I have an application where after a certain amount of time I want all activities in the app's stack to be removed and replaced by a login activity screen. I've got a Runnable timer that issues this set of statements:
Intent intent = new Intent( ctx, mainActivity.class );
intent.setFlags( Intent.FLAG_ACTIVITY_CLEAR_TOP );
ctx.startActivity( intent );
This works fine when my app is in the foreground, however, when my app is in the background and I'm using another app (say, the Web Browser), the timer fires as it should and pops up the login activity screen to the foreground.
What I want is for the login activity to be activated and moved to the front of the stack, and have all other activities in the stack removed, but not have the app and activity popped to the foreground over any currently running app.
Is there any way to do this with a different method or flag? Thanks.
You could probably finish() the login activity in the onCreate event, conditional on an intent extra. Hopefully it would then be closed before it is displayed...
Related
I have an activity in my application that does a process and when finished, launches an activity with a normal intent:
Intent intent2 = new Intent();
intent2.setClass(anActivity.this, JustAnotherActivity.class);
startActivity(intent2);
finish();
The problem is that when you are doing the process, if I press the home button and take it to the background, when it finishes and calls the new activity, even if it is in the home of the phone, this new activity jumps to the foreground.
I am looking for the activity to be launched, but if the user is outside the application, it does not come to the foreground.
I guess the use of a FLAG is necessary, but the ones I have tried have not worked.
sorry for my bad english
Thanks.
what if you take care of ActivityLifecycle (OnPause, OnStop).
You can add a flag when the activity goes "OnPause/OnStop" depending what you want. And them perform the intent just if the activity is not "Pause/Stop".
Activity Lifecycle
I have an activity which is called if the app receives a push notification. The activity is started with FLAG_ACTIVITY_NEW_TASK and FLAG_ACTIVITY_CLEAR_TOP. The activity, let's call it 'A' shows UI and finishes after a while. In this point have a problem with activity stack.
Scenario:
The app is in the background with another activity 'B'
Then the app receives a push notification and starts Activity A.
After related things done, the app finishes Activity A
Then returns to Activity B and stays in the foreground even the app was in the background before the push notification is received.
After debugging, I figured out that the system calls onResume method of Activity B after finishing Activity A.
How can I do the app keep staying in background if the app started from background? Should I change intent flags of the activity A?
In your case you can achieve this in two ways
1- From manifest file with activity tag android:noHistory="true"
2- From code when you are staring the activity set flags like below
Intent mIntent = new Intent(context, Youractivity.class);
mIntent.setFlags(mIntent.getFlags() | Intent.FLAG_ACTIVITY_NO_HISTORY);
startActivity(mIntent);
For more information checkout developers link
One other thing you can do is instead of this.finish() in notificationActivity is to use this.finishAffinity();. This will close the app instead coming to foreground.
My app has a service that runs in the background. It wakes up on intent from the user which is typically generated from another application (such as sharing to my app from the web browser). After the service is done performing a task I want it to open an Activity that displays some info about the task that was completed. When the user is done looking at this info, I want them to be able to hit 'Back' or 'Close' and return to what they were doing previously (not within