Introduction Tips and Tricks Tools Conclusion
Mobile and Wireless Systems Programming Programming methodology
Youssef RIDENE :
[email protected]
Mobile and Wireless Systems Programming
Introduction Tips and Tricks Tools Conclusion
Why a methodology ? Mobile properties
Small embedded systems Low effort for maintability Low memory and performance Power consumption Small screens
Mobile not Desktop !
Youssef RIDENE :
[email protected]
Mobile and Wireless Systems Programming
Introduction Tips and Tricks Tools Conclusion
Why a methodology ? Mobile properties
Profile Configuration Screen size Available Memory Available APIs Available media formats
Youssef RIDENE :
[email protected]
Mobile and Wireless Systems Programming
Introduction Tips and Tricks Tools Conclusion
Do it once Loops Variables Strings Arrays Input/Output UI Exceptions General
NOK double x = d ∗ ( l i m / max ) ∗ s x ; double y = d ∗ ( l i m / max ) ∗ s y ;
Youssef RIDENE :
[email protected]
Mobile and Wireless Systems Programming
Introduction Tips and Tricks Tools Conclusion
Do it once Loops Variables Strings Arrays Input/Output UI Exceptions General
NOK double x = d ∗ ( l i m / max ) ∗ s x ; double y = d ∗ ( l i m / max ) ∗ s y ; OK double xy = d ∗ ( l i m / max ) ; double x = xy ∗ s x ; double y = xy ∗ s y ;
Youssef RIDENE :
[email protected]
Mobile and Wireless Systems Programming
Introduction Tips and Tricks Tools Conclusion
Do it once Loops Variables Strings Arrays Input/Output UI Exceptions General
NOK double x = d ∗ ( l i m / max ) ∗ s x ; double y = d ∗ ( l i m / max ) ∗ s y ; OK double xy = d ∗ ( l i m / max ) ; double x = xy ∗ s x ; double y = xy ∗ s y ;
Youssef RIDENE :
[email protected]
Mobile and Wireless Systems Programming
Introduction Tips and Tricks Tools Conclusion
Do it once Loops Variables Strings Arrays Input/Output UI Exceptions General
NOK i n t MAX = 1 0 0 0 0 0 0 ; i n t [ ] Tab = new i n t [ 1 0 0 0 ] ; for
( i n t i = 0 ; i < Tab . l e n g t h ; Tab [ 0 ] = MAX; ...
i ++){
}
Youssef RIDENE :
[email protected]
Mobile and Wireless Systems Programming
Introduction Tips and Tricks Tools Conclusion
Do it once Loops Variables Strings Arrays Input/Output UI Exceptions General
NOK i n t MAX = 1 0 0 0 0 0 0 ; i n t [ ] Tab = new i n t [ 1 0 0 0 ] ; ( i n t i = 0 ; i < Tab . l e n g t h ; Tab [ 0 ] = MAX; ...
for
i ++){
}
OK i n t MAX = 1 0 0 0 0 0 0 ; i n t [ ] Tab = new i n t [ 1 0 0 0 ] ; for
( i n t i = 0 ; i < Tab . l e n g t h ; i f ( i ==0) Tab [ 0 ] = MAX; ...
i ++){
}
Youssef RIDENE :
[email protected]
Mobile and Wireless Systems Programming
Introduction Tips and Tricks Tools Conclusion
Do it once Loops Variables Strings Arrays Input/Output UI Exceptions General
NOK i n t MAX = 1 0 0 0 0 0 0 ; i n t [ ] Tab = new i n t [ 1 0 0 0 ] ; ( i n t i = 0 ; i < Tab . l e n g t h ; Tab [ 0 ] = MAX; ...
for
i ++){
}
OK i n t MAX = 1 0 0 0 0 0 0 ; i n t [ ] Tab = new i n t [ 1 0 0 0 ] ; for
( i n t i = 0 ; i < Tab . l e n g t h ; i f ( i ==0) Tab [ 0 ] = MAX; ...
