自定义水平字段管理器Blackberry的内容

时间：2012-08-17 05:56:33

标签： blackberry java-me

我正在开发一个应用程序，我需要在可扩展列表中显示产品。所以我尝试了一个在stackoverflow中给出的例子......所以，它运行良好，但我的问题是不会根据内容扩展进行包装（扩展）的分隔符，就像在屏幕中...

enter image description here

如您所见，在屏幕中 date2 字段未正确显示.. 为此，是否有任何滚动设施或可以自动扩展？

这是我的代码 

import net.rim.device.api.system.Bitmap;
import net.rim.device.api.system.Display;
import net.rim.device.api.ui.Color;
import net.rim.device.api.ui.DrawStyle;
import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.FieldChangeListener;
import net.rim.device.api.ui.Font;
import net.rim.device.api.ui.FontFamily;
import net.rim.device.api.ui.Graphics;
import net.rim.device.api.ui.TouchEvent;
import net.rim.device.api.ui.Touchscreen;
import net.rim.device.api.ui.UiApplication;
import net.rim.device.api.ui.component.BitmapField;
import net.rim.device.api.ui.component.ButtonField;
import net.rim.device.api.ui.component.Dialog;
import net.rim.device.api.ui.component.LabelField;
import net.rim.device.api.ui.component.NullField;
import net.rim.device.api.ui.component.SeparatorField;
import net.rim.device.api.ui.container.HorizontalFieldManager;
import net.rim.device.api.ui.container.MainScreen;
import net.rim.device.api.ui.container.VerticalFieldManager;

class UiMainscreen extends MainScreen implements FieldChangeListener
{
    private CustomListField cu_field[];
    private Bitmap image=null;
    int size=8;
    public UiMainscreen() {
        VerticalFieldManager vmanager=new VerticalFieldManager(VERTICAL_SCROLL|VERTICAL_SCROLLBAR){
            protected void sublayout(int maxWidth, int maxHeight) {

                super.sublayout(Display.getWidth(),Display.getHeight());
                setExtent(Display.getWidth(),Display.getHeight());
            }
        };
        cu_field=new CustomListField[size]; 
        for(int i=0;i<size;i++){
            image=Bitmap.getBitmapResource("sample_"+i+".jpg");
            cu_field[i]=new CustomListField("BlackBerry models that had a built-in mobile phone, were the first models that natively ran Java, and transmitted data over the normal 2G cellular network. RIM began to advertise these devices as email-capable mobile phones rather than as 2-way pagers.", image, "jan2011", 100, 100,Color.LIGHTGREEN);
            cu_field[i].setChangeListener(this);
            vmanager.add(new SeparatorField());
            vmanager.add(cu_field[i]);
        }
        add(vmanager);
    }

    public void fieldChanged(Field field, int context) {
        // TODO Auto-generated method stub
        for(int i=0;i<size;i++){
            if(field==cu_field[i]){
                final int k=i;
                UiApplication.getUiApplication().invokeLater(new Runnable() {
                    public void run() {
                        Dialog.alert("You click on Item No "+k);
                    }
                });
            }
        }
    }
}

class CustomListField extends HorizontalFieldManager{

    private Bitmap scale_image;
    private int width=0;
    private int height=0;
    private int background_color=0;
    private BitmapField bitmap_field;
    private boolean flag=false;
    Bitmap logingBg;
    public CustomListField(String title, Bitmap image, String date,int image_width,int image_height,int background_color){
        super(NO_HORIZONTAL_SCROLL|USE_ALL_WIDTH);
        this.background_color=background_color;
        width=image_width;
        height=image_width;
        if(image!=null){
            scale_image=new Bitmap(image_width, image_height);
            image.scaleInto(scale_image, Bitmap.FILTER_LANCZOS);
            bitmap_field=new BitmapField(scale_image);
            flag=false;
            bitmap_field.setMargin(5, 5, 5, 5);
            add(bitmap_field);
        }


