Android :: Switching Activities Back / Need To Make GridView Again?

I'm starting on Android and got a beginner question on switching between multiple activities. I understand i can go between two activities by invoking an intent and then returning with setResult(). What I want to know is how to jump between multiple activities. Specifically I want to learn about the process life-cycle. I understand how every activity is started ar onCreated(), but I'm not sure how to implement onResume() or onRestart() when I want to come back. So basically I have 3 activities: Activity1, Activity2 and Anctivity3. I start with Activity1 and then invoke Activity2 with an Intent, and Activity2 invokes Activity3. Using buttons. Now I want to come back to Activity1 from Activity3. I do the same thing here too. Make an Intent and call startActivity(Activity1_Intent). But it gives a runtime error.I think I need to implement OnResume() or onRestart(), but I'm not sure how to do this. In onCreate() I make a gridView, so when I come back, do I need to make that gridView again? If anybody could give a small explanation of refer to a tutorial it would be great.