i ++){
}
Youssef RIDENE :
[email protected]
Mobile and Wireless Systems Programming
Introduction Tips and Tricks Tools Conclusion
Do it once Loops Variables Strings Arrays Input/Output UI Exceptions General
NOK f o r ( i n t i = 0 ; i < x . l e n g t h ; i ++) x [ i ] ∗= Math . PI ∗ Math . c o s ( y ) ;
Youssef RIDENE :
[email protected]
Mobile and Wireless Systems Programming
Introduction Tips and Tricks Tools Conclusion
Do it once Loops Variables Strings Arrays Input/Output UI Exceptions General
NOK f o r ( i n t i = 0 ; i < x . l e n g t h ; i ++) x [ i ] ∗= Math . PI ∗ Math . c o s ( y ) ; OK double p i c o s y = Math . PI ∗ Math . c o s ( y ) ; f o r ( i n t i = 0 ; i < x . l e n g t h ; i ++) x [ i ] ∗= p i c o s y ;
Youssef RIDENE :
[email protected]
Mobile and Wireless Systems Programming
Introduction Tips and Tricks Tools Conclusion
Do it once Loops Variables Strings Arrays Input/Output UI Exceptions General
NOK f o r ( i n t i = 0 ; i < x . l e n g t h ; i ++) x [ i ] ∗= Math . PI ∗ Math . c o s ( y ) ; OK double p i c o s y = Math . PI ∗ Math . c o s ( y ) ; f o r ( i n t i = 0 ; i < x . l e n g t h ; i ++) x [ i ] ∗= p i c o s y ;
Youssef RIDENE :
[email protected]
Mobile and Wireless Systems Programming
Introduction Tips and Tricks Tools Conclusion
Do it once Loops Variables Strings Arrays Input/Output UI Exceptions General
NOK S t r i n g B u f f e r s t r B u f = new S t r i n g B u f f e r ( ) ; f o r ( i n t i = 0 ; i < t a i l l e ; i ++) { i f ( t [ i ] >= ’ 0 ’ && t [ i ] < ’ 5 ’ ) { s t r B u f += t [ i ] ; } }
Youssef RIDENE :
[email protected]
Mobile and Wireless Systems Programming
Introduction Tips and Tricks Tools Conclusion
Do it once Loops Variables Strings Arrays Input/Output UI Exceptions General
NOK S t r i n g B u f f e r s t r B u f = new S t r i n g B u f f e r ( ) ; f o r ( i n t i = 0 ; i < t a i l l e ; i ++) { i f ( t [ i ] >= ’ 0 ’ && t [ i ] < ’ 5 ’ ) { s t r B u f += t [ i ] ; } }
OK S t r i n g B u f f e r s t r B u f = new S t r i n g B u f f e r ( ) ; c h a r cBuf ; f o r ( i n t i = 0 ; i < t a i l l e ; i ++) { cBuf = t [ i ] ; i f ( c B u f >= ’ 0 ’ && c B u f < ’ 5 ’ ) { s t r B u f += c B u f ; } }
Youssef RIDENE :
[email protected]
Mobile and Wireless Systems Programming
Introduction Tips and Tricks Tools Conclusion
Do it once Loops Variables Strings Arrays Input/Output UI Exceptions General
NOK S t r i n g B u f f e r s t r B u f = new S t r i n g B u f f e r ( ) ; f o r ( i n t i = 0 ; i < t a i l l e ; i ++) { i f ( t [ i ] >= ’ 0 ’ && t [ i ] < ’ 5 ’ ) { s t r B u f += t [ i ] ; } }
OK S t r i n g B u f f e r s t r B u f = new S t r i n g B u f f e r ( ) ; c h a r cBuf ; f o r ( i n t i = 0 ; i < t a i l l e ; i ++) { cBuf = t [ i ] ; i f ( c B u f >= ’ 0 ’ && c B u f < ’ 5 ’ ) { s t r B u f += c B u f ; } }
Youssef RIDENE :
[email protected]
Mobile and Wireless Systems Programming
Introduction Tips and Tricks Tools Conclusion
Do it once Loops Variables Strings Arrays Input/Output UI Exceptions General
NOK i n t sum = 0 ; for ( int i = 0; i < v . size ( ) ; sum += v . e l e m e n t A t ( i ) ; }
i ++) {
Youssef RIDENE :
[email protected]
Mobile and Wireless Systems Programming
Introduction Tips and Tricks Tools Conclusion
Do it once Loops Variables Strings Arrays Input/Output UI Exceptions General
NOK i n t sum = 0 ; for ( int i = 0; i < v . size ( ) ; sum += v . e l e m e n t A t ( i ) ; }
i ++) {
OK i n t sum = 0 ; int size = v. size (); f o r ( i n t i = 0 ; i < s i z e ; i ++) { sum += v . e l e m e n t A t ( i ) ; }
Youssef RIDENE :
[email protected]
Mobile and Wireless Systems Programming
Introduction Tips and Tricks Tools Conclusion
Do it once Loops Variables Strings Arrays Input/Output UI Exceptions General
NOK i n t sum = 0 ; for ( int i = 0; i < v . size ( ) ; sum += v . e l e m e n t A t ( i ) ; }
i ++) {
OK i n t sum = 0 ; int size = v. size (); f o r ( i n t i = 0 ; i < s i z e ; i ++) { sum += v . e l e m e n t A t ( i ) ; }
Youssef RIDENE :
[email protected]
Mobile and Wireless Systems Programming
Introduction Tips and Tricks Tools Conclusion
Do it once Loops Variables Strings Arrays Input/Output UI Exceptions General
Forward loop l o n g s t a r t 1 = Sy s t em . c u r r e n t T i m e M i l l i s ( ) ; f o r ( i = 0 ; i
