在Blackberry中将字段值从弹出式屏幕返回到主屏幕

现在我有了一个MyScreen，它从包含一个按钮的主屏幕扩展而来。单击按钮时，将显示弹出式屏幕，其中包含RadioButtonFields、OK和Cancel按钮的列表。我的问题是如何将RadioButtonField值从PopupScreen返回到MyScreen

请帮我解决这个问题

谢谢

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下面是我的代码

MyScreen.java

public class MyScreen extends MainScreen{
    private int currentValue = 0;
    public MyScreen() {
        LabelField lblField = new LabelField();
        lblField.setText("Current Value = " + currentValue);

        ButtonField btnPopup = new ButtonField("Show Popup");
        btnPopup.setChangeListener(new FieldChangeListener() {

            public void fieldChanged(Field field, int context) {
                UiApplication.getUiApplication().pushScreen(new MyPopupScreen());
            }
        });

        add(lblField);
        add(btnPopup);

    }
}

public class MyScreen extends MainScreen implements MyListener {

    MyScreen screen = null;

    public MyScreen() {
        screen = this;

        LabelField lblField = new LabelField();
        lblField.setText("Current Value = " + currentValue);

        ButtonField btnPopup = new ButtonField("Show Popup");
        btnPopup.setChangeListener(new FieldChangeListener() {

            public void fieldChanged(Field field, int context) {
                UiApplication.getUiApplication().pushScreen(new MyPopupScreen(screen));
            }
        });

        add(lblField);
        add(btnPopup);

    }


    public void valueChanged(int selectedIdx) {
        Dialog.alert(selectedIdx );
    }
}

public interface MyListener {
    public void valueChanged(int selectedIdx);
}

public class MyPopupScreen extends PopupScreen implements FieldChangeListener {
    MyScreen deligate = null;


    public MyPopupScreen(final MyScreen deligate) {

        super(new VerticalFieldManager(VerticalFieldManager.VERTICAL_SCROLL|VerticalFieldManager.VERTICAL_SCROLLBAR), Field.FOCUSABLE);
        this.deligate = deligate;
        add(new LabelField("Select Type"));


        ButtonField closeBtn = new ButtonField("Close");
        ButtonField okBtn = new ButtonField("OK");
        add(okBtn);
        add(closeBtn);

        closeBtn.setChangeListener(new FieldChangeListener() {

            public void fieldChanged(Field field, int context) {
                UiApplication.getUiApplication().popScreen(UiApplication.getUiApplication().getActiveScreen());
            }
        });
        okBtn.setChangeListener(new FieldChangeListener() {

            public void fieldChanged(Field field, int context) {
                deligate.valueChanged(radioGroup.getSelectedIndex());
                UiApplication.getUiApplication().popScreen(UiApplication.getUiApplication().getActiveScreen());


            }
        });
    }


}

mypop屏幕上方

public class MyPopupScreen extends PopupScreen implements FieldChangeListener {
    private int currentValue = -1;

    public MyPopupScreen() {
        super(new VerticalFieldManager(VerticalFieldManager.VERTICAL_SCROLL|VerticalFieldManager.VERTICAL_SCROLLBAR), Field.FOCUSABLE 

                );
        add(new LabelField("Select Chart Type"));

        RadioButtonGroup radioGroup = new RadioButtonGroup();
        for (int i = 0; i < 10; i++) {
            RadioButtonField radio = new RadioButtonField("Option no. " + i, radioGroup, false);
            radio.setChangeListener(this);
            add(radio);
        }

        ButtonField cancelBtn = new ButtonField("Close");
        ButtonField okBtn = new ButtonField("OK");
        add(okBtn);
        add(cancelBtn);

        cancelBtn.setChangeListener(new FieldChangeListener() {

            public void fieldChanged(Field field, int context) {
                UiApplication.getUiApplication().popScreen();
            }
        });
        okBtn.setChangeListener(new FieldChangeListener() {

            public void fieldChanged(Field field, int context) {
                //How to get radio value or index value to pass back to MyScreen
            }
        });
    }

    public void fieldChanged(Field field, int context) {
        if (field instanceof RadioButtonField) {
            RadioButtonField radio = (RadioButtonField) field;
            currentValue = radio.getIndex();
        }
    }
}

公共类MyPopupScreen扩展PopupScreen实现FieldChangeListener{
私有int currentValue=-1；
公共MyPopupScreen（）{
超级（新的VerticalFieldManager（VerticalFieldManager.VerticalFieldManager.VerticalFieldManager.VerticalFieldManager.VerticalFieldManager.VerticalScrollbar），Field.FOCUSABLE
);
添加（新LabelField（“选择图表类型”）；
RadioButtonGroup radioGroup=新RadioButtonGroup（）；
对于（int i=0；i<10；i++）{
RadioButtonField radio=新RadioButtonField（“选项号”+i，放射组，假）；
radio.setChangeListener（this）；
添加（收音机）；
}
按钮字段取消BTN=新按钮字段（“关闭”）；
按钮字段okBtn=新按钮字段（“OK”）；
添加（okBtn）；
添加（取消BTN）；
cancelBtn.setChangeListener（新的FieldChangeListener（）{
公共无效字段已更改（字段，int上下文）{
UiApplication.getUiApplication（）.popScreen（）；
}
});
okBtn.setChangeListener（新的FieldChangeListener（）{
公共无效字段已更改（字段，int上下文）{
//如何获取要传回MyScreen的广播值或索引值
}
});
}
公共无效字段已更改（字段，int上下文）{
if（RadioButtonField的字段实例）{
RadioButtonField radio=（RadioButtonField）字段；
currentValue=radio.getIndex（）；
}
}
}

公共类MyScreen扩展了主屏幕{
私有int currentValue=0；
String result；//声明结果
公共MyScreen（）{
LabelField lblField=新的LabelField（）；
lblField.setText（“当前值=“+currentValue”）；
按钮字段btnPopup=新按钮字段（“显示弹出窗口”）；
btnPopup.setChangeListener（新的FieldChangeListener（）{
公共无效字段已更改（字段，int上下文）{
UiApplication.getUiApplication（）.pushScreen（新的MyPopupScreen（））；
}
});
ButtonField btnGetResult=新按钮字段（“结果”）；//添加新按钮
btnGetResult.setChangeListener（新的FieldChangeListener（）{
公共无效字段已更改（字段，int上下文）{
对话。通知（结果）；
}
});
添加（lblField）；
添加（btnPopup）；
add（btnGetResult）；//添加按钮以获取所选索引
}
公共类MyPopupScreen扩展了PopupScreen实现了FieldChangeListener{
私有int currentValue=-1；
无线电现场无线电；
公共MyPopupScreen（）{
超级（新的VerticalFieldManager（VerticalFieldManager.VerticalFieldManager.VerticalFieldManager.VerticalFieldManager.VerticalFieldManager.VerticalScrollbar），Field.FOCUSABLE
);
添加（新LabelField（“选择图表类型”）；
最终RadioButtonGroup radioGroup=新RadioButtonGroup（）；
对于（int i=0；i<10；i++）{
radio=新RadioButton字段（“选项号”+i，放射组，假）；
radio.setChangeListener（this）；
添加（收音机）；
}
按钮字段取消BTN=新按钮字段（“关闭”）；
按钮字段okBtn=新按钮字段（“OK”）；
添加（okBtn）；
添加（取消BTN）；
cancelBtn.setChangeListener（新的FieldChangeListener（）{
公共无效字段已更改（字段，int上下文）{
UiApplication.getUiApplication（）.popScreen（MyPopupScreen.this）；
}
});
okBtn.setChangeListener（新的FieldChangeListener（）{
公共无效字段已更改（字段，int上下文）{
结果=放射组。getSelectedIndex（）+“”；
UiApplication.getUiApplication（）.popScreen（MyPopupScreen.this）；
}
});
}
公共无效字段已更改（字段，int上下文）{
if（RadioButtonField的字段实例）{
RadioButtonField radio=（RadioButtonField）字段；
currentValue=radio.getIndex（）；
}
}
}
}

正如Vijay所说，这是使用内部类实现这一点的一种方法。另一种方法可以是，使用设计观察者设计模式

试着理解下面的代码，并使用任何对您有效的方法

MyScreen.java

public class MyScreen extends MainScreen{
    private int currentValue = 0;
    public MyScreen() {
        LabelField lblField = new LabelField();
        lblField.setText("Current Value = " + currentValue);

        ButtonField btnPopup = new ButtonField("Show Popup");
        btnPopup.setChangeListener(new FieldChangeListener() {

            public void fieldChanged(Field field, int context) {
                UiApplication.getUiApplication().pushScreen(new MyPopupScreen());
            }
        });

        add(lblField);
        add(btnPopup);

    }
}

public class MyScreen extends MainScreen implements MyListener {

    MyScreen screen = null;

    public MyScreen() {
        screen = this;

        LabelField lblField = new LabelField();
        lblField.setText("Current Value = " + currentValue);

        ButtonField btnPopup = new ButtonField("Show Popup");
        btnPopup.setChangeListener(new FieldChangeListener() {

            public void fieldChanged(Field field, int context) {
                UiApplication.getUiApplication().pushScreen(new MyPopupScreen(screen));
            }
        });

        add(lblField);
        add(btnPopup);

    }


    public void valueChanged(int selectedIdx) {
        Dialog.alert(selectedIdx );
    }
}

public interface MyListener {
    public void valueChanged(int selectedIdx);
}

public class MyPopupScreen extends PopupScreen implements FieldChangeListener {
    MyScreen deligate = null;


    public MyPopupScreen(final MyScreen deligate) {

        super(new VerticalFieldManager(VerticalFieldManager.VERTICAL_SCROLL|VerticalFieldManager.VERTICAL_SCROLLBAR), Field.FOCUSABLE);
        this.deligate = deligate;
        add(new LabelField("Select Type"));


        ButtonField closeBtn = new ButtonField("Close");
        ButtonField okBtn = new ButtonField("OK");
        add(okBtn);
        add(closeBtn);

        closeBtn.setChangeListener(new FieldChangeListener() {

            public void fieldChanged(Field field, int context) {
                UiApplication.getUiApplication().popScreen(UiApplication.getUiApplication().getActiveScreen());
            }
        });
        okBtn.setChangeListener(new FieldChangeListener() {

            public void fieldChanged(Field field, int context) {
                deligate.valueChanged(radioGroup.getSelectedIndex());
                UiApplication.getUiApplication().popScreen(UiApplication.getUiApplication().getActiveScreen());


            }
        });
    }


}

MyListener.java

public class MyScreen extends MainScreen{
    private int currentValue = 0;
    public MyScreen() {
        LabelField lblField = new LabelField();
        lblField.setText("Current Value = " + currentValue);

        ButtonField btnPopup = new ButtonField("Show Popup");
        btnPopup.setChangeListener(new FieldChangeListener() {

            public void fieldChanged(Field field, int context) {
                UiApplication.getUiApplication().pushScreen(new MyPopupScreen());
            }
        });

        add(lblField);
        add(btnPopup);

    }
}

public class MyScreen extends MainScreen implements MyListener {

    MyScreen screen = null;

    public MyScreen() {
        screen = this;

        LabelField lblField = new LabelField();
        lblField.setText("Current Value = " + currentValue);

        ButtonField btnPopup = new ButtonField("Show Popup");
        btnPopup.setChangeListener(new FieldChangeListener() {

            public void fieldChanged(Field field, int context) {
                UiApplication.getUiApplication().pushScreen(new MyPopupScreen(screen));
            }
        });

        add(lblField);
        add(btnPopup);

    }


    public void valueChanged(int selectedIdx) {
        Dialog.alert(selectedIdx );
    }
}

public interface MyListener {
    public void valueChanged(int selectedIdx);
}

public class MyPopupScreen extends PopupScreen implements FieldChangeListener {
    MyScreen deligate = null;


    public MyPopupScreen(final MyScreen deligate) {

        super(new VerticalFieldManager(VerticalFieldManager.VERTICAL_SCROLL|VerticalFieldManager.VERTICAL_SCROLLBAR), Field.FOCUSABLE);
        this.deligate = deligate;
        add(new LabelField("Select Type"));


        ButtonField closeBtn = new ButtonField("Close");
        ButtonField okBtn = new ButtonField("OK");
        add(okBtn);
        add(closeBtn);

        closeBtn.setChangeListener(new FieldChangeListener() {

            public void fieldChanged(Field field, int context) {
                UiApplication.getUiApplication().popScreen(UiApplication.getUiApplication().getActiveScreen());
            }
        });
        okBtn.setChangeListener(new FieldChangeListener() {

            public void fieldChanged(Field field, int context) {
                deligate.valueChanged(radioGroup.getSelectedIndex());
                UiApplication.getUiApplication().popScreen(UiApplication.getUiApplication().getActiveScreen());


            }
        });
    }


}

MyPopupScreen.java

public class MyScreen extends MainScreen{
    private int currentValue = 0;
    public MyScreen() {
        LabelField lblField = new LabelField();
        lblField.setText("Current Value = " + currentValue);

        ButtonField btnPopup = new ButtonField("Show Popup");
        btnPopup.setChangeListener(new FieldChangeListener() {

            public void fieldChanged(Field field, int context) {
                UiApplication.getUiApplication().pushScreen(new MyPopupScreen());
            }
        });

        add(lblField);
        add(btnPopup);

    }
}

public class MyScreen extends MainScreen implements MyListener {

    MyScreen screen = null;

    public MyScreen() {
        screen = this;

        LabelField lblField = new LabelField();
        lblField.setText("Current Value = " + currentValue);

        ButtonField btnPopup = new ButtonField("Show Popup");
        btnPopup.setChangeListener(new FieldChangeListener() {

            public void fieldChanged(Field field, int context) {
                UiApplication.getUiApplication().pushScreen(new MyPopupScreen(screen));
            }
        });

        add(lblField);
        add(btnPopup);

    }


    public void valueChanged(int selectedIdx) {
        Dialog.alert(selectedIdx );
    }
}

public interface MyListener {
    public void valueChanged(int selectedIdx);
}

public class MyPopupScreen extends PopupScreen implements FieldChangeListener {
    MyScreen deligate = null;


    public MyPopupScreen(final MyScreen deligate) {

        super(new VerticalFieldManager(VerticalFieldManager.VERTICAL_SCROLL|VerticalFieldManager.VERTICAL_SCROLLBAR), Field.FOCUSABLE);
        this.deligate = deligate;
        add(new LabelField("Select Type"));


        ButtonField closeBtn = new ButtonField("Close");
        ButtonField okBtn = new ButtonField("OK");
        add(okBtn);
        add(closeBtn);

        closeBtn.setChangeListener(new FieldChangeListener() {

            public void fieldChanged(Field field, int context) {
                UiApplication.getUiApplication().popScreen(UiApplication.getUiApplication().getActiveScreen());
            }
        });
        okBtn.setChangeListener(new FieldChangeListener() {

            public void fieldChanged(Field field, int context) {
                deligate.valueChanged(radioGroup.getSelectedIndex());
                UiApplication.getUiApplication().popScreen(UiApplication.getUiApplication().getActiveScreen());


            }
        });
    }


}

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把你的密码放进去。我刚刚更新了我的密码来回答我的问题。请帮帮我，谢谢你的帮助reply@OneCart.. 用另一种方法找到答案。我已经在那一行添加了修改和评论。输入此代码，您将获得所选索引。这很好，谢谢@vijay.jangid07，谢谢您的帮助。但是如果我不使用内部类的话（在我的情况下）会更好谢谢Neel。这样，我的问题就解决了，代码也更清晰了