R – Double buffering in BlackBerry

blackberrydoublebuffereddrawinggraphics

Do we need to do double buffering in BlackBerry while rendering our paint code or does BlackBerry handle that? If we need to do that ourselves, how do we do that?

Best Answer

Just like Richard said,

Although there is a need to perform explicit double buffering in Mobile Information Device Profile (MIDP) applications, the BlackBerry user interface (UI) implementation is inherently double-buffered. This means there is no need to perform your own double buffering of UI images. Essentially, all drawing functions in net.rim.device.api.ui.Graphics objects are drawn to an off-screen bitmap by the system. When you call for a repaint of the screen, it draws this off-screen bitmap instead of sequentially painting the screen. This same drawing paradigm is true for all fields and field managers within the Blackberry UI.

BlackBerry KB - How do I perform double buffering using the BlackBerry UI?

Related Solutions

C# – Double buffering C#

Form class has DoubleBuffered property exposed as protected. http://msdn.microsoft.com/en-us/library/system.windows.forms.control.doublebuffered.aspx but since you derive your form from Form you can use it.

Java – Implementing Double Buffering in Java

First of all, you should avoid mixing heavy- and lightweight components (AWT and SWING), mostly because they use very different methods of drawing to the display (read here if you want to know more).

So instead of the Canvas, you could use a JPanel. This also gives you a potential solution, because JPanel has a method setDoubleBuffered(boolean), more specifically, this is implemented in the JComponent class.

I believe it would be sufficient to just replace

public class myCanvas extends Canvas

public class myCanvas extends JPanel

. Although I haven't tested this, I hope it helps you!

EDIT: Also, of course, when setting up your frame and canvas in the main method, you'd have to place the method call

canvas.setDoubleBuffered(true);

somewhere.

Best Answer

Related Solutions

C# – Double buffering C#

Java – Implementing Double Buffering in Java

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