[android help] Draw with ontouch based on menu selection

I have three menu items: Line, Circle, and Rectangle. I want to set it so that depending on the menu item selected, that shape/line is drawn when the user drags their finger across the screen(aka rubber banding). Here's LineDrawView.java:

// Project:         Java2Lab11_Lefelhocz
// File:            LineDrawView.java
// Date:            4/10/13
// Author:          Joshua Lefelhocz
// Description:     custom view to draw lines on

package com.lcc.java2lab12_lefelhocz;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.view.MotionEvent;
import android.view.View;

// Notice this class extends View
public class LineDrawView extends View 
{
// This view's bounds

@SuppressWarnings("unused")
private int xMin = 0;          
@SuppressWarnings("unused")
private int xMax;
@SuppressWarnings("unused")
private int yMin = 0;
@SuppressWarnings("unused")
private int yMax;
private float currentX;
private float currentY;
private float startX;
private float endX;
private float startY;
private float endY;
// Paint object
private Paint paintFill;

// constructor
public LineDrawView(Context context) 
{
    // call the super class constructor
    super(context);

    // The Paint class holds the style and color information about how to draw geometries, text and bitmaps.
    // For efficiency create the paint objects in the constructor, not in draw
    // paint.setStrokeWidth(10); // works on lines
    // You can change the color of Paint without effecting objects already drawn
    // You can NOT change the style of Paint without effecting objects already drawn
    // The Style, TextSize apply to all objects drawn with the paint.

    // Create a default Paint object Style=Fill
    paintFill = new Paint();

    // set the background color when the view is created
    this.setBackgroundColor(Color.LTGRAY);  
}

// Called to draw the view. Also called by invalidate().
@Override
protected void onDraw(Canvas canvas) 
{



    paintFill.setColor(Color.BLACK);
    canvas.drawLine(startX, startY, endX, endY, paintFill);

}

// Called when the view is first created or its size changes.
@Override
public void onSizeChanged(int width, int height, int oldWidth, int oldHeight) 
{
    // Set the view bounds
    xMax = width-1;
    yMax = height-1;
}

public boolean onTouchEvent(MotionEvent event)
{
    currentX = event.getX();
    currentY = event.getY();



    switch(event.getAction())
    {   
    case MotionEvent.ACTION_DOWN:
        startX = currentX;
        startY = currentY;
        return true;
    case MotionEvent.ACTION_MOVE:
    endX = currentX;
    endY = currentY;
    invalidate();
        return true;
    case MotionEvent.ACTION_UP:


        return true;
    }
    return super.onTouchEvent(event);
}
}

Extra details: I am starting to get it to work, but am having trouble making the distance formula {sqrt(x2-x1)^2 + (y2-y1)^2)}

.

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