hi, You can define animation effects in XML. Effects include <alpha> , <scale> , <rotate> etc... . u can also specify duration of each effects and other attributes. Refer to animation tutorial form android ApiDemos.
On Sun, Jul 26, 2009 at 1:33 PM, atharva chauthaiwale < [email protected]> wrote: > Hi, > > > > > On Sun, Jul 26, 2009 at 9:13 AM, az9702 <[email protected]> wrote: > >> >> Hi, >> >> I would like to implement a simple animation using View >> >> The animation involves drawing a rectangle (w =20px, h =10px) moving >> from left to right at a 10px increment. >> >> I have two questions: >> >> (1) As the rect moves along, the previous drawing needs to be erased >> so the rect appears moving along. >> >> My implementation erases by painting the previous rect with >> background color. This works but doubles the drawing. >> >> Is there a more efficient way of erasing previous rect ? >> >> (2) A time delay is also required between two drawings to show >> successive >> movement. Without the delay, only the final rect will appear >> drawn. >> >> My view class implements Runnable & has a Handler. >> The run method updates the Rect location & invalidates. >> I have a draw method that puts in the delay, like so: >> >> public void draw() { >> for(int i =0; i<20; i++) { >> handler.postDelayed(this, i*1000); //1 sec per drawing >> } >> } >> >> (1) & (2) cause the rect to go from left to right in 10px increment on >> 1-sec interval. >> >> As the animation is simple, I would like to use View (not SurfaceView >> or Animation) and it's OK to do all the work in UI thread. >> >> Is there a more efficient way than the one described above to >> implement this simple animation ? >> >> Suggestions & comments are appreciated. >> >> Thanks. >> >> >> >> >> >> > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Beginners" 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-beginners?hl=en -~----------~----~----~----~------~----~------~--~---
