Hi Parashar, If you really need to render with a high frame rate, I would recommend using SurfaceView. You can still draw on a Canvas object, but it is made for this purpose.
http://developer.android.com/guide/topics/graphics/index.html#on-surfaceview Regards, - Mike On Feb 4, 2:15 pm, Parashar <soilder.of....@gmail.com> wrote: > I am trying to perform basic task of rotating a canvas 20 times a > second using timer but it doesn't seem to be working properly and its > lagging. for example, if I rotate rectangle 0.3 degrees per 50 ms it > should rotate 6 degree in on second, but that is not the case. It > really slow in rotation. Here is my sample code: > > //Code for update task > class UpdateTimeTask extends TimerTask { > public void run() { > hndView.post(new Runnable() { > public void run() { > hndView.invalidate(); //this code invalidates > custom > view that calls onDraw to draw rotated hand > } > }); > } > > } > > //Code for onDraw method of custom view that needs to be update > @Override protected void onDraw(Canvas canvas) { > super.onDraw(canvas); > > ang = ang + inc; //ang is angle to rotate and inc is float > value of > 0.3 degree to be incremented > if (ang >= 360) ang = ang - 360; > canvas.rotate(ang, canvas.getWidth()/2, canvas.getHeight()/2); > canvas.drawRect((canvas.getWidth()/2 - 2), > (canvas.getHeight()/2 - > 125), (canvas.getWidth()/2 + 2), (canvas.getHeight()/2 + 10), > mTextPaint); > canvas.restore(); > > } > > //code to schedule task > Timer timer = new Timer(); > UpdateTimeTask tt = new UpdateTimeTask(); > timer.schedule(tt, 0, 50); > > Can anyone please tell me what am I doing wrong here? Should I used > different approach to perform this task? Because its hard to believe > that you cannot have simple smooth rotation of rectangle 20 times in > one second. -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
