我将文件添加到Documents/MyExcelsFolder
通过使用ContentResolver.insert
然后还将新文件添加到Documents/MyExcelsFolder
另一个应用程序的文件夹(例如文件管理器)
然后我尝试从以下位置获取所有文件MyExcelsFolder
folder
fun getAppFiles(context: Context): List<AppFile> {
val appFiles = mutableListOf<AppFile>()
val contentResolver = context.contentResolver
val columns = mutableListOf(
MediaStore.Images.Media._ID,
MediaStore.Images.Media.DATA,
MediaStore.Images.Media.DATE_ADDED,
MediaStore.Images.Media.DISPLAY_NAME,
MediaStore.Images.Media.MIME_TYPE
).apply {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
add(
MediaStore.MediaColumns.RELATIVE_PATH
)
}
}.toTypedArray()
val extensions = listOf("xls", "xlsx")
val mimes = extensions.map { MimeTypeMap.getSingleton().getMimeTypeFromExtension(it) }
val selection = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
"${MediaStore.MediaColumns.RELATIVE_PATH} LIKE ?"
} else {
"${MediaStore.Images.Media.DATA} LIKE ?"
}
val selectionArgs = arrayOf(
"%${Environment.DIRECTORY_DOCUMENTS}/MyExcelsFolder%"
)
contentResolver.query(
MediaStore.Files.getContentUri("external"),
columns,
selection,
selectionArgs,
MediaStore.Files.FileColumns.DATE_ADDED + " DESC"
)?.use { cursor ->
while (cursor.moveToNext()) {
val pathColumnIndex = cursor.getColumnIndex(MediaStore.Images.Media.DATA)
val mimeColumnIndex = cursor.getColumnIndex(MediaStore.Images.Media.MIME_TYPE)
val filePath = cursor.getString(pathColumnIndex)
val mimeType = cursor.getString(mimeColumnIndex)
if (mimeType != null && mimes.contains(mimeType)) {
// handle cursor
appFiles.add(cursor.toAppFile())
} else {
// need to check extension, because the Mime Type is null
val extension = File(filePath).extension
if (extensions.contains(extension)) {
// handle cursor
appFiles.add(cursor.toAppFile())
}
}
}
}
return appFiles
}
fun Cursor.toAppFile(): AppFile {
val cursor = this
val idColumnIndex = cursor.getColumnIndex(MediaStore.Images.ImageColumns._ID)
val nameColumnIndex = cursor.getColumnIndex(MediaStore.Images.Media.DISPLAY_NAME)
val mimeColumnIndex = cursor.getColumnIndex(MediaStore.Images.Media.MIME_TYPE)
val pathColumnIndex = cursor.getColumnIndex(MediaStore.Images.Media.DATA)
val id = cursor.getLong(idColumnIndex)
val uri = ContentUris.withAppendedId(MediaStore.Files.getContentUri("external"), id)
val fileDisplayName = cursor.getString(nameColumnIndex)
val filePath = cursor.getString(pathColumnIndex)
var mimeType = cursor.getString(mimeColumnIndex)
val relativePath = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
cursor.getString(cursor.getColumnIndex(MediaStore.MediaColumns.RELATIVE_PATH))
} else {
null
}
var type = MimeTypeMap.getSingleton().getExtensionFromMimeType(mimeType)
if (type == null) {
type = File(filePath).extension
mimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension(type)
}
return AppFile(
id = id,
uri = uri,
absolutePath = filePath,
name = fileDisplayName,
mimeType = mimeType,
extension = type,
relativePath = relativePath
)
}
结果只有来自的文件ContentResolver
添加者insert
命令,并且 FileManager 没有复制任何文件。如何查看所有文件cursor
?
操作系统:Android 10 (Q)(API 级别 29)
目标 API 版本:api 29