How to pass argument to Context in android -


i new android , times application works fine if pass

if use, 

this context // gets error

if use, 

classname.this context // gets error         android.view.windowmanager$badtokenexception:    unable add window -- token    android.app.localactivitymanager$localactivityrecord@40537450 not valid; activity running?

if use, 

getapplicationcontext()  android.view.windowmanager$badtokenexception:  unable add window -- token null not application

if use, 

classname.this.getparent()

i confused when use what.

please explain


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