How can I return to a parent activity correctly

Question

I have 2 activities  A and B  in my android application and I use an intent to get from activity A to activity B  The use of parent activity is enabled    lt activity         android name  quot  B quot          android label  quot B quot   gt           lt meta-data             android name  quot android support PARENT ACTIVITY quot              android value  quot com example app name A quot    gt     lt  activity gt   I also use a theme which provides an UP-button  So after I called activity B I can use the UP-button to get back to the activity A  The problem is that the application seems to call the onCreate  -function of activity A again and this is not the behaviour I need  I need activity A to look the same way like it looked before I called activity B  Is there a way to achieve this  EDIT I didn t write any code to start activity B from activity A  I think it is auto-generated by Eclipse  Class B looks like       Override public void onCreate Bundle savedInstanceState        super onCreate savedInstanceState       setContentView R layout activity b       getActionBar   setDisplayHomeAsUpEnabled true       Override public boolean onCreateOptionsMenu Menu menu        getMenuInflater   inflate R menu activity b  menu       return true       Override public boolean onOptionsItemSelected MenuItem item        switch  item getItemId              case android R id home              NavUtils navigateUpFromSameTask this               return true            return super onOptionsItemSelected item

User · Answer

Although an old question  here is another  imho the cleanest and best  solution as all the previous answeres didn t work for me since I deeplinked Activity B from a Widget   public void navigateUp     final Intent upIntent   NavUtils getParentActivityIntent this   if  NavUtils shouldUpRecreateTask this  upIntent     isTaskRoot          Log v logTag   Recreate back stack            TaskStackBuilder create this  addNextIntentWithParentStack upIntent  startActivities        else       NavUtils navigateUpTo this  upIntent            https   stackoverflow com a 31350642 570168    But also see  https   speakerdeck com jgilfelt this-way-up-implementing-effective-navigation-on-android

User · Answer

You declared activity A with the standard launchMode in the Android manifest  According to the documentation  that means the following      The system always creates a new instance of the activity in the target   task and routes the intent to it    Therefore  the system is forced to recreate activity A  i e  calling onCreate  even if the task stack is handled correctly   To fix this problem you need to change the manifest  adding the following attribute to the A activity declaration   android launchMode  singleTop    Note  calling finish    as suggested as solution before  works only when you are completely sure that the activity B instance you are terminating lives on top of an instance of activity A  In more complex workflows  for instance  launching activity B from a notification  this might not be the case and you have to correctly launch activity A from B

User · Answer

try this   Intent intent   Override public void onCreate Bundle savedInstanceState        intent   getIntent           super onCreate savedInstanceState       setContentView R layout activity b       getActionBar   setDisplayHomeAsUpEnabled true       Override public boolean onCreateOptionsMenu Menu menu        getMenuInflater   inflate R menu activity b  menu       return true        Override public boolean onOptionsItemSelected MenuItem item        switch  item getItemId              case android R id home              NavUtils navigateUpTo this intent               return true            return super onOptionsItemSelected item

User · Answer

Add to your activity manifest information with attribute   android launchMode  singleTask    is working well for me

User · Answer

I had a similar problem using android 5 0 with a bad parent activity name   lt activity         android name   DisplayMessageActivity          android label   string title activity display message          android parentActivityName   MainActivity   gt           lt meta-data             android name  android support PARENT ACTIVITY              android value  com example myfirstapp MainActivity    gt       lt  activity gt    I removed the com example myfirstapp from the parent activity name and it worked properly

User · Answer

Try this solution use NavUtils navigateUpFromSameTask this   in the child activity  https   stackoverflow com a 49980835 7308789

User · Answer

Adding to  LorenCK s answer  change   NavUtils navigateUpFromSameTask this     to the code below if your activity can be initiated from another activity and this can become part of task started by some other app  Intent upIntent   NavUtils getParentActivityIntent this   if  NavUtils shouldUpRecreateTask this  upIntent         TaskStackBuilder create this               addNextIntentWithParentStack upIntent               startActivities      else       NavUtils navigateUpTo this  upIntent       This will start a new task and start your Activity s parent Activity which you can define in Manifest like below of Min SDK version  lt   15   lt meta-data         android name  android support PARENT ACTIVITY          android value  com example app name A    gt    Or using parentActivityName if its   15

