feat(android): Allow to configure a default LocalNotification sound

android/capacitor/src/main/java/com/getcapacitor/plugin/notification/LocalNotification.java

@@ -1,6 +1,8 @@
 package com.getcapacitor.plugin.notification;
 
+import android.content.ContentResolver;
 import android.content.Context;
+import android.net.Uri;
 import android.util.Log;
 
 import com.getcapacitor.Config;
@@ -25,6 +27,7 @@ public class LocalNotification {
   private static final String CONFIG_KEY_PREFIX = "plugins.LocalNotifications.";
   private static final int RESOURCE_ID_ZERO_VALUE = 0;
   private static int defaultSmallIconID = RESOURCE_ID_ZERO_VALUE;
+  private static int defaultSoundID = RESOURCE_ID_ZERO_VALUE;
 
   private String title;
   private String body;
@@ -66,8 +69,20 @@ public void setSchedule(LocalNotificationSchedule schedule) {
     this.schedule = schedule;
   }
 
-  public String getSound() {
-    return sound;
+  public String getSound(Context context) {
+    String soundPath = null;
+    int resId = RESOURCE_ID_ZERO_VALUE;
+    String name = getResourceBaseName(sound);
+    if (name != null) {
+      resId = getResourceID(context, name, "raw");
+    }
+    if (resId == RESOURCE_ID_ZERO_VALUE) {
+      resId = getDefaultSound(context);
+    }
+    if(resId != RESOURCE_ID_ZERO_VALUE){
+      soundPath = ContentResolver.SCHEME_ANDROID_RESOURCE + "://" + context.getPackageName() + "/" + resId;
+    }
+    return soundPath;
   }
 
   public void setSound(String sound) {
@@ -258,6 +273,29 @@ private static int getDefaultSmallIcon(Context context){
     return resId;
   }
 
+  private static int getDefaultSound(Context context){
+    if(defaultSoundID != RESOURCE_ID_ZERO_VALUE) return defaultSoundID;
+
+    int resId = RESOURCE_ID_ZERO_VALUE;
+    String soundConfigResourceName = Config.getString(CONFIG_KEY_PREFIX + "sound");
+    soundConfigResourceName = getResourceBaseName(soundConfigResourceName);
+
+    if(soundConfigResourceName != null){
+      resId = getResourceID(context, soundConfigResourceName, "raw");
+    }
+
+    defaultSoundID = resId;
+    return resId;
+  }
+
+  public static Uri getDefaultSoundUrl(Context context){
+    int soundId = LocalNotification.getDefaultSound(context);
+    if (soundId != RESOURCE_ID_ZERO_VALUE) {
+      return Uri.parse(ContentResolver.SCHEME_ANDROID_RESOURCE + "://" + context.getPackageName() + "/" + soundId);
+    }
+    return null;
+  }
+
   public boolean isScheduled() {
     return this.schedule != null &&
             (this.schedule.getOn() != null ||

android/capacitor/src/main/java/com/getcapacitor/plugin/notification/LocalNotificationManager.java

@@ -8,6 +8,7 @@
 import android.content.Context;
 import android.content.Intent;
 import android.graphics.Color;
+import android.media.AudioAttributes;
 import android.net.Uri;
 import android.os.Build;
 import android.os.Bundle;
@@ -107,6 +108,13 @@ public void createNotificationChannel() {
       int importance = android.app.NotificationManager.IMPORTANCE_DEFAULT;
       NotificationChannel channel = new NotificationChannel(DEFAULT_NOTIFICATION_CHANNEL_ID, name, importance);
       channel.setDescription(description);
+      AudioAttributes audioAttributes = new AudioAttributes.Builder()
+              .setContentType(AudioAttributes.CONTENT_TYPE_SONIFICATION)
+              .setUsage(AudioAttributes.USAGE_ALARM).build();
+      Uri soundUri = LocalNotification.getDefaultSoundUrl(context);
+      if (soundUri != null) {
+        channel.setSound(soundUri, audioAttributes);
+      }
       // Register the channel with the system; you can't change the importance
       // or other notification behaviors after this
       android.app.NotificationManager notificationManager = context.getSystemService(android.app.NotificationManager.class);
@@ -153,23 +161,26 @@ private void buildNotification(NotificationManagerCompat notificationManager, Lo
             .setAutoCancel(true)
             .setOngoing(false)
             .setPriority(NotificationCompat.PRIORITY_DEFAULT)
-            .setGroupSummary(localNotification.isGroupSummary())
-            .setDefaults(Notification.DEFAULT_SOUND | Notification.DEFAULT_VIBRATE | Notification.DEFAULT_LIGHTS);
+            .setGroupSummary(localNotification.isGroupSummary());
 
 
     // support multiline text
     mBuilder.setStyle(new NotificationCompat.BigTextStyle().bigText(localNotification.getBody()));
 
-    String sound = localNotification.getSound();
+    String sound = localNotification.getSound(context);
     if (sound != null) {
       Uri soundUri = Uri.parse(sound);
       // Grant permission to use sound
       context.grantUriPermission(
               "com.android.systemui", soundUri,
               Intent.FLAG_GRANT_READ_URI_PERMISSION);
       mBuilder.setSound(soundUri);
+      mBuilder.setDefaults(Notification.DEFAULT_VIBRATE | Notification.DEFAULT_LIGHTS);
+    } else {
+      mBuilder.setDefaults(Notification.DEFAULT_ALL);
     }
 
+
     String group = localNotification.getGroup();
     if (group != null) {
       mBuilder.setGroup(group);

core/src/core-plugin-definitions.ts

@@ -1071,6 +1071,13 @@ export interface LocalNotification {
   body: string;
   id: number;
   schedule?: LocalNotificationSchedule;
+  /**
+   * Name of the audio file with extension.
+   * On iOS the file should be in the app bundle.
+   * On Android the file should be on res/raw folder.
+   * Doesn't work on Android version 26+ (Android O and newer), for
+   * Recommended format is .wav because is supported by both platforms.
+   */
   sound?: string;
   /**
    * Android-only: set a custom statusbar icon.

site/docs-md/apis/local-notifications/index.md

@@ -46,12 +46,14 @@ The local notification plugin allows the following configuration values to be ad
 
 - `smallIcon`: It allows you to set the default icon for the local notification.
 - `iconColor`: It allows you to set the default color for the local notification icon.
+- `sound`: It allows you to set the default notification sound. On Android 26+ it sets the default channel sound and can't be changed unless the app is uninstalled.
 
 ```json
  "plugins": {
     "LocalNotifications": {
       "smallIcon": "ic_stat_icon_config_sample",
-      "iconColor": "#488AFF"
+      "iconColor": "#488AFF",
+      "sound": "beep.wav"
     }
   }
 ```