Question

I have a ListView and each row contains button. I don’t want to assign to each button its own listener object, cause it will create a lot of objects. But the question is how to determine row number or contextual information when button is clicked?

Answer 1

Every View (including Button) can be “identified” via its setId(int) method.

When clicked you will be passed a view to a View.OnClickListener.onCLick(view). Just extract the ID and you’ll know which button this is.

When creating a button:

button.setId(1);

and when this button is clicked:

button.setOnClickListener( new OnClickListener() {
    public void onClick(View v) {
      int id = view.getId();
      // do something with the Id
    }
});

Update: answer was updated based on @Octavian Damiean’s comment: for identifying Views setId() should be used instead of setTag().