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| public class FileUtils { | |
| /** | |
| * @return The MIME type for the given file. | |
| */ | |
| public static String getMimeType(File file) { | |
| String extension = getExtension(file.getName()).toLowerCase(); | |
| if (!TextUtils.isEmpty(extension) && extension.length() > 1) | |
| return MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension.substring(1)); | |
| return "application/octet-stream"; | |
| } | |
| /** | |
| * Gets the extension of a file name, like ".png" or ".jpg". | |
| * | |
| * @return Extension including the dot("."); "" if there is no extension or fileName is null. | |
| */ | |
| @NonNull | |
| public static String getExtension(String fileName) { | |
| if (fileName == null) { | |
| return ""; | |
| } | |
| int dot = fileName.lastIndexOf("."); | |
| if (dot >= 0) { | |
| return fileName.substring(dot); | |
| } else { | |
| // No extension. | |
| return ""; | |
| } | |
| } | |
| } |
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| override fun openFile(path: String) { | |
| val newIntent = Intent(Intent.ACTION_VIEW) | |
| val file = File(path) | |
| val mimeType = FileUtils.getMimeType(file) | |
| if (Build.VERSION.SDK_INT < 24) { | |
| newIntent.setDataAndType(Uri.fromFile(file), mimeType) | |
| } else newIntent.setDataAndType(Storage.getUriFromFile(file), mimeType) | |
| newIntent.flags = Intent.FLAG_ACTIVITY_NEW_TASK | |
| if (Build.VERSION.SDK_INT >= 24) { | |
| newIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION) | |
| } | |
| if (newIntent.resolveActivity(requireContext().packageManager) != null) activity!!.startActivity(newIntent) | |
| else Toast.makeText(activity, R.string.no_handler, Toast.LENGTH_LONG).show() | |
| } |
There is no "extension" method in java.io.File package in android SDK 28.
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Returns the extension of file (not including the dot), or an empty string if it doesn't have one
val fileExtension : ((path: String) -> String) = { File(it).extension }Returns the extension of file (including the dot), or an empty string if it doesn't have one
val fileExtensionWithDot: ((path: String) -> (String)) = { File(it.extension).let { ext -> if (ext.isEmpty() "" else ".$ext") } }