update - answer to question in comments

Question

在我试图在信道上建立一个检查箱时,我遇到麻烦。

我的检查箱运转良好,但我不知道如何储存每个项目的价值,这意味着当用户检查第1行时,然后转到另一个浏览箱,仍然检查第1行和2行的用户,然后转到另一行,检查箱将检查第1和第2行。

但我无法找到解决这一问题的办法。

Answer 1

修改您的代码,以使用。 about array array



    // ...initialization of DataList
    boolean[] selectTodelete = new boolean[2]; // instead of int
    { selectTodelete[0] = selectTodelete[1] = false; } // init array
    Command editCommand, backCommand,selectCmd, unselectCmd,selectAll;
    //...

    protected void paint(Graphics g) {
        //...
        for(int i =0 ; i<countRow; i++ ){
            //draw background
            //...
                     if(selectTodelete[i]){ // was selectTodelete == 1
                            //draw select dot at location for row  i 
                            //...
                     }
            // remove: you don t need that anymore: if(selectTodelete == 2) {
                            //draw select dot...
            //}

            // draw a checkbox before each item
            // ...
        }
    }

    public void commandAction(Command c, Displayable d) {
        //...
        if(c == selectCmd){
            selectTodelete[selectedItem] = true;
        }
        if(c== unselectCmd){
            selectTodelete[selectedItem] = false;
        }
        if(c == selectAll){
            selectTodelete[0] = selectTodelete[1] = true;
        }
        repaint();
    }
    //...
}


update - answer to question in comments


  我想让国际协力事业团进行核查,这意味着当监听时,我会得到这种检查,而当我删除指挥时,它将删除所有囚室。

为此,你可以发现<条码>选择Todelete,在课外使用,但需使用以下方法:

    boolean isSelected(int elementNum) {
        return elementNum >= 0 && elementNum < selectTodelete.length
                && selectTodelete[elementNum];
    } // modelled after javax.microedition.lcdui.Choice.isSelected

......在你需要时,如在以下方法中,可进一步利用类似信息:

    Vector useSelection(DataList dataList, DataStore[][] ds) {
        Vector result = new Vector();
        int count = ds.length;
        for(int i = 0; i < count; i++ ) {
            if (!dataList.isSelected(i)) {
                continue; // skip non selected
            }
            System.out.println("RCID selected: [" + ds[i][5].cellText + "]");
            result.addElement(ds[i][5]);
        }
        return result;
    }

update - answer to question in comments

友情链接