每次我使用自定义 ListField 推送我的新屏幕时，行的大小都不是必须的。我尝试使用无效，但它什么也不做。
我不明白为什么，当我用焦点导航或屏幕变得不活动并返回时，列表以正确的方式显示。
public class AboutListField extends ListField implements ListFieldCallback {
private Vector rows;
EncodedImage _rateIcon = EncodedImage
.getEncodedImageResource("icon_rate.png");
EncodedImage _privacyIcon = EncodedImage
.getEncodedImageResource("icon_info.png");
EncodedImage _legalIcon = EncodedImage
.getEncodedImageResource("icon_ad.png");
EncodedImage _facebookIcon = EncodedImage
.getEncodedImageResource("icon_facebook.png");
EncodedImage _twitterIcon = EncodedImage
.getEncodedImageResource("icon_twitter.png");
private LabelField nameLabel;
public AboutListField() {
super(0, ListField.USE_ALL_WIDTH);
setRowHeight(60);
setCallback(this);
Font fontName = Font.getDefault().derive(Font.SERIF_STYLE, 8,
Ui.UNITS_pt);
rows = new Vector();
for (int i = 0; i < 5; i++) {
HorizontalManager row = new HorizontalManager();
switch (i) {
case 0:
row.add(new BitmapField(_rateIcon.getBitmap()));
nameLabel = new CustomLabelField("Valorar app", NON_FOCUSABLE,
Color.WHITE);
nameLabel.setFont(fontName);
row.add(nameLabel);
break;
case 1:
row.add(new BitmapField(_privacyIcon.getBitmap()));
nameLabel = new CustomLabelField("Política de privacidad",
NON_FOCUSABLE, Color.WHITE);
nameLabel.setFont(fontName);
row.add(nameLabel);
break;
case 2:
row.add(new BitmapField(_legalIcon.getBitmap()));
nameLabel = new CustomLabelField("Aviso Legal", NON_FOCUSABLE,
Color.WHITE);
nameLabel.setFont(fontName);
row.add(nameLabel);
break;
case 3:
row.add(new BitmapField(_facebookIcon.getBitmap()));
nameLabel = new CustomLabelField("Síguenos en Facebook",
NON_FOCUSABLE, Color.WHITE);
nameLabel.setFont(fontName);
row.add(nameLabel);
break;
case 4:
row.add(new BitmapField(_twitterIcon.getBitmap()));
nameLabel = new CustomLabelField("Síguenos en Twitter",
NON_FOCUSABLE, Color.WHITE);
nameLabel.setFont(fontName);
row.add(nameLabel);
break;
default:
break;
}
rows.addElement(row);
}
setSize(rows.size());
}
protected void drawFocus(Graphics graphics, boolean on) {
XYRect focusRect = new XYRect();
getFocusRect(focusRect);
boolean oldDrawStyleFocus = graphics
.isDrawingStyleSet(Graphics.DRAWSTYLE_FOCUS);
try {
if (on) {
// set the style so the fields in the row will update its color
// accordingly
graphics.setDrawingStyle(Graphics.DRAWSTYLE_FOCUS, true);
int oldColour = graphics.getColor();
try {
graphics.setColor(Constants.Colors.ORANGE_SELECTED);
graphics.fillRect(focusRect.x, focusRect.y,
focusRect.width, focusRect.height);
} finally {
graphics.setColor(oldColour);
}
// to draw the row again
drawListRow(this, graphics, getSelectedIndex(), focusRect.y,
focusRect.width);
}
} finally {
graphics.setDrawingStyle(Graphics.DRAWSTYLE_FOCUS,
oldDrawStyleFocus);
}
}
public void drawListRow(ListField listField, Graphics graphics, int index,
int y, int width) {
AboutListField aboutList = (AboutListField) listField;
HorizontalManager rowManager = (HorizontalManager) aboutList.rows
.elementAt(index);
rowManager.drawRow(graphics, 0, y, width, getRowHeight());
}
public Object get(ListField listField, int index) {
// TODO Auto-generated method stub
return null;
}
public int getPreferredWidth(ListField listField) {
// TODO Auto-generated method stub
return 0;
}
public int indexOfList(ListField listField, String prefix, int start) {
// TODO Auto-generated method stub
return 0;
}
public boolean navigationClick(int status, int time) {
switch (this.getSelectedIndex()) {
case 0:
//Valorar App
this.setSelectedIndex(0);
break;
case 1:
// Política de privacidad
InfosScreen policyScreen = new InfosScreen(InfosScreen.TYPE_PRIVACY);
UiApplication.getUiApplication().pushScreen(policyScreen);
this.setSelectedIndex(1);
break;
case 2:
// Aviso Legal
InfosScreen legalScreen = new InfosScreen(InfosScreen.TYPE_LEGAL);
UiApplication.getUiApplication().pushScreen(legalScreen);
this.setSelectedIndex(2);
break;
case 3:
// Facebook
this.setSelectedIndex(3);
break;
case 4:
// Twitter
this.setSelectedIndex(4);
break;
default:
break;
}
return super.navigationClick(status, time);
}
public class HorizontalManager extends Manager {
public HorizontalManager() {
super(0);
}
public void drawRow(Graphics g, int x, int y, int width, int height) {
// Arrange the cell fields within this row manager.
layout(width, height);
// Place this row manager within its enclosing list.
setPosition(x, y);
// Apply a translating/clipping transformation to the graphics
// context so that this row paints in the right area.
g.pushRegion(getExtent());
// Paint this manager's controlled fields.
subpaint(g);
g.setColor(0x00CACACA);
g.drawLine(0, 0, getPreferredWidth(), 0);
// Restore the graphics context.
g.popContext();
}
protected void sublayout(int width, int height) {
// set the size and position of each field.
int fontHeight = Font.getDefault().getHeight();
int preferredWidth = getPreferredWidth();
// start with the Bitmap Field of the Radio icon
Field field = getField(0);
layoutChild(field, _rateIcon.getWidth(), getRowHeight());
setPositionChild(field, 20,
(getHeight() / 2 - _rateIcon.getHeight() / 2));
// set the radio name label field
field = getField(1);
layoutChild(field, preferredWidth - 16, getRowHeight());
setPositionChild(field, _rateIcon.getWidth() + 40,
(getHeight() / 2 - fontHeight / 2));
setExtent(preferredWidth, getPreferredHeight());
}
// The preferred width of a row is defined by the list renderer.
public int getPreferredWidth() {
return Display.getWidth();
}
// The preferred height of a row is the "row height" as defined in the
// enclosing list.
public int getPreferredHeight() {
return getRowHeight();
}
}
}