I have 4 Activities A,B,C,D now I have in each activity a button of Back and button Cancel
Now I went on the button back to move to the activity that I have before example if I am on B when I press on back I get to A that I have done that by finish but the problem that I have is when I am on example C and I press cancel I should get to A but dose not work I try to make a new activity but don't work.
how can I make my function Cancel to take me back to the activity A?
Just use onActivityResult() in middle activity, and while finishing C just add the line
setResult(5)
in the middle Activity B in onActivityResult
just check in resultcode=5 finish it.
check this link
You can use Intent with flag FLAG_ACTIVITY_CLEAR_TOP in startActivity.
So if you have A B C after launching A activity B and C will be closed.
For example on Activity C in cancel button click listener:
Intent cancelIntent = new Intent(this, A.class);
cancelIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(cncelIntent);
Related
I have an activity A that starts activity B. When I press back button in my device, the onCreate() method of activity B is called so I need to press back button 2 or more times to finish it. I have no idea why?!
I also tried using onBackPressed() and onOptionsItemSelected() in activity B to finish it, but that didn't work!!
I really appreciate your help =)
try to use intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); when you starting your activity B.
Try this one:
Intent i = new Intent(OldActivity.this, NewActivity.class);
// clear all activities from back stack
i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(i);
I have an application with several Activities in Android A,B,C,D. I have a question about the back stack.
A->B->C->D it is a normal sequence.
My question is : when i press the back button in Activity D, i have to go to the Activity B, not back to ActivityC. Since ActivityC have some imageView i want to save, i don't want to use noHistory to destroy the ActivityC. it is possible to do that
A1->B1->C1->D1
the back stack should be: D1->B1->A1 . C1 saved some imageView and if C1 launch again, the imageView in C1 will contain the same images. Is it possible just modify the code in ActivityC??
thank you
You should call finish() in activity C after, starting of activity D
startActivity(intent);
finish()
Handle onBackPressed() of each activity. So that after back pressing on D, it will redirect to B, then similarly to A.
Use onActivityResult() methods of an activity:-
Here is how it will work -
Use startActivityForResult() method while you are starting activity
While when you are going back
Activity D - before finishing write -
Intent i = getIntent();
setResult(RESULT_OK);
finish();
Your D is finished and c's onActivityResult() will be called - save your data and call finish() with above methodology, It will go to B's onActivityResult().
I have a 1st and a 3rd activity. I wish to push a button on the 3rd activity and it finishes the 3rd and 2nd activity switching all the way back to the 1st activity(it's the MainActivity might I add). In other words, is there a way to finish automaticly the call stack of activities to a specific activity?
You can use method startActivityForResult() to start your activity.
You need to call method setResult() when you finish the activity.
And override method onActivityResult() to do what you want to do.
Actually, seems 2 methods can solve this.
Assuming Activities: A -> B -> C, and all alive in the same stack.
1) Use android:launchMode="singleTask" for Activity A. When C calls A, A starts and both B & C finish.
2) When starting A, adding flag Intent.FLAG_ACTIVITY_CLEAR_TOP.
if you don't have to pass any data to the main activity, i guess this is what you are looking for: how back to the main activity in android?
execute this code at the button click in your 3rd activity:
Intent intent = new Intent(getApplicationContext(), MainActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
this code clears your activity stack and reopens your main activity.
I am new to Android . Here I have for activities A,B,C,D in which A is the Home Activity.It is in stack as A->B->C->D
When I press back from B or C it should go back just as normal. But if I press back from D it should go back to A and from A the app should exit
I guess you could intercept onStop() and guessing if the activity is switching to C and launching A instead. But it would result in a hard to maintain mess and I do not recommend that.
However, if for some reason you still not want to override onBackPressed and you manage to guess that D is stopping because back was pressed (without overriding onBackPressed(), just start A activity from there with an Intent with FLAG_ACTIVITY_CLEAR_TOP (call i.setFlags(FLAG_ACTIVITY_CLEAR_TOP) )
According to the doc:
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.
So A will be brought back and B and C will be cleared.
when you start your new activity finish the old activity for example if you want to start C from B :
Intent I = new Intent(B.this , C.class) ;
startActivity (I);
B.this.finish();
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