1

クラスではCalendarCanvas、カレンダーの任意の日に押すと、ユーザーが選択した実際の日付(現在の日付だけでなく)がフォームに表示され、フォームの下に関連する画像が表示されます。フォームに(例:6月21日(image.jpg))。

私は2つの問題を抱えています。

第一に、プログラムは。である1つの画像のみが好きですMen.img。その画像が3つの形式すべてで表示されます。他の2つの画像はまったく表示されません。

images.jpgそして、私は最初に1つのフォームから始めて、画像とその画像が機能したので、わかりません。私がしたのは、2つの新しいフォームを作成し、画像の順序を切り替えることだけでした。

サイズ(幅/高さ、KB)を合わせて縮小しましMen.jpgたが、それでも表示されません。ImageItemコンストラクター内の文字列も表示されません。

最後に、メソッドの新しいインスタンスを作成してcalendar.getSelectedDate().toString()、新しいユーザーが選択した日付を表示し、ユーザーが別の日を選択したときにそれを画像の上に配置できるようにするにはどうすればよいですか?

このkeyPressed方法では、コメントアウトされたAlertの新しいインスタンスがそれを行いますが、アラートは必要ありません。ユーザーが選択した日に関連するフォームのタイトルにします。

以下は私のコードです:

クラスCalendarMidlet:

import java.io.IOException;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

/**
 * @author addylesson
 */
public class CalendarMidlet extends MIDlet {
    private Display mydisplay;
    private Command f;
    private Displayable d;

    public CalendarMidlet(){}

    public void startApp() {
        d = new CalendarCanvas(this);

        f = new Command("Exit", Command.EXIT, 0);
        d.addCommand(f);
        d.setCommandListener(new CommandListener()
        {
            public void commandAction(Command c, Displayable s)
            {

                if(c == f)

            notifyDestroyed();
            }
        } );

        mydisplay = Display.getDisplay(this);
        mydisplay.setCurrent(d);

    }




    public void startOver() {

        final Displayable d = new CalendarCanvas(this);

        d.addCommand(f);

        d.setCommandListener(new CommandListener()
        {
            public void commandAction(Command c, Displayable s)
            {

                if(c == f)

            notifyDestroyed();
            }
        } );
        mydisplay.setCurrent(d);
    }

    public void pauseApp() {
    }

    public void destroyApp(boolean unconditional) {
    }

}

クラスCalendarCanvas:

import java.io.IOException;
import java.util.Date;

import javax.microedition.lcdui.*;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

public class CalendarCanvas extends Canvas
{
    CalendarWidget calendar = null;
    CalendarMidlet midlet = null;
        private Alert alert;
        private List mList;
        private Command f,e,n;
        private Display mydisplay;
        private Form form;
        private Form form2;
        private Form form3;
        private ImageItem imageItem;
        private ImageItem imageItem2;
        private ImageItem imageItem3;



    public CalendarCanvas(final CalendarMidlet m)
    {
        String day = calendar.getSelectedDate().toString();

                this.midlet = m;

        calendar = new CalendarWidget(new Date());

        calendar.headerFont = Font.getFont(Font.FACE_PROPORTIONAL, Font.STYLE_BOLD, Font.SIZE_LARGE);
        calendar.weekdayFont = Font.getFont(Font.FACE_PROPORTIONAL, Font.STYLE_BOLD, Font.SIZE_MEDIUM);
        calendar.weekdayBgColor = 0xccccff;
        calendar.weekdayColor = 0x0000ff;
        calendar.headerColor = 0xffffff;

                form = new Form(day);
                form2 = new Form("New Page");
                form3 = new Form("New Page");

                try 
                {
                    imageItem = new ImageItem(
                        "Men In Black 3: ",
                        Image.createImage("Men.jpg"),
                        ImageItem.LAYOUT_DEFAULT,
                        "DuKe");
                    form.append(imageItem);
                } catch(Exception s) {}

                try 
                {
                    imageItem2 = new ImageItem(
                        "Jordon vs Knicks: ",
                        Image.createImage("images.jpg"),
                        ImageItem.LAYOUT_DEFAULT,
                        "Not");
                    form2.append(imageItem2);
                } catch(Exception s) {}
                try 
                {
                    imageItem3 = new ImageItem(
                        "Horoscope: ",
                        Image.createImage("Men.jpg"),
                        ImageItem.LAYOUT_DEFAULT,
                        "DuKe");
                    form3.append(imageItem3);
                } catch(Exception s) {}

                alert = new Alert("Listen", "On this day "
                        +calendar.getSelectedDate().toString()+ "stuff happened", null, null);
                alert.setTimeout(Alert.FOREVER);


                n = new Command("Next", Command.SCREEN,0);
                f = new Command("Back", Command.BACK, 0);
                e = new Command("Exit", Command.EXIT, 1);
                form.addCommand(f);             
                form.addCommand(n);
                form2.addCommand(f);
                form2.addCommand(n);
                form3.addCommand(f);
                form3.addCommand(e);



                form.setCommandListener(new CommandListener()
                      {
                      public void commandAction(Command c, Displayable s)
                        {
                            if (c == f)

                            m.startOver();

                            if (c == e)
                                 m.notifyDestroyed();

                            if (c == n)
                                 Display.getDisplay(midlet).setCurrent(form2);
                        }
                      } );
                form2.setCommandListener(new CommandListener()
                      {
                      public void commandAction(Command c, Displayable s)
                        {
                            if (c == f)

                            m.startOver();

                            if (c == e)
                                 m.notifyDestroyed();

                            if (c == n)
                                 Display.getDisplay(midlet).setCurrent(form3);
                        }
                      } );
                form3.setCommandListener(new CommandListener()
                      {
                      public void commandAction(Command c, Displayable s)
                        {
                            if (c == f)

                            m.startOver();

                            if (c == e)
                                m.notifyDestroyed();
                        }
                      } );


        calendar.initialize();
    }


    protected void keyPressed(int key)
    {
        int keyCode = getGameAction(key);
        String day = calendar.getSelectedDate().toString();
        if(keyCode == FIRE)
        {
             /*Display.getDisplay(midlet).setCurrent(
                new Alert("Selected date", 
                                day, null, 
                                AlertType.CONFIRMATION)
            );*/
                       Display.getDisplay(midlet).setCurrent(form);
        }
        else
        {
            calendar.keyPressed(keyCode);

            repaint();
        }
    }

    protected void paint(Graphics g)
    {
        g.setColor(0xff0000);
        g.fillRect(0, 0, getWidth(), getHeight());

        calendar.paint(g);
    }

}

クラスCalendarWidget:

import java.util.Calendar;
import java.util.Date;

import javax.microedition.lcdui.*;

public class CalendarWidget
{
    static final String[] MONTH_LABELS = new String[]{
        "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"
    };
    static final String[] WEEKDAY_LABELS = new String[]{
        "M", "T", "W", "T", "F", "S", "S"
    };
    /* starting week day: 0 for monday, 6 for sunday */
    public int startWeekday = 0;

    /* elements padding */
    public int padding = 2;

    /* cells border properties */
    public int borderWidth = 4;
    public int borderColor = 0x000000;

    /* weekday labels properties */
    public Font weekdayFont = Font.getDefaultFont();
    public int weekdayBgColor = 0xcccccc;
    public int weekdayColor = 0xffffff;

    /* header (month-year label) properties */
    public Font headerFont = Font.getDefaultFont();
    public int headerBgColor = 0xff0000;
    public int headerColor = 0xff0000;

    /* cells properties */
    public Font font = Font.getDefaultFont();
    public int foreColor = 0xffffff;
    public int bgColor = 0xcccccc;
    public int selectedBgColor = 0x000000;
    public int selectedForeColor = 0xff0000;

    /* internal properties */
    int width = 0;
    int height = 0;
    int headerHeight = 0;
    int weekHeight = 0;
    int cellWidth = 0;
    int cellHeight = 0;

    /* internal time properties */
    long currentTimestamp = 0;
    Calendar calendar = null;
    int weeks = 0;

public CalendarWidget(Date date)
{
    calendar = Calendar.getInstance();

    //we'll see these 2 methods later
    setDate(date);

    initialize();
}
public Date getSelectedDate()
{
    return calendar.getTime();
}
public void setDate(Date d)
{
    currentTimestamp = d.getTime();

    calendar.setTime(d);

    //weeks number can change, depending on week starting day and month total days
    this.weeks = (int)Math.ceil(((double)getStartWeekday() + getMonthDays()) / 7);
}
public void setDate(long timestamp)
{
    setDate(new Date(timestamp));
}
void initialize()
{
    //let's initialize calendar size
    this.cellWidth = font.stringWidth("MM") + 3 * padding;
    this.cellHeight = font.getHeight() + 15 * padding;

    this.headerHeight = headerFont.getHeight() + 2 * padding;
    this.weekHeight = weekdayFont.getHeight() + 2 * padding;

    this.width = 7 * (cellWidth + borderWidth) + borderWidth;
    initHeight();
}
void initHeight()
{
    this.height = 
        headerHeight + weekHeight + 
        this.weeks * (cellHeight + borderWidth) + borderWidth;
}
int getMonthDays()
{
    int month = calendar.get(Calendar.MONTH);

    switch(month)
    {
    case 3:
    case 5:
    case 8:
    case 10:
        return 30;
    case 1:
        return calendar.get(Calendar.YEAR) % 4 == 0 && calendar.get(Calendar.YEAR) % 100 != 0 ? 29 : 28;
    default:
        return 31;
    }
}
int getStartWeekday()
{
    //let's create a new calendar with same month and year, but with day 1
    Calendar c = Calendar.getInstance();

    c.set(Calendar.MONTH, calendar.get(Calendar.MONTH));
    c.set(Calendar.YEAR, calendar.get(Calendar.YEAR));
    c.set(Calendar.DAY_OF_MONTH, 1);

    //we must normalize DAY_OF_WEEK returned value
    return (c.get(Calendar.DAY_OF_WEEK) + 5) % 7;
}
public void keyPressed(int key)
{
    switch(key)
    {
    case Canvas.UP:
        go(-7);
        break;
    case Canvas.DOWN:
        go(7);
        break;
    case Canvas.RIGHT:
        go(1);
        break;
    case Canvas.LEFT:
        go(-1);
        break;
    }
}
void go(int delta)
{
    int prevMonth = calendar.get(Calendar.MONTH);

    setDate(currentTimestamp + 86400000 * delta);

    //we have to check if month has changed
    //if yes, we have to recalculate month height
    //since weeks number could be changed
    if(calendar.get(Calendar.MONTH) != prevMonth)
    {
        initHeight();
    }
}
public void paint(Graphics g)
{
    //painting background
    g.setColor(bgColor);
    g.fillRect(0, 0, width, height);

    //painting header (month-year label)
    g.setFont(headerFont);
    g.setColor(headerColor);
    g.drawString(MONTH_LABELS[calendar.get(Calendar.MONTH)] + " " + calendar.get(Calendar.YEAR), width / 2, padding, Graphics.TOP | Graphics.HCENTER);

    //painting week days labels
    g.translate(0, headerHeight);

    g.setColor(weekdayBgColor);
    g.fillRect(0, 0, width, weekHeight);

    g.setColor(weekdayColor);
    g.setFont(weekdayFont);

    for(int i = 0; i < 7; i++)
    {
        g.drawString(WEEKDAY_LABELS[(i + startWeekday) % 7],
            borderWidth + i * (cellWidth + borderWidth) + cellWidth / 2,
            padding,
            Graphics.TOP | Graphics.HCENTER
        );
    }


    g.translate(0, weekHeight);

    g.setColor(borderColor);

    for(int i = 0; i <= weeks; i++)
    {
        g.fillRect(0, i * (cellHeight + borderWidth), width, borderWidth);
    }
    for(int i = 0; i <= 7; i++)
    {
        g.fillRect(i * (cellWidth + borderWidth), 0, borderWidth, height - headerHeight - weekHeight);
    }


    int days = getMonthDays();
    int dayIndex = (getStartWeekday() - this.startWeekday + 7) % 7;

    g.setColor(foreColor);

    int currentDay = calendar.get(Calendar.DAY_OF_MONTH);

    for(int i = 0; i < days; i++)
    {
        int weekday = (dayIndex + i) % 7;
        int row = (dayIndex + i) / 7;

        int x = borderWidth + weekday * (cellWidth + borderWidth) + cellWidth / 2;
        int y = borderWidth + row * (cellHeight + borderWidth) + padding;


        if(i + 1 == currentDay)
        {
            g.setColor(selectedBgColor);
            g.fillRect(
                borderWidth + weekday * (cellWidth + borderWidth), 
                borderWidth + row * (cellHeight + borderWidth), 
                cellWidth, cellHeight);
            g.setColor(selectedForeColor);
        }

        g.drawString("" + (i + 1), x, y, Graphics.TOP | Graphics.HCENTER);


        if(i + 1 == currentDay)
        {
            g.setColor(foreColor);
        }
    }

    g.translate(0, - headerHeight - weekHeight);
}
}
4

1 に答える 1

1

投稿したコードスニペットに明らかな間違いはありません。

MIDletがそのように複雑になったときに何がうまくいかない可能性があるかを簡単に見つけるには、ログステートメントを追加し、エミュレーター監視コンソールの出力で実行します。

あなたは間違いなくcatchブロック内にロギングを追加する必要があります。私がこのような強力な発言をしている理由を知るには、WebでJava飲み込み例外のようなものを検索してください。

ロギングをお勧めするその他のポイントは、をcommandAction呼び出すときsetCurrentです。開発するときは、必要に応じて自由に追加してください(keyPressedそのための良い候補のようにも見えます)。

public class Log {
    // utility class to keep logging code in one place
    public static void log (String message) {
        System.out.println(message);
        // when debugging at real device, S.o.p above can be refactored
        //  - based on ideas like one used here (with Form.append):
        //    http://stackoverflow.com/questions/10649974
        //  - Another option would be to write log to RMS
        //    and use dedicated MIDlet to read it from there
        //  - If MIDlet has network connection, an option is
        //    to pass log messages over the network. Etc etc...
    }
}


// ... other classes...
    // ...
    catch (Exception e) {
        Log.log("unexpected exception: [" + e + "]");
    }

    // ...
    public void commandAction(Command c, Displayable s) {
        Log.log("command: [" + c.getCommandLabel()
                + "] at screen: [" + d.getTitle() + "]");
        // ...
    }

    // ...
    Log.log("set current: [" + someDisplayable.getTitle() + "]");
    mydisplay.setCurrent(someDisplayable);
    // ...

    protected void keyPressed(int key) {
        Log.log("key pressed: [" + getKeyName(key) + "]");
        // ...
    }
于 2012-05-18T05:59:16.477 に答える