Make DefaultMediaNotificationProvider more configurable

Add a Builder to constructor DefaultMediaNotificationProvider. The
Builder can also set the provider's:
- notification ID
- notification channel ID
- notification channel name

The change adds an API for apps to set the small icon in notifications.

#minor-release
Issue: androidx/media#104
PiperOrigin-RevId: 462111536

RELEASENOTES.md

@@ -19,6 +19,12 @@
     *   Ensure commands are always executed in the correct order even if some
         require asynchronous resolution
         ([#85](https://github.com/androidx/media/issues/85)).
+    *   Add `DefaultNotificationProvider.Builder` to build
+        `DefaultNotificationProvider` instances. The builder can configure the
+        notification ID, the notification channel ID and the notification
+        channel name used by the provider. Also, add method
+        `DefaultNotificationProvider.setSmallIcon(int)` to set the notifications
+        small icon ([#104](https://github.com/androidx/media/issues/104)).
 
 ### 1.0.0-beta02 (2022-07-15)
 

libraries/session/build.gradle

@@ -32,6 +32,7 @@ android {
 }
 dependencies {
     api project(modulePrefix + 'lib-common')
+    compileOnly 'com.google.errorprone:error_prone_annotations:' + errorProneVersion
     compileOnly 'org.checkerframework:checker-qual:' + checkerframeworkVersion
     compileOnly 'org.checkerframework:checker-compat-qual:' + checkerframeworkCompatVersion
     implementation 'androidx.collection:collection:' + androidxCollectionVersion

libraries/session/src/main/java/androidx/media3/session/MediaSessionService.java

@@ -433,7 +433,8 @@ public abstract class MediaSessionService extends Service {
     synchronized (lock) {
       if (mediaNotificationManager == null) {
         if (mediaNotificationProvider == null) {
-          mediaNotificationProvider = new DefaultMediaNotificationProvider(getApplicationContext());
+          mediaNotificationProvider =
+              new DefaultMediaNotificationProvider.Builder(getApplicationContext()).build();
         }
         mediaNotificationManager =
             new MediaNotificationManager(