Android Clear the back stack

Question

In Android I have some activities  let s say A  B  C   In A  I use this code to open B   Intent intent   new Intent this  B class   startActivity intent     In B  I use this code to open C   Intent intent   new Intent this  C class   startActivity intent     When the user taps a button in C  I want to go back to A and clear the back stack  close both B and C   So when the user use the back button B and C will not show up  I ve been trying the following   Intent intent   new Intent this  A class   intent setFlags Intent FLAG ACTIVITY CLEAR TOP    startActivity intent     But B and C are still showing up if I use the back button when I m back in activity A  How can I avoid this

User · Answer

You can use this example to call your Activity A from Activity C  Intent loout   new Intent context  LoginActivity class   loout setFlags Intent FLAG ACTIVITY NEW TASK   Intent FLAG ACTIVITY CLEAR TASK   context startActivity loout

User · Answer

Add NO History Flag in the intent   In activity B  start the activity C as below         Intent intent   new Intent this  C class   intent setFlags intent getFlags     Intent FLAG ACTIVITY NO HISTORY    startActivity intent   finish

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This code work for me in kotlin    val intent   Intent this  MainActivity  class java   intent addFlags Intent FLAG ACTIVITY CLEAR TOP or Intent FLAG ACTIVITY CLEAR TASK or Intent FLAG ACTIVITY NEW TASK   startActivity intent   finish

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I found an interesting solution which might help  I did this in my onBackPressed   method   finishAffinity    finish      FinishAffinity removes the connection of the existing activity to its stack  And then finish helps you exit that activity  Which will eventually exit the application

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logout addFlags Intent FLAG ACTIVITY CLEAR TASK                               logout addFlags Intent FLAG ACTIVITY NEW TASK

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Use setFlags   method for clear back side opened all activity close and start yourActvity   Intent intent   new Intent getApplicationContext    yourActivity class   intent setFlags Intent FLAG ACTIVITY NEW TASK   Intent FLAG ACTIVITY CLEAR TASK   startActivity intent

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If your application has minimum sdk version 16 then you can use   finishAffinity    Finish this activity as well as all activities immediately below it in the current task that have the same affinity     This is work for me In Top Payment screen remove all back-stack activits     Override public void onBackPressed              finishAffinity            startActivity new Intent PaymentDoneActivity this Home class             http   developer android com reference android app Activity html finishAffinity 28 29

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Add android launchMode  singleTop  to the activity element in your manifest for Activity A Then use intent addFlags Intent FLAG ACTIVITY CLEAR TOP   and intent addFlags Intent FLAG ACTIVITY NEW TASK  when starting Activity A   This means that when Activity A is launched  all tasks on top of it are cleared so that A is top  A new back stack is created with A at the root  and using singleTop ensures you only ever launch A once  since A is now on top due to     CLEAR TOP

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For future research  try this code   Intent intent   new Intent context  LoginActivity class   intent addFlags Intent FLAG ACTIVITY CLEAR TOP   Intent FLAG ACTIVITY CLEAR TASK   Intent FLAG ACTIVITY NEW TASK   startActivity intent   finish

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Try using  intent addFlags Intent FLAG ACTIVITY SINGLE TOP     and not  intent setFlags Intent FLAG ACTIVITY SINGLE TOP

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Try adding FLAG ACTIVITY NEW TASK as described in the docs for FLAG ACTIVITY CLEAR TOP      This launch mode can also be used to   good effect in conjunction with   FLAG ACTIVITY NEW TASK  if used to   start the root activity of a task  it   will bring any currently running   instance of that task to the   foreground  and then clear it to its   root state  This is especially useful    for example  when launching an   activity from the notification   manager    So your code to launch A would be   Intent intent   new Intent this  A class   intent addFlags Intent FLAG ACTIVITY CLEAR TOP   Intent FLAG ACTIVITY NEW TASK    startActivity intent   CurrentActivity this finish       if the activity running has it s own context      view getContext   finish   for fragments etc

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I tried all solutions and none worked individually for me  My Solution is    Declare Activity A as SingleTop by using  android launchMode  singleTop   in Android manifest   Now add the following flags while launching A from anywhere  It will clear the stack   Intent in   new Intent mContext  A class   in addFlags Intent FLAG ACTIVITY CLEAR TOP   Intent FLAG ACTIVITY NEW TASK   Intent FLAG ACTIVITY CLEAR TASK    startActivity in   finish

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In manifest  android launchMode  singleTask    and  intent addFlags Intent FLAG ACTIVITY CLEAR TOP   startActivity intent

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Intent FLAG ACTIVITY CLEAR TOP will not work in this case  Please use  Intent FLAG ACTIVITY NEW TASK   Intent FLAG ACTIVITY CLEAR TASK   For more detail please check out this documentation

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Use finishAffinity    in task C when starting task A to clear backstack activities

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This bothers me for a long time  Finally I worked it out by doing this   In fragment use   Intent intent   new Intent view getContext    A class   intent addFlags Intent FLAG ACTIVITY CLEAR TOP   Intent FLAG ACTIVITY NEW TASK    startActivity intent     In Activity use add one more intent flag Intent FLAG ACTIVITY CLEAR TASK compared to fragment    Intent intent   new Intent this  MainActivity class   intent addFlags Intent FLAG ACTIVITY CLEAR TOP   Intent FLAG ACTIVITY CLEAR TASK   Intent FLAG ACTIVITY NEW TASK   startActivity intent

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Use finishAffinity   to clear all backstack with existing one   Suppose  Activities A  B and C are in stack  and finishAffinity    is called in Activity C        - Activity B will be finished   removing from stack      - Activity A will be finished   removing from stack      - Activity C will finished   removing from stack

