How to detect if the Spinner is click open on Android

Question

I have a spinner and I want to detect when the user clicked on it. When the user clicks it open, I want to call an endpoint and then update the spinner with new data. But I couldn't figure out how to do this and results in infinite loop:

I call the API in here:

public View getDropDownView(int position, View convertView, ViewGroup parent) {
  // Call API here
  // Do render with old data.
}

when the API successes, I call the to update:

@Override
public void onSuccess(final Response response) {
  Helper.update(...);
}


public void update(...) {
  ...
  adapter.setItems(newData);
  adapter.notifyDataSetChanged();
}

and then this triggers getDropDownView() again. I couldn't figure out what else is called after the user clicks open the spinner besides getDropDownView() . How can I solve this problem?

Answer 1

You can set Touch-listener on Spinner to detect click.

 findViewById(R.id.spinner).setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            Toast.makeText(MainActivity.this,"CallAPI",Toast.LENGTH_SHORT).show();
            return false;
        }
    });

And return False from onTouch to behave normally.I hope It will work for you.