onclick listener in android

Question

I used two image button for Next and Back and i used onclick event for those button i want to which image button fire on onclick and run particular function for next or back in onclick event how will i get which image button fire or onclick event at runtime

Answer 1

Use View.getId() to distinguish between different views that fire onClick events.

@Override
public void onClick(View view) {
    super.onClick(view);
    switch (view.getId()) {
    case R.id.download:
    //code..
    break;
    case R.id.play:
    //code..
    break;
    case R.id.pause:
        //code..
    break;
    default:
        //code..
    break;
    }
}

Answer 2

You can use anonymous inner classes to write an onClick function for each button.

Button button1 = getMyButton();
button1.setOnClickListener(new OnClickListener() {
   @Override
   public void onClick(View v) {
      // button 1 was clicked!
   }
  });
Button button2 = getMyButton();
button2.setOnClickListener(new OnClickListener() {
   @Override
   public void onClick(View v) {
      // button 2 was clicked!
   }
  });

As Konstantin mentioned, you can also use the passed in View and switch on the id. However, I find that a bit messier if you end up with lots of clickable things.

Answer 3

Hallo Mayra,

Do you know if you could use the same variable, 'button' to set up the listeners? Thereby saving a variable declaration, or do the variables have to remain in scope for the listeners to work?

e.g.

Button button;
button = getMyButton(); // get the first button
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
   // button 1 was clicked!
}
});
button = getMyButton(); // get the second button
button2.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
  // button 2 was clicked!
}
});

-Frink