java - 更新后 codename1 NullPointerException

Question

项目设置更新后，我收到此 NullPointerException[EDT] 0:0:0,0 - 代号一修订:e5578786e9d343acce705b819a37288d29591b72

[EDT] 0:0:0,71 - 异常:java.lang.NullPointerException - nulljava.lang.NullPointerException 在 com.codename1.ui.SideMenuBar$CommandWrapper.actionPerformed(SideMenuBar.java:1788) 在 com.codename1.ui.util.EventDispatcher.fireActionEvent(EventDispatcher.java:349) 在 com.codename1.ui.Button.fireActionEvent(Button.java:491) 在 com.codename1.ui.Button.released(Button.java:533) 在 com.codename1.ui.Button.pointerReleased(Button.java:637) 在com.codename1.ui.Form.pointerReleased(Form.java:2807) 在 com.codename1.ui.Component.pointerReleased(Component.java:4016) 在 com.codename1.ui.Display.handleEvent(Display.java:2032) 在 com.codename1.ui.Display.edtLoopImpl(Display.java:1028) 在 com.codename1.ui.Display.mainEDTLoop(Display.java:946) 在 com.codename1.ui.RunnableWrapper.run(RunnableWrapper.java:120) 在 com.codename1.impl.CodenameOneThread.run(CodenameOneThread.java:176)

代号one中似乎有一些东西。有谁知道怎么处理吗？

编辑。

好的@Shai，我想我找到了为什么你无法重现异常的原因。我已经安装了新插件 v3.8。名为“Forms Navigation”的示例模板现在生成与以前完全不同的代码。所以我认为你正在测试这个新代码，女巫在我的机器上工作得很好，但我已经在以前的示例代码之上构建了我的项目(见下文)。因此，如果我是正确的，请您尝试测试一下以前的代码，看看是否会遇到相同的异常。

package dk.cp3.anchorsafe;

import com.codename1.ui.Button;
import com.codename1.ui.CheckBox;
import com.codename1.ui.Display;
import com.codename1.ui.Form;
import com.codename1.ui.plaf.UIManager;
import com.codename1.ui.util.Resources;
import com.codename1.ui.Command;
import com.codename1.ui.Dialog;
import com.codename1.ui.FontImage;
import com.codename1.ui.Image;
import com.codename1.ui.Label;
import com.codename1.ui.NavigationCommand;
import com.codename1.ui.RadioButton;
import com.codename1.ui.Slider;
import com.codename1.ui.TextField;
import com.codename1.ui.Toolbar;
import com.codename1.ui.events.ActionEvent;
import com.codename1.ui.events.ActionListener;
import com.codename1.ui.layouts.BoxLayout;

/**
 * This file was generated by <a href="https://www.codenameone.com/">Codename One</a> for the purpose 
 * of building native mobile applications using Java.
 */
public class AnchorSafely {

    private Form current;
    private Resources theme;

    private Form home;

    public void init(Object context) {
        theme = UIManager.initFirstTheme("/theme");

        // Enable Toolbar on all Forms by default
        Toolbar.setGlobalToolbar(true);

        // Pro only feature, uncomment if you have a pro subscription
        // Log.bindCrashProtection(true);
    }

    public void start() {
        if (current != null) {
            current.show();
            return;
        }

        //create and build the home Form
        home = new Form("Home");
        home.setLayout(new BoxLayout(BoxLayout.Y_AXIS));
        home.addComponent(new Label("This is a Label"));
        home.addComponent(new Button("This is a Button"));
        TextField txt = new TextField();
        txt.setHint("This is a TextField");
        home.addComponent(txt);
        home.addComponent(new CheckBox("This is a CheckBox"));
        RadioButton rb1 = new RadioButton("This is a Radio Button 1");
        rb1.setGroup("group");
        home.addComponent(rb1);
        RadioButton rb2 = new RadioButton("This is a Radio Button 2");
        rb2.setGroup("group");
        home.addComponent(rb2);
        final Slider s = new Slider();
        s.setText("50%");
        s.setProgress(50);
        s.setEditable(true);
        s.setRenderPercentageOnTop(true);
        home.addComponent(s);

        Button b1 = new Button("Show a Dialog");
        b1.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent evt) {
                Dialog.show("Dialog Title", "Dialog Body", "Ok", "Cancel");
            }
        });
        home.addComponent(b1);

        //Create Form1 and Form2 and set a Back Command to navigate back to the home Form        
        Form form1 = new Form("Form1");
        setBackCommand(form1);
        Form form2 = new Form("Form2");
        setBackCommand(form2);

        //Add navigation commands to the home Form
        NavigationCommand homeCommand = new NavigationCommand("Home");
        homeCommand.setNextForm(home);
        home.getToolbar().addCommandToSideMenu(homeCommand);

        NavigationCommand cmd1 = new NavigationCommand("Form1");
        cmd1.setNextForm(form1);
        home.getToolbar().addCommandToSideMenu(cmd1);

        NavigationCommand cmd2 = new NavigationCommand("Form2");
        cmd2.setNextForm(form2);
        home.getToolbar().addCommandToSideMenu(cmd2);

        //Add Edit, Add and Delete Commands to the home Form context Menu
        Image im = FontImage.createMaterial(FontImage.MATERIAL_MODE_EDIT, UIManager.getInstance().getComponentStyle("Command"));
        Command edit = new Command("Edit", im) {

            @Override
            public void actionPerformed(ActionEvent evt) {
                System.out.println("Editing");
            }
        };
        home.getToolbar().addCommandToOverflowMenu(edit);

        im = FontImage.createMaterial(FontImage.MATERIAL_LIBRARY_ADD, UIManager.getInstance().getComponentStyle("Command"));
        Command add = new Command("Add", im) {

            @Override
            public void actionPerformed(ActionEvent evt) {
                System.out.println("Adding");
            }
        };
        home.getToolbar().addCommandToOverflowMenu(add);

        im = FontImage.createMaterial(FontImage.MATERIAL_DELETE, UIManager.getInstance().getComponentStyle("Command"));
        Command delete = new Command("Delete", im) {

            @Override
            public void actionPerformed(ActionEvent evt) {
                System.out.println("Deleting");
            }

        };
        home.getToolbar().addCommandToOverflowMenu(delete);

        home.show();
    }

    protected void setBackCommand(Form f) {
        Command back = new Command("") {

            @Override
            public void actionPerformed(ActionEvent evt) {
                home.showBack();
            }

        };
        Image img = FontImage.createMaterial(FontImage.MATERIAL_ARROW_BACK, UIManager.getInstance().getComponentStyle("TitleCommand"));
        back.setIcon(img);
        f.getToolbar().addCommandToLeftBar(back);
        f.getToolbar().setTitleCentered(true);
        f.setBackCommand(back);
    }

    public void stop() {
        current = Display.getInstance().getCurrent();
    }

    public void destroy() {
    }

}

Answer 1

当我看到视频时，我注意到您使用了商业主题，我认为这不是问题的原因，但事实确实如此。业务主题定义了已弃用的 commandBehavior 主题常量，您只需删除该常量即可解决此问题。