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저는 BlackBerry 7 개발 시작과 함께 실제로 작거나 존재하지 않는 oop/java 기술을 테스트 환경에 적용하여 책의 코드에서 loginhandler 선언되지 않았습니다. 그렇습니다. 올바른 것입니다. 선언되지 않았지만 책에서도 선언되지 않았습니다.변수를 확인할 수 없습니다.
여기 - 발췌에서 http://my.safaribooksonline.com/book/-/9781430230151/chapter-4-user-interface-basics/67을 볼 수있다 (내 코드의 맨 아래에) 내부 클래스라는 logincommandhandler입니다 완료되었습니다 무엇 -이 자사의 호출 (내가 생각)하지만 내 제한 OOP 기술 될 운명 것입니다 나는 loginHandler가 어떤 타입으로 정의되어야 하는지를 모른다.
는
package com.beginningblackberry.uifun;
import net.rim.device.api.system.Bitmap;
import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.UiApplication;
import net.rim.device.api.ui.component.BitmapField;
import net.rim.device.api.ui.container.MainScreen;
import net.rim.device.api.ui.container.HorizontalFieldManager;
import net.rim.device.api.ui.component.Dialog;
import net.rim.device.api.ui.component.EditField;
import net.rim.device.api.ui.component.PasswordEditField;
import net.rim.device.api.ui.component.SeparatorField;
import net.rim.device.api.ui.component.LabelField;
import net.rim.device.api.ui.component.CheckboxField;
import net.rim.device.api.ui.component.ObjectChoiceField;
import net.rim.device.api.ui.component.ButtonField;
import net.rim.device.api.ui.FieldChangeListener;
import net.rim.device.api.ui.component.Menu;
import net.rim.device.api.ui.MenuItem;
import net.rim.device.api.util.StringProvider;
import net.rim.device.api.command.Command;
import net.rim.device.api.command.CommandHandler;
import net.rim.device.api.command.ReadOnlyCommandMetadata;
public class UiFunMainScreen extends MainScreen implements FieldChangeListener {
BitmapField img;
EditField usernameField;
PasswordEditField passwordField;
ObjectChoiceField domainField;
CheckboxField rememberCheckBox;
ButtonField clearButton, loginButton;
public UiFunMainScreen(){
Bitmap logoBitmap = Bitmap.getBitmapResource("img/upd8rLOGO.png");
img = new BitmapField(logoBitmap, Field.FIELD_HCENTER);
add(img);
add(new SeparatorField());
add(new LabelField("Please Enter Your Credentials:"));
usernameField = new EditField("Username:","");
passwordField = new PasswordEditField("Password:","");
domainField = new ObjectChoiceField("Domain",new String[] {"Home","Work"});
rememberCheckBox = new CheckboxField("Remember password",false);
add(usernameField);add(passwordField);
add(domainField);
add(rememberCheckBox);
add(new SeparatorField());
clearButton = new ButtonField("Clear",ButtonField.CONSUME_CLICK);
loginButton = new ButtonField("Login",ButtonField.CONSUME_CLICK);
HorizontalFieldManager buttonManager = new HorizontalFieldManager(Field.FIELD_RIGHT);
buttonManager.add(clearButton);
buttonManager.add(loginButton);
add(buttonManager);
clearButton.setChangeListener(this);
//loginButton.setChangeListener(this);
loginButton.setCommand(new Command(LoginHandler));
}
//routing
public void fieldChanged(Field field, int context){
if(field == clearButton){
clearTextFields();
}else if(field == loginButton){
login();
}
}
private void login(){
if(usernameField.getTextLength()== 0 || passwordField.getTextLength() == 0){
Dialog.alert("You must enter a username and password");
}
else
{
String username = usernameField.getText();
String selectedDomain = (String) domainField.getChoice(domainField.getSelectedIndex());
LoginSuccessScreen loginSuccessScreen = new LoginSuccessScreen(username, selectedDomain);
UiApplication.getUiApplication().pushScreen(loginSuccessScreen);
}
}
public void clearTextFields()
{
usernameField.setText("");
passwordField.setText("");
}
protected void makeMenu(Menu menu, int instance){
super.makeMenu(menu, instance);
/*
menu.add(new MenuItem(new StringProvider("Login"),20,10){
public void run(){
login();
}
});
*/
//login menu item
MenuItem loginMenu = new MenuItem(new StringProvider("Login"),20,10);
loginMenu.setCommand(new Command(LoginHandler));
menu.add(loginMenu);
//clear text menu item
menu.add(new MenuItem(new StringProvider("Clear"),20,10){
public void run(){
clearTextFields();
}
});
}
class LoginCommandHandler extends CommandHandler
{
public void execute(ReadOnlyCommandMetadata metadata, Object context){
login();
}
}
}
및 에러 -
LoginHandler cannot be resolved to a variable UiFunMainScreen.java /UiFun/src/com/beginningblackberry/uifun line 69 Java Problem
모든 블랙 베리/자바 마법사 내가 잘못 가고 위치에 도움이 되거 (어떤 책에 대한 erata 없음)?
업데이트 아무도 정말 온 내가이라는 새로운 내부 클래스를 호출하는 질문 강타 대답하지
대신MenuItem loginMenu = new MenuItem(new StringProvider("Login"),20,10);
loginMenu.setCommand(new Command(new LoginCommandHandler()));
menu.add(loginMenu);
업데이트로 loginHandler 선언 이초 대답
클래스 변수도 작동 -
LoginCommandHandler loginHandler = new LoginCommandHandler();
http://www.blackberry.com/developers/docs/7.0.0api/net/rim/device/api/command/Command.html – Azodious