SendKeys() not working in ionic android app

I am having a android app which is developed ionic framework, i have a .apk file for the app.
I am in login page , I am able to tap the sign in page, but not able to send keys to username and password field.
Similarly after logging in, I am not able to inspect any element inside the page.
can anyone guide how to proceed automation for the app , or the issues i am facing currently is due to Ionic framework.

maven repository of java client used