[英]LWUIT List works terribly slow
我遇到了LWUIT中眾所周知的問題。 我的帶有復選框渲染器的列表組件滾動非常慢。 如果要在模擬器上測試我的應用程序,它將運行得非常平穩(盡管我看到滾動操作期間CPU利用率會高達60%),但是如果要在手機上運行它,則焦點移動之間需要花費幾秒鍾的時間。
有一個渲染器代碼:
public class CheckBoxMultiselectRenderer extends CheckBox implements ListCellRenderer {
public CheckBoxMultiselectRenderer() {
super("");
}
//override
public void repaint() {
}
public Component getListCellRendererComponent(List list, Object value,
int index,boolean isSelected) {
Location loc = (Location)value;
setText(loc.getLocationName());
setFocus(isSelected);
setSelected(loc.isSelected());
return this;
}
public Component getListFocusComponent(List list) {
setText("");
setFocus(true);
getStyle().setBgTransparency(Consts.BG_TRANSPARENCY);
return this;
}
}
那是我包含列表的表單的代碼:
protected void createMarkup() {
Form form = getForm();
form.setLayout(new BorderLayout());
form.setScrollable(false);
Label title = new Label("Choose location zone:");
title.getStyle().setMargin(5, 5, 0, 0);
title.getStyle().setBgTransparency(Consts.BG_TRANSPARENCY);
title.setAlignment(Component.CENTER);
form.addComponent(BorderLayout.NORTH, title);
list = new List(StateKeeper.getLocationsAsList());
list.setFixedSelection(List.FIXED_NONE_CYCLIC);
// list.setSmoothScrolling(true);
list.getStyle().setBgTransparency(0);
list.setListCellRenderer(new CheckBoxMultiselectRenderer());
list.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
// List l = (List)ae.getSource();
// l.requestFocus();
// l.setHandlesInput(true);
Location selItem = (Location)list.getSelectedItem();
selItem.setSelected(!selItem.isSelected());
}
});
form.addComponent(BorderLayout.CENTER, list);
}
我將非常感謝您的幫助!
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