J2ME procent baterie – Java – Fórum – Programujte.com

Ahoj potřebuji spolehlivé řešení jak získat počet procent baterie ( 0 - 100% ) mělo by to fungovat všude nebo alespoň na Nokie a Sonny Eriksónu dík

Mám tento kód 

value=Integer.parseInt(System.getProperty("com.nokia.mid.batterylevel"));
showFont(g, "-"+value, x+getWidth()-aFont.stringWidth(time)-5-20, y-heifon, aFonb);

ovšem píše to 

java.lang.NumberFormatException: null
	at java.lang.Integer.parseInt(+13)
	at java.lang.Integer.parseInt(+6)
	at Splash.paint(+219)
	at javax.microedition.lcdui.Canvas.callPaint(+80)
	at javax.microedition.lcdui.Display.repaint(+77)
	at javax.microedition.lcdui.Display.registerNewCurrent(+237)
	at javax.microedition.lcdui.Display.access$400(+6)
	at javax.microedition.lcdui.Display$DisplayAccessor.foregroundNotify(+46)
	at javax.microedition.lcdui.Display$DisplayManagerImpl.notifyWantsForeground(+152)
	at javax.microedition.lcdui.Display$DisplayManagerImpl.access$100(+6)
	at javax.microedition.lcdui.Display.setCurrentImpl(+115)
	at javax.microedition.lcdui.Display.setCurrent(+29)
	at android.startApp(+31)
	at javax.microedition.midlet.MIDletProxy.startApp(+7)
	at com.sun.midp.midlet.Scheduler.schedule(+270)
	at com.sun.midp.main.Main.runLocalClass(+28)
	at com.sun.midp.main.Main.main(+116)

Podla http://www.developer.nokia.com/Community/Wiki/CS001201_-_Checking_battery_level_in_Java_ME

Note that in Series 40 platform only signed MIDlets under operator domain can retrieve this information.