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Les illustrations d'éléments multimédias doivent être transmises sous la forme d'un URI local en utilisant ContentResolver.SCHEME_CONTENT ou ContentResolver.SCHEME_ANDROID_RESOURCE. Cet URI local doit correspondre à un bitmap ou un drawable vectoriel dans les ressources de l'application. Pour les objets MediaDescriptionCompat représentant des éléments de la hiérarchie de contenu, transmettez l'URI via setIconUri.
Pour les objets MediaMetadataCompat représentant l'élément en cours de lecture, utilisez l'une des clés suivantes pour transmettre l'URI via putString :
Ces étapes décrivent comment télécharger une illustration à partir d'un URI Web et comment l'exposer via un URI local. Pour obtenir un exemple complet, consultez l'implémentation de openFile et des méthodes proches dans l'application exemple Universal Android Music Player.
Créez un URI content:// correspondant à l'URI Web. Le service de navigateur multimédia et la session multimédia doivent transmettre cet URI de contenu à Android Auto et à Android Automotive OS (AAOS).
Kotlin
funUri.asAlbumArtContentURI():Uri{returnUri.Builder().scheme(ContentResolver.SCHEME_CONTENT).authority(CONTENT_PROVIDER_AUTHORITY).appendPath(this.getPath())// Make sure you trust the URI.build()}
Java
publicstaticUriasAlbumArtContentURI(UriwebUri){returnnewUri.Builder().scheme(ContentResolver.SCHEME_CONTENT).authority(CONTENT_PROVIDER_AUTHORITY).appendPath(webUri.getPath())// Make sure you trust the URI!.build();}
Dans votre implémentation de ContentProvider.openFile, vérifiez s'il existe un fichier pour l'URI correspondant. Si ce n'est pas le cas, téléchargez et mettez en cache le fichier image. Cet extrait de code utilise Glide.
Le contenu et les exemples de code de cette page sont soumis aux licences décrites dans la Licence de contenu. Java et OpenJDK sont des marques ou des marques déposées d'Oracle et/ou de ses sociétés affiliées.
Dernière mise à jour le 2025/08/22 (UTC).
[null,null,["Dernière mise à jour le 2025/08/22 (UTC)."],[],[],null,["# Display media artwork\n\nArtwork for media items must be passed as a local URI using either\n[`ContentResolver.SCHEME_CONTENT`](/reference/android/content/ContentResolver#SCHEME_CONTENT) or\n[`ContentResolver.SCHEME_ANDROID_RESOURCE`](/reference/android/content/ContentResolver#SCHEME_ANDROID_RESOURCE). This local URI must resolve to\neither a bitmap or a vector drawable.\n\n- For `MediaDescriptionCompat` objects representing items in the [content\n hierarchy](/training/cars/media/create-media-browser/content-hierarchy#onLoadChildren), pass the URI through [`setIconUri`](/reference/android/support/v4/media/MediaDescriptionCompat.Builder#setIconUri(android.net.Uri)).\n\n | **Warning:** Don't provide artwork using [`setIconBitmap`](/reference/android/support/v4/media/MediaDescriptionCompat.Builder#setIconUri(android.net.Uri)). While this method is supported on Android Auto, it isn't supported on Android Automotive OS (AAOS). Additionally, including many bitmaps in a result can cause you to exceed the [1MB binder size limit](/guide/components/activities/parcelables-and-bundles#sdbp), causing your app to be unresponsive.\n- For `MediaMetadataCompat` objects representing the [playing item](/media/legacy/mediasession#maintain-state),\n use any of these keys to pass the URI through [`putString`](/reference/android/support/v4/media/MediaMetadataCompat.Builder#putString(java.lang.String,%20java.lang.String)):\n\n - [`MediaMetadataCompat.METADATA_KEY_DISPLAY_ICON_URI`](/reference/android/support/v4/media/MediaMetadataCompat#METADATA_KEY_DISPLAY_ICON_URI())\n - [`MediaMetadataCompat.METADATA_KEY_ART_URI`](/reference/android/support/v4/media/MediaMetadataCompat#METADATA_KEY_ART_URI())\n - [`MediaMetadataCompat.METADATA_KEY_ALBUM_ART_URI`](/reference/android/support/v4/media/MediaMetadataCompat#METADATA_KEY_ALBUM_ART_URI())\n\nProvide artwork from your app's resources\n-----------------------------------------\n\nTo provide drawables from your [app's resources](/guide/topics/resources/providing-resources), pass