How to make a variable button that you can click

I'm trying to make a game app that lets you click the green buttons and get rewarded or what ever and displays it and when you click a red button you loose. I've attempted to make a button for this app but cannot wrap my head around it. thank you everyone

public class Main extends Activity {
    DrawingView v;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
        v = new DrawingView(this);
        setContentView(v);

        Button redCircle = (Button) findViewById(Color.RED);

        redCircle.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Intent s = new Intent(Main.this, ifRed());
                startActivity(s);
            }

            private Class<?> ifRed() {
                // TODO Auto-generated method stub
                String str = "You clicked on a red circle. You Loose!";
                System.out.print(str);
                return null;
            }
        });
    }
}

and here is that class that randomly generates the circles

public class DrawingView extends View {
    public DrawingView(Context context) {
        super(context);
        // TODO Auto-generated constructor stub
    }

    private int lastColor = Color.BLACK;
    private final Random random = new Random();
    private final Paint paint = new Paint();
    private final int radius = 230;
    private final Handler handler = new Handler();

    private final Runnable updateCircle = new Runnable() {
        @Override 
        public void run() {
            lastColor = random.nextInt(2) == 1 ? Color.RED : Color.GREEN;
            paint.setColor(lastColor);
            invalidate();
            handler.postDelayed(this, 380);
        }
    };



    @Override 
    protected void onAttachedToWindow() {
        super.onAttachedToWindow();
        handler.post(updateCircle);
    }

    @Override 
    protected void onDetachedFromWindow() {
        super.onDetachedFromWindow();
        handler.removeCallbacks(updateCircle);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        // your other stuff here
        canvas.drawCircle(random.nextInt(canvas.getWidth()-radius/2) + radius/2f, random.nextInt(canvas.getHeight()-radius/2) + radius/2f, radius, paint);
    }


}