Calling startActivity from outside of an Activity context

Question

I have implemented a ListView in my Android application   I bind to this ListView using a custom subclass of the ArrayAdapter class   Inside the overridden ArrayAdapter getView      method  I assign an OnClickListener   In the onClick method of the OnClickListener  I want to launch a new activity   I get the exception   Calling startActivity   from outside of an Activity  context requires the   FLAG ACTIVITY NEW TASK flag  Is this really what you want    How can I get the Context that the ListView the current Activity  is working under

User · Answer

Kotlin version val intent   Intent Intent ACTION EDIT  ContactsContract Profile CONTENT URI  intent flags   Intent FLAG ACTIVITY NEW TASK this startActivity intent

User · Answer

I also had the same problem  Check all the context that you have passed  For  links  it needs Activity Context not Application context    This are the place where you should check     1   If you used LayoutInflater then check what context you have passed   2   If you are using any Adapter check what context you have passed

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My situation was a little different  I m testing my app using Espresso and I had to launch my Activity with ActivityTestRule from the instrumentation Context  which is not the one coming from an Activity    fun intent context  Context         Intent context  HomeActivity  class java           addFlags Intent FLAG ACTIVITY CLEAR TOP    I had to change the flags and add an or bitwise     in Java  with Intent FLAG ACTIVITY NEW TASK  So it results in   fun intent context  Context         Intent context  HomeActivity  class java           addFlags Intent FLAG ACTIVITY CLEAR TOP or Intent FLAG ACTIVITY NEW TASK

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Intent i  new Intent context  NextActivity class   i setFlags Intent FLAG ACTIVITY NEW TASK   Intent FLAG ACTIVITY SINGLE TOP

User · Answer

Elaborating Alex Volovoy s answer a little more -  in case u are getting this problem with fragments  getActivity   works fine to get the context  In Other Cases   If you don t want to use-  myIntent setFlags Intent FLAG ACTIVITY NEW TASK    not recommend   then make a function like this in your OutsideClass -  public void gettingContext Context context       real context   context   where real context is a global variable of type Context     Now in your main activity when ever you make a new OutsideClass call the above method immediately after you define the OutsideClass giving the activity s context as argument  Also in your main activity make a function-  public void startNewActivity final String activity to start        if activity to start equals  ACTIVITY KEY           ACTIVITY KEY-is a custom key just to       differentiate different activities     Intent i   new Intent MainActivity this  ActivityToStartName class       activity context startActivity i            you can make a if-else ladder or use switch-case   now come back to your OutsideClass and to start new activity do something like this-   Override public void onClick View v             case R id any button               MainActivity mainAct    MainActivity  real context                           mainAct startNewActivity  ACTIVITY KEY                                break                     This way you will be able to start different activities called from different OutsideClass without messing up with flags    Note-Try not to cache context object via constructor for fragment with adapter its fine  A fragment should have a empty constructor otherwise application crashes in some scenarios   remember to call   OutsideClass gettingContext Context context     in the onResume   function as well

User · Answer

In my opinion  it s better to use the method of startActivity   just in the your code of the Activity class   If you use that in the Adapter or other class  it will result in that

User · Answer

This error goes when startactivity doesn t know which is his activity  So you must add activity before startActivity    you must set  context startActivity yourIntent

User · Answer

Intent viewIntent   new Intent Settings ACTION LOCATION SOURCE SETTINGS       viewIntent setFlags Intent FLAG ACTIVITY NEW TASK       startActivity viewIntent        i hope this will work

User · Answer

CustomAdapter mAdapter   new CustomAdapter  getApplicationContext    yourlist     or  Context mContext   getAppliactionContext    CustomAdapter mAdapter   new CustomAdapter  mContext  yourlist     change to below  CustomAdapter mAdapter   new CustomAdapter  this  yourlist

User · Answer

I think maybe you are implementing the OnClickListener in the wrong place - usually you should definitely implement an OnItemClickListener in your Activity and set it on the ListView instead  or you will get problems with your events

User · Answer

Either    cache the Context object via constructor in your adapter  or get it from your view    Or as a last resort    add  - FLAG ACTIVITY NEW TASK flag to your intent       myIntent setFlags Intent FLAG ACTIVITY NEW TASK     Edit - i would avoid setting flags as it will interfere with normal flow of event and history stack

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For anybody getting this on Xamarin Android  MonoDroid  even when StartActivity is called from activity - this is actually Xamarin bug with new ART runtime  see https   bugzilla xamarin com show bug cgi id 17630

