Question

我正在一个应用程序中工作，我必须在列表视图中显示联系人。我已经在Vertical Field Manager和Label Fields的帮助下创建了列表视图。

我有一个电子邮件字段和电话号码字段，我必须在其上调用点击监听器。

我已经在我的类上实现了监听器，但是对于click事件失败了。不要显示任何点击事件。

目前，我正在使用以下代码：

public class CustomListView extends VerticalFieldManager implements FieldChangeListener{
    private VerticalFieldManager mVFM=null;

    private Font _allFonts=null;
    private Font _headingFonts=null;

    /**
     * @param resultVec
     */
    public CustomListView() {
        super(VerticalFieldManager.VERTICAL_SCROLL);
        setMargin(0, 0, 10, 0);

        int resolutionWidth = Display.getWidth(); // PLANNING FOR THREE FIXED RESOLUTIONS 320, 360 AND 480
        //HANDLE WITH THE CODE DIFFERENT DEVICES
        if(resolutionWidth>=480){
            _allFonts = ApplicationFont.explainationFont_18;
            _headingFonts = ApplicationFont.labelFont_18;
        }else if(resolutionWidth >=360){
            _allFonts = ApplicationFont.explainationFont_18;
            _headingFonts = ApplicationFont.labelFont_18;
        }else{//RESOLUTION WIDTH <=320
            _allFonts = ApplicationFont.explainationFont_15;
            _headingFonts = ApplicationFont.labelFont_15;
        }

        int maxLength = Constants.Country_List.length;
        int minLength = 0;
        if(maxLength >= 0){
            for (int i = minLength; i < maxLength; i++) {
                VerticalFieldManager vfm = getVerticalFieldManager();
                vfm.setMargin(0, 10, 0, 10);

                LabelField countryLabel = new LabelField();
                countryLabel.setText(Constants.Country_List[i]);
                //countryLabel.setFont(_allFonts);
                countryLabel.setMargin(10, 0, 10, 0);
                HorizontalFieldManager countryHFM = new HorizontalFieldManager(Manager.USE_ALL_WIDTH);
                countryHFM.add(countryLabel);
                countryHFM.setBackground(BackgroundFactory
                        .createSolidBackground(Constants.LightGreyBgColorCode));

                LabelField addressLabel = new LabelField();
                addressLabel.setText(Constants.Address_List[i]);
                //addressLabel.setFont(_allFonts);

                LabelField stateLabel = new LabelField();
                stateLabel.setText(Constants.State_List[i]);
                //  stateLabel.setFont(_allFonts);

                LabelField cityLabel = new LabelField(){
                    protected void paint(Graphics graphics) {
                        graphics.setColor(Constants.DarkGreyTextColorCode);
                        super.paint(graphics);
                    }
                };
                cityLabel.setText(Constants.City_List[i]);
                //cityLabel.setFont(_allFonts);

                LabelField phoneLabel = new LabelField(){
                    protected void paint(Graphics graphics) {
                        graphics.setColor(Constants.DarkGreyTextColorCode);
                        super.paint(graphics);
                    }
                };
                phoneLabel.setText("Phone(s):");
                //phoneLabel.setFont(_allFonts);

                LabelField numLabel = new LabelField(){
                    protected void paint(Graphics graphics) {
                        graphics.setColor(Constants.blueTextColor);
                        super.paint(graphics);
                    }
                };
                numLabel.setText(Constants.Phone_List[i]);
                //numLabel.setFont(_allFonts);

                HorizontalFieldManager phoneNumberHFM = new HorizontalFieldManager();
                phoneNumberHFM.add(phoneLabel);
                phoneNumberHFM.add(numLabel);

                LabelField emailLabel = new LabelField(){
                    protected void paint(Graphics graphics) {
                        graphics.setColor(Constants.DarkGreyTextColorCode);
                        super.paint(graphics);
                    }
                };
                emailLabel.setText("Email:");
                //emailLabel.setFont(_allFonts);

