Руководство Android AlertDialog
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Android AlertDialog это диалоговое окно отображающее сообщение и поддерживает 1, 2 или 3 button, он помогает вам легко создавать диалоговое окно с несколькими кодовыми строкамию

AlertDialog включает 3 зоны:
- Зона заголовка (Title area)
- Зона содержания (Content area)
- Зона содержащая кнопки (Buttons area)

Landscape screen

Portrait screen
Title area
Используйте метод setTitle(), setIcon() чтобы настроить заголовок и иконку для диалогового окна, они будут видны на Title area. Или используйте метод setCustomTitle(View) если вы хотите получить кастомизированную зону заголовка (Title area).
Content area
Зона содержания (Content area) может отображать сообщение, список выборов,...
Buttons area
Данная зона имеет максимум 3 button: Positive button, Negative button, Neutral button. В них 2 первые button поддерживают Text & Icon, а Neutral button поддерживает только Text, но вы можете отобразить для нее иконку с маленьким трюком (Смотрите в примере).
Просмотр примера:

AlertButtonExample0.java
package org.o7planning.alertdialogexample;
import android.content.Context;
import android.content.DialogInterface;
import android.graphics.drawable.Drawable;
import android.widget.Toast;
import androidx.appcompat.app.AlertDialog;
public class AlertDialogExample0 {
public static void showAlertDialog(final Context context) {
final Drawable positiveIcon = context.getResources().getDrawable(R.drawable.icon_positive);
final Drawable negativeIcon = context.getResources().getDrawable(R.drawable.icon_negative);
final Drawable neutralIcon = context.getResources().getDrawable(R.drawable.icon_neutral);
AlertDialog.Builder builder = new AlertDialog.Builder(context);
// Set Title and Message:
builder.setTitle("Title").setMessage("This is a message");
//
builder.setCancelable(true);
builder.setIcon(R.drawable.icon_title);
// Create "Positive" button with OnClickListener.
builder.setPositiveButton("Positive", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
Toast.makeText(context,"You choose positive button",
Toast.LENGTH_SHORT).show();
}
});
builder.setPositiveButtonIcon(positiveIcon);
// Create "Negative" button with OnClickListener.
builder.setNegativeButton("Negative", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
Toast.makeText(context,"You choose positive button",
Toast.LENGTH_SHORT).show();
// Cancel
dialog.cancel();
}
});
builder.setNegativeButtonIcon(negativeIcon);
// Create "Neutral" button with OnClickListener.
builder.setNeutralButton("Neutral", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// Action for 'NO' Button
Toast.makeText(context,"You choose neutral button",
Toast.LENGTH_SHORT).show();
}
});
builder.setNeutralButtonIcon(neutralIcon); // Not working!!!
// Create AlertDialog:
AlertDialog alert = builder.create();
alert.show();
}
}

AlertDialogExample2.java
package org.o7planning.alertdialogexample;
import android.app.Activity;
import android.content.Context;
import android.content.DialogInterface;
import android.graphics.drawable.Drawable;
import android.widget.Toast;
import androidx.appcompat.app.AlertDialog;
public class AlertDialogExample2 {
public static void showAlertDialog(final Context context) {
final Drawable positiveIcon = context.getResources().getDrawable(R.drawable.icon_positive);
final Drawable negativeIcon = context.getResources().getDrawable(R.drawable.icon_negative);
AlertDialog.Builder builder = new AlertDialog.Builder(context);
// Set Title and Message:
builder.setTitle("Confirmation").setMessage("Do you want to close this app?");
//
builder.setCancelable(true);
builder.setIcon(R.drawable.icon_title);
// Create "Yes" button with OnClickListener.
builder.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
Toast.makeText(context,"You choose Yes button",
Toast.LENGTH_SHORT).show();
Activity activity = (Activity) context;
activity.finish();
}
});
builder.setPositiveButtonIcon(positiveIcon);
// Create "No" button with OnClickListener.
builder.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
Toast.makeText(context,"You choose No button",
Toast.LENGTH_SHORT).show();
// Cancel
dialog.cancel();
}
});
builder.setNegativeButtonIcon(negativeIcon);
// Create AlertDialog:
AlertDialog alert = builder.create();
alert.show();
}
}
Например AlertDialog со списком выборов для пользователя.

AlertDialogListExample.java
package org.o7planning.alertdialogexample;
import android.app.Activity;
import android.content.Context;
import android.content.DialogInterface;
import android.graphics.drawable.Drawable;
import android.widget.Toast;
import androidx.appcompat.app.AlertDialog;
public class AlertDialogListExample {
public static void showAlertDialog(final Activity activity) {
final Drawable negativeIcon = activity.getResources().getDrawable(R.drawable.icon_negative);
AlertDialog.Builder builder = new AlertDialog.Builder(activity);
// Set Title.
builder.setTitle("Select an Animal");
// Add a list
final String[] animals = {"Horse", "Cow", "Camel", "Sheep", "Goat"};
builder.setItems(animals, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
String animal = animals[which];
dialog.dismiss(); // Close Dialog
// Do some thing....
// For example: Call method of MainActivity.
Toast.makeText(activity,"You select: " + animal,
Toast.LENGTH_SHORT).show();
// activity.someMethod(animal);
}
});
//
builder.setCancelable(true);
builder.setIcon(R.drawable.icon_title);
// Create "Cancel" button with OnClickListener.
builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
Toast.makeText(activity,"You choose No button",
Toast.LENGTH_SHORT).show();
// Cancel
dialog.cancel();
}
});
builder.setNegativeButtonIcon(negativeIcon);
// Create AlertDialog:
AlertDialog alert = builder.create();
alert.show();
}
}

