如何在黑莓中将字符串值从一个屏幕发送到另一个屏幕? [英] How to send String value from one screen to another in Blackberry?

问题描述

任何人都请帮我将字符串值从一个屏幕传递到黑莓中的另一个屏幕

Anyone please help me to pass String value from one screen to another screen in Blackberry

推荐答案

我想说的是从第一个屏幕推送第二个屏幕，而不是从应用程序中推送.
应用内推送第一屏:

I would say to do pushing 2nd screen from the 1st screen, not from the application.
In app push first screen:

public class App extends UiApplication {
    public static void main(String[] args) {
        App app = new App();
        app.enterEventDispatcher();
    }   
    public App() {
        FirstScreen scr = new FirstScreen();
        pushScreen(scr);
    }
}

第二个屏幕有一个字符串值的设置器:

Second screen has a setter for string value:

public class SecondScreen extends MainScreen {

    String mTextValue = null;
    LabelField mLabel = null;

    public void setTextValue(String textValue) {
        mTextValue = textValue;
        mLabel.setText(mTextValue);
    }

    public SecondScreen() {
        super();        
        mLabel = new LabelField();
        add(mLabel);
    }
}

在第一个屏幕中创建第二个，设置字符串值并推送它.如果您不需要返回，则弹出第一个屏幕:

In first screen create second, set string value and push it. Pop first screen if you don't need to return on it:

public class FirstScreen extends MainScreen implements FieldChangeListener {

    BasicEditField mEdit = null; 
    ButtonField mButton = null;

    public FirstScreen() {
        super();                
         mEdit = new BasicEditField("input: ", "some text");
         add(mEdit);
         mButton = new ButtonField("Go second screen");
         mButton.setChangeListener(this);
         add(mButton);
    }
    public void fieldChanged(Field field, int context) {
        if(mButton == field)
        {
            SecondScreen scr = new SecondScreen();
            scr.setTextValue(mEdit.getText());
            UiApplication.getUiApplication().pushScreen(scr);
            UiApplication.getUiApplication().popScreen(this);
        }
    }   
}

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