activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="masxdeveloper.counter.MainActivity"
    android:orientation="vertical">


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_marginTop="20dp">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:orientation="vertical">

            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="Kasir 1"
                android:textSize="17sp"
                android:textStyle="bold"
                android:gravity="center"
                android:padding="10dp"/>
            <Button
                android:id="@+id/btn_kasir1"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="Kasir 1"/>

        </LinearLayout>
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:orientation="vertical">

            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="Kasir 2"
                android:textSize="17sp"
                android:textStyle="bold"
                android:gravity="center"
                android:padding="10dp"/>

            <Button
                android:id="@+id/btn_kasir2"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="Kasir 2" />

        </LinearLayout>
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:orientation="vertical">

            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="Kasir 3"
                android:textSize="17sp"
                android:textStyle="bold"
                android:gravity="center"
                android:padding="10dp"/>
            <Button
                android:id="@+id/btn_kasir3"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="Kasir 3"/>

        </LinearLayout>
    </LinearLayout>
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:text="Nomor Antrian Ke"
        android:textSize="17sp"
        android:gravity="center"/>
    <TextView
        android:id="@+id/nomor_antrian_kasir"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:text="0"
        android:textSize="50sp"
        android:gravity="center"/>

    <TextView
        android:id="@+id/nomor_antrian_dipanggil"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="Nomor Antrian Anda Dipanngil\nSilahkan Ke Kasir 2"
        android:textColor="@color/colorAccent"
        android:visibility="gone"/>
    <Button
        android:id="@+id/btn_nomor_antrian"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="ambil no. antrian"
        android:layout_marginTop="20dp"/>

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:text="Nomor Antrian"
        android:textSize="17sp"
        android:gravity="center"/>
    <TextView
        android:id="@+id/nomor_antrian_user"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:text="0"
        android:textSize="50sp"
        android:gravity="center"/>

</LinearLayout>

MainActivity.java

package masxdeveloper.counter;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    Button btn_nomor_antrian;

    Button Kasir1;
    Button Kasir2;
    Button Kasir3;

    TextView nomor_antarian_user;
    TextView nomor_antarian_kasir;
    TextView nomor_antarian_dipanggil;

    int NOMOR_ANTRIAN = 0;
    int NOMOR_ANTRIAN_KASIR = 0;

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

        nomor_antarian_user = (TextView) findViewById(R.id.nomor_antrian_user);
        nomor_antarian_kasir = (TextView) findViewById(R.id.nomor_antrian_kasir);
        nomor_antarian_dipanggil = (TextView) findViewById(R.id.nomor_antrian_dipanggil);

        btn_nomor_antrian = (Button) findViewById(R.id.btn_nomor_antrian);
        btn_nomor_antrian.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                NOMOR_ANTRIAN++;
                nomor_antarian_user.setText(String.valueOf(NOMOR_ANTRIAN));
            }
        });

        Kasir1 = (Button) findViewById(R.id.btn_kasir1);
        Kasir2 = (Button) findViewById(R.id.btn_kasir2);
        Kasir3 = (Button) findViewById(R.id.btn_kasir3);

        Kasir1.setOnClickListener(this);
        Kasir2.setOnClickListener(this);
        Kasir3.setOnClickListener(this);
    }

    @Override
    public void onClick(View view) {

        NOMOR_ANTRIAN_KASIR++;
        if (NOMOR_ANTRIAN == NOMOR_ANTRIAN_KASIR) {

            String Text = "Nomor Antrian Anda Dipanggil\n";

            switch (view.getId()) {
                case R.id.btn_kasir1:
                    Text = Text + "Silahkan Ke Kasir 1";
                    break;
                case R.id.btn_kasir2:
                    Text = Text + "Silahkan Ke Kasir 2";
                    break;
                case R.id.btn_kasir3:
                    Text = Text + "Silahkan Ke Kasir 3";
                    break;
            }

            nomor_antarian_dipanggil.setVisibility(View.VISIBLE);
            nomor_antarian_dipanggil.setText(Text);

        } else {
            nomor_antarian_dipanggil.setVisibility(View.GONE);
        }

        nomor_antarian_kasir.setText(String.valueOf(NOMOR_ANTRIAN_KASIR));

    }
}