Crash on button create

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Crash on button create

Postby lostgame » Mon Nov 16, 2009 9:34 pm

No matter what I do, anytime I create a new android project (I'm using the 1.5 SDK) and create just one button, imagebutton, or the like, and then try to reference it in code, I get a crash. I've worked the last 4 hours on trying to just create one button. Coming from iPhone development, where I could create an entire simple application in 4 hours, this is ridiculous. >.<

I've included all the needed imports, android.widget.button, etc.

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Using java Syntax Highlighting
  3. setContentView(R.layout.main);
  5.         Button loginButton;
  7.         loginButton = (Button) this.findViewById(;
  9.         loginButton.setOnClickListener((OnClickListener) this);
Parsed in 0.016 seconds, using GeSHi

Results no matter what in:

11-16 15:28:23.217: ERROR/AndroidRuntime(827): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.avidlifemedia.hotornot/com.avidlifemedia.hotornot.mainscreen}: java.lang.ClassCastException: com.avidlifemedia.hotornot.mainscreen

Followed by about 20 more errors, many of which LogCat won't even let me see, simply stating "...11 more."

What on earth? 11 more? How do I see those 11 more! They could be the solution to this 4-hour problem!

Never in my ten years of professional programming experience have I been so frustrated.
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Postby qlimax » Tue Nov 17, 2009 1:23 am

i think class cast error is because your class is not implementing OnClickListener interface...

when you implement this interface, this casting is not required

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Using java Syntax Highlighting
  1. (OnClickListener) this
Parsed in 0.011 seconds, using GeSHi

just set this as clicklistener, because
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Using java Syntax Highlighting
  1. this
Parsed in 0.011 seconds, using GeSHi
object is of the type onclicklistener (you must implements OnClickListener at the class level).


you can do the click stuff ,also without implemeting the clicklistener interface ->>declaring it "on the fly"


Syntax: [ Download ] [ Hide ]
Using java Syntax Highlighting
  1. loginButton.setOnClickListener(new OnClickListener() {
  3.                         public void onClick(View v) {
  4.                                 // do click stuff
  6.                         }
  7.                 });
Parsed in 0.011 seconds, using GeSHi

and if this does not work, can you post the full logcat error?

¯`·.¸¸.><((((º>¯`·.¸¸. ><((((º>
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Postby Kur1310 » Tue Nov 17, 2009 5:25 am

Hi lostgame,,
U might be getting the classcast exception because u might have taken an imagebutton in ur layout file and in java code u r trying to cast it in a button....
That might be ur problem.. Just check it out.... :shock:
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