Android get file extension 取得文件的副檔名

筆記用途

    // 取得文件的副檔名
    private String getFileExtension(Uri uri) {
        ContentResolver contentResolver = getContentResolver();
        MimeTypeMap mimeTypeMap = MimeTypeMap.getSingleton();
        return mimeTypeMap.getExtensionFromMimeType(contentResolver.getType(uri));
    }

Done.