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Creating an alert dialog in Android is a common task for displaying messages to users or getting simple input.
Here's a basic guide on how to create and display an alert dialog using Android's AlertDialog class.

Basic Alert Dialog

Here's a simple example of creating and showing an alert dialog in an Android application.

Simple XML layout :

Implement Java in your Activity:

package com.globalsoftw.basic;

import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.speech.tts.TextToSpeech;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import androidx.activity.EdgeToEdge;
import androidx.annotation.MainThread;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.graphics.Insets;
import androidx.core.view.ViewCompat;
import androidx.core.view.WindowInsetsCompat;

public class MainActivity extends AppCompatActivity {

Button button;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
EdgeToEdge.enable(this);
setContentView(R.layout.activity_main);
button = findViewById(R.id.button);

button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
  new AlertDialog.Builder(MainActivity.this)
          .setTitle("This is title")
          .setMessage("Hello Aleart..........")
          // setCancelable true yes or false no
          .setCancelable(true)
          .setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
              //setNegativeButton Cancel Button
              @Override
              public void onClick(DialogInterface dialog, int which) {
                  button.setText("Dialog Cancel");
                  // Display Output
              }
          })
          .setNegativeButton("Okey", new DialogInterface.OnClickListener() {
              @Override
              public void onClick(DialogInterface dialog, int which) {
                  Toast.makeText(MainActivity.this, "Hello", Toast.LENGTH_SHORT).show();
              }
          })
          .setPositiveButton("I agreee", new DialogInterface.OnClickListener() {
              @Override
              public void onClick(DialogInterface dialog, int which) {

}
          })

.show();
}
});

}
}

Alert dialog in Android

Basic Alert Dialog

Simple XML layout :

Implement Java in your Activity:

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