android:launchMode="singleTop"

Android: new Intent() starts new instance with
android:launchMode="singleTop"

I have Activity

A

with

android:launchMode="singleTop"

in the manifest.

If I go to Activity

B

,

C

and

D

there I have menu shortcuts to return to my applications root activity (

A

).

The code looks like this:

Intent myIntent = new Intent(getBaseContext(), MainActivity.class);

startActivity(myIntent);

However, instead of returning to the already existing instance A of my MainActivity.class

it creates a new instance -> it goes to onCreate() instead of onNewIntent().

This is not the expected behavior, right?

This question and answers originated from stackoverflow.com
Question by Stefan Klumpp

Answer3:

This should do the trick.

<activity ... android:launchMode="singleTop" />

When you create an intent to start the app use:

Intent intent=new Intent(context, YourActivity.class);

intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_SINGLE_TOP);

This is that should be needed.

Answer by PHP_Jedi

Answer2:

The "standard" and "singleTop" modes
differ from each other in just one
respect: Every time there's new intent
for a "standard" activity, a new
instance of the class is created to
respond to that intent. Each instance
handles a single intent. Similarly, a
new instance of a "singleTop" activity
may also be created to handle a new
intent. However, if the target task
already has an existing instance of
the activity at the top of its
stack
, that instance will receive
the new intent (in an onNewIntent()
call); a new instance is not created.

I'm not 100% sure what "already has an existing instance of the
activity at the top of its stack" means, but perhaps your activity isn't
meeting this condition.

Would

singleTask

or

singleInstance

work for
you? Or perhaps you could try setting

FLAG_ACTIVITY_SINGLE_TOP

on the intent you are creating to see if that makes a difference,
although I don't think it will.

Answer by mbaird

It means that the task stack (application stack) that is currently active has an instance of that activity on top (e.g. an activity is starting another copy of the same activity when it has focus). Other instances of the same activity may exist on other tasks (applications). – Seth Illgard May 4 at 21:39

So if my will is to launch a new instance of activity in the same proccess, but i already FOCUSED on a previouse instance of that activity, how would i do that? – rayman Jul 14 at 7:31

Answer1:

What actually worked for me in the end was this:

Intent myIntent = new Intent(getBaseContext(), MainActivity.class);

myIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

startActivity(myIntent);

Answer by znq

original from: http://stackoverflow.com/questions/2424488/android-new-intent-starts-new-instance-with-androidlaunchmodesingletop