¿Cómo mostrar un cuadro de diálogo Sí/No en Android?

DialogBox se utiliza en muchas aplicaciones de Android para mostrar cuadros de diálogo. Hay diferentes tipos de cuadros de diálogo que se muestran en las aplicaciones de Android, como AlertDialog , cuadros de diálogo de advertencia y otros. En este artículo, veremos cómo mostrar un cuadro de diálogo Sí/No en Android. A continuación se muestra un video de muestra para tener una idea de lo que vamos a hacer en este artículo.

Nota : este artículo de Android cubre los lenguajes Java y Kotlin . 

Implementación paso a paso

Paso 1: crea un nuevo proyecto en Android Studio

Para crear un nuevo proyecto en Android Studio, consulte Cómo crear/iniciar un nuevo proyecto en Android Studio .

Paso 2: trabajar con el archivo activity_main.xml

Vaya a aplicación > res > diseño > actividad_principal.xml y agréguele el siguiente código. Se agregan comentarios en el código para conocer en detalle. 

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">
 
    <!--on below line we are creating
        a text for heading of our app-->
    <TextView
        android:id="@+id/idTVHeading"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_above="@id/idBtnDisplayDialog"
        android:layout_margin="20dp"
        android:gravity="center"
        android:padding="4dp"
        android:text="Yes/No Dialog Box"
        android:textAlignment="center"
        android:textColor="@color/purple_200"
        android:textSize="20sp"
        android:textStyle="bold" />
 
    <!--on below line we are creating a
        button for displaying a dialog-->
    <Button
        android:id="@+id/idBtnDisplayDialog"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:layout_margin="20dp"
        android:text="Show Dialog"
        android:textAllCaps="false" />
 
</RelativeLayout>

Paso 3: trabajar con el archivo MainActivity 

Vaya a aplicación > java > nombre del paquete de su aplicación > archivo MainActivity y agréguele el siguiente código. Se agregan comentarios en el código para conocer en detalle. 

package com.gtappdevelopers.kotlingfgproject
 
import android.content.DialogInterface
import android.os.Bundle
import android.widget.Button
import android.widget.Toast
import androidx.appcompat.app.AlertDialog
import androidx.appcompat.app.AppCompatActivity
 
class MainActivity : AppCompatActivity() {
 
    // on below line we are creating
    // variable for image view.
    lateinit var dialogBtn: Button
 
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
 
        // on below line we are initializing our variable with id.
        dialogBtn = findViewById(R.id.idBtnDisplayDialog)
 
        // on below line we are adding click listener for our button.
        dialogBtn.setOnClickListener {
 
            // on below line we are creating a dialog click listener
            // variable and initializing it.
            val dialogClickListener =
                DialogInterface.OnClickListener { dialog, which ->
                    when (which) {
                        // on below line we are setting a click listener
                        // for our positive button
                        DialogInterface.BUTTON_POSITIVE -> {
                            // on below line we are displaying a toast message.
                            Toast.makeText(this, "Yes clicked", Toast.LENGTH_SHORT).show()
                        }
 
                        // on below line we are setting click listener
                        // for our negative button.
                        DialogInterface.BUTTON_NEGATIVE -> {
                            // on below line we are dismissing our dialog box.
                            dialog.dismiss()
                        }
                    }
                }
 
            // on below line we are creating a builder variable for our alert dialog
            val builder: AlertDialog.Builder = AlertDialog.Builder(this)
 
            // on below line we are setting message for our dialog box.
            builder.setMessage("Select yes to display toast message and no to dismiss the dialog ?")
                // on below line we are setting positive
                // button and setting text to it.
                .setPositiveButton("Yes", dialogClickListener)
                // on below line we are setting negative button
                // and setting text to it.
                .setNegativeButton("No", dialogClickListener)
                // on below line we are calling
                // show to display our dialog.
                .show()
        }
    }
}

package com.gtappdevelopers.kotlingfgproject;
 
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
 
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
 
public class MainActivity extends AppCompatActivity {
 
    // on below line we are creating a variable for our button.
    private Button dialogBtn;
    private DialogInterface.OnClickListener dialogClickListener;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        // on below line we are initializing variables with ids.
        dialogBtn = findViewById(R.id.idBtnDisplayDialog);
 
        // on below line we are adding click listener for our dialog button
        dialogBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // on below line we are creating a dialog click listener
                // variable and initializing it.
                dialogClickListener = new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        switch (which) {
                            // on below line we are setting a click listener
                            // for our positive button
                            case DialogInterface.BUTTON_POSITIVE:
                                // on below line we are displaying a toast message.
                                Toast.makeText(MainActivity.this, "Yes clicked", Toast.LENGTH_SHORT).show();
                                break;
                            // on below line we are setting click listener
                            // for our negative button.
                            case DialogInterface.BUTTON_NEGATIVE:
                                // on below line we are dismissing our dialog box.
                                dialog.dismiss();
 
                        }
                    }
                };
                // on below line we are creating a builder variable for our alert dialog
                AlertDialog.Builder builder = new AlertDialog.Builder(getApplicationContext());
                // on below line we are setting message for our dialog box.
                builder.setMessage("Select yes to display toast message and no to dismiss the dialog ?")
                        // on below line we are setting positive button
                        // and setting text to it.
                        .setPositiveButton("Yes", dialogClickListener)
                        // on below line we are setting negative button
                        // and setting text to it.
                        .setNegativeButton("No", dialogClickListener)
                        // on below line we are calling
                        // show to display our dialog.
                        .show();
 
            }
        });
    }
}

Ahora ejecute su aplicación para ver el resultado. 

Producción: