memoryform.java

来自「< JAVA ME 手机应用开发技术月案例详解>>一书中的一个」· Java 代码 · 共 28 行

package com.wy.ch17;

import javax.microedition.lcdui.*;

public class MemoryForm extends Form implements BackDisplay {
    private Displayable backDisplay; //记录回退时应该显示的对象
    public MemoryForm(String title, Displayable backDisplay) {
        super(title);
        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);
    }
}