How to use onResume

Question

Can anyone give me an example that uses onResume   in Android   Also  if I want to restart the activity at the end of the execution of another  which method is executed   onCreate   or onResume     And if I want to update data  how do I put it in onResume

User · Answer

Re-review the Android Activity Lifecycle reference. There is a nice picture, and the table showing what methods get called. reference Link google

https://developer.android.com/reference/android/app/Activity.html

User · Answer

Any Activity that restarts has its onResume   method executed first   To use this method  do this    Override public void onResume        super onResume           put your code here

User · Answer

KOTLIN   Any Activity that restarts has its onResume   method executed first   To use this method  do this   override fun onResume             super onResume              your code here

User · Answer

After an activity started  restarted  onRestart   happens before onStart     or paused  onPause     onResume   called  When the activity is in the state of onResume    the activity is ready to be used by the app user   I have studied the activity lifecycle a little bit  and here s my understanding of this topic  If you want to restart the activity  A  at the end of the execution of another  there could be a few different cases    The other activity  B  has been paused and or stopped or destroyed  and the activity A possibly had been paused  onPause     in this case  activity A will call onResume   The activity B has been paused and or stopped or destroyed  the activity A possibly had been stopped  onStop    due to memory thing  in this case  activity A will call onRestart   first  onStart   second  then onResume   The activity B has been paused and or stopped or destroyed  the activity A has been destroyed  the programmer can call onStart   manually to start the activity first  then onResume   because when an activity is in the destroyed status the activity has not started  and this happens before the activity being completely removed  If the activity is removed  the activity needs to be created again  Manually calling onStart   I think it s because if the activity not started and it is created  onStart   will be called after onCreate      If you want to update data  make a data update function and put the function inside the onResume    Or put a loadData function inside onResume    It s better to understand the lifecycle with the help of the Activity lifecycle diagram

User · Answer

Most of the previous answers do a good job explaining how  why  and when to use onResume   but I would like to add something about re-creating your Activity      I want to know if I want to restart the activity at the end of exectuion of an other what method is executed onCreate   or onResume      The answer is onCreate   However  when deciding to actually re-create it  you should ask yourself how much of the Activity needs to be re-created  If it is data in an adapter  say for a list  then you can call notifyDataChanged   on the adapter to repopulate the adapter and not have to redraw everything   Also  if you just need to update certain views but not all then it may be more efficient to call invalidate   on the view s  that need updated  This will only redraw those views and possibly allow your application to run more smoothly  I hope this can help you

User · Answer

The best way to understand would be to have all the LifeCycle methods overridden in your activity and placing a breakpoint if checking in emulator  or a Log in each one of them  You ll get to know which one gets called when     Just as an spoiler  onCreate   gets called first  then if you paused the activity by either going to home screen or by launching another activity  onPause   gets called  If the OS destroys the activity in the meantime  onDestroy   gets called  If you resume the app and the app already got destroyed  onCreate   will get called  or else onResume   will get called     Edit  I forgot about onStop    it gets called before onDestroy     Do the exercise I mentioned and you ll be having a better understanding

User · Answer

Restarting the app will call OnCreate     Continuing the app when it is paused will call OnResume    From the official docs at https   developer android com reference android app Activity html ActivityLifecycle here s a diagram of the activity lifecycle

User · Answer

onResume   is one of the methods called throughout the activity lifecycle  onResume   is the counterpart to onPause   which is called anytime an activity is hidden from view  e g  if you start a new activity that hides it  onResume   is called when the activity that was hidden comes back to view on the screen    You re question asks abou what method is used to restart an activity  onCreate   is called when the activity is first created  In practice  most activities persist in the background through a series of onPause   and onResume   calls  An activity is only really  restarted  by onRestart   if it is first fully stopped by calling onStop   and then brought back to life   Thus if you are not actually stopping activities with onStop   it is most likley you will be using onResume      Read the android doc in the above link to get a better understanding of the relationship between the different lifestyle methods  Regardless of which lifecycle method you end up using the general format is the same  You must override the standard method and include your code  i e  what you want the activity to do at that point  in the commented section     Override public void onResume       will be executed onResume

[android] How to use onResume()?

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