memorylist.java

来自「手机版的旅游信息系统」· Java 代码 · 共 28 行

package com.wy.ch16;

import javax.microedition.lcdui.*;

public class MemoryList extends List implements BackDisplay {
    private Displayable backDisplay; //记录回退时应该显示的对象
    public MemoryList(String title, Displayable backDisplay) {
        super(title, Choice.IMPLICIT);
        this.backDisplay = backDisplay;
    }

    public void setDisplayable(Displayable back) {
        backDisplay = back;
    }

    public Displayable getDisplayable() {
        return backDisplay;
    }

    public void errorMessage(String message) {
        Alert a = new Alert("错误");
        a.setType(AlertType.WARNING);
        a.setString(message);
        a.setTimeout(Alert.FOREVER);
        Display.getDisplay(MainMIDlet.getInstance()).setCurrent(a);
    }
}