How to make in Android Studio so that the user can add his elements to the array at the click of a button?

Question

Android

I have an array

import kotlin.random.Random.Default.nextInt
fun main() {
    val a1 = "Медведь"
    val a2 = "Волк"
    val a3 = "Лиса"
    val a4 = "Заяц"
    val a5 = "Лев"
    val massive = arrayOf(a1, a2, a3,a4,a5)
    val arraySize = massive.size
    val randomaiz = nextInt(arraySize)
    val animals = "${massive[randomaiz]}"

    print(animals)
}

I want the user to be transferred, for example, to 3 activity by pressing a button, for example, he wrote a horse there. And the horse fell into the array, which now made it possible to randomly bring the horse out.

Answer 1

I can’t help with Kotlin, because I don’t know, but in Java this is done by intent.putExtra()
Pass it like this (in one Activity):

public void editcontent(int position){
        Intent intent = new Intent(mContext, EditUserItemAd.class);
        intent.putExtra("adid", adid.get(position));
        intent.putExtra("image1_url", mImages1.get(position));
        intent.putExtra("image2_url", mImages2.get(position));
        intent.putExtra("image3_url", mImages3.get(position));
        intent.putExtra("short_name", shortNames.get(position));
        intent.putExtra("full_name", fullNames.get(position));
        intent.putExtra("ad_price", price.get(position));
        intent.putExtra("ad_currency", currency.get(position));
        intent.putExtra("ad_neworused", neworused.get(position));
        intent.putExtra("ad_category1", adcat_ind1.get(position));
        intent.putExtra("ad_category2", adcat_ind2.get(position));
        intent.putExtra("imagename1", Imagename1.get(position));
        intent.putExtra("imagename2", Imagename2.get(position));
        intent.putExtra("imagename3", Imagename3.get(position));
        intent.putExtra("adactivated", activated.get(position));
        mContext.startActivity(intent);
    }

And take it like this (in another Activity):

private void getIncomingIntent() throws JSONException {
        Log.d(TAG, "getIncomingIntent: checking for incoming intents.");
        if(getIntent().hasExtra("image1_url") && getIntent().hasExtra("short_name")){
            Log.d(TAG, "getIncomingIntent: found intent extras.");
            String useradid =   getIntent().getStringExtra("adid");
            String image1Url =  getIntent().getStringExtra("image1_url");
            String image2Url =  getIntent().getStringExtra("image2_url");
            String image3Url =  getIntent().getStringExtra("image3_url");
            String shortName =  getIntent().getStringExtra("short_name");
            String fullName =   getIntent().getStringExtra("full_name");
            String price =      getIntent().getStringExtra("ad_price");
            String currency =   getIntent().getStringExtra("ad_currency");
            String condition =  getIntent().getStringExtra("ad_neworused");
            String category1 =  getIntent().getStringExtra("ad_category1");
            String category2 =  getIntent().getStringExtra("ad_category2");
            String imagename1 = getIntent().getStringExtra("imagename1");
            String imagename2 = getIntent().getStringExtra("imagename2");
            String imagename3 = getIntent().getStringExtra("imagename3");
            String adactive =   getIntent().getStringExtra("adactivated");
            photopath0 = imagename1;
            photopath1 = imagename2;
            photopath2 = imagename3;
            makeItemInterface(useradid, image1Url, image2Url, image3Url, shortName, fullName, price,currency,condition, category1,category2, adactive);
        }
    }

Answer 2

This thing is called a data model.
It must be able to save data between application launches.
At the first start of the application - initialization with initial data.
In the future, restoring the current state.
In the add activity, you simply call the model
's insert_new_value() method. In the greetings activity, the give_random_name() method
For storage, you can use room, sharedPreferns, work with files on your own.