Android Interview Tips and Playground

Activity Life Cycle

which life cycle methods will get called in every situation?

• Launch First Activity

• Launch Second Activity

• Press Back Button from First Activity

• Press Back Button from Second Activity

• Put App In Background for First Activity option

• Resume App In Foreground for First Activity option

• Kill The App when First Activity on Foreground

• Rotate Screen for First Activity Option

• when onDestroy() get called without call onPause() and on Stop()

• how many times onCreate() is called during Activity is opened

• Answer : check this image

Activity State Change

• When onSavedInstance(Bundle savedInstance) is called?

• Does onSavedInstance method is called when i call finis() method in activity?

• Does onSavedInstance method is called when i press Back Button?

• Does SavedInstance save heavy objects (large data set) or primitives data only?

• which methods can you use to restore savedInstance object ?

• When system call onRestoreInstanceState method?

• what will happen when add Edit text without id and rotate the screen?

• Answer : check this link

Fragment

• what is fragment?

• what are the ways to add fragment in your activity?

• can you replace static fragment or not?

• how to create static fragment?

• how to create dynamic fragment?

• describe life cycle for fragment?

• describe the fragment lifecycle methods that will be called when the activity with the fragment start?

• describe the fragment lifecycle methods that will be called when user press back button?

• which one is called first, onStart for fragment or the activity?

• which one is called first, onResume for fragment or the activity?

• which one is called first, onStop for fragment or the activity?

• which one is called first, onPause for fragment or the activity?

• what will happen if you press back button for activity with fragment without adding fragment to back stack?

• what will happen if you press back button for activity with fragment with adding fragment to back stack?

• does fragment have back stack like activity?

• what is the difference between back stack for fragment and back stack for activity?

• what is the back stack count if you try to add three fragments without using addToBackStack()method?

• what is the meaning of addToBackStack(null)?

• what is difference between add and replace in back stack transaction?

• does back stack is stack of fragments or transaction?

• what will be tha back stack count if you add three fragments and then press back stack 3 times?

• what is the difference between popStack method and remove for fragment back stack?

• Answer : check this link