Close Android Application

Question

Please suggest how I may close my whole Android Application with one line code

User · Answer

The answer depends on what you mean by  close app   In android s terms its either about an  activity   or a group of activities in a temporal ancestral order called  task    End activity  just call finish    End task    clear activity task-stack navigate to root activity then call finish on it    This will end the entire  task

User · Answer

That s one of most useless desires of beginner Android developers  and unfortunately it seems to be very popular  How do you define  close  an Android application  Hide it s user interface  Interrupt background work  Stop handling broadcasts   Android applications are a set of modules  bundled in an  apk and exposed to the system trough AndroidManifest xml  Activities can be arranged and re-arranged trough different task stacks  and finish  -ing or any other navigating away from a single Activity may mean totally different things in different situations  Single application can run inside multiple processes  so killing one process doesn t necessary mean there will be no application code left running  And finally  BroadcastReceivers can be called by the system any time  recreating the needed processes if they are not running   The main thing is that you don t need to stop kill close whatever your app trough a single line of code  Doing so is an indication you missed some important point in Android development  If for some bizarre reason you have to do it  you need to finish   all Activities  stop all Services and disable all BroadcastReceivers declared in AndroidManifest xml  That s not a single line of code  and maybe launching the Activity that uninstalls your own application will do the job better

User · Answer

android os Process killProcess android os Process myPid       This code kill the process from OS Using this code disturb the OS  So I would recommend you to use the below code  this finish    Intent intent   new Intent Intent ACTION MAIN   intent addCategory Intent CATEGORY HOME   intent setFlags Intent FLAG ACTIVITY NEW TASK   startActivity intent

User · Answer

I don t think you can do it in one line of code  Try opening your activities with startActivityForResult  As the result you can pass something like a CLOSE FLAG  which will inform your parent activity that its child activity has finished   That said  you should probably read this answer

User · Answer

Before doing so please read this other question too   android os Process killProcess android os Process myPid

User · Answer

not a one-line-code solution  but pretty easy   sub-class Activity  then override and add finish   to onPause   method  this way  activity will be gone once it enters background  therefore the app won t keep a stack of activities  you can finish   the current activity and the app is gone

User · Answer

You could close your Android Application by calling System exit 0

User · Answer

If you close the main Activity using Activity finish    I think it will close all the activities  MAybe you can override the default function  and implement it in a static way  I m not sure

User · Answer

Yes - Why  then how sort of    Short answer    System exit 0     This nicely and cleanly terminates the whole java machine which is dedicated to running the app  However  you should do it from the main activity  otherwise android may restart your app automatically   Tested this on Android 7 0   Details and explanation of why this is a good question and a programmer may have a very legitimate reason to terminate their app this way   I really don t see the gain in speaking harshly to someone who s looking for a way to terminate their app    Good is a friendly reminder to beginners that on Android you don t have to worry about closing your app -- but some people actually do want to terminate their app even though they know that they don t have to -- and their question of how to do so is a legitimate  question with a valid answer   Perhaps many folks live in an ideal world and don t realize that there s a real world where real people are trying to solve real problems    The fact is that even with android  it is still a computer and that computer is still running code  and that it is perfectly understandable why someone may wish to truly exit their  app   i e  all of the activities and resources belonging to their app    It is true that the developers at Google designed a system where they believed nobody would ever need to exit their app  And maybe 99  of the time they are right   But one of the amazing things about allowing millions of programmers to write code for a platform is that some of them will try to push the platform to its limits in order to do amazing things  -- Including things that the Android Developers never even dreamed of   There is another need for being able to close a program  and that is for troubleshooting purposes  That is what brought me to this thread  I m just learning how to utilize the audio input feature to do realtime DSP    Now don t forget that I said the following  I well know that when I have everything done right  I won t need to kill my app to reset the audio interface    BUT  Remember  perfect apps don t start out as perfect apps  They start out as just barely working apps and grow to become proper ideal apps   So what I found was that my little audio oscilloscope test app worked great until I pressed the android  Home button  When I then re-launched my oscilloscope app  there was no audio coming in anymore   At first I would go into  Settings- gt Applications- gt Manage Applications- gt AppName- gt Force Stop    Note that if the actual linux process is not running  the Force Stop button will be disabled  If the button is enabled  then the Linux process is still running    Then I could re-launch my app and it worked again   At first  I was just using divide by zero to crash it - and that worked great  But I decided to look for a better way - which landed me here   So here s the ways I tried and what I found out   Background  Android runs on Linux   Linux has processes and process IDs  PIDs  just like Windows does  only better  To see what processes are running on your android  with it connected into the USB and everything  run adb shell top and you will get an updating list of all the processes running in the linux under the android   If you have linux on your PC as well  you can type   adb shell top   egrep -i   User PID MyFirstApp   --line-buffered   to get just the results for your app named MyFirstApp  You can see how many Linux Processes are running under that name and how much of the cpu power they are consuming    Like the task manager   process list in Windows   Or if you want to see just the running apps   adb shell top   egrep -i   User PID app    --line-buffered   You can also kill any app on your device by running  adb shell kill 12345  where 12345 is it s PID number   From what I can tell  each single-threaded app just uses a single Linux process    So what I found out was that  of course  if I just activate the android Home option  my app continues to run  And if I use the Activity finish    it still leaves the process running  Divide by zero definitely terminates the linux process that is running  Killing the PID from within the app seems the nicest so far that I ve found  at least for debugging purposes   I initially solved my need to kill my app by adding a button that would cause a divide by zero  like this in my MainActivity java   public void exit View view        int x      x 1 0      Then in my layout XML file section for that button I just set the android onClick  exit    Of course divide by zero is messy because it always displays the  This application stopped     or whatever   So then I tried the finish  like this   public void exit View view        finish        And that made the app disappear from the screen but it was still running in the background   Then I tried   public void exit View view          android os Process killProcess android os Process myPid         So far  this is the best solution I ve tried   UPDATE  This is the same as above in that it instantly terminates the Linux process and all threads for the app   public void exit View view          System exit 0       It instantly does a nice full exit of the thread in question without telling the user that the app crashed   All memory used by the app will be freed   Note  Actually  you can set parameters in your manifest file to cause different threads to run in different Linux processes  so it gets more complicated then    At least for quick and dirty testing  if you absolutely need to know that the thread is actually fully exited  the kill process does it nicely  However  if you are running multiple threads you may have to kill each of those  probably from within each thread   EDIT  Here is a great link to read on the topic  http   developer android com guide components fundamentals html It explains how each app runs in its own virtual machine  and each virtual machine runs under its own user ID   Here s another great link that explains how  unless specified otherwise in manifest  an app and all of its threads runs in a single Linux process  http   developer android com guide components processes-and-threads html   So as a general rule  an app really is a program running on the computer and the app really can be fully killed  removing all resources from memory instantly    By instantly I mean ASAP -- not later whenever the ram is needed    PS  Ever wonder why you go to answer your android phone or launch your favorite app and it freezes for a second  Ever reboot because you get tired of it  That s probably because of all the apps you ran in the last week and thought you quit but are still hanging around using memory  Phone kills them when it needs more memory  causing a delay before whatever action you wanted to do   Update for Android 4 Gingerbread   Same thing as above applies  except even when an app exits or crashes and its whole java virtual machine process dies  it still shows up as running in the app manager  and you still have the  force close  option or whatever it is  4 0 must have an independent list of apps it thinks is running rather than actually checking to see if an app is really even running

User · Answer

As per my knowledge  finish function close the current displayed screen only   Refer this example  where see the answer given by  plusminus    it will sure help you to close your application

User · Answer

just call the finish   in the method you would like to end the activity in  for example when you use the onCreate   method  in the end of the method  just add finish   and you will see the activity ends as soon as it is created

User · Answer

You could finish your Activity by calling Activity finish    However take care of the Android Activity life-cycle

[android] Close Android Application

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