IceCream

-----MainActivity.java

public class MainActivity extends AppCompatActivity implements NotifyListener {

    private String[] arrayOfIceCream;
    private ListView listToShow;
    Button button;
    private int min = 40;
    private int max = 100;
    private int t = 1;
    int rand;
    int rand2 = rand - 1;



    //List Adapter with Ice Creams
    //SUM is added randomly
    //Thread
    //Button click = -1 sum

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        listToShow = findViewById(R.id.list_view);
        button = findViewById(R.id.button);

        arrayOfIceCream = new String [] {"Strawberry", "Chocolate", "Banana", "Cookies", "Watermelon"};
        final ArrayList<IceCream> listOfIceCream = new ArrayList<>();

        for(int index = 0; index < arrayOfIceCream.length; index++){
            Random r = new Random();
            rand = r.nextInt((max - min) + 1) + min;
            final IceCream nCream = new IceCream(arrayOfIceCream[index], rand);
            listOfIceCream.add(nCream);
        }

        Collections.sort(listOfIceCream, new Comparator<IceCream>() {
            @Override
            public int compare(IceCream o1, IceCream o2) {
                return Integer.valueOf(o2.getSum()).compareTo(o1.getSum());
            }
        });

        CustomAdapter myAdapter = new CustomAdapter(this, R.layout.custom_list_layout, listOfIceCream);
        listToShow.setAdapter(myAdapter);


        final Task task = new Task (MainActivity.this);

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                task.start();
            }
        });
    }

    @Override
    public void notifyEventSuccess() {
        runOnUiThread(new Runnable() {
            ArrayList<IceCream> listOfIceCream = new ArrayList<>();

            @Override
            public void run() {
                int rand;
                for(int index = 0; index < arrayOfIceCream.length; index++){
                    Random r = new Random();
                    rand = r.nextInt((max - min) + 1) + min;
                    IceCream nCream = new IceCream(arrayOfIceCream[index], rand);
                    listOfIceCream.add(nCream);
                }

                Collections.sort(listOfIceCream, new Comparator<IceCream>() {
                    @Override
                    public int compare(IceCream o1, IceCream o2) {
                        return Integer.valueOf(o2.getSum()).compareTo(o1.getSum());
                    }
                });

                CustomAdapter myAdapter = new CustomAdapter(MainActivity.this, R.layout.custom_list_layout, listOfIceCream);
                listToShow.setAdapter(myAdapter);
            }
        });
    }
}


----activity_mail.xml

<ListView
        android:id="@+id/list_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        />
    <TextView
        android:id="@+id/total_points"
        android:layout_width="match_parent"
        android:layout_height="60dp"
        app:layout_constraintBottom_toTopOf="@+id/list_view"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/list_view" />
    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="161dp"
        android:layout_marginLeft="161dp"
        android:layout_marginTop="16dp"
        android:layout_marginEnd="162dp"
        android:layout_marginRight="162dp"
        android:text="Button"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

----Task.java

package com.example.eurynomus.zadsladoledlikvidaciq;

public class Task extends Thread {
    private NotifyListener listener;

    public Task(NotifyListener l)
    {
        listener = l;
    }
    public void run(){

        Thread task1 = new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    Thread.sleep(3000);
                } catch (InterruptedException e)
                {
                    e.printStackTrace();
                }
            }
        });

        task1.start();

        try {
            task1.join();
        } catch (InterruptedException e)
        {
            e.printStackTrace();
        }

        listener.notifyEventSuccess();
    }
}

----NotifyListener.java
public interface NotifyListener {
    void notifyEventSuccess();
}


----CustomAdapter.java

package com.example.eurynomus.zadsladoledlikvidaciq;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;

import java.util.ArrayList;

public class CustomAdapter extends ArrayAdapter<IceCream> {
    private static final String TAG = "CustomAdapter";
    private Context mContext;
    private int mResource;

    public CustomAdapter(Context context, int resource, ArrayList<IceCream> objects) {
        super(context, resource, objects);
        mContext = context;
        mResource = resource;
    }


    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        String name = getItem(position).getName();
        int sum = getItem(position).getSum();

        IceCream iceCream = new IceCream(name, sum);

        LayoutInflater inflater = LayoutInflater.from(mContext);
        convertView = inflater.inflate(mResource, parent, false);

        TextView teamName = (TextView) convertView.findViewById(R.id.name);
        TextView teamScore = (TextView) convertView.findViewById(R.id.sum);

        teamName.setText(name);
        teamScore.setText("" + sum);

        return convertView;
    }
}

----Custom_list_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:id="@+id/name"
        android:layout_width="match_parent"
        android:layout_height="60dp"
        android:layout_weight="30"
        android:gravity="center"
        android:textAlignment="center" />

    <TextView
        android:id="@+id/sum"
        android:layout_width="match_parent"
        android:layout_height="60dp"
        android:layout_weight="70"
        android:gravity="center"
        android:textAlignment="center" />

</LinearLayout>

----IceCream.java

package com.example.eurynomus.zadsladoledlikvidaciq;

public class IceCream {

    private String name;
    private int sum;

    public IceCream(String name, Integer sum)
    {
        this.name = name;
        this.sum = sum;

    }

    public String getName()
    {
        return name;
    }
    public Integer getSum()
    {
        return sum;
    }
}