Android's drawing model is totally different, so it can provide a smoother experience without flicker. When drawing your window, you need to completely draw it and the result is not composited to the screen until all drawing is complete, so the user never seen flicker and artifacts due to partially drawn windows on screen.
You just need to learn how Android works. Yes, it does not use AWT, so you just need to learn the way that Android does drawing just like if you were coming from any other platform. On Tue, May 17, 2011 at 1:11 AM, Heuristic <[email protected]> wrote: > I write an Android Java program to "simulate" the moving of Tower of > Hanoi. > The drawing does not show in steps I expected, instead it shows in a > chunk at the end of the drawing. Why? > The scenario can been seen in my personal website - > 1. I set the disc number to be 5. > http://homepage8.seed.net.tw/web@3/heuristic/TOH_Set051411001.JPG > 2. Then, I start the moving. (I used the sleep timer so that it won't > move too fast.) > http://homepage8.seed.net.tw/web@3/heuristic/TOH_Start051411001.JPG > 3. It ends up with the BLACK piles of the discs on the two other > sticks as shown on the following URL: > http://homepage8.seed.net.tw/web@3/heuristic/TOH_End051411001.JPG > (This is due to an error in my program. It's fixed.) > > The button "start" is used to trigger the movement. I can see that the > button's color is changed and hold there until all the drawings are > done, then the color of the button is reset to original. This is not > what I want. I want to show - moving the disc 1 from stick 1 to stick > 2, then moving the disc 2 from stick 1 to stick 3, and so on. It does > not show this - it shows the last step that finishes the tower of > hanoi movement. > > I wrote this Java program long time ago using Java Applet (and it > works as an application with little modification). The library used to > draw is AWT only. Now, I just changed the interface to be Android GUI/ > API interface. > The old program works fine on my website (in fact, in my all > showoffs.) - > http://homepage8.seed.net.tw/web@3/heuristic/tohjava.html > > This program was developed on Android 2.1-updated. I just ported to > 3.0, it shows the first time, then halts there. I haven't got time to > figure out. > > This is a very good educational material - to teach Math, Java, > Computer Sciences, etc. > Hope experienced Android guy can share experience here. This is a > little bit like the "flush" in some i/o problem. Sometimes, if you > don't flush, there is no output. So, why Android does not show the > drawing out right away, instead it waits until the end of all the > drawings. > It looks like that using threads could solve the problem. But, it's > too much of the work for just drawing some object movings. Anyone has > any idea how to make the programming simpler and easier for a simple > task like this? > > How come Android not provide the AWT library? Is it too big or too > clumsy? It's just some simple drawings, why do you want your > developers to write so many codes for a simple task like this? > Is there a way that the displaying view (view to show the images) > sends a message to the button and asks the button to release the > control to the view so that the view can draw the drawings as it > should do. I think it's the button control holds the operation until > the called routine exits. Painting or drawing should be independent > of the processes that activate the painting or drawing like AWT, > right? > Any idea? > > -- > 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 > -- Dianne Hackborn Android framework engineer [email protected] Note: please don't send private questions to me, as I don't have time to provide private support, and so won't reply to such e-mails. All such questions should be posted on public forums, where I and others can see and answer them. -- 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
