Why currentScreen == null?

[Hello World]

I want to get mc.currentScreen, but when I start mod currentScreen == null. Why?

ExampleMod.java

 

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package com.example.examplemod;

import cpw.mods.fml.client.registry.ClientRegistry;
import cpw.mods.fml.common.FMLCommonHandler;
import cpw.mods.fml.common.eventhandler.SubscribeEvent;
import net.minecraft.client.Minecraft;
import net.minecraft.client.gui.GuiScreen;
import net.minecraft.client.settings.KeyBinding;
import cpw.mods.fml.common.Mod;
import cpw.mods.fml.common.Mod.EventHandler;
import cpw.mods.fml.common.event.FMLInitializationEvent;
import net.minecraft.util.ChatComponentText;
import net.minecraftforge.client.event.GuiOpenEvent;
import net.minecraftforge.common.MinecraftForge;
import org.lwjgl.input.Keyboard;

@Mod(modid = ExampleMod.MODID, version = ExampleMod.VERSION)
public class ExampleMod
{
    public static final String MODID = "examplemod";
    public static final String VERSION = "1.0";

    /* Key Bindings */

    public static KeyBinding keyBinding = new KeyBinding("Test param", Keyboard.KEY_RIGHT, "Test container");

    @EventHandler
    public void init(FMLInitializationEvent event)
    {

        /* Key-Registery */
        ClientRegistry.registerKeyBinding(keyBinding);
        FMLCommonHandler.instance().bus().register(new KeyHandler());
        MinecraftForge.EVENT_BUS.register(new KeyHandler());
    }




}

 

 

 

 

 

KeyHandler.java

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package com.example.examplemod;

import ...;


public class KeyHandler {

    private static final double WALK_PER_STEP = 4.3 / 20;


    private  Minecraft mc = Minecraft.getMinecraft();

 @SubscribeEvent
    public  void pickup(PlayerInteractEvent event)
    {
        GuiScreen screen = Minecraft.getMinecraft().currentScreen;
        if (screen == null){
            mc.thePlayer.addChatComponentMessage(new ChatComponentText("Screen is null :("));
            return;
        }

        mc.thePlayer.addChatComponentMessage(new ChatComponentText("Hello World!"));
    }
}

 

 

 

 

I recive message: Screen is null

Why? How to fix it?

Edited February 24, 2019 by Hello World
Update code

[Hello World]

I want to get mc.currentScreen, but when I start mod currentScreen == null. Why?

ExampleMod.java

 

  Reveal hidden contents

package com.example.examplemod;

import cpw.mods.fml.client.registry.ClientRegistry;
import cpw.mods.fml.common.FMLCommonHandler;
import cpw.mods.fml.common.eventhandler.SubscribeEvent;
import net.minecraft.client.Minecraft;
import net.minecraft.client.gui.GuiScreen;
import net.minecraft.client.settings.KeyBinding;
import cpw.mods.fml.common.Mod;
import cpw.mods.fml.common.Mod.EventHandler;
import cpw.mods.fml.common.event.FMLInitializationEvent;
import net.minecraft.util.ChatComponentText;
import net.minecraftforge.client.event.GuiOpenEvent;
import net.minecraftforge.common.MinecraftForge;
import org.lwjgl.input.Keyboard;

@Mod(modid = ExampleMod.MODID, version = ExampleMod.VERSION)
public class ExampleMod
{
    public static final String MODID = "examplemod";
    public static final String VERSION = "1.0";

    /* Key Bindings */

    public static KeyBinding keyBinding = new KeyBinding("Test param", Keyboard.KEY_RIGHT, "Test container");

    @EventHandler
    public void init(FMLInitializationEvent event)
    {

        /* Key-Registery */
        ClientRegistry.registerKeyBinding(keyBinding);
        FMLCommonHandler.instance().bus().register(new KeyHandler());
        MinecraftForge.EVENT_BUS.register(new KeyHandler());
    }




}

 

 

 

 

 

KeyHandler.java

  Reveal hidden contents

package com.example.examplemod;

import ...;


public class KeyHandler {

    private static final double WALK_PER_STEP = 4.3 / 20;


    private  Minecraft mc = Minecraft.getMinecraft();

 @SubscribeEvent
    public  void pickup(PlayerInteractEvent event)
    {
        GuiScreen screen = Minecraft.getMinecraft().currentScreen;
        if (screen == null){
            mc.thePlayer.addChatComponentMessage(new ChatComponentText("Screen is null :("));
            return;
        }

        mc.thePlayer.addChatComponentMessage(new ChatComponentText("Hello World!"));
    }
}

 

 

 

 

I recive message: Screen is null

Why? How to fix it?

[Hello World]

Moderators, delete pls 

Edited February 24, 2019 by Hello World
Update text

[Avan12IsDead]

  On 2/24/2019 at 2:06 PM, Hello World said:

Moderators, delete pls 

Expand  

Why are you using the default java code then adding your own code I would recommend making your own package

[Avan12IsDead]

@SubscribeEvent
    public  void pickup(PlayerInteractEvent event)
    {
        GuiScreen screen = Minecraft.getMinecraft().currentScreen;
        if (screen == null){
            mc.thePlayer.addChatComponentMessage(new ChatComponentText("Screen is null :("));

            return;
        }

Do you know how to code? in the keyhandler file it says Screen Is Null  

mc.thePlayer.addChatComponentMessage(new ChatComponentText("Screen is null :("));

[DavidM]

  On 2/24/2019 at 2:54 PM, Avan12IsDead said:

Do you know how to code? in the keyhandler file it says Screen Is Null 

Expand  

That is his debug message. He knows what he is doing. He is asking why Minecraft.getMinecraft().currentScreen is null.

[Hello World]

@Avan12IsDead  I know it. But why? When I open chest some error. ( I want to get GuiContainer from chest)

Edited February 24, 2019 by Hello World

[Avan12IsDead]

  On 2/24/2019 at 3:01 PM, Hello World said:

@Avan12IsDead  I know it. But why? When I open chest some error. ( I want to get GuiContainer from chest)

Expand  

Explain what your code is doing from your mod.

[DavidM]

1. PlayerInteractEvent can be triggered from the server side, in which case the currentScreen is null, as the server side does not have a currently opened GUI. The currentScreen is only client side.

2. Please elucidate what you are trying to do, and we can perhaps figure out an alternative solution. We need some context of your problem.