Android 如何获取具有 Uri 的文件的 MIME 类型？
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How I can get the mime type of a file having its Uri?
提问by Brais Gabin
I have a List of Uris obtained with the Gallery and the Camera. These Uris are like this: content://media/external/images/media/94. How I can get its mime type?
我有一个通过画廊和相机获得的 Uris 列表。这些 Uris 是这样的：content://media/external/images/media/94. 我怎样才能得到它的 mime 类型？
回答by Kartik Domadiya
You can try
你可以试试
ContentResolver cR = context.getContentResolver();
MimeTypeMap mime = MimeTypeMap.getSingleton();
String type = mime.getExtensionFromMimeType(cR.getType(uri));
Edit :
编辑 ：
mime.getExtensionFromMimeType(cR.getType(uri))
returns -> "jpeg"
返回 -> "jpeg"
cR.getType(uri);
returns "image/jpeg" that is the expected value.
返回“图像/jpeg”这是预期值。
回答by Aaron
This method returns the extension of the file (jpg, png, pdf, epub etc..).
此方法返回文件的扩展名（jpg、png、pdf、epub 等）。
public static String getMimeType(Context context, Uri uri) {
String extension;
//Check uri format to avoid null
if (uri.getScheme().equals(ContentResolver.SCHEME_CONTENT)) {
//If scheme is a content
final MimeTypeMap mime = MimeTypeMap.getSingleton();
extension = mime.getExtensionFromMimeType(context.getContentResolver().getType(uri));
} else {
//If scheme is a File
//This will replace white spaces with %20 and also other special characters. This will avoid returning null values on file name with spaces and special characters.
extension = MimeTypeMap.getFileExtensionFromUrl(Uri.fromFile(new File(uri.getPath())).toString());
}
return extension;
}
回答by Bhavesh Rangani
for ContentUri.
为ContentUri。
ContentResolver cr = context.getContentResolver();
mimeType = cr.getType(contentUri);
for FileUri.
为FileUri。
String fileExtension = MimeTypeMap.getFileExtensionFromUrl(fileUri
.toString());
mimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension(
fileExtension.toLowerCase());
for Both, works for Contentas well as File.
在这两方面，工程Content以及File。
public String getMimeType(Context context, Uri uri) {
String mimeType = null;
if (ContentResolver.SCHEME_CONTENT.equals(uri.getScheme())) {
ContentResolver cr = context.getContentResolver();
mimeType = cr.getType(uri);
} else {
String fileExtension = MimeTypeMap.getFileExtensionFromUrl(uri
.toString());
mimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension(
fileExtension.toLowerCase());
}
return mimeType;
}
回答by Mohamed Ibrahim
Instead of this:
取而代之的是：
String type = mime.getExtensionFromMimeType(cR.getType(uri));
Do this:
做这个：
String type = cR.getType(uri);
And you will get this: image/jpeg.
你会得到这个：image/jpeg。
