To render to a SurfaceView you need to get the SurfaceHolder, lock it and then draw to the Canvas and finally unlock it.
Have you considered an ImageView and just calling invalidate and doing your drawing in onDraw? Lee On Fri, Nov 13, 2009 at 9:32 AM, Genc <[email protected]> wrote: > Hi Scott. > > Thanks for great tips. > > I've changed my code and not using Gestures any more, just onTouch > method and handling ACTION_MOVE motion. > > It's good up to this point. > > However, can you give a little sample code about blting a bitmap to > surface? How can I do this? > > Thanks > > On Nov 12, 8:18 pm, "SoftwareForMe.com SoftwareForMe.com" > <[email protected]> wrote: > > * 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]> > <android-developers%[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]<android-developers%[email protected]> > For more options, visit this group at > http://groups.google.com/group/android-developers?hl=en > -- 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
