Cómo mostrar un mensaje de alerta en Android (JAVA) – Rıza Doğukan Koşar

1. Cree un generador de diálogo:

AlertDialog.Builder alert = new AlertDialog.Builder(this);

2. Título y mensaje:

alert.setTitle("My Title");
alert.setMessage("The message in Alert");

3. Botones:

alert.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(getApplicationContext(), "Pushed yes", Toast.LENGTH_SHORT).show();
}
});alert.setNegativeButton("No", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(getApplicationContext(), "Pushed no", Toast.LENGTH_SHORT).show();
}
});

4. Se muestra el cuadro de diálogo:

alert.show();

Código completo:

AlertDialog.Builder alert = new AlertDialog.Builder(this);
alert.setTitle("My Title");
alert.setMessage("The message in Alert");
alert.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(getApplicationContext(), "Pushed yes", Toast.LENGTH_SHORT).show();
}
});
alert.setNegativeButton("No", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(getApplicationContext(), "Pushed no", Toast.LENGTH_SHORT).show();
}
});
alert.show();