You will have to use the drawText method of the Canvas class.
Paint paint = new Paint();
canvas.drawPaint(paint);
paint.setColor(Color.BLACK);
paint.setTextSize(16);
canvas.drawText("My Text", x, y, paint);
Here’s the relevant documentation about it:
http://developer.android.com/reference/android/graphics/Canvas.html#drawText(java.lang.String, float, float, android.graphics.Paint)