* Skip the gesture detector, just handle the touch events yourself * Do not create a new bitmap. Load it once and blt from it to the surface * Background thread should wait on some object to be notified by UI thread when new x/y scroll is available, then draw
We use this approach in PhoneMyPC and have very responsive scrolling of quite large images. Scott SoftwareForMe.com On Thu, Nov 12, 2009 at 7:58 AM, Genc <[email protected]> wrote: > Hi all, > > For a project, I'm displaying an image with sizes 800 x 600 and I've > implemented my custom scrolling (horizontal and vertical) - which is > works fine. However, my problem is that it's not fast enough. If you > continuously move your finger on screen for instance, scrolling is not > responding fast enough. There is a lag and you need to wait (say > 400-500ms) for new scrolled image to be loaded. > > Now below I described how I implemented scrolling and my question is > that > > - How can I make it faster, if possible > - Is there any other better way to implement this. > > Thanks in advance!! > > -------------------------------------------------------- > > My custom scrolling solution: > > * I have a Main activity, SurfaceView and a thread > * In main activity, I'm using GestureDetector and override onScroll > method. > * In onScroll method of activity, I'm passing values to SurfaceView's > "handleScrolling" method. > * In "handleScrolling" method, I'm calculating proper values and using > "newImage = Bitmap.createBitmap(myImage, starX, stopY, SCREEN_WIDTH, > SCREEN_HEIGHT)"; to create a new, "scrolled" image. > > * Then in thread loop, I'm drawing this "newImage" to canvas. > > Hope this much info helps. > > -- > You received this message because you are subscribed to the Google > Groups "Android Developers" group. > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to > [email protected]<android-developers%[email protected]> > For more options, visit this group at > http://groups.google.com/group/android-developers?hl=en -- Warm regards, The PhoneMyPC Team -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