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See  if you are creating an intent within a listiner in some method  override onClick  View v     then call the context through this view as well   v getContext      There will not even need SetFlags

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If you got error because of using create chooser like below   Intent sharingIntent   new Intent Intent ACTION VIEW   sharingIntent addFlags Intent FLAG ACTIVITY NEW TASK   sharingIntent setData Uri parse  http   google com     startActivity Intent createChooser sharingIntent   Open With       Set the flag to create chooser like this    Intent sharingIntent   new Intent Intent ACTION VIEW   sharingIntent addFlags Intent FLAG ACTIVITY NEW TASK   sharingIntent setData Uri parse  http   google com      Intent chooserIntent   Intent createChooser sharingIntent   Open With    chooserIntent addFlags Intent FLAG ACTIVITY NEW TASK    startActivity chooserIntent

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Use this code in your Adapter Activity and use context startActivity intent Object  and intent Object addFlags Intent FLAG ACTIVITY NEW TASK     Like this   Intent n act   new Intent context  N Activity class   n act addFlags Intent FLAG ACTIVITY NEW TASK   context startActivity n act     It Works

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If you are invoking share Intent in Cordova plugin  setting the Flag will not help  Instead use this -   cordova getActivity   startActivity Intent createChooser shareIntent   title

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Since adding flags affect event flow and stack history it is better to pass the  application context  to the non-activity from where you need to call an activity class in the following way    ActivityClassName this   While you pass the context in this manner it will contain all the detail and info that you need to call an Activity from a non-activity scenario   So there is no need to set or add flags  this will work fine in every case

User · Answer

I had the same problem  The problem is with context  If you want to open any links  for example share any link through chooser  pass activity context  not application context   Dont forget to add myIntent addFlags Intent FLAG ACTIVITY NEW TASK  if you are not in your activity

User · Answer

Instead of using  getApplicationContext  use YourActivity this

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Use this code  Works fine for me  Share Something from Outside of an activity   Intent intent   new Intent Intent ACTION SEND   intent setType  text plain        Append Text String Text    Your Text Here   intent putExtra Intent EXTRA TEXT  Text   intent addFlags Intent FLAG ACTIVITY NEW TASK    Intent shareIntent   Intent createChooser intent  Share           shareIntent setFlags Intent FLAG ACTIVITY NEW TASK   G context getApplicationContext   startActivity shareIntent

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At the Android 28 Android P  startActivity  if   intent getFlags    amp  Intent FLAG ACTIVITY NEW TASK     0          amp  amp   targetSdkVersion  lt  Build VERSION CODES N                    targetSdkVersion  gt   Build VERSION CODES P           amp  amp   options    null                    ActivityOptions fromBundle options  getLaunchTaskId      -1         throw new AndroidRuntimeException               Calling startActivity   from outside of an Activity                           context requires the FLAG ACTIVITY NEW TASK flag                           Is this really what you want         So the best way is add FLAG ACTIVITY NEW TASK  Intent intent   new Intent context  XXXActivity class   if  Build VERSION SDK INT  gt   Build VERSION CODES P        intent addFlags Intent FLAG ACTIVITY NEW TASK     context startActivity intent

User · Answer

In addition  if you show links in listview in fragment  do not create it like this  adapter   new ListAdapter getActivity   getApplicationContext   mStrings     instead call  adapter   new ListAdapter getActivity   mStrings     adapter works fine in both cases  but links work only in last one

User · Answer

Faced the same issue then implemented  intent addFlags Intent FLAG ACTIVITY NEW TASK     and got solved the problem   There may be an another reason which is related to list view adapter  You can see This blog  described it very well

User · Answer

You can achieve it with addFlags instead of setFlags  myIntent addFlags Intent FLAG ACTIVITY NEW TASK     According to the documentation it does      Add additional flags to the intent  or with existing flags value       EDIT  Be aware if you are using flags that you change the history stack as Alex Volovoy s answer says         avoid setting flags as it will interfere with normal flow of event and history stack

User · Answer

In your Activity  where you re calling the adapter  just change getActivityContext   with YourActivity this  Here s an exemple  yourAdapter   new YourAdapter yourList  YourActivity this      Here YourActivity this is the Context instead of getActivityContext   recyclerView setAdapter yourAdapter

[android] Calling startActivity() from outside of an Activity context

Kotlin version

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