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Asked: 2026-05-10T22:40:34+00:00

I programmed a bluetooth Television-Remote control for cellphones in J2ME using javax.microedition.lcdui.* (Gauge, List,

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I programmed a bluetooth Television-Remote control for cellphones in J2ME using javax.microedition.lcdui.* (Gauge, List, ChoiseGroup) GUI-Elements.

I want the cellphone to have real-time interaction with my Television, I would like to find way to send user inputs performed with the GUI-Elements immediately (like changing the channel, or changing the volume) to the Television.

Since I want real-time interaction with my Television, I would like to find way to send user inputs performed with the GUI-Elements immediately (e.g. changing the channel, or changing the volume) to the TV.

Using javax.microedition.lcdui.Command / CommandListner and commandAction won’t work since these need only recognize the commands selected with the side buttons. I would like to have something that can recognize any key pressed.

I discovered that Javax.microedition.lcdui.Canvas.keyPressed can handle any key pressed on the cellphone, but I don’t know how to make Canvas work with MIDP GUI elements like Gauge. They can’t be added like Commands.

Do I have to figure out way to build a interface for these GUI elements to make them work with Canvas?

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  1. I just found a half solution myself, if anyone is interested: ‘javax.microedition.lcdui.ItemStateListener’. This function can handle the states (or state changes) of the GUI items in realtime. Its not keyPress, but this will work as well for my application.

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