以下是示例代码：
class MailBoxSampleListField extends MainScreen implements FolderListener, StoreListener {
private static final int COLUMN_WIDTH_STATUS = 10;
private static final int COLUMN_WIDTH_DATE = 150;
private static final int COLUMN_WIDTH_NAME = 150;
public ListField myList;
private ListCallback myCallback;
public Vector sampleList = new Vector();
public Vector sampleVector;
private class ListCallback implements ListFieldCallback {
public Vector myVector = new Vector();
public Bitmap LIST_IMAGE = Bitmap.getBitmapResource("New.PNG");
public void drawListRow (ListField list, Graphics g, int index, int y,int w) {
displayList(g,0,y,w,(( Message )myVector.elementAt( index )), LIST_IMAGE); // for drawing the list row
for( int ii = 0; ii < sampleVector.size(); ii++) {
String text = ( String )sampleVector.elementAt(ii);
int liney = y + ( ii * list.getFont().getHeight() );
g.drawText( text, LIST_IMAGE.getWidth() + 5, liney, Graphics.ELLIPSIS, w );
}
}
public Object get( ListField list, int index ) {
return myVector.elementAt(index);
}
public int indexOfList( ListField list,String p, int s ) {
return myVector.indexOf(p,s);
}
public int getPreferredWidth ( ListField list ) {
return Graphics.getScreenWidth();
}
public void insert(Message _message, int index) {
myVector.addElement(_message);
}
public void erase () {
myVector.removeAllElements();
}
}
MailBoxSampleListField() {
ListCallback myCallback = new ListCallback();
try {
Store store = null;
store = Session.getDefaultInstance().getStore();
store.addStoreListener( this );
// retrieve Folder object fow which we want to receive message notification
try {
Folder[] folders = store.list();
Folder[] f1 = store.findFolder( "inbox" );
Folder vinbox = f1[0];
for (int i =0; i < f1.length; i++) {
f1[i].addFolderListener( this );
}
Message[] vmessages = vinbox.getMessages();
for ( int j = 0; j < vmessages.length; ++j ) {
if(vmessages[j] != null){
sampleList.addElement( vmessages[j] );
}
}
myList = new ListField(); // initialize the ListField
for ( int k = 0; k < sampleList.size(); k++ ) {
myList.insert(k);
myCallback.insert(vmessages[k], k);
}
myList.setCallback( myCallback );
add( myList );
}
catch( Exception e ){
}
}
catch ( Exception se ) {
}
}
public void displayList( Graphics g, int x, int y, int width, Message _message, Bitmap LIST_IMAGE ) {
g.drawBitmap(0, y, LIST_IMAGE.getWidth(), LIST_IMAGE.getHeight(), LIST_IMAGE, 0, 0);
sampleVector = new Vector();
Date d = _message.getReceivedDate();
Calendar c = Calendar.getInstance();
c.setTime(d);
StringBuffer sb = new StringBuffer();
sb.append( c.get( Calendar.MONTH ) );
sb.append('-');
int digit = c.get( Calendar.DAY_OF_MONTH );
if ( digit < 10 ) sb.append(0);
sb.append( digit );
sb.append(' ');
sb.append( c.get( Calendar.HOUR_OF_DAY ) );
sb.append(':');
digit = c.get( Calendar.MINUTE );
if ( digit < 10 ) sb.append( 0 );
sb.append( digit );
sb.append( ' ');
x += LIST_IMAGE.getWidth()+5;
x += COLUMN_WIDTH_DATE;
try {
String name = "<noname>";
if ( _message.isInbound() ) {
Address a = _message.getFrom();
if ( a != null )
{
name = a.getName();
if ( name == null || name.length() == 0 ) name = a.getAddr();
}
}
else
{
//get the first Recipient address
Address[] set = _message.getRecipients(Message.RecipientType.TO);
if ( set != null && set.length > 0 )
{
name = set[0].getName();
if ( name == null || name.length() == 0 ) name = set[0].getAddr();
}
}
sampleVector.addElement(name +" " + sb.toString());
} catch (MessagingException e) {
System.err.println(e);
}
x += COLUMN_WIDTH_NAME;
int remainingColumnWidth = Graphics.getScreenWidth() - x;
//get the subject, or if that doesn't exist, the first line of the body
String textToDisplay = _message.getSubject();
if ( null == textToDisplay) //no subject! get the first line of the body if present
{
Object o = _message.getContent();
if ( o instanceof String )
{
textToDisplay = (String)o;
}
else if ( o instanceof Multipart )
{
Multipart mp = (Multipart)o;
int count = mp.getCount();
for (int i = 0; i < count; ++i)
{
BodyPart p = mp.getBodyPart(i);
if ( p instanceof TextBodyPart )
{
textToDisplay = (String)p.getContent();
}
}
}
}
sampleVector.addElement(textToDisplay);
} public void messagesAdded(FolderEvent e) {} public void messagesRemoved(FolderEvent e) { } public void batchOperation( StoreEvent se) { }
}
答案 0 :(得分：0)
我不确定你的意思，请你发布截图，以便我们看到问题？
我会尽力帮助我。在我有限的经验中，我注意到在listfield中，如果你没有将行高（setRowHeight()）设置为足够大的高度，那么溢出该行大小的图形（包括文本）将不会显示。您是否尝试将行高设置为2 * list.getFont().getHeight()或更高？
答案 1 :(得分：0)
如果没有显示所有行，那么我认为你错过了调用 myList.setSize（myVector.size（））;
我不确定你的意思是“包装不发生”......
将重复调用drawListRow（）（由我上面建议的setSize（）设置的次数。）
在你当前的代码中，你在每个drawListRow（）调用中遍历整个myVector - 这是错误的。
答案 2 :(得分：0)
您必须使用在drawListRow中声明的值y（ListField list，Graphics g，int index， int y ，int w）
喜欢
g.drawText（text，LIST_IMAGE.getWidth（）+ 5，y+liney，Graphics.ELLIPSIS，w）
我长期面对这个问题终于得到了解决方案。
答案 3 :(得分：0)
正如亚历克斯所说，你需要实现自己的包装类，看起来像：
TextWrapper theWrapper = new TextWrapper();
String[] wrappedText = theWrapper.textWrap(longText, wrappingWidth , 2);
//
// now draw text line by line
//
g.drawText(wrappedText[0], x, y, DrawStyle.LEFT, width);
if (wrappedText.length > 1) {
g.drawText(wrappedText[1], x, y + textFont.getHeight(), DrawStyle.LEFT | DrawStyle.ELLIPSIS, width);
}
，其中
public class TextWrapper {
... // put here methods used by textWrap method
//
// textWrap splits input String in lines having width as maxWidth
//
public String[] textWrap(String s, int maxWidth, int maxLines)
{
String[] result;
... // do here the wrap job on input string s
return result;
}
}