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Java Forum / General / June 2005J2ME, MIDP1.0 - Text input in low level graphics api (Canvas)
Hi! I'm making a game in j2me, that should be midp1.0 compatabile. The thing is, that I need to let user type some text (name on the highscore screen etc). Is there something I could use, or I have to solwe this myself? (with some sort of timers or smth) Thanks Nikola > I'm making a game in j2me, that should be midp1.0 compatabile. The > thing > is, that I need to let user type some text (name on the highscore > screen > etc). Have a look at javax.microedition.lcdui.* .. there you will find a class TextBox (which is a whole Screen) and TextField (which is just an item to be put on a Form). Not sure where you can find the docs online, but here they where installed with Sony Ericsson's J2ME SDK. hth!  Signaturejb (reply address in rot13, unscramble first) I'm aiming for fancy graph. fonts, background image and so on... Can I use those elements withiut defining them in a form? (I've used them with forms before, but not with Canvas) >>I'm making a game in j2me, that should be midp1.0 compatabile. The >>thing [quoted text clipped - 10 lines] > > hth! > I'm aiming for fancy graph. fonts, background image and so on... > > Can I use those elements withiut defining them in a form? (I've used > them with forms before, but not with Canvas) Then you do will have to roll your own, I'm afraid. The only annoyance you will encounter, is having to take care of the phone differences yourself. For example, the space is entered differently on Nokia and Sony Ericsson phones. I am currently doing something similar (my own menu on a Canvas, where you will be able to inline-edit part of the menu item) and also had to create a mapping function, which (based on the phone type specified by the user) returns the value of the space key. Maybe you know a better solution to this .. if so, I'd be glad to hear from you :) regards Signaturejb (reply address in rot13, unscramble first) Unfortuanately, no. Maybe one coud play aorund with game_action or however it was called (forgott), but I don't believe it'll work. Im doomed to taking care of the models anyway, since I couldn't figure out how to handle different screen sizes. Any tipps on that? :) Cheers Nikola >>I'm aiming for fancy graph. fonts, background image and so on... >> [quoted text clipped - 12 lines] > > regards > Unfortuanately, no. Maybe one coud play aorund with game_action or > however it was called (forgott), but I don't believe it'll work. Well, I am sort of using that. First, if I have a known phone, I check for the hardcoded keyCodes (for example, -11 is the back key on K700i) and map that to a more general identifier. Currently, I am mapping it to GAME_A-D, but I guess that is not such a good idea .. so maybe I will create my own general key identifiers. > Im doomed to taking care of the models anyway, since I couldn't figure > out how to handle different screen sizes. > Any tipps on that? :) Well, the Canvas has getWidth and getHeight member functions. They return the size of the Canvas, so the result will differ, depending on if you are in fullscreen or not. regards Signaturejb (reply address in rot13, unscramble first) > Well, I am sort of using that. First, if I have a known phone, [..] and if I don't, I fall back to getGameAction .. just to complete the sentence ;) Signaturejb (reply address in rot13, unscramble first) > Then you do will have to roll your own, I'm afraid. The only > annoyance you will encounter, is having to take care of the phone [quoted text clipped - 5 lines] > key. Maybe you know a better solution to this .. if so, I'd be glad to > hear from you :) Why are you doing that? The implementation should be passing the keycode to Canvas.keyPressed as an int which will convert to an alphanumeric character depending on the platform. The problem you'll face is how long to wait between keystrokes to consider the next one to be a new character and not just the last one pressed being advanced; i.e., "ab" and not just "b". SignatureDarryl L. Pierce <mcpierce@gmail.com> Visit my homepage: http://mcpierce.multiply.com "By doubting we come to inquiry, through inquiry truth." - Peter Abelard >> [..] had to create a mapping function, which (based on the phone type >> specified by the user) [..] > Why are you doing that? The implementation should be passing the > keycode to Canvas.keyPressed as an int which will convert to an > alphanumeric character depending on the platform. The problem you'll > face is how long to wait between keystrokes to consider the next one > to be a new character and not just the last one pressed being > advanced; i.e., "ab" and not just "b". Right, for letters, this is not a problem, as this is standardized. Problem arises when you want to enter a space. Nokia uses the 0, Siemens the 1, Sony Ericsson the # key. Other differences include punctuation-, Umlaut- or other special characters in the French or Spanish alphabet, as well as the key for switching between Caps and nocaps. regards Signaturejb (reply address in rot13, unscramble first) >>Why are you doing that? The implementation should be passing the >>keycode to Canvas.keyPressed as an int which will convert to an [quoted text clipped - 8 lines] > Umlaut- or other special characters in the French or Spanish alphabet, > as well as the key for switching between Caps and nocaps. Have you tested this? The handset is supposed to pass to Canvas.keyPressed the ASCII value for the key pressed, which includes spaces, etc. SignatureDarryl L. Pierce <mcpierce@gmail.com> Visit my homepage: http://mcpierce.multiply.com "By doubting we come to inquiry, through inquiry truth." - Peter Abelard >>>Why are you doing that? The implementation should be passing the >>>keycode to Canvas.keyPressed as an int which will convert to an [quoted text clipped - 13 lines] > Canvas.keyPressed the ASCII value for the key pressed, which includes > spaces, etc. Yes, but instead of passing 32 for the space, it passes the ASCII codes of the characters on the key (ie. 35 for # etc). Not sure if this is a unique 'feature' of Sony Ericsson phones, but its enough to make me use a mapping for the space. I am also mapping the 'Shift' key this way. While we are at it, there are also softkeys, which I want to use as well, but: Using Canvas.getGameAction does not return any usable values for those (always 0). According to the docs, I shall not use the hardcoded values for those keys, but is exactly what I am doing now. Otherwise, I see no way of being able to catch those keys. Maybe you have a better idea tod o this.. ? regards Signaturejb (reply address in rot13, unscramble first) Well, I could do that somehow with running this in a separate thread or so, I still need to think about it. Is there anything like that in MIDP 2.0 ? >> Then you do will have to roll your own, I'm afraid. The only >> annoyance you will encounter, is having to take care of the phone [quoted text clipped - 12 lines] > character and not just the last one pressed being advanced; i.e., "ab" > and not just "b". [top posting rearranged] >> [..] how long >> to wait between keystrokes to consider the next one to be a new >> character and not just the last one pressed being advanced; i.e., >> "ab" >> and not just "b". > Well, I could do that somehow with running this in a separate thread > or > so, I still need to think about it. > Is there anything like that in MIDP 2.0 ? An alternative will be to use System.currentTimeMillis () and store the time the last keystroke occured. So in each call to keyPressed you know how long it has been since the previous keystroke occured. Saves you the resources needed for a new thread :) regards Signaturejb (reply address in rot13, unscramble first) Thats also an option. I had that one in mind, but not as a clear idea. Anyway, then I wont be able to have the poiner or somethig thar resembles one... hope the ones above wont think of it ;) Thanks ! > [top posting rearranged] > [quoted text clipped - 15 lines] > > regards > I'm aiming for fancy graph. fonts, background image and so on... Then you will have to write your own widget to do the work. > Can I use those elements withiut defining them in a form? (I've used > them with forms before, but not with Canvas) No, you can't. Items (TextField, etc.) can only be realized in a Form. SignatureDarryl L. Pierce <mcpierce@gmail.com> Visit my homepage: http://mcpierce.multiply.com "By doubting we come to inquiry, through inquiry truth." - Peter Abelard > I'm making a game in j2me, that should be midp1.0 compatabile. The thing > is, that I need to let user type some text (name on the highscore screen > etc). > > Is there something I could use, or I have to solwe this myself? > (with some sort of timers or smth) You can put a TextField into a Form and use that, and it would be very portable. But, you will not be able to have graphics on the screen or anything of that sort. If you want to put an input field into one of your graphical screens, you will have to roll your own input widget and handle validation, keycode translations, etc. yourself. SignatureDarryl L. Pierce <mcpierce@gmail.com> Visit my homepage: http://mcpierce.multiply.com "By doubting we come to inquiry, through inquiry truth." - Peter Abelard Free MagazinesGet these publications absolutely FREE for up to 12 months. 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