Sending mail from Android application

Here is the code sample to add sending mail from Android activity. Before going to implement this feature, need to follow below steps.
- need to add INTERNET permission in Manifest.xml file.
- download and add the below library jar files in libs folder.
- fill the content i.e mentioned with < >.

https://drive.google.com/file/d/1L488o5wIDQE-X9ajq2EDpp7asjmjd3fp/view?usp=sharing