Android Q Download文件存储

11 以上存放 Download 目录中只能通过uri 进行读取且只能APP 安装后存放的文件才有访问权限
APP 卸载之后数据库中权限会被移除无法再通过文件名称进行查询
这边通过比较描述字段进行判断是否下载过文件
11 以上APP进行卸载后在安装下载会出现重复文件

不知是否还有其他解决方案

复制文件至Download目录中

fun copyFileToDownload(context:Context, oldPath:String, targetDirName:String) {if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {copyFileToDownloadDir(context, oldPath, targetDirName)} else {var newPath = FileUtils.getExternalDownloadsPath() + File.separator +targetDirName + File.separator + File(oldPath).namevar filePara = File(FileUtils.getExternalDownloadsPath() + File.separator + targetDirName)if (filePara.exists()) {filePara.mkdirs()}FileUtils.copyFile(oldPath, newPath)}
}@RequiresApi(Build.VERSION_CODES.Q)
fun copyFileToDownloadDir(context:Context, oldPath:String, targetDirName:String):Uri? {try {val oldFile = File(oldPath)//设置目标文件的信息val values = ContentValues()values.put(MediaStore.Images.Media.DESCRIPTION, oldFile.name)values.put(MediaStore.Files.FileColumns.DISPLAY_NAME, oldFile.name)values.put(MediaStore.Files.FileColumns.TITLE, oldFile.name)values.put(MediaStore.Files.FileColumns.MIME_TYPE, oldPath.getMimeType())val relativePath = Environment.DIRECTORY_DOWNLOADS + File.separator + targetDirNamevalues.put(MediaStore.Images.Media.RELATIVE_PATH, relativePath)val downloadUri = MediaStore.Downloads.EXTERNAL_CONTENT_URIval resolver = context.contentResolverval insertUri = resolver.insert(downloadUri, values)if (insertUri != null) {val fos = resolver.openOutputStream(insertUri)if (fos != null) {val fis = FileInputStream(oldFile)fis.copyTo(fos)fis.close()fos.close()return insertUri}}} catch (e:Exception) {e.printStackTrace()}return null
}

通过查询 DESCRIPTION字段判断文件是否存在

   fun findDownloadsFile(context:Context,targetDirName:String, description:String):ArrayList<Uri>? {if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {return findDownloadsUri4Description(context,targetDirName, description)} else {var newPath = FileUtils.getExternalDownloadsPath() + File.separator + targetDirName + File.separator + descriptionvar file = File(newPath)if (file.exists()) {var uri = FileUtils.getFile2Uri(file)var list = ArrayList<Uri>()uri?.let { list.add(it) }return list} else {return null}}}/***  通过描述 字段 查询 下载目录中的文件* @param context Context* @param dirName String?  子目录* @param description String  描述字段* @return ArrayList<Uri>*/@RequiresApi(Build.VERSION_CODES.Q)fun findDownloadsUri4Description(context:Context, dirName:String?, description:String):ArrayList<Uri> {val resultList = ArrayList<Uri>()try {val resolver = context.contentResolverval downloadUri = MediaStore.Downloads.EXTERNAL_CONTENT_URIvar selection:String? = nullvar selectionArgs = mutableListOf<String>()if (dirName != null && dirName.isNotEmpty()) {selection = MediaStore.Files.FileColumns.BUCKET_DISPLAY_NAME + " = ? AND "selectionArgs.add(dirName)}selection = selection + MediaStore.Images.Media.DESCRIPTION + " = ? "selectionArgs.add(description)val resultCursor = resolver?.query(downloadUri, null, selection, selectionArgs.toTypedArray(), null)if (resultCursor != null) {val fileIdIndex = resultCursor.getColumnIndexOrThrow(MediaStore.Files.FileColumns._ID)while (resultCursor.moveToNext()) {val fileId = resultCursor.getLong(fileIdIndex)val pathUri = downloadUri.buildUpon().appendPath("$fileId").build()resultList.add(pathUri)}resultCursor.close()}} catch (e:Exception) {e.printStackTrace()}return resultList}

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