User · Answer

Updated Answer  Up Navigation Design   You have to declare which activity is the appropriate parent for each activity  Doing so allows the system to facilitate navigation patterns such as Up because the system can determine the logical parent activity from the manifest file   So for that you have to declare your parent Activity in tag Activity with attribute   android parentActivityName  Like    lt  -- The main home activity  it has no parent activity  -- gt       lt activity         android name  com example app name A      gt                   lt  activity gt       lt  -- A child of the main activity -- gt       lt activity         android name   B          android label  B          android parentActivityName  com example app name A   gt           lt  -- Parent activity meta-data to support 4 0 and lower -- gt           lt meta-data             android name  android support PARENT ACTIVITY              android value  com example app name A    gt       lt  activity gt    With the parent activity declared this way  you can navigate Up to the appropriate parent like below    Override public boolean onOptionsItemSelected MenuItem item        switch  item getItemId             Respond to the action bar s Up Home button     case android R id home          NavUtils navigateUpFromSameTask this           return true            return super onOptionsItemSelected item       So When you call NavUtils navigateUpFromSameTask this   this method  it finishes the current activity and starts  or resumes  the appropriate parent activity  If the target parent activity is in the task s back stack  it is brought forward as defined by FLAG ACTIVITY CLEAR TOP   And to display Up button you have to declare setDisplayHomeAsUpEnabled      Override public void onCreate Bundle savedInstanceState                getActionBar   setDisplayHomeAsUpEnabled true       Old Answer   Without Up Navigation  default Back Navigation   It happen only if you are starting Activity A again from Activity B   Using startActivity     Instead of this from Activity A start Activity B using startActivityForResult   and override onActivtyResult   in Activity A   Now in Activity B just call finish   on button Up  So now you directed to Activity A s onActivityResult   without creating of Activity A again

User · Answer

I had pretty much the same setup leading to the same unwanted behaviour  For me this worked  adding the following attribute to an activity A in the Manifest xml of my app   android launchMode  singleTask    See this article for more explanation

User · Answer

In Java class  -       toolbar    Toolbar  findViewById R id apptool bar       setSupportActionBar toolbar        getSupportActionBar   setTitle  Snapdeal         getSupportActionBar   setHomeButtonEnabled true       getSupportActionBar   setDisplayHomeAsUpEnabled true     In Manifest  -   lt activity             android name   SubActivity              android label   string title activity sub              android theme   style AppTheme   gt               lt meta-data android name  android support PARENT ACTIVITY  android value   MainActivity  gt  lt  meta-data gt       lt  activity gt    It will help you

User · Answer

Override public boolean onOptionsItemSelected MenuItem item       switch  item getItemId         Respond to the action bar s Up Home button     case android R id home          finish            return true    return super onOptionsItemSelected item     like a Back press

User · Answer

Going into my manifest and adding android launchMode  singleTop  to the activity did the trick for me     This specifically solved my issue because I didn t want Android to create a new instance of the previous activity after hitting the Up button in the toolbar - I instead wanted to use the existing instance of the prior activity when I went up the navigation hierarchy   Reference  android launchMode

User · Answer

I tried android launchMode  singleTask   but it didn t help  Worked for me using android launchMode  singleInstance

User · Answer

What worked for me was adding        Override     public boolean onOptionsItemSelected MenuItem item             switch  item getItemId                  case android R id home                  onBackPressed                    return true              default                  return super onOptionsItemSelected item                         Override     public void onBackPressed             finish            to TheRelevantActivity java and now it is working as expected   and yeah don t forget to add   getSupportActionbar setDisplayHomeAsUpEnabled true   in onCreate   method

User · Answer

A better way to achieve this is by using two things  call   NavUtils navigateUpFromSameTask this     Now  in order for this to work  you need to have your manifest file state that activity A has a parent activity B  The parent activity doesn t need anything  In version 4 and above you will get a nice back arrow with no additional effort  this can be done on lower versions as well with a little code  I ll put it below  You can set this data in the manifest- application tab in the GUI  scroll down to the parent activity name  and put it by hand   Support node   if you wish to support version below version 4  you need to include metadata as well  right click on the activity  add- meta data  name  android support PARENT ACTIVITY and value   your full activity name  to get the nice arrow in lower versions as well   getSupportActionBar   setDisplayHomeAsUpEnabled true     please note you will need support library version 7 to get this all working  but it is well worth it

[android] How can I return to a parent activity correctly?

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