我在我的应用程序中使用 MediaStyle 通知。在 Android 11 之前，它一直工作正常。在 Android 11 上，它会导致 Android UI 崩溃（不仅仅是应用程序，还会崩溃 Android 的 UI）。
应用程序上的logcat没有错误，但Android本身有错误。
fun buildNotificationAsync(sessionToken: MediaSessionCompat.Token): Deferred<Notification> = GlobalScope.async {
if (shouldCreateNowPlayingChannel()) {
createNowPlayingChannel()
}
val controller = MediaControllerCompat(context, sessionToken)
val description = controller.metadata.description
val playbackState = controller.playbackState
val builder = NotificationCompat.Builder(context, NOW_PLAYING_CHANNEL)
// Only add actions for skip back, play/pause, skip forward, based on what's enabled.
var playPauseIndex = 0
if (playbackState.isSkipToPreviousEnabled) {
builder.addAction(skipToPreviousAction)
++playPauseIndex
}
if (playbackState.isRewindEnabled) {
builder.addAction(rewindAction)
++playPauseIndex
}
if (playbackState.isPlaying) {
builder.addAction(pauseAction)
} else if (playbackState.isPlayEnabled) {
builder.addAction(playAction)
}
if (playbackState.isFastForwardEnabled) {
builder.addAction(fastForwardAction)
}
if (playbackState.isSkipToNextEnabled) {
builder.addAction(skipToNextAction)
}
val isHuaweiLollipop = (Build.VERSION.SDK_INT == Build.VERSION_CODES.LOLLIPOP_MR1 ||
Build.VERSION.SDK_INT == Build.VERSION_CODES.LOLLIPOP) &&
Build.MANUFACTURER.toLowerCase(Locale.getDefault()).contains("huawei")
if (!isHuaweiLollipop) {
val mediaStyle = MediaStyle()
.setCancelButtonIntent(stopPendingIntent)
.setMediaSession(sessionToken)
.setShowActionsInCompactView(playPauseIndex)
.setShowCancelButton(true)
builder.setStyle(mediaStyle)
}
description.iconUri?.let { uri ->
val largeIcon = CoverCache.getInstance().fetchLargeIfNecessary(context, uri)
largeIcon?.let { icon -> builder.setLargeIcon(icon) }
}
return@async builder.setContentIntent(controller.sessionActivity)
.setContentText(description.subtitle)
.setContentTitle(description.title)
.setDeleteIntent(stopPendingIntent)
.setOnlyAlertOnce(true)
.setSmallIcon(R.drawable.ic_stat)
.setVisibility(NotificationCompat.VISIBILITY_PUBLIC)
.build()
}
我看到这个异常，我认为是相关的：
AndroidRuntime E FATAL EXCEPTION: SysUiBg
E Process: com.android.systemui, PID: 26311
E java.lang.SecurityException: Permission Denial: opening provider androidx.core.content.FileProvider from ProcessRecord{410d665 26311:com.android.systemui/u0a141} (pid=26311, uid=10141) that is not exported from UID 10151
E at android.os.Parcel.createExceptionOrNull(Parcel.java:2373)
E at android.os.Parcel.createException(Parcel.java:2357)
E at android.os.Parcel.readException(Parcel.java:2340)
E at android.os.Parcel.readException(Parcel.java:2282)
E at android.app.IActivityManager$Stub$Proxy.getContentProvider(IActivityManager.java:5702)
E at android.app.ActivityThread.acquireProvider(ActivityThread.java:6813)
E at android.app.ContextImpl$ApplicationContentResolver.acquireUnstableProvider(ContextImpl.java:2930)
E at android.content.ContentResolver.acquireUnstableProvider(ContentResolver.java:2481)
E at android.content.ContentResolver.openTypedAssetFileDescriptor(ContentResolver.java:1967)
E at android.content.ContentResolver.openTypedAssetFileDescriptor(ContentResolver.java:1921)
E at android.graphics.ImageDecoder$ContentResolverSource.createImageDecoder(ImageDecoder.java:274)
E at android.graphics.ImageDecoder.decodeBitmapImpl(ImageDecoder.java:1862)
E at android.graphics.ImageDecoder.decodeBitmap(ImageDecoder.java:1855)
E at com.android.systemui.media.MediaDataManager.loadBitmapFromUri(MediaDataManager.kt:462)
E at com.android.systemui.media.MediaDataManager.loadBitmapFromUri(MediaDataManager.kt:433)
E at com.android.systemui.media.MediaDataManager.loadMediaDataInBg(MediaDataManager.kt:331)
E at com.android.systemui.media.MediaDataManager.access$loadMediaDataInBg(MediaDataManager.kt:89)
E at com.android.systemui.media.MediaDataManager$loadMediaData$1.run(MediaDataManager.kt:241)
E at android.os.Handler.handleCallback(Handler.java:938)
E at android.os.Handler.dispatchMessage(Handler.java:99)
E at android.os.Looper.loop(Looper.java:223)
E at android.os.HandlerThread.run(HandlerThread.java:67)
E Caused by: android.os.RemoteException: Remote stack trace:
E at com.android.server.am.ActivityManagerService.getContentProviderImpl(ActivityManagerService.java:7155)
E at com.android.server.am.ActivityManagerService.getContentProvider(ActivityManagerService.java:7594)
E at android.app.IActivityManager$Stub.onTransact(IActivityManager.java:2381)
E at com.android.server.am.ActivityManagerService.onTransact(ActivityManagerService.java:2883)
E at android.os.Binder.execTransactInternal(Binder.java:1159)
如果我删除设置小图标的构建器行，它可以正常工作（但这使得通知只是一个没有媒体样式的普通通知）。您会注意到例外是缺乏从文件提供者获取某些内容的权限，但通知中没有任何内容使用类似的内容。
val builder = MediaMetadataCompat.Builder()
.putString(MediaMetadataCompat.METADATA_KEY_TITLE, doc.title)
.putString(MediaMetadataCompat.METADATA_KEY_AUTHOR, doc.author ?: "Unknown")
.putString(MediaMetadataCompat.METADATA_KEY_MEDIA_ID, doc.documentId)
.putString(MediaMetadataCompat.METADATA_KEY_ALBUM, folders.firstOrNull { it.folderId == doc.folderId }?.folderName)
.putString(MediaMetadataCompat.METADATA_KEY_GENRE, sourceType?.name ?: "Unknown") // We don't have Genre info, we'll use for the sourceType
.putLong(METADATA_KEY_UAMP_FLAGS, MediaBrowserCompat.MediaItem.FLAG_PLAYABLE.toLong())
if (originalDocumentType != null) {
// We don't have a disc no, so
builder.putLong(MediaMetadataCompat.METADATA_KEY_DISC_NUMBER, originalDocumentType.ordinal.toLong())
}
// we'll use it doc type.
if (icon != null) {
builder.putString(MediaMetadataCompat.METADATA_KEY_DISPLAY_ICON_URI, icon.toString())
}
最后一行设置 Icon uri。那需要许可。
将其添加到该行的正上方
context.grantUriPermission("com.android.systemui", icon, Intent.FLAG_GRANT_READ_URI_PERMISSION)
现在应用程序可以正常运行了。但由于缺少该权限而导致 Android UI 崩溃的事实仍然是一个错误。我希望无法显示图标，甚至使应用程序崩溃，但肯定不会使 Android 本身崩溃。
非常有效，谢谢！似乎特定于 Android 11。context.grantUriPermission( "com.android.systemui", it.toUri(), Intent.FLAG_GRANT_READ_URI_PERMISSION)
我也必须将其添加到我正在开发的音频应用程序的媒体映射器中。