Calling startActivity() from outside of an Activity context
AndroidAndroid ActivityAndroid ContextAndroid Problem Overview
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?
Android Solutions
Solution 1 - Android
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.
Solution 2 - Android
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 careful when you are using flags that you may 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.
Solution 3 - Android
Instead of using (getApplicationContext)
use YourActivity.this
Solution 4 - Android
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);
Solution 5 - Android
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.
Solution 6 - Android
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...
Solution 7 - Android
At the Android 28(Android P)
startActivity
if ((intent.getFlags() & Intent.FLAG_ACTIVITY_NEW_TASK) == 0
&& (targetSdkVersion < Build.VERSION_CODES.N
|| targetSdkVersion >= Build.VERSION_CODES.P)
&& (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 >= Build.VERSION_CODES.P) {
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
}
context.startActivity(intent);
Solution 8 - Android
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);
Solution 9 - Android
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 ...
Solution 10 - Android
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
Solution 11 - Android
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);
Solution 12 - Android
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.
Solution 13 - Android
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.
Solution 14 - Android
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.
Solution 15 - Android
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.
Solution 16 - Android
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....
Solution 17 - Android
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);
Solution 18 - Android
Intent viewIntent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
viewIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(viewIntent);
i hope this will work.
Solution 19 - Android
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.
Solution 20 - Android
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);
Solution 21 - Android
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.
Solution 22 - Android
Intent i= new Intent(context, NextActivity.class);
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_SINGLE_TOP);
Solution 23 - Android
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"));
Solution 24 - Android
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)
Solution 25 - Android
Kotlin version
val intent = Intent(Intent.ACTION_EDIT, ContactsContract.Profile.CONTENT_URI)
intent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
this.startActivity(intent)
Solution 26 - Android
If you use databinding, just get your context with
binding.root.context
This solved my problem.
Solution 27 - Android
Calling startActivity() from outside of an Activity context get from your view
> Don't
val context = activity.applicationContext
openBrowser(context, MenuUrl.TERM_CONDITION)
> Do
1. val context = binding.root.context // If you are using view binding
2. val context = yourView.context // If you are not use view binding
openBrowser(context, MenuUrl.TERM_CONDITION)
Thank You.
Solution 28 - Android
For people coming from Xamarin.Forms or Xamarin.Android, In your Xamarin.Android project, use:
Xamarin.Essentials.Platform.CurrentActivity.StartActivity(intent);
Note that this might require Xamarin.Essentials v1.5 or above
As @Alex Volovoy mentioned, setting flags should be avoided as it will interfere with normal flow of event and history stack.