Easy way to setOnClickListener() on all Activity Buttons
<p>New to android development, but not entirely new to Java. Right now my code inside the onCreate() method is quite basic:</p>

<pre><code>    Button b1 = (Button) findViewById(R.id.button1);
    Button b2 = (Button) findViewById(R.id.button2);
    Button b3 = (Button) findViewById(R.id.button3);
    Button b4 = (Button) findViewById(R.id.button4);
    Button b5 = (Button) findViewById(R.id.button5);
    Button b6 = (Button) findViewById(R.id.button6);
    Button b7 = (Button) findViewById(R.id.button7);
    Button b8 = (Button) findViewById(R.id.button8);
    Button b9 = (Button) findViewById(R.id.button9);
    Button b10 = (Button) findViewById(R.id.button10);
    Button b11 = (Button) findViewById(R.id.button11);
    Button b12 = (Button) findViewById(R.id.button12);
    Button b13 = (Button) findViewById(R.id.button13);
    Button b14 = (Button) findViewById(R.id.button14);
    Button b15 = (Button) findViewById(R.id.button15);
    Button sqrt = (Button) findViewById(R.id.button16);
    Button b17 = (Button) findViewById(R.id.button17);
    Button b18 = (Button) findViewById(R.id.button18);
    Button b19 = (Button) findViewById(R.id.button19);
    Button b20 = (Button) findViewById(R.id.button20);
    b1.setOnClickListener(this);
    b2.setOnClickListener(this);
    b3.setOnClickListener(this);
    b4.setOnClickListener(this);
    b5.setOnClickListener(this);
    b6.setOnClickListener(this);
    b7.setOnClickListener(this);
    b8.setOnClickListener(this);
    b9.setOnClickListener(this);
    b10.setOnClickListener(this);
    b11.setOnClickListener(this);
    b12.setOnClickListener(this);
    b13.setOnClickListener(this);
    b14.setOnClickListener(this);
    b15.setOnClickListener(this);
    sqrt.setOnClickListener(this);
    b17.setOnClickListener(this);
    b18.setOnClickListener(this);
    b19.setOnClickListener(this);
    b20.setOnClickListener(this);
</code></pre>

<p>Surely there is an easier way than this. I attempted a simple for loop, but the id values of the buttons do not suit an increment of 'i'.  Do I have to change the id values to make this method possible, or is there an easier way?</p>

<p>If it's relevant, I'm using the latest version of the Android SDK, plugin for Eclipse and the target version number is 2.3.3</p>