AlertDialogSingleChoiceExample.java
package org.o7planning.alertdialogexample;
import android.app.Activity;
import android.content.DialogInterface;
import android.widget.Toast;
import androidx.appcompat.app.AlertDialog;
import java.util.HashSet;
import java.util.Set;
public class AlertDialogSingleChoiceExample {
public static void showAlertDialog(final Activity activity) {
AlertDialog.Builder builder = new AlertDialog.Builder(activity);
// Set Title.
builder.setTitle("Select an Animal");
// Add a list
final String[] animals = {"Horse", "Cow", "Camel", "Sheep", "Goat"};
int checkedItem = 3; // Sheep
final Set<String> selectedItems = new HashSet<String>();
selectedItems.add(animals[checkedItem]);
builder.setSingleChoiceItems(animals, checkedItem, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// Do Something...
selectedItems.clear();
selectedItems.add(animals[which]);
}
});
//
builder.setCancelable(true);
builder.setIcon(R.drawable.icon_title);
// Create "Yes" button with OnClickListener.
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
if(selectedItems.isEmpty()) {
return;
}
String animal = selectedItems.iterator().next();
// Close Dialog
dialog.dismiss();
// Do something, for example: Call a method of Activity...
Toast.makeText(activity,"You select " + animal,
Toast.LENGTH_SHORT).show();
}
});
// Create "Cancel" button with OnClickListener.
builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
Toast.makeText(activity,"You choose Cancel button",
Toast.LENGTH_SHORT).show();
// Cancel
dialog.cancel();
}
});
// Create AlertDialog:
AlertDialog alert = builder.create();
alert.show();
}
}

AlertDialogMultiChoiceExample.java
package org.o7planning.alertdialogexample;
import android.app.Activity;
import android.content.DialogInterface;
import android.widget.Toast;
import androidx.appcompat.app.AlertDialog;
import java.util.HashSet;
import java.util.Set;
public class AlertDialogMultiChoiceExample {
public static void showAlertDialog(final Activity activity) {
AlertDialog.Builder builder = new AlertDialog.Builder(activity);
// Set Title.
builder.setTitle("Select an Animal");
// Add a list
final String[] animals = {"Horse", "Cow", "Camel", "Sheep", "Goat"};
final boolean[] checkedInfos = new boolean[]{false, false, false, true, false}; // Sheep
builder.setMultiChoiceItems(animals, checkedInfos, new DialogInterface.OnMultiChoiceClickListener() {
@Override
public void onClick(DialogInterface dialog, int which, boolean isChecked) {
checkedInfos[which] = isChecked;
}
});
//
builder.setCancelable(true);
builder.setIcon(R.drawable.icon_title);
// Create "Yes" button with OnClickListener.
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// Close Dialog
dialog.dismiss();
String s= null;
for(int i=0; i< animals.length;i++) {
if(checkedInfos[i]) {
if(s == null) {
s = animals[i];
} else {
s+= ", " + animals[i];
}
}
}
s = s == null? "":s;
// Do something, for example: Call a method of Activity...
Toast.makeText(activity,"You select " + s,
Toast.LENGTH_SHORT).show();
}
});
// Create "Cancel" button with OnClickListener.
builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
Toast.makeText(activity,"You choose Cancel button",
Toast.LENGTH_SHORT).show();
// Cancel
dialog.cancel();
}
});
// Create AlertDialog:
AlertDialog alert = builder.create();
alert.show();
}
}
Применяя метод setCustomTitle(View) вы можете кастомизировать зону заголовка (Title area) у AlertDialog:

И можете использовать Android Resource File чтобы создать интерфейс для зоны заголовка (Title area).
AlertDialog.Builder builder = new AlertDialog.Builder(context);
// Custom Title Area.
LayoutInflater inflater = context.getLayoutInflater();
View view = inflater.inflate(R.layout.layout_custom_title, null);
builder.setCustomTitle(view);
...
// Create AlertDialog:
AlertDialog alert = builder.create();
alert.show();
OK, создайте Layout Resource File:
- File > New > Android Resource File
- File Name: layout_custom_title.xml
- Resource type: Layout
- Directory name: layout

Смоделируйте интерфейс для зоны заголовка (Title area):

layout_custom_title.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
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">
<ImageView
android:id="@+id/imageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="@drawable/icon_title" />
<TextView
android:id="@+id/textView"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginLeft="16dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="16dp"
android:layout_marginRight="16dp"
android:background="#E3DCC4"
android:gravity="center"
android:text="This is the Title"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/imageView" />
</androidx.constraintlayout.widget.ConstraintLayout>
AlertDialogCustomTitleExample.java
package org.o7planning.alertdialogexample;
import android.app.Activity;
import android.content.Context;
import android.content.DialogInterface;
import android.graphics.drawable.Drawable;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Toast;
import androidx.appcompat.app.AlertDialog;
public class AlertDialogCustomTitleExample {
public static void showAlertDialog(final Activity context) {
final Drawable positiveIcon = context.getResources().getDrawable(R.drawable.icon_positive);
AlertDialog.Builder builder = new AlertDialog.Builder(context);
// Custom Title Area.
LayoutInflater inflater = context.getLayoutInflater();
View view = inflater.inflate(R.layout.layout_custom_title, null);
builder.setCustomTitle(view);
// Message.
builder.setMessage("This is AlertDialog with Custom Title Area");
//
builder.setCancelable(true);
builder.setIcon(R.drawable.icon_title);
// Create "OK" button with OnClickListener.
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
}
});
builder.setPositiveButtonIcon(positiveIcon);
// Create AlertDialog:
AlertDialog alert = builder.create();
alert.show();
}
}