1 hour ago, Villfuk02 said:

am i supposed to register it somewhere

 

Yes, to MinecraftForge.EVENT_BUS.

1 hour ago, diesieben07 said:

getRight returns an ItemStack. You check if it's equal to an Item. This is never going to be true.

Also, you will need to copy the stack before you set it as the output.

 

thx, works

I've changed the anvil method a little:

 @SubscribeEvent
	  public void handleAnvilEvent(AnvilUpdateEvent evt) {
		 ItemStack stack = evt.getLeft().copy();
		 if(stack.getItem().equals(ModTools.metal_detector)){
	    	if (evt.getRight().getItem().equals(Items.DYE)){
	    		if(evt.getRight().getMetadata() < 7){
	    			int antiIntegrity = 100 - stack.getCapability(DetectorProvider.DETECTOR_CAP, null).getIntegrity();
	    			int cost = (antiIntegrity * antiIntegrity) / 200 + 5;
	    			evt.setCost(cost);
	    			stack.getCapability(DetectorProvider.DETECTOR_CAP, null).setBattery(evt.getRight().getMetadata() + 1);
	    			stack.getCapability(DetectorProvider.DETECTOR_CAP, null).setIntegrity(stack.getCapability(DetectorProvider.DETECTOR_CAP, null).getIntegrity() - cost);
	    			evt.setOutput(stack);
	    		}
	    	}
		 }
	  }

But the integrity doesn't change and is allways 100
When i made it to print the integrity to chat, it printed the correct value...

BTW here are methods about Integrity from the Capability
 

@Override
	public void setIntegrity(int value) {
		integrity = value;
		if (integrity < 0)
			integrity = 0;
		if (integrity > 100)
			integrity = 100;
	}

	@Override
	public int getIntegrity() {
		return integrity;
	}

 IDK what is wrong with this, because setBattery() works

K, but try looking at the sample i sent you meanwhile please
I'm running out of time today and i'd like to fix it

Edited February 6, 20178 yr by Villfuk02