Android, screwy behavior

Cant figure this out (am a noob) but I have a default activity that starts with just one image button, clicking that image button opens the second activity that contains a bunch of image buttons but only one has an onclick, this is the exact code:

<ImageButton android:src="@drawable/level1" 
                android:开发者_开发百科layout_width="wrap_content" android:id="@+id/imageButton1" 
                android:layout_height="wrap_content" 
                android:onClick="button_clicked1">
            </ImageButton>

in the java file this is my code:

public void button_clicked1(View v) {
    //text1.setText("clicked");
    //ib2.setImageResource(R.drawable.level5);
    }

The screwy part, if that above function is empty nothing happens but no matter what I put in the above function... for example even a simple settext like the above commented one, and it force closes on me :((

the full java file if you are interested: http://pastebin.com/W4sJUKXH

and the manifest file (as the problem might be there, like I said, am a noobie) http://pastebin.com/yEuG1su7

** Where i think the error is:

In the manifest file I only have declared the second activity, nothing else...

Set id for the ImageViews, this is how you handle many Buttons with one method

public void button_clicked1(View v) {

    switch(v.getId())
    {
      case R.id.myfirstimage:
         //do something
        break;
     case R.id.mysecondimage:
       // do something
      break;

  // add more cases


     default:
       // do something if none of the cases is your image view or do nothing
    }

    }

Set setContentView( ) before you do anything with the UI components. (Thats why you get some Exception)

 @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.start_levels_screen);
        text1 = (TextView) findViewById(R.id.textView1);
        ib2 = (ImageButton) findViewById(R.id.imageButton2);

    }