Question

I’ve seen this asked a thousand times in a thousand different ways, but still can’t get it to work…

I created a class which I’ve derived from ImageButton. I want to define my “on-click” behavior in the class.

I know I can do something inside my Activity’s onCreate like:

myButton b;
b = (myButton)findViewById(R.drawable.mybutton);
b.setOnClickListener(new View.OnClickListener() {
     ...etc...

but I want to define the code where it should be, in the derived class.

I first thought I could define it as:

 @Override public void onClick(View v) {

…but I get an error saying that I can’t use “@Override” here because “onClick” isn’t in the superclass. (When trying to remove “@Override”, it just builds and runs, but never gets called). I’ve also tried:

 @Override public void onClickListener(View v) {

…and several variants of “implements onClickListener” and “implements OnClickListener” to no avail.

This should be fairly simple – any ideas??

Answer 1

   b.setOnClickListener(new OnClickListener() {
      @Override
      public void onClick(View v) {
          derivedClassFunction(v);
      }
  });

   public void derivedClassFunction(View v) {
          /* code...*/
   }

Another way:

public class DerivedClass extends ImageButton implements View.OnClickListener {
    /*code...*/
    b.setOnClickListener(this);
    /*code...*/
    @Override
    public void onClick(View v) {
        /*code...*/
    }

}