How to open the SD card directory to select a file with Flutter?
As @anmol.majhail mentioned in a comment earlier, use the flutter_document_picker plugin:
final String pptPath = await FlutterDocumentPicker.openDocument( params: FlutterDocumentPickerParams( allowedFileExtensions: ['ppt'], allowedMimeType: 'application/vnd.ms-powerpoint', allowedUtiTypes: ['com.microsoft.powerpoint.ppt'], ));Once you have the file path, use the android_intent plugin to open it in a viewer app such as WPS Office:
if (platform.isAndroid) { final AndroidIntent intent = AndroidIntent( action: 'action_view', data: Uri.file(pptPath).toString(), arguments: {}, package: 'cn.wps.moffice_eng', // optional ); await intent.launch();}