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In kotlin it is almost same like java  Only   symbol is replaced by or text  So  it is written like-  intent addFlags Intent FLAG ACTIVITY CLEAR TASK or Intent FLAG ACTIVITY NEW TASK

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intent addFlags Intent FLAG ACTIVITY NEW TASK   Intent FLAG ACTIVITY CLEAR TASK   startActivity intent

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As per Wakka in Removing an activity from the history stack       Add android noHistory  true  attribute to your  lt activity gt  in the AndroidManifest xml like this        lt activity android name   MyActivity          android noHistory  true  gt       lt  activity gt

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This worked for me with onBackPressed   public void onBackPressed         Intent intent   new Intent ImageUploadActivity this  InputDataActivity class        Intent myIntent   new Intent this  ImageUploadActivity class       myIntent addFlags Intent FLAG ACTIVITY CLEAR TOP   Intent FLAG ACTIVITY CLEAR TASK   Intent FLAG ACTIVITY NEW TASK       startActivity intent      finish

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Intent intent   new Intent this  A class   startActivity intent   finish

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This is how I solved the problem   private boolean clearHistoryBackStack   true    Override public final void finish         super finish         if clearHistoryBackStack          finishAffinity

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In addition to FLAG ACTIVITY CLEAR TOP  you may try adding Intent FLAG ACTIVITY SINGLE TOP as well   intent addFlags Intent FLAG ACTIVITY SINGLE TOP   intent addFlags Intent FLAG ACTIVITY CLEAR TOP

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you wont get any activity pressing back button after that     intent addFlags Intent FLAG ACTIVITY CLEAR TOP   Intent FLAG ACTIVITY CLEAR TASK    Intent FLAG ACTIVITY NEW TASK   startActivity intent   finishAffinity    finish

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What about adding in manifests file for related activity    android noHistory  true    to the activity definition of B and C   They will not be added to the backstack  Not sure if that is what you want

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It sounds to me like you need to start Activity C from Activity B by using startActivityForResult    When you click a button in Activity C  call setResult RESULT OK  and finish   so Activity C is ended  In Activity B  you could have the onActivityResult   respond by also calling finish   on itself  and you d then be taken back to Activity A

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The given code works correctly  I have tried in the Application Life Cycle sample   I haven t got B and C in the back stack after starting activity A with flag  FLAG ACTIVITY CLEAR TOP

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This is a really old answer and i didn t really found a proper solution to it  to the sole purpose of clearing the backStack  i decided to create my own backstack  which is not even a stack tbh  but it doesn t have to be  since we want to clear everything in it anyways   Theres an overhead of handlind the backstack everytime  but it gave me the control i needed     First Declare a public static List of Activities  or fragments  whatever you need    public static ArrayList  lt Activity gt  backStack   new ArrayList lt  gt       And inside all other activity s onCreate method   MainActivity backStack add this     And finally  when you want to clear the backstack  simply call   public static void killBackStack          for  Activity ac   backStack            if  ac    null              ac finish

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Use this code for starting a new Activity and close or destroy all other activity stack or back stack   Intent intent   new Intent this  MainActivity class   intent setFlags Intent FLAG ACTIVITY NEW TASK   Intent FLAG ACTIVITY CLEAR TASK   startActivity intent

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i called activity name this finish   after starting new intent and it worked for me   I tried  FLAG ACTIVITY CLEAR TOP  and  FLAG ACTIVITY NEW TASK    But it won t work for me    I am not suggesting this solution for use but if setting flag won t work for you than you can try this  But still i recommend don t use it

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I found the answers here a little misleading because the code in the original question seems to work fine for me   With A being the root activity  starting it from B or C only with FLAG ACTIVITY CLEAR TOP does remove B and C from the back stack

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Advanced  Reuseable Kotlin   You can set the flag directly using setter method  In Kotlin or is the replacement for the Java bitwise or     intent flags   FLAG ACTIVITY NEW TASK or FLAG ACTIVITY CLEAR TASK   If use this more than once  create an Intent extension function  fun Intent clearStack         flags   Intent FLAG ACTIVITY NEW TASK or Intent FLAG ACTIVITY CLEAR TASK     You can then directly call this function before starting the intent  intent clearStack     If you need the option to add additional flags in other situations  add an optional param to the extension function   fun Intent clearStack additionalFlags  Int   0        flags   additionalFlags or Intent FLAG ACTIVITY NEW TASK or Intent FLAG ACTIVITY CLEAR TASK

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for me adding Intent FLAG ACTIVITY CLEAR TASK solved the problem   Intent i   new Intent SettingsActivity this  StartPage class                   i addFlags Intent FLAG ACTIVITY CLEAR TOP    Intent FLAG ACTIVITY CLEAR TASK   Intent FLAG ACTIVITY NEW TASK                   startActivity i   finish

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intent addFlags Intent FLAG ACTIVITY NEW TASK   Intent FLAG ACTIVITY CLEAR TASK   Intent FLAG ACTIVITY CLEAR TOP

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Kotlin example         val intent   Intent this LoginActivity  MainActivity  class java        intent flags   Intent FLAG ACTIVITY CLEAR TOP or Intent FLAG ACTIVITY NEW TASK       startActivity intent        finish

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Either add this to your Activity B and Activity C  android noHistory  true    or Override onBackPressed function to avoid back pressing with a return    Override public void onBackPressed        return

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Starting in API 16  Jelly Bean   you can just call finishAffinity     Now you can also call ActivityCompat finishAffinity Activity activity  with the compatibility library   Be sure to set taskAffinity in the manifest to a package name unique to that group of activities   See for more info  http   developer android com reference android support v4 app ActivityCompat html finishAffinity 28android app Activity 29

[android] Android: Clear the back stack

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