lwuit | 易学教程

JavaME - LWUIT images eat up all the memory

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问题 I'm writing a MIDlet using LWUIT and images seem to eat up incredible amounts of memory. All the images I use are PNGs and are packed inside the JAR file. I load them using the standard Image.createImage(URL) method. The application has a number of forms and each has a couple of labels an buttons, however I am fairly certain that only the active form is kept in memory (I know it isn't very trustworthy, but Runtime.freeMemory() seems to confirm this). The application has worked well in 240x320

minimizing a mobile application on exit button press

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I am developing a mobile application using J2ME and LWUIT. Whenever the default exit Button (red in color) is pressed on a phone with symbian OS , I want my application to be minimized and not exited. How do i achieve this? According to Nokia documentation at http://library.developer.nokia.com/index.jsp?topic=/Java_Developers_Library/GUID-C5D3E0F5-72B9-4EE7-8BA7-20DE4A538FB8.html you can add the following jad key: Nokia-MIDlet-No-Exit. "Prevents the MIDlet from closing via pressing the End key. Instead of closing the MIDlet it is put to the background. The MIDlet can be still closed from the

how we can add LWUIT in android application?

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i used netbeans 6.5 for developing android application. i need to add LWUIT for this application. how we can add into this application? LWUIT is a library that works on MIDP. It is possible to get lwuit running on android through the use of the Activity class. Although no official port exists. An official Blackberry port does exist. and instructions can be found here: http://lwuit.blogspot.com/2009/11/building-project-on-blackberry.html There already is (for quite a while now) a native LWUIT port for Android contributed by community member Thorsten Schemm with instructions here: http://www

HashTable to Lwuit Table

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问题 Hashtable iHashtable=new Hashtable(); iHashtable.put("Name", "Jhon"); iHashtable.put("Address","India"); Enumeration iEnumeration=iHashtable.keys(); while(iEnumeration.hasMoreElements()) { Object iresult1=iEnumeration.nextElement(); String iresult2=(String) iHashtable.get(iresult1); System.out.println(iresult1); System.out.println(iresult2); My problem is I want to put the value at LWUIT table dynamically using the HashTable key and value,here is iresult1 and iresult2,using the key and value

Why arabic font not supported in Samsung mobiles using LWUIT?

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问题 I have tested my mobile application on some Samsung mobiles for testing purpose(Samsung Corby b3410 and Samsung c6712). Here Arabic font not showing on these mobiles. But it will working properly on Nokia mobiles. I'm using System font for showing Arabic fonts. Why its not supporting on these mobiles? How to resolve this issue? 回答1: LWUIT doesn't support Arabic bitmap fonts, when the font type is 'system' we just delegate the Arabic support to the underlying OS. If the underlying phone OS

How to display a Form Screen on LWUIT Tabs?

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问题 I have list items on form, I have to display that form on tabs, when the user clicked on a tab. How to add that form to tab, after form.show() or before? I need to display first tab as default with Form Screen? 回答1: You can display form in Tabs. Form is also a component. Form frmObj = new Form("Tabs Example"); Form frmOne = new Form("One"); Form frmTwo = new Form("Two"); Tabs tabObj = new Tabs(); tabObj.addTab("Form One",frmOne); tabObj.addTab("Form Two",frmTwo ); frmObj.addComponent(tabObj);

How to call Exit Command when I press Key # in Lwuit Mobile Application?

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问题 Can I assign the Exit Command to the # key in an Lwuit Application? When I press the key # , the Exit command should be called automatically and exit the application. 回答1: You should listen for a KeyPress or keyReleased event on the form with the keycode for # and exitApplication when the # key is pressed. protected void keyPressed(int key) { System.out.println("Key Pressed"); if(key==52) //change 52 to match keyCode for # key { Display.getInstance().exitApplication(); } } 来源： https:/

Is this possible to use lwuit.Dialog with javax.microedition.lcdui.Canvas in wireless toolkit 2.5.2?

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问题 I am using javax.microedition.lcdui.Canvas for drawing my string on the screen. But I also need one dialog window for some purpose. So I am using lwuit package ( com.sun.lwuit.Dialog ) for showing dialog window when key pressing. So in my program I just included that package and create the object of the Dialog box. While running my application, it is terminated unexpectedly. I just included the following lines... import javax.microedition.lcdui.Canvas; import com.sun.lwuit.Dialog; public

How to display a Form Screen on LWUIT Tabs?

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I have list items on form, I have to display that form on tabs, when the user clicked on a tab. How to add that form to tab, after form.show() or before? I need to display first tab as default with Form Screen? You can display form in Tabs. Form is also a component. Form frmObj = new Form("Tabs Example"); Form frmOne = new Form("One"); Form frmTwo = new Form("Two"); Tabs tabObj = new Tabs(); tabObj.addTab("Form One",frmOne); tabObj.addTab("Form Two",frmTwo ); frmObj.addComponent(tabObj); frmObj.show(); 来源： https://stackoverflow.com/questions/11862237/how-to-display-a-form-screen-on-lwuit-tabs

Multi Line Button in codename one

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问题 I have to display a text line as a button. The text of line is more then limit of line so when i display it in button it scroll the text rather then display multi line button. Please help to make it multi line. 回答1: You can use MultiButton but you will have to do linebreaks yourself. Alternatively you can use a TextArea which supports multi line and if you don't need the pressed state you can just set it to editable false and use setUIID("Button") to make it look like a button. If you need