Sean, Please don't be sorry. I would be more than glad to hear any advices that you have to offer; it might come handy some other time. :)
What you have said is more of a convention and better practice to write safe and robust code. I am fine with that. My main problem is, even if I put a Hashtable in the Intent extras using putExtra(Serializable), when I fetch it[using getSerializableExtra(..)] I have to cast it to a HashMap and NOT Hashtable. If I cast it to a Hashtable, I get a ClassCastException. I am sure there must be some reason for this which I, unfortunately fail to understand. On Nov 13, 4:19 pm, Sean Hodges <[email protected]> wrote: > Sorry, I missed this mail, glad to hear you got it working. > > On Fri, Nov 13, 2009 at 11:07 AM, Samuh <[email protected]> wrote: > >> The ClassCastException means that the Java Runtime does not like your > >> request to convert a Serializable into a HashMap. > > > I understand the meaning of ClassCastException; I did skim through the > > Javadocs docs before posting here. > > The problem is: I am not casting Serializable to HashMap but a > > Hashtable. > > >> > Hashtable table = (Hashtable)getIntent().getSerializableExtra > >> > ("table"); > > > I put Hashtable in the Intent Extras() so I thought the cast was safe. > > > Thanks. > > > On Nov 13, 3:38 pm, Indicator Veritatis <[email protected]> wrote: > >> The ClassCastException means that the Java Runtime does not like your > >> request to convert a Serializable into a HashMap. What is less clear > >> is why: but the J2SE API docs give a pretty good clue when they say: > > >> "Thrown to indicate that the code has attempted to cast an object to a > >> subclass of which it is not an instance. " > >> (http://java.sun.com/j2se/1.4.2/docs/api/) > > >> On Nov 13, 1:32 am, Samuh <[email protected]> wrote: > > >> > I have a Hashtable, which, I need to pass to another activity. Since, > >> > Hashtable is Serializable, I am doing the following: > > >> > Hashtable mHashTable = new Hashtable(); > >> > // load values > > >> > Intent intent = new Intent(this,SecondActivity.class); > >> > intent.put("table",mHashTable); > > >> > startActivity(intent); > > >> > In the Second activity, I try to read the extras in OnCreate(..) as: > > >> > Hashtable table = (Hashtable)getIntent().getSerializableExtra > >> > ("table"); > > >> > I get ClassCastException at this line in Logcat: > > >> > 11-13 14:21:15.939: ERROR/AndroidRuntime(922): Caused by: > >> > java.lang.ClassCastException: java.util.HashMap > > >> > What is that I am missing or doing wrong here? > > >> > Please help. > > >> > Thanks.- Hide quoted text - > > >> - Show quoted text - > > > -- > > You received this message because you are subscribed to the Google > > Groups "Android Beginners" group. > > To post to this group, send email to [email protected] > > To unsubscribe from this group, send email to > > [email protected] > > For more options, visit this group at > >http://groups.google.com/group/android-beginners?hl=en > > -- You received this message because you are subscribed to the Google Groups "Android Beginners" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-beginners?hl=en
