propertyform.java

J2ME程序设计实例教程的源码

import javax.microedition.lcdui.*;
import java.util.Date;
import java.util.Calendar;

public class PropertyForm extends Form implements CommandListener {
    private FileManagerMIDlet midlet;
    private StringItem siName;
    private StringItem siReadable;
    private StringItem siWriteable;
    private StringItem siHidden;
    private StringItem siModifyDate;
    
    private Displayable backScreen;
    
    private Command cmdBack = new Command("返回", Command.BACK, 1);
    
    public PropertyForm(FileManagerMIDlet midlet) {
        super("属性");
        this.midlet = midlet;
        siName = new StringItem("文件名：", "");
        siReadable = new StringItem("可读：", "");
        siWriteable = new StringItem("可写：", "");
        siHidden = new StringItem("隐藏：", "");
        siModifyDate = new StringItem("最后修改时间：", "");
        append(siName);
        append(siReadable);
        append(siWriteable);
        append(siHidden);
        append(siModifyDate);
        
        addCommand(cmdBack);
        setCommandListener(this);
    }
    
    public void update(File f, Displayable backScreen) {
        this.backScreen = backScreen;
        siName.setText(f.getName());
        
        if(f.canRead()) {
            siReadable.setText("是");
        }
        else {
            siReadable.setText("否");
        }
        
        if(f.canWrite()) {
            siWriteable.setText("是");
        }
        else {
            siWriteable.setText("否");
        }
        
        if(f.isHidden()) {
            siHidden.setText("是");
        }
        else {
            siHidden.setText("否");
        }
        
        long d = f.getLastModify();
        Calendar cale = Calendar.getInstance();
        cale.setTime(new Date(d));
        String t = cale.get(Calendar.YEAR) + "年" 
                    + (cale.get(Calendar.MONTH) + 1) + "月" 
                    + cale.get(Calendar.DAY_OF_MONTH) + "日"
                    + cale.get(Calendar.HOUR_OF_DAY) + "时"
                    + cale.get(Calendar.MINUTE) + "分";
        siModifyDate.setText(t);
    }
    
    public void commandAction(Command cmd, Displayable d) {
        if(cmd == cmdBack) {
            Display display = Display.getDisplay(midlet);
            display.setCurrent(backScreen);
        }
    }
}