a URI in the\nfollowing format: \n\n android.resource://\u003cvar translate=\"no\"\u003ePACKAGE_NAME\u003c/var\u003e/\u003cvar translate=\"no\"\u003eRESOURCE_TYPE\u003c/var\u003e/\u003cvar translate=\"no\"\u003eRESOURCE_NAME\u003c/var\u003e\n\n // Example URI - note that there is no file extension at the end of the URI\n android.resource://com.example.app/drawable/example_drawable\n\nThis snippet demonstrates how to create a URI of this format from a resource ID: \n\n val resources = context.resources\n val resourceId: Int = R.drawable.example_drawable\n\n Uri.Builder()\n .scheme(ContentResolver.SCHEME_ANDROID_RESOURCE)\n .authority(resources.getResourcePackageName(resourceId))\n .appendPath(resources.getResourceTypeName(resourceId))\n .appendPath(resources.getResourceEntryName(resourceId))\n .build()\n\nProvide artwork using a content provider\n----------------------------------------\n\nThese steps describe how to download art from a web URI and expose it through a\nlocal URI using a [content provider](/guide/topics/providers/content-provider-creating). For a complete example, see the\n[implementation](https://github.com/android/uamp/blob/99e44c1c5106218c62eff552b64bbc12f1883a22/common/src/main/java/com/example/android/uamp/media/library/AlbumArtContentProvider.kt#L52) of [`openFile`](/reference/android/content/ContentProvider#openFile(android.net.Uri,%20java.lang.String)) and the surrounding methods in the\nUniversal Android Music Player sample app.\n\n1. Build a `content://` URI corresponding to the web URI. The media browser\n service and media session pass this content URI to Android Auto and\n AAOS.\n\n ### Kotlin\n\n fun Uri.asAlbumArtContentURI(): Uri {\n return Uri.Builder()\n .scheme(ContentResolver.SCHEME_CONTENT)\n .authority(CONTENT_PROVIDER_AUTHORITY)\n .appendPath(this.getPath()) // Make sure you trust the URI\n .build()\n }\n\n ### Java\n\n public static Uri asAlbumArtContentURI(Uri webUri) {\n return new Uri.Builder()\n .scheme(ContentResolver.SCHEME_CONTENT)\n .authority(CONTENT_PROVIDER_AUTHORITY)\n .appendPath(webUri.getPath()) // Make sure you trust the URI!\n .build();\n }\n\n2. In your implementation of `ContentProvider.openFile`, check if a file exists\n for the corresponding URI. If not, download and cache the image file. This\n code snippet uses [Glide](https://github.com/bumptech/glide).\n\n ### Kotlin\n\n override fun openFile(uri: Uri, mode: String): ParcelFileDescriptor? {\n val context = this.context ?: return null\n val file = File(context.cacheDir, uri.path)\n if (!file.exists()) {\n val remoteUri = Uri.Builder()\n .scheme(\"https\")\n .authority(\"my-image-site\")\n .appendPath(uri.path)\n .build()\n val cacheFile = Glide.with(context)\n .asFile()\n .load(remoteUri)\n .submit()\n .get(DOWNLOAD_TIMEOUT_SECONDS, TimeUnit.SECONDS)\n\n cacheFile.renameTo(file)\n file = cacheFile\n }\n return ParcelFileDescriptor.open(file, ParcelFileDescriptor.MODE_READ_ONLY)\n }\n\n ### Java\n\n @Nullable\n @Override\n public ParcelFileDescriptor openFile(@NonNull Uri uri, @NonNull String mode)\n throws FileNotFoundException {\n Context context = this.getContext();\n File file = new File(context.getCacheDir(), uri.getPath());\n if (!file.exists()) {\n Uri remoteUri = new Uri.Builder()\n .scheme(\"https\")\n .authority(\"my-image-site\")\n .appendPath(uri.getPath())\n .build();\n File cacheFile = Glide.with(context)\n .asFile()\n .load(remoteUri)\n .submit()\n .get(DOWNLOAD_TIMEOUT_SECONDS, TimeUnit.SECONDS);\n\n cacheFile.renameTo(file);\n file = cacheFile;\n }\n return ParcelFileDescriptor.open(file, ParcelFileDescriptor.MODE_READ_ONLY);\n }\n\n| **Note:** The content URI should be quickly constructed and sent to Android Auto and AAOS, as demonstrated in the previous example. This is true even when the file isn't downloaded. Android Auto and AAOS show a loading UI for the images when waiting for the content provider to respond. Consider optimizing your app to quickly fetch images and to minimize the time needed to load the UI. Consider preloading and caching images."]]