BlackBerry Device Optimization question

Hi, I have developed an application using ksoap2 to get data from the Web service, I show that the use of data directly on the screen in the gridfield. When we have records of 10-15 it takes hardly 20 to 25 seconds to display the data, but when tring to get the data more than 50 aircraft crashes. Please suggest me something to improve the speed of my application.

In this case seems to be your use of the event Thread.

First a little "tutorial".  When you change something that is currently displayed, the screen should be updated with your changes.  So, for example, if you change the font of a LabelField, this field must be adjusted.  Generally, this will change the size of the field, so the rest of the screen must be fitted.  So then the formatting of fields, giving them attributes such as fonts, margins and backgrounds, you should do this before you add the field to a Manager, especially if this Manager is already displayed.

So let's look at this code:

Grid.Add (new LabelField (Coll "of today", USE_ALL_WIDTH
| FOCUSABLE. Field.FIELD_LEFT) {}
protected void onDisplay() {}
TODO self-generating method stub
super.onDisplay ();
this.setPadding (3, 0, 3, 0);
Font myFont = Font.getDefault () .derive (Font.BOLD, 6,)
Ui.UNITS_pt);
this.setFont (myFont);
setBorder (BorderFactory.createSimpleBorder (new XYEdges)
0, 0, 2, 0), new XYEdges (0xC2C2C2, 0xC2C2C2,
0xC2C2C2, 0xC2C2C2), Border.STYLE_SOLID));
}
});

You add the field, and then, when it is displayed, you update the format of this field.  Thus, this code will new available screen (the screen remember because you may have pushed the fields further downwards or to the top of the screen) 4 times.  And this will be repeated for each field.

You could recode this in a way that is much more effective as:

LabelField newLabel = new LabelField (Coll "of today", USE_ALL_WIDTH
| FOCUSABLE. Field.FIELD_LEFT);
newLabel.setPadding (3, 0, 3, 0);
Font myFont = Font.getDefault () .derive (Font.BOLD, 6,)
Ui.UNITS_pt);
newLabel.setFont (myFont);
newLabel.setBorder (BorderFactory.createSimpleBorder (new XYEdges)
0, 0, 2, 0), new XYEdges (0xC2C2C2, 0xC2C2C2,
0xC2C2C2, 0xC2C2C2), Border.STYLE_SOLID));
}
});
Grid.Add (newLabel);

But this creates two additional objects whenever you don't need to create!  So create the police and the border once and use them for all areas.

There are similar efficiencies to your changes of focus - why the treatment stall every time a focus change two create two backgrounds when you can both create and reuse every time.

I suspect there are other savings to be made if you look hard.  Try to minimize the creation and operation of object code that will delay the user.

And I think if you make the above changes, your treatment will begin to fly (compared to anyway).

Let us know how you go.

Tags: BlackBerry Developers

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    Wow! You do your job, I admire that! I'll answer what I can...

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    N °

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    MirceaKitsune wrote:

    Yes, they are a lot of questions that may seem ridiculous. I got this phone for several years, so I want to know all about it. Thanks to all those who can help you meet them, and keep up the good work with phones

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    I'm going to agree with superdirt here.

    I have the 5.0 OS update of applications work well on OS 5.0, 6.0 and 7.0 of the OS OS phones.  I try not to recompile for levels of the OS, if I can, and so far I've been perfectly safe with OS 5.0 running on the later levels of the operating system.  So you should be able to get away with just using OS 5.0.

    Not that it is important for you, but I just thought I documents some historical information about level changes.  .

    As far as I know it 2 change cod in the file format, one to the 4.0 OS and the other in OS 4.2.  Therefore, if you want to run anything in OS 6.0 or above, it must be compiled in OS 4.2 or higher.  Again, I have applications compiled to OS 4.2 running on OS 6.0, without no problem devices.

    There have been changes to the API - the result is that the code that works in OS xx does not work in OS yy where yy is after xx.  I hit a few of them and have so far managed to rework the code so that it works very well on both levels of the operating system.  In general it is things that I do wrong anyway, as the older operating systems (from memory) are not as strict on when the event Thread must be used.

    The problem with OS 4.7 compatibility is an impact and to get more of this, for devices touch screen only, I compile using OS 4.7.  If an application that uses only the functionality that was available in the OS 4.2, I compile on OS 4.2 for non touch screen phones and OS 4.7 for touchscreen phones.  And everything works fine.

    I hope this helps.

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