MainActivity.java

package com.jonesrandom.tutorialalertdialog;

import android.content.DialogInterface;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    /// 3 VARIABEL BUTTON
    Button alertDialog1;
    Button alertDialog2;
    Button alertDialog3;

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

        /// INISIALISASI VARIABEL BUTTON DENGAN VIEW
        alertDialog1 = (Button) findViewById(R.id.alertDialog_1);
        alertDialog2 = (Button) findViewById(R.id.alertDialog_2);
        alertDialog3 = (Button) findViewById(R.id.alertDialog_3);

        /// MENAMBAH LISTENER DI SETIAP BUTTON
        alertDialog1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                /// MEMANGGIL ALERTDIALOG DENGAN 1 BUTTON 
                AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
                builder.setTitle("Ini AlertDialog Title");
                builder.setMessage("Ini Pesan dari AlertDialog");

                ///MENAMBAH BUTTON POSITIVE PADA BUILDER
                builder.setPositiveButton("OKE", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {
                        Toast.makeText(MainActivity.this, "AlertDialog Positive Button Di klik", Toast.LENGTH_SHORT).show();
                    }
                });
                
                AlertDialog dialog = builder.create();
                dialog.show();

            }
        });

        alertDialog2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                /// KODE UNTUK MEMANGGIL ALERTDIALOG
            }
        });

        alertDialog3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                /// KODE UNTUK MEMANGGIL ALERTDIALOG
            }
        });
    }
}