Java Blackberry ListField:在更新期间保持行焦点
使用下面的代码刷新包含xml web服务中返回的数据的列表字段之后。但在刷新后或刷新时，它会将焦点设置为ListField中的第一行。我不想那样。我希望它在刷新后保持当前焦点，这样用户甚至不会知道有刷新Java Blackberry ListField:在更新期间保持行焦点,java,blackberry,java-me,Java,Blackberry,Java Me,使用下面的代码刷新包含xml web服务中返回的数据的列表字段之后。但在刷新后或刷新时，它会将焦点设置为ListField中的第一行。我不想那样。我希望它在刷新后保持当前焦点，这样用户甚至不会知道有刷新 protected void onUiEngineAttached(boolean attached) { if (attached) { // TODO: you might want to show some sort of animated /
protected void onUiEngineAttached(boolean attached) {
if (attached) {
// TODO: you might want to show some sort of animated
// progress UI here, so the user knows you are fetching data
Timer timer = new Timer();
// schedule the web service task to run every minute
timer.schedule(new WebServiceTask(), 0, 60*1000);
}
}
public MyScreen() {
setTitle("yQAforum");
listUsers.setEmptyString("No Users found", 0);
listUsers.setCallback(this);
add(listUsers);
}
private class WebServiceTask extends TimerTask {
public void run() {
//Fetch the xml from the web service
String wsReturnString = GlobalV.Fetch_Webservice("myDs");
//Parse returned xml
SAXParserImpl saxparser = new SAXParserImpl();
ByteArrayInputStream stream = new ByteArrayInputStream(wsReturnString.getBytes());
try {
saxparser.parse( stream, handler );
}
catch ( Exception e ) {
response.setText( "Unable to parse response.");
}
// now, update the UI back on the UI thread:
UiApplication.getUiApplication().invokeLater(new Runnable() {
public void run() {
//Return vector sze from the handler class
listUsers.setSize(handler.getItem().size());
// Note: if you don't see the list content update, you might need to call
// listUsers.invalidate();
// here to force a refresh. I can't remember if calling setSize() is enough.
}
});
}
}
webservicecask UiApplication.getUiApplication().invokeLater(new Runnable() {
public void run() {
int currentIndex = listUsers.getSelectedIndex();
int scrollPosition = getMainManager().getVerticalScroll();
//Return vector sze from the handler class
listUsers.setSize(handler.getItem().size());
listUsers.setSelectedIndex(currentIndex);
getMainManager().setVerticalScroll(scrollPosition);
}
});
在您在评论中发布的代码中，您调用了
setSelectedIndex（）getSelectedIndex（）getSelectedIndex（）setSelectedIndex（int index）MyScreenMainScreen垂直字段管理器WebServiceTask