Question

Sorry for the weird question, but is it possible to click on two buttons at the same time in android(having two logs, “clicked on b1” and “clicked on b2”), if one totally covers the other one?

Answer 1

This is not ordinarily possible; the top button will absorb the button click event and not pass it on to the one behind it. It is not clear whether or not you want to obtain this behaviour or avoid it, nonetheless, you can force it by propagating the event manually across the click listeners.

Here is one way (there are a few); assume buttonOne is on top of buttonTwo:

final Button buttonOne = (Button) findViewById(...);
final Button buttonTwo = (Button) findViewById(...);

buttonOne.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View v) {
       Log.d("ButtonTest", "ButtonOne clicked");
       buttonTwo.performClick();
    }
});

buttonTwo.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View v) {
       Log.d("ButtonTest", "ButtonTwo clicked");
    }
});

The click event enters the listener on button one, which then causes a click event on button two.

Here is another way which would work (and could be changed to support long click events easily):

final Button buttonOne = (Button) findViewById(...);
final Button buttonTwo = (Button) findViewById(...);

final OnClickListener listenerTwo = new OnClickListener() {
    @Override
    public void onClick(View v) {
       Log.d("ButtonTest", "ButtonTwo clicked");
    }
};

final OnClickListener listenerOne = new OnClickListener() {
    @Override
    public void onClick(View v) {
       Log.d("ButtonTest", "ButtonOne clicked");
       listenerTwo.onClick(buttonTwo);
    }
};

buttonOne.setOnClickListener(listenerOne);
buttonTwo.setOnClickListener(listenerTwo);