Android Activity Life Cycle

       An Activity is usually a single screen that the users sees on the device at a one time. Any      application that has been developed by anyone it typically contains multiple activities. 

* Most management of the life cycle is done automatically by the system via the activity Stack .
* Activity manager is responsible for creating , destroying and managing activities.

In Activity Life Cycle we are having following methods: 
1. onCreate() 2. onStart() 3. onRestart() 4. onResume() 5. onPause() 6. onStop() 7. onDestroy()

1.The activity first time loads the methods are called as below: 
   onCreate() onStart() onResume()

2.When try to click back button or finish the activity the following methods are called: 
   onPause() onStop() onDestroy()

3.When you click on home button the activity goes to background and below methods are called: 
   onPause() onStop()

4.After hitting home button again if your opening the previous activity which is in background the following methods are called:
   onRestart() onStart() onResume().

Firsttime Launch:

com.example.activitylifecycle E/onCreate ------:   MainActivity: onCreate()

com.example.activitylifecycle E/onStart ------:      MainActivity: onStart()

com.example.activitylifecycle E/onResume ------: MainActivity: onResume()

Start AnotherActivity:

com.example.activitylifecycle E/onPause ------: MainActivity: onPause()

com.example.activitylifecycle E/onCreate ------:    AnotherActivity: onCreate()

com.example.activitylifecycle E/onStart ------:       AnotherActivity: onStart()

com.example.activitylifecycle E/onResume ------:  AnotherActivity: onResume()

com.example.activitylifecycle E/onStop ------:    MainActivity: onStop()

Press BackButton:

com.example.activitylifecycle E/onPause ------AnotherActivity: onPause()

com.example.activitylifecycle E/onRestart ------: MainActivity: onRestart()

com.example.activitylifecycle E/onStart ------:     MainActivity: onStart()

com.example.activitylifecycle E/onResume ------:MainActivity: onResume()

com.example.activitylifecycle E/onStop ------: AnotherActivity: onStop()

com.example.activitylifecycle E/onDestroy ----AnotherActivity: onDestroy()

Complete back mainactivity:

activitylifecycle E/onPause ------:                         MainActivity: onPause()

com.example.activitylifecycle E/onStop ------:     MainActivity: onStop()

com.example.activitylifecycle E/onDestroy ------:MainActivity: onDestroy()


Home  Button:
E/onPause ------: MainActivity: onPause()

com.example.activitylifecycle E/onStop ------: MainActivity: onStop()