Le Tutoriel de Android AlertDialog

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1- Android AlertDialog

Android AlertDialog est une boîte de dialogue qui affiche un message et assiste 1, 2 ou 3 buttons. Elle facilite la création d'une boîte de dialogue avec quelques lignes de code.
AlertDialog se compose de trois zones:
  1. Zone de titre (Title area)
  2. Zone de contenu (Content area)
  3. Zone des boutons (Buttons area)
Landscape screen
Portrait screen

Title area

Utiliser la méthode setTitle(), setIcon() pour définir le titre et l'icône d'une boîte de dialogue qui sont affichés dans Title area. Ou utilisez la méthode setCustomTitle(View) si vous voulez obtenir une zone de titre ( Title area) personnalisée.

Content area

La Zone de contenu ( Content area) peut afficher un message, une liste des options, etc.

Buttons area

Cette zone contient au maximum trois bouttons: Positive button, Negative button, Neutral button, dans lequels les deux premiers assistent Text & Icon, alors que Neutral button assiste uniquement Text, cependant, vous pouvez faire afficher son icône avec une petite astuce (Voir plus dans l'exemple).

2- Example d'AlertDialog (1)

Aperçu de l'exemple:
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();
    }
}

3- Exemple d'AlertDialog (2)

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();
    }
}

4- Exemple d'AlertDialog (List)

Voici un exemple d' AlertDialog avec une liste d'options pour les utilisateurs:
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();
    }

}

5- Exemple d'AlertDialog (Choix unique)

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();
    }

}

6- Exemple d'AlertDialog (Choix multiple)

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();
    }

}

7- Exemple de Title Area personnalisé

En appliquant la méthode setCustomTitle(View) vous pouvez personnaliser la zone de titre ( Title area) d' AlertDialog:
Et probablement utiliser Android Resource File pour créer l'interface pour la zone de titre ( 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, créer un Layout Resource File:
  • File > New > Android Resource File
    • File Name: layout_custom_title.xml
    • Resource type: Layout
    • Directory name: layout
Concevoir l'interface pour la zone de titre ( 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();
    }
}

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