viewPdf method
Implementation
@override
Future<String> viewPdf(String path, String title, String grade, String lang) async {
return await methodChannel.invokeMethod('viewPdf', {'path':path,'title':title, 'grade':grade, 'lang':lang});
}
@override
Future<String> viewPdf(String path, String title, String grade, String lang) async {
return await methodChannel.invokeMethod('viewPdf', {'path':path,'title':title, 'grade':grade, 'lang':lang});
}