title: Android: Custom view Zoom/Pinch
body: <p>I've a running graph library developed with onDraw plotting the graph using canvas.drawLine methods. In onTouch I've implemented scroll functionality.</p>
  
  <p>Now my customer wants Zoom/Pinch. Is it possible to perform zoom/pinch on such a view without redrawing for these operations?</p>
  
  <p>What is the best way to implement this?</p>
  
  <p>Now next..
  How can I display Zooming indicators for this?? 
  I've some how managed to display scale of zoom (scaleFactor * 100). How will I show a zooming indicator? I can display static images using canvas.drawBitmap. But is there a more better way?</p>
  
  <p>Any help is appreciated</p>