                LabelField emailIdLabel = new LabelField(){
                    protected void paint(Graphics graphics) {
                        graphics.setColor(Constants.blueTextColor);
                        super.paint(graphics);
                    }
                };
                emailIdLabel.setText(Constants.Email_List[i]);
                //emailIdLabel.setFont(_allFonts);

                HorizontalFieldManager emailIdHFM = new HorizontalFieldManager();
                emailIdHFM.add(emailLabel);
                emailIdHFM.add(emailIdLabel);


                mVFM = new  VerticalFieldManager(USE_ALL_WIDTH /*|FOCUSABLE*/);
                mVFM.setMargin(20, 0, 20, 0);
                mVFM.add(countryHFM);
                mVFM.add(addressLabel);
                mVFM.add(stateLabel);
                mVFM.add(cityLabel);
                mVFM.add(phoneNumberHFM);
                mVFM.add(emailIdHFM);
                mVFM.add(new NullField(FOCUSABLE));

                vfm.add(mVFM);
                /*SeparatorField separater = new SeparatorField(Constants.LightGreyBgColorCode);
                separater.setMargin(0, 10, 0, 10);*/
                vfm.add(new SeparatorField(Constants.LightGreyBgColorCode));
                add(vfm);
            }
        }
    }

    private VerticalFieldManager getVerticalFieldManager() {
        VerticalFieldManager verticalFieldManager = new VerticalFieldManager(
                VerticalFieldManager.FOCUSABLE
                | VerticalFieldManager.FIELD_HCENTER
                | VerticalFieldManager.VERTICAL_SCROLL
                | VerticalFieldManager.USE_ALL_WIDTH) {

            protected boolean touchEvent(TouchEvent message) {
                if (message.getEvent() == TouchEvent.CLICK) {
                    navigationClick(0, 0);
                }
                return super.touchEvent(message);
            }

            public boolean navigationClick(int status, int time) {
                fieldChangeNotify(1);
                return true;
            }

            protected void onFocus(int direction) {
                super.onFocus(direction);
                setBackground(BackgroundFactory
                        .createSolidBackground(/*0x186DEF*/Constants.WhiteBgColorCode));
                invalidate();
            }

            protected void onUnfocus() {
                super.onUnfocus();
                setBackground(BackgroundFactory
                        .createSolidBackground(Constants.WhiteBgColorCode));
                invalidate();
            }
        };      
        return verticalFieldManager;
    }

    public void fieldChanged(Field field, int context) {
    }
}

请建议，如何为列表视图构建一个点击监听器。

Answer 1

我认为你还没有完全理解FieldChangeListener需要什么。

这是一个使用FieldChangeListener的简单实现（请注意，这只适用于OS 5.0及更高版本，因为之前ZoomScreen不可用。）

public MyScreen() {        
    // Set the displayed title of the screen       
    setTitle("Test ZoomScreen");
    ButtonField zoomButton = new ButtonField("Zoom Screen Test");
    FieldChangeListener listener=new FieldChangeListener() {
        public void fieldChanged(Field field, int context) {
            EncodedImage ei = EncodedImage.getEncodedImageResource("Koala.jpg");
            UiApplication.getUiApplication().pushScreen(new ZoomScreen(ei));
        }
    };
    zoomButton.setChangeListener(listener);
    add(zoomButton);
}

重要的步骤是：

创建您正在侦听更改的字段 - 在这种情况下， zoomButton。
创建FieldChangeListener - 在本例中是一个单独的类只是听，请注意听力是在 fieldChanged（）方法。
将FieldChangeListener连接到它正在侦听的字段 - 在这种情况下，我们在zoomButton上执行setChangeListener。

我认为如果您查看此实现，您会发现您错过了一些步骤，特别是您似乎已经完成了（1），但没有（2）或（3）。而不是我纠正你的代码，我建议你使用我希望上面给你的洞察力，并纠正你自己的代码。祝你好运。

Blackberry中自定义ListView的字段更改侦听器？

1 个答案: