I have an application with 3 layers. A, B, C.
A and B are fixed and C can be any one of the multiple activities.
Application normally works in A>B>C direction.
A calls B with startActivityForResult method. B calls C with startActivityForResult too and result of C is processed in B and passed back to A via onActivityResult methods on all layers.
It works fine but I somehow want the activity A to call C directly (where i have implemented a thread to do stuff in background) using
Intent i = new Intent("com.intentntfiltername.ACVITIY-C");
startActivity(i);
C then switches back to A by resuming it.
After this A would call B for result.
B would then call C using
intentName.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
startActivityForResult(intentName, requestCodeVariable);
that would not create new instance of Activity C but instead resume the old activity.
The problem is when I return to B after exiting C, onActivityResult is never called. It just resumes the B activity without processing any results from C.
i.e on Activity Result is not working when we try to call an already running activity for result.
Please tell me how to implement this. Or any other workaround only if its not possible for an already running activity.
when I finish an activity that was started for a result, I call for example
Intent intent = new Intent();
intent.putExtra("email", email);
act.setResult(RESULT_OK, intent);
act.finish();
where the returned value I needed is the email of course, and "act" is the activity that Ive created in the onCreate as
act = this;
Related
I have a use-case where my Activity A will start other Activity B of some SDK, here Activity B is a transparent activity hence allowing me to still interact with A. Now from A, I start another activity C by using startActivityForResult() and from C, I am sending back the result using setResult(). But I am not able to get the result back in onActivityResult() of A.
Point to be noted here is that Activity B from other SDK is having launchmode set as "singleTask" in androidManifest file.
How I can get result back from C to A in this case?
Here is the code used in Activity A to start C :
var intent: Intent =Intent(context, ActivityC::class.java)
startActivityForResult(intent,1009)
In Activity C setting result like this :
val returnIntent = Intent()
setResult(Activity.RESULT_OK, returnIntent)
finish()
The code is okey. But the thing is, that when you start activity b, then in your stack, activity b will be the last to be created, so when you then start c, the result from c goes to b instead of a.
Try launching c before b to make sure this is the issue.
If Activity B is from another SDK and you can't control the navigation flow, then you have to store the data somewhere and check that onResume() function of Activity A.
To describe the situation, say that I have 3 activities: A, B, and C
and there is a button in activity A which starts activity B, and there is a button in activity C when it is clicked, it should send a result from activity C to activity A
My Question is...Is there a way to pass a result from C to A? If there is a way, what it is?
Note: It would be good if the way you give uses the methods startActivityForResult(...) and onActivityResult(...)
Thank you in advance
If you just using simple types like String objects you can use Bundle and supplementary variables in B,C activities. And transfer it from C->B->A using onActivity result. Or you could use Shared preferences.
There's a flag of Intent called FLAG_ACTIVITY_FORWARD_RESULT. Call:
Intent intent = new Intent(this, ActivityB.class);
startActiivtyForResult(intent);
when starting Activity B (by calling startActivityForResult(intent)).
When opening C, call:
Intent intent = new Intent(this, ActivityB.class);
intent.setFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT);
startActiivtyForResult(intent);
finish();
which means: open C, close B. Then, when closing Acitivity C, call:
setResult(123);
finish();
the result from C will go back to A.
You can use Intent to transfer data if you are navigating from Activity C to Activity A. Otherwise, I would suggest using an Interface, and then pass the data as parameter in a callback method present in Activity A. You said you wanted answers like onActivityResult, for that I guess the Activity C should exit or something to invoke onActivityResult in the Activity A
I have 3 different activities in a TabGroupActivity. Let's say A - Parent, B - Child 1, C - Child 2.
A --- starts --> B
B --- starts --> C
and I have an alert dialog in C which shows some message. I want to go back to activity A when I press Ok button on dialog.
But the problem is that I can open activity C from other activities too and I want to go back to their parent activities too. So I need to make something which will work no matter which activity opens C. I've tries with this one but didn't work :
Intent intent = new Intent(Synchronization.this,Synchronization.this.getParent().getClass());
but it didn't help me. Any suggestions?
You just have to make use of two Activity methods viz. startActivityForResult() and onActivityResult()
Example : http://www.vogella.de/articles/AndroidIntent/article.html#explicitintents
Here goes the logic :
In ActivityB
Start ActivityC by using startActivityForResult(activityCIntent,INT_CODE);
In ActivityC
Now check if Dialog's OK Button is pressed, if yes then set the result using setResult(RESULT_OK,intent); and then call finish();
Then control will be redirected to ActivityB's onActivityResult() method.
Now inside onActivityMethod() check whether result_code==RESULT_OK and requestCode = INT_CODE. If yes then simply call finish();
In the Activity B start the C Activity as startActivityForResult() so when you finish the C activity it will back to the B with result. As the result you may pass flag with the intent object.
Now when you finish the C activity with ok button then set the result as RESULT_OK into the setResult() if you need to pass the data back to the B activity you may set the data into the Intent add this intent with the setResult() method and then finish the C Activity.
Now in B check the requestcode is from the C then finish this Activity. As you start this C Activity you can also start the B Activity for the A Activity.
And you need to override onActivityResult() in B activity and if you start the B Activity as for result then also you need to define also into A Activity
I have the following scenario (note that activity A has launchMode="singleTop"):
Activity A calls startActivityForResult() on activity B;
Activity B calls startActivity() on C, after which setResult(RESULT_OK) and finish(); at this point, onActivityResult() in A is NOT called.
Activity C calls startActivity() on A using FLAG_ACTIVITY_CLEAR_TOP and finish();
This is where my problem occurs. At this point, A's onActivityResult() is called with the right requestCode, but something else than RESULT_OK as the resultCode. I was expecting it to receive RESULT_OK because I have set it in B (which was started for result).
Why am I getting something other than RESULT_OK?
Read this doc:
http://developer.android.com/reference/android/content/Intent.html#FLAG_ACTIVITY_CLEAR_TOP
If set, and the activity being launched
is already running in the current
task, then instead of launching a new
instance of that activity, all of the
other activities on top of it will be
closed and this Intent will be
delivered to the (now on top) old
activity as a new Intent.
Passing clear top flag will finish all activities in the stack. So what you'll get in onActivityResult is probably a "notification" that the activity for which you want the result was canceled. (aka RESULT_CANCELED = 0x00)
UPDATE
When I use startActivityForResult, after setting the result, I always finish my activity and let the caller come to action.
You are doing something less common: you set the result, finish your activity but you also start another one. I don't know is the expected behavior in this situation. Can't you change the interaction between the activities?
You could try to call finish() first and then start the new activity (do this in activities B and C). Anyway, I also don't know what should happen when you do this. I recommend you the first approach (changing the interaction so you don't return a result and create a new activity at the same time).
Perhaps you could chain two startActivityForResult or your activity B could send a new intent to A instead of returning its result?
I'm developing an Android 2.2 application.
I'm very new on Android, and I see that if Iaunch a new Intent from an activity, this activity goes to paused state.
If I want that user can't goes back to this previous activity, what must I do? May I kill this previous activity with finish?
UPDATE
An example:
A, B C and D are activities.
A is the first activity.
A launches B, and B launches C, and C launches D.
I want to close or kill activity B and C when D is launched.
Thanks.
You can use your intent to startActivity like normal and follow the startActivity with
finish();
If you do this on your hypothetical activity B, you can hit the hardware back button in C and it'll take you directly to A.
You might want to rework your design. What if you have A call startActivityForResult(B, 0), and when B would have launched C, instead setResult and finish. Back in A, onActivityResult gets called, with the result you set. You can use that result as a message for A to now start the activity C.
See if that helps - http://developer.android.com/reference/android/content/Intent.html#FLAG_ACTIVITY_CLEAR_TOP (This and other flags)
And also you must invoke
finish();