canvas not redrawing correctly
<p>I am writing a simple view that will show a dot, after some action, show the next dot.  The dots are on a vertical strip.  so I create a function that'll clear the strip.  then draw a circle at the position where I want the dot. the code segment is as followed.</p>

<pre><code>private void clear_strip(){
    paint.setColor(Color.BLACK);
    paint.setStyle(Paint.Style.FILL_AND_STROKE);
    m_canvas.drawRect( 0, 0,width/8, height, paint);
    paint.setColor(Color.GREEN);
}

private void set_dot(){
    clear_strip();
    m_canvas.drawCircle(width/10, (int) (font_height*(scoreboard.current_batter_position()+0.5))/1, font_height/4, paint);
}

@Override
protected void onDraw(Canvas canvas) {
    set_dot();
    canvas.drawBitmap(m_bitmap, 0, 0, paint);
}
</code></pre>

<p>but one of the dot is just not updating.  It'll keep the old dot, skip that dot, then move to the next dot.  I tried to print out the position to logcat right before the drawCircle call, and the position is right, it's just not drawing (and not clearing as well)....please advise.</p>
