quick question pls reply

[kikoy87]

hello everyone, just a quick question.

if for example in one class I created a Image variable holding an image and changed from this class to another using Display.setCurrent(nxtdisplayable);.

will that image variable automatically set to null and free the memory?

I really need to know since when I ran my program on an emulator its working fine but when I ran it on N70 the game crashed after going to the main part of the game.

I tried removing the images used in this part of the game and it ran. But I need those images for the game so how do i solve this problem? Please help.

[juarezjunior]

Hi,

AFAIK, no. You must make sure the reference is released and nulled and use the showNotify() and hideNotify() methods to handle that. Besides, the enclosing class must be released as well.

The Java Garbage Collector will clean only objects that are not referenced anymore but if one ref exists, it will survive.

Br,

[amitmishra19]

Hi,

I think you can do one thing...write a method in your midlet class itself, say loadImages(), that will load the images you require throughout your application.

next, pass this midlet reference to all the displayable class that you are creating....all the images will be abailable to you..

here is the dummy code for your midlet-

public class MyMidlet extends MIDlet{

............
.......

public void loadImages()
{
imageOne=Image.createImage("/images/iconOne.png");
imageTwo=Image.createImage("/images/iconTwo.png");
imageThree=Image.createImage("/images/iconThree.png");
...........
}

}

next, in your diaplayable class you can have something like-

class MyCanvas extends Canvas
{
.......
MyMidlet parent;

MyCanvas(MyMidlet midlet,/*some other parameters*/)
{
parent=midlet
}

public void handlePaint(Graphics g)
{
...............
g.drawImage(parent.imageOne,10,20);
.....................
}
}


Hope this will solve your problem.

Regards

[raj_J2ME]

HI There,

Your image var will not be null and you have to put it null.
I Hope you dont need that var in next class so you put it null.

Else if you need that in next class then you can access that var of image through the MIDLET reference.

And the approach of the amitmishra is better,try tom follow that.Write loading and unloading the resource methods.Code will be simpler and control will be in yr hends.

public void loadInitealImages ( int gameState )
{
try
{
switch( gameState )
{
case LOGO_STATE:
logoAndSplashImg[0] = Image.createImage ("/logo.png"); // 1st Image to be appear
logoAndSplashImg[1] = Image.createImage ("/splash.png"); // 2nd Image to be appear
backLayer = Image.createImage ("/backGround.png"); // game BackGround
inGameBackLayer0 = Image.createImage ("/inGameBack0.png"); // In game BackGround
inGameBackLayer1 = Image.createImage ("/inGameBack1.png"); // In game BackGround
inGameBackLayer2 = Image.createImage ("/inGameBack2.png"); // In game BackGround

imgFontSmall_B = Image.createImage ("/font_small_black.png"); // In game small FONT BLACK
imgFontSmall_G = Image.createImage ("/font_small_gold.png"); // In game small FONT GOLD

fontBigImage_Black = Image.createImage ("/font_big_black.png"); // In game small FONT BLACK
fontBigImage_Gold = Image.createImage ("/font_big_gold.png"); // In game small FONT GOLD
break;

}
}

same for unloading() the images...


Regards

[kikoy87]

Greetings,

thanks for all your help everyone.

Your advices are really a great help in creating my game!