avoid double click android button

To avoid double click, try it out the following option.

private long lastClickTime = 0;

View.OnClickListener buttonHandler = new View.OnClickListener() {
    public void onClick(View v) {
        // preventing double, using threshold of 1000 ms
        if (SystemClock.elapsedRealtime() - lastClickTime < 1000){
            return;
        }

        lastClickTime = SystemClock.elapsedRealtime();
    }
}