        VerticalFieldManager vmanager=new VerticalFieldManager(USE_ALL_WIDTH|Field.FIELD_VCENTER){
            protected void sublayout(int maxWidth, int maxHeight) {
                super.sublayout(Display.getWidth(), height);
                setExtent(Display.getWidth(), height);
            }
        };
        ///////////////////////////////////////////
       /* Bitmap logingBg = Bitmap.getBitmapResource("myorderdatebackground.png");
        HorizontalFieldManager hfm = new HorizontalFieldManager(USE_ALL_WIDTH);
        HorizontalFieldManager hfm2 = new HorizontalFieldManager(Field.FIELD_HCENTER);
        ButtonField btnext = new ButtonField("btn");
        CustomButtonField btnSignIn = new CustomButtonField(0, "", logingBg,
                logingBg, Field.FOCUSABLE, Color.WHITE);
        hfm2.add(btnext);
        hfm.add(btnSignIn);

        hfm.add(hfm2);
        vmanager.add(hfm);*/
         logingBg = Bitmap.getBitmapResource("myorderdatebackground.png");

        HorizontalFieldManager HFM = new HorizontalFieldManager(USE_ALL_WIDTH) {
            public void paint(Graphics g) {
                //g.setBackgroundColor(Color.BLUE);
                g.clear();
                g.drawBitmap(0, 0, Display.getWidth(),            
                        logingBg.getHeight(), logingBg, 0, 0);  
                super.paint(g);
            }
        };


        HorizontalFieldManager lableRegistHFM = new HorizontalFieldManager(
                FIELD_VCENTER);
        LabelField RegistrationLbl = new LabelField("My Orders",Field.FIELD_HCENTER);
        FontFamily fontFamily[] = FontFamily.getFontFamilies();
        Font font11 = fontFamily[1].getFont(FontFamily.CBTF_FONT, 12);
        font11 = fontFamily[1].getFont(Font.BOLD, 18);
        RegistrationLbl.setFont(font11);
        RegistrationLbl.setMargin(0, 0, 0, (Display.getWidth() / 3));

        lableRegistHFM.add(RegistrationLbl);

        HFM.add(lableRegistHFM);
        vmanager.add(HFM);

        /**************************************************************/

        LabelField title_lbl=new LabelField("Title: "+title,Field.NON_FOCUSABLE|DrawStyle.ELLIPSIS);
        vmanager.add(title_lbl);

        LabelField date_lbl=new LabelField("Date: "+date,Field.NON_FOCUSABLE);
        vmanager.add(date_lbl);

        LabelField date_lbl3=new LabelField("Date2: "+date,Field.NON_FOCUSABLE);
        vmanager.add(date_lbl3);

        LabelField date_lbl4=new LabelField("Date2: "+date,Field.NON_FOCUSABLE);
        vmanager.add(date_lbl4);

        Font fon=title_lbl.getFont();
        int title_height=fon.getHeight();

        Font font=date_lbl.getFont();
        int date_height=font.getHeight();
        int pad=title_height+date_height;
        title_lbl.setPadding((height-pad)/2, 0, 0, 0);
        add(vmanager);
        add(new NullField(FOCUSABLE));
    }

    protected void sublayout(int maxWidth, int maxHeight) {
        super.sublayout(Display.getWidth(), height);
        setExtent(Display.getWidth(), height);
    }
    protected void paint(Graphics graphics) {
        if(flag)
        graphics.setBackgroundColor(background_color);
        graphics.clear();
        super.paint(graphics);
    }
    protected void onFocus(int direction) {
        super.onFocus(direction);
        flag=true;
        invalidate();
    }
    protected void onUnfocus() {
        invalidate();
        flag=false;
    }
    protected boolean navigationClick(int status, int time) {

        if(Touchscreen.isSupported()){
            return false;
        }else{
            fieldChangeNotify(1);
            return true;
        }

    }
    protected boolean touchEvent(TouchEvent message) 
    {
        if (TouchEvent.CLICK == message.getEvent()) 
        {

            FieldChangeListener listener = getChangeListener();
            if (null != listener)
                this.setFocus();
                listener.fieldChanged(this, 1);
        }
        return super.touchEvent(message);
    }
}

1 个答案:

答案 0 :(得分：2)

问题在于：

protected void sublayout(int maxWidth, int maxHeight) {
    super.sublayout(Display.getWidth(), height);
    setExtent(Display.getWidth(), height);
}

您的经理身高低于内容所需（仅image_width）。

此处可能还有错误：

width=image_width;
height=image_width;

您应该image_height使用height。

确定您可以使用滚动VerticalManager - 向构造函数添加样式VERTICAL_SCROLL。但是作为用户，我会发现用户体验（UX）在这种情况下很奇怪。

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