Calling startActivity from outside of an Activity

Question

I m using an AlarmManager to trigger an intent that broadcasts a signal  The following is my code   AlarmManager mgr    AlarmManager  getSystemService Context ALARM SERVICE   Intent i   new Intent this  Wakeup class   try       PendingIntent pi   PendingIntent getBroadcast this  0  i  0       Long elapsed        sleep time      mgr set AlarmManager RTC WAKEUP  elapsed  pi     catch Exception r        Log v TAG   RunTimeException      r       I m calling this code from an Activity  so I don t know how I could be getting the following error     ERROR AndroidRuntime 7557   java lang RuntimeException  Unable to start receiver com wcc Wakeup  android util AndroidRuntimeException  Calling startActivity   from outside of an Activity  context requires the FLAG ACTIVITY NEW TASK flag  Is this really what you want

User · Answer

if your android version is below Android - 6 then you need to add this line otherwise it will work above Android - 6       Intent i   new Intent this  Wakeup class   i addFlags Intent FLAG ACTIVITY NEW TASK

User · Answer

Sometimes this error can occur without an explicit call to startActivity       For example  some of you may have seen a stack trace like this in Crashlytics   Fatal Exception  android util AndroidRuntimeException  Calling startActivity   from outside of an Activity  context requires the FLAG ACTIVITY NEW TASK flag  Is this really what you want         at android app ContextImpl startActivity ContextImpl java 1597         at android app ContextImpl startActivity ContextImpl java 1584         at android content ContextWrapper startActivity ContextWrapper java 337         at android text style URLSpan onClick URLSpan java 62         at android text method LinkMovementMethod onTouchEvent LinkMovementMethod java 217         at android widget TextView onTouchEvent TextView java 9522         at android view View dispatchTouchEvent View java 8968         at android view ViewGroup dispatchTransformedTouchEvent ViewGroup java 2709         at android view ViewGroup dispatchTouchEvent ViewGroup java 2425         at android view ViewGroup dispatchTransformedTouchEvent ViewGroup java 2709         at android view ViewGroup dispatchTouchEvent ViewGroup java 2425         at android widget AbsListView dispatchTouchEvent AbsListView java 5303         at android view ViewGroup dispatchTransformedTouchEvent ViewGroup java 2709         at android view ViewGroup dispatchTouchEvent ViewGroup java 2425         at android view ViewGroup dispatchTransformedTouchEvent ViewGroup java 2709         at android view ViewGroup dispatchTouchEvent ViewGroup java 2425         at android view ViewGroup dispatchTransformedTouchEvent ViewGroup java 2709         at android view ViewGroup dispatchTouchEvent ViewGroup java 2425         at android view ViewGroup dispatchTransformedTouchEvent ViewGroup java 2709         at android view ViewGroup dispatchTouchEvent ViewGroup java 2425         at android view ViewGroup dispatchTransformedTouchEvent ViewGroup java 2709         at android view ViewGroup dispatchTouchEvent ViewGroup java 2425         at android view ViewGroup dispatchTransformedTouchEvent ViewGroup java 2709         at android view ViewGroup dispatchTouchEvent ViewGroup java 2425         at android view ViewGroup dispatchTransformedTouchEvent ViewGroup java 2709         at android view ViewGroup dispatchTouchEvent ViewGroup java 2425         at android view ViewGroup dispatchTransformedTouchEvent ViewGroup java 2709         at android view ViewGroup dispatchTouchEvent ViewGroup java 2425         at android view ViewGroup dispatchTransformedTouchEvent ViewGroup java 2709         at android view ViewGroup dispatchTouchEvent ViewGroup java 2425         at android view ViewGroup dispatchTransformedTouchEvent ViewGroup java 2709         at android view ViewGroup dispatchTouchEvent ViewGroup java 2425         at android view ViewGroup dispatchTransformedTouchEvent ViewGroup java 2709         at android view ViewGroup dispatchTouchEvent ViewGroup java 2425         at com android internal policy impl PhoneWindow DecorView superDispatchTouchEvent PhoneWindow java 2559         at com android internal policy impl PhoneWindow superDispatchTouchEvent PhoneWindow java 1767         at android app Activity dispatchTouchEvent Activity java 2866         at android support v7 view WindowCallbackWrapper dispatchTouchEvent WindowCallbackWrapper java 67         at android support v7 view WindowCallbackWrapper dispatchTouchEvent WindowCallbackWrapper java 67         at com android internal policy impl PhoneWindow DecorView dispatchTouchEvent PhoneWindow java 2520         at android view View dispatchPointerEvent View java 9173         at android view ViewRootImpl ViewPostImeInputStage processPointerEvent ViewRootImpl java 4706         at android view ViewRootImpl ViewPostImeInputStage onProcess ViewRootImpl java 4544         at android view ViewRootImpl InputStage deliver ViewRootImpl java 4068         at android view ViewRootImpl InputStage onDeliverToNext ViewRootImpl java 4121         at android view ViewRootImpl InputStage forward ViewRootImpl java 4087         at android view ViewRootImpl AsyncInputStage forward ViewRootImpl java 4201         at android view ViewRootImpl InputStage apply ViewRootImpl java 4095         at android view ViewRootImpl AsyncInputStage apply ViewRootImpl java 4258         at android view ViewRootImpl InputStage deliver ViewRootImpl java 4068         at android view ViewRootImpl InputStage onDeliverToNext ViewRootImpl java 4121         at android view ViewRootImpl InputStage forward ViewRootImpl java 4087         at android view ViewRootImpl InputStage apply ViewRootImpl java 4095         at android view ViewRootImpl InputStage deliver ViewRootImpl java 4068         at android view ViewRootImpl deliverInputEvent ViewRootImpl java 6564         at android view ViewRootImpl doProcessInputEvents ViewRootImpl java 6454         at android view ViewRootImpl enqueueInputEvent ViewRootImpl java 6425         at android view ViewRootImpl WindowInputEventReceiver onInputEvent ViewRootImpl java 6654         at android view InputEventReceiver dispatchInputEvent InputEventReceiver java 185         at android os MessageQueue nativePollOnce MessageQueue java         at android os MessageQueue next MessageQueue java 143         at android os Looper loop Looper java 130         at android app ActivityThread main ActivityThread java 5942         at java lang reflect Method invoke Method java         at java lang reflect Method invoke Method java 372         at com android internal os ZygoteInit MethodAndArgsCaller run ZygoteInit java 1400         at com android internal os ZygoteInit main ZygoteInit java 1195    And you may wonder what you did wrong  since the trace only includes framework code  Well  here s an example of how this can happen  Let s say we re in a fragment   Activity activity   getActivity    Context activityContext   activity  Context appContext   activityContext getApplicationContext    LayoutInflater inflater   LayoutInflater from appContext      whoops  View view   inflater inflate R layout some layout  parent  false   TextView tvWithLinks    TextView  view findViewById R id tv with links    tvWithLinks setMovementMethod LinkMovementMethod getInstance        whoops     Now  when a user clicks on that text view  your app will crash with the stack trace above  This is because the layout inflater has a reference to the application context  and so therefore your text view has an application context  Clicking on that text view implicitly calls appContext startActivity        Final note  I tested this on Android 4  5  6  and 7 devices  It only affects 4  5  and 6  Android 7 devices apparently have no trouble calling appContext startActivity        I hope this helps someone else

User · Answer

When you want to open an activity within your app then you can call the startActivity   method with an Intent as parameter  That intent would be the activity that you want to open   First you have to create an object of that intent with first parameter to be the context and second parameter to be the targeted activity class   Intent intent   new Intent this  Activity a class   startActivity intent     Hope this will help

User · Answer

I just want to notice that startActivity from outside an activity is valid in some android versions  between N and O-MR1  and the interesting point is that it is a bug in android source code    This is the comment above startActivity implementation  See here      Calling start activity from outside an activity without FLAG ACTIVITY NEW TASK is           generally not allowed  except if the caller specifies the task id the activity should           be launched in  A bug was existed between N and O-MR1 which allowed this to work

User · Answer

Android Doc says -      FLAG ACTIVITY NEW TASK requirement is now enforced      With Android 9  you cannot start an activity from a non-activity   context unless you pass the intent flag FLAG ACTIVITY NEW TASK  If you   attempt to start an activity without passing this flag  the activity   does not start  and the system prints a message to the log       Note  The flag requirement has always been the intended behavior  and   was enforced on versions lower than Android 7 0  API level 24   A bug   in Android 7 0 prevented the flag requirement from being enforced    That means for  Build VERSION SDK INT  lt   Build VERSION CODES M      Build VERSION SDK INT  gt   Build VERSION CODES P  it is mandatory to add Intent FLAG ACTIVITY NEW TASK while calling startActivity   from outside of an Activity context   So it is better to add flag for all the versions -       Intent i   new Intent this  Wakeup class   i addFlags Intent FLAG ACTIVITY NEW TASK

User · Answer

In my case I have used context for startActivity  after changing that with ActivityName this   it solves  I m using method from util class so this happens  Hope it help some one

User · Answer

This same error I have faced in case of getting Notification in latest Android devices 9 and 10   It depends on Launch mode how you are handling it  Use below code - android launchMode  singleTask    Add this flag with Intent - intent setFlags Intent FLAG ACTIVITY NEW TASK

User · Answer

For Multiple Instance of the same activity   use the following snippet   Note   This snippet  I am using outside of my Activity  Make sure your AndroidManifest file doesn t contain android launchMode  singleTop singleInstance   if needed  you can change it to android launchMode  standard    Intent i   new Intent   setClass mActivity getApplication    TestUserProfileScreenActivity class     i setFlags Intent FLAG ACTIVITY NEW TASK   Intent FLAG ACTIVITY MULTIPLE TASK       Launch the new activity and add the additional flags to the intent mActivity getApplication   startActivity i     This works fine for me  Hope  this saves times for someone  If anybody finds a better way  please share with us

User · Answer

Try changing to this line   PendingIntent pendingIntent   PendingIntent getBroadcast getContext    0  i  0

User · Answer

You didn t paste the part where you call startActivity  that s the interesting part   You might be calling startActivity in a Service context  or in an Application context   Print  this  to log cat before making the startActivity call  and see what it refers to  it s sometimes a case of using an inner  this  accidentally

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

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