Comments on: Playing with graphics in Android – Part IV

By: Shankar

Shankar — Tue, 23 Feb 2010 08:35:36 +0000

Hi Good Tutorial,

I have a doubt in Bitmap. I want to use different 10 Bitmaps,here which the way to use that Bitmaps.

Thanks,

By: cykan

cykan — Wed, 10 Feb 2010 15:55:02 +0000

Again, great tutorial!

By: Martin

Martin — Sun, 31 Jan 2010 14:28:50 +0000

Well, I wanted to make it the right way. The game loop of a game will do more than just the redrawing. So to introduce it correctly from the beginning, I used the thread.

Later the thread will handle update of physics or game logic.

By: brian

brian — Sun, 31 Jan 2010 14:11:32 +0000

Hello,

Nice tutorial you have and I’ve been following you since the start of this tutorial…Just now I have question which was just raised by one of the comment above. Why should we used or create another Thread which we called TutorialThread? Is using postInvalidate() inside the onTouchEvent() function to tell the Panel to redraw is not good? Just now I haved tried using postInvalidate() in redrawing the Panel without using Threads and it works the same but I just need any information maybe using Threads is more ok or lets just say the proper way around…if it is whats the advantage using threads in this scenario?

Thank you so much…Nice post.

-Brian

By: krebchak

krebchak — Wed, 06 Jan 2010 16:24:20 +0000

Great tutorial…one thing i noticed is the lack of good tutorials for android develoment. Glad you took the time.

Do you know how instead of handling a touch event you could move the bitmap by listening for SensorEvent? I have accomplished this with out any problems just using a view..but when i switch it to SurfaceView i am running into problems.

Thanks.

By: dg

dg — Sat, 12 Dec 2009 01:21:00 +0000

it’s clear
thank you

By: Martin

Martin — Thu, 10 Dec 2009 10:20:01 +0000

The SurfaceView is simply the way you should do 2D drawing.
A normal View is more for layouts you can do with by xml.

By: dg

dg — Wed, 09 Dec 2009 03:36:47 +0000

thanks a lot
but a question:
why u use a thread(TutorialThread invoke ondraw() ) to
repaint the View instead of

invalidate() ?

and i’m not familar with SurfaceView ,
is there any advantage than View ?

thank you

By: Martin

Martin — Mon, 07 Sep 2009 04:07:01 +0000

There are two possible solutions:
1. Simply remove the @Override annotations
2. (the better solution) update your java sdk to version 1.6

By: Fred

Fred — Sun, 06 Sep 2009 22:04:01 +0000

I get the following compile errors. Did I do something wrong?

The method surfaceCreated(SurfaceHolder) of type HelloAndroid.Panel must override a superclass method

The method surfaceDestroyed(SurfaceHolder) of type HelloAndroid.Panel must override a superclass method

The method surfaceChanged(SurfaceHolder, int, int, int) of type HelloAndroid.Panel must override a superclass method