创建活动时，运行Backgroung线程

I am new to Android Programming. I am making an App which requires "OnlineMode" as well as "OfflineMode". I researched a lot about the topic and first step is to check for internet connectivity continously. Just like big apps like "WhatsApp" "Hike" etc use. Now I tried to create a thread which will run in background , it got created but not being able to produce the output the results. I have tried various methods. Here's what i wantI am new to Android Programming. I am making an