scrolling canvas android

[jordandap]

Hello what I want to do is add a "scroll bar" to the right hand side of of the screen via java not XML layout how would I accomplish this?

preferably with comments so I can learn from it and not just copy + paste it in.

package com.jordan.t;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Align;
import android.graphics.Typeface;
import android.view.View;

public class Main extends View {

	Bitmap b1;
	Bitmap b2;
	Bitmap b3;
	Typeface font;
	
	public Main(Context context) {
		super(context);
		b1 = BitmapFactory.decodeResource(getResources(), R.drawable.blackwool);
		b2 = BitmapFactory.decodeResource(getResources(), R.drawable.bluewool);
		b3 = BitmapFactory.decodeResource(getResources(), R.drawable.brownwool);
		font = Typeface.createFromAsset(context.getAssets(), "G-Unit.TTF");
	}

	@Override
	protected void onDraw(Canvas canvas) {
		super.onDraw(canvas);
		canvas.drawColor(Color.WHITE);
		
		Paint textPaint = new Paint();
		textPaint.setARGB(50, 254, 10, 50);
		textPaint.setTextAlign(Align.LEFT);
		textPaint.setTextSize(30);
		textPaint.setTypeface(font);
		canvas.drawText("Black Wool", 0, 30, textPaint);
		canvas.drawText("Blue Wool", 0, 280, textPaint);
		canvas.drawText("Blue Wool", 0, 520, textPaint);
		canvas.drawBitmap(b1, 0, 50, null);
		canvas.drawBitmap(b2, 0, 290, null);
		canvas.drawBitmap(b3, 0, 530, null);
		invalidate();
	}
}

[jordandap]

Just wondering is this supposed to be here because it's been a few days loads of views but no comments . Is there a android section that I missed because I did not see one.