Minecraft Forums

 ModPE.setItem(407, 6, 6, "New Item"); // this adds a new item (id, x, y, "name");
ModPE.setFoodItem (408, 6, 7, 5, "New Food"); //this adds a new food, (id, x, y, health gained, "name");
//the x and y, is the coordinates on the texture.png every single 1 coordinate is 16 pixels.

function useItem (x, y, z,itemId, blockId, side)//useItem Code goes here
{
if(itemId == 280)//If the item used is a stick
{
addItemInventory(407, 1); //add the item into you inventory
addItemInventory(408, 1); //add the new food into your inventory
clientMessage("Gained Custom Items!"); //client message sent when you tap a stick anywhere (when you gain new items)
}
}

Quote from darkdiamondminer

Thanks you helped me a lot. But can you give me a example on changing the damage.

function attackHook(attacker, victim) {
    if (getCarriedItem() == 318) { //flint
        preventDefault(); //cancel the normal attack damage
        // if you want to just add damage, you
        // might not need to cancel the existing damage.
        Entity.setHealth(victim, Entity.getHealth(victim) - 10); //5 hearts
        clientMessage("You sliced your victim open with a piece of flint");
    }
}