To catch a long click and use it you need to provide appropriate listener to button:
View.OnLongClickListener listener = new View.OnLongClickListener() {
public boolean onLongClick(View v) {
Button clickedButton = (Button) v;
String buttonText = clickedButton.getText().toString();
Log.v(TAG, "button long pressed --> " + buttonText);
return true;
}
};
button.setOnLongClickListener(listener);