12:53:46.951: ERROR/AndroidRuntime(3045):     at android.app.ActivityThread.main(ActivityThread.java:3839)
08-24 12:53:46.951: ERROR/AndroidRuntime(3045):     at java.lang.reflect.Method.invokeNative(Native Method)
08-24 12:53:46.951: ERROR/AndroidRuntime(3045):     at java.lang.reflect.Method.invoke(Method.java:507)
08-24 12:53:46.951: ERROR/AndroidRuntime(3045):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
08-24 12:53:46.951: ERROR/AndroidRuntim开发者_运维百科e(3045):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
08-24 12:53:46.951: ERROR/AndroidRuntime(3045):     at dalvik.system.NativeStart.main(Native Method)

Import the correct package. I guess you are importing something like java.util.Calendar in your Events class.

If, for some reason, you need both Calendar classes (the one you wrote and the java.util one), you must put the complete path... for instance:

Intent ok = new Intent(Events.this, your.pkg.example.Calendar.class);

When you call finish() the system actually removes the activity from the stack.

This disallows you from going back to that activity.

I suggest you carefully read the Activity Lifecycle Documentation.

It should help you figure out your problem. :)

EDIT:

You should also not need that flag. Just start the activity, the system will take care of the rest.

You also do not have access to one activity from another activity. Each activity is a standalone unit that should not attempt to access other activities.

If you need to pass data between activities, use a static class/variable in a seperate class, or pass it using Intent.putExtra().