如何从一个屏幕发送字符串值到另一个黑莓？ [英] How to send String value from one screen to another in Blackberry?

问题描述

请人帮我从一个屏幕传递字符串值在黑莓另一个屏幕

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

推荐答案

我会说这样做从第一屏推第二屏幕，而不是从应用程序。

在应用程序推第一个画面：

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);
    }
}

二屏幕上显示的字符串值的setter：

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);
    }
}

在第一个屏幕上创建第二个，设置字符串值，并将其推入。弹出第一个屏幕，如果你不需要它返回：

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);
    	}
    }	
}

这篇关于如何从一个屏幕发送字符串值到另一个黑莓？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！