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Thursday, May 18, 2006

Hacking J2ME and google maps


Google maps tiles are PNG and about 15K. Both phones do not support PNG and JPG would be 19K-10K depending on compression. At street level resolution (zoom=2 gives street names, zoom=4 only avenues but covers most of Ile-de-Montreal in 3x3) 10x10=100 tiles would cover area from Papineu/Henri Boussa to Decarie/Park Kent and would take ~ 1.5M. So with less then 2-4M in storage, viewing SVG maps on the phone is not gonna work.

It doesn't work in smallest set-up - 2x2 tiles (~300K) on SE T610 218K of memory or pathetic Java runtime - Application Error, thought 400+K jar installs up fine. i-415 doesn't like to install jars larger then 400K and doesn't support PNG. The following table summarize my phones:

Phone Java Space Heap Canvas
SE T610 MIDP 1.0/no jad 2M 218K 128x127 Bluetooth, IR
i-415 MIDP 2.0/no PNG 4M? 1.0M 130x114 nothing
LG F9100 MIDP 2.0/no PNG 24M? 775K 128x144 nothing
On another note, SE doesn't support jad, so no multiple maps selection unless I use RMS, but since T610 doesn't load even 2x2, then what is the point? Continue hacking i-415 and buy LG F9100.
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Copyright © Aleksey Sudakov