Simple query about setOnClickListener() of android
<pre><code>View  firstButton   = findViewById ( R.id.button1 );    
firstButton.setOnClickListener(this);     
View secondButton = findViewById(R.id.button2);    
secondButton.setOnClickListener(this);
</code></pre>

<p>In the code what is refer to by <code>this</code> keyword whis is passed as a argument of <code>setOnClickListener()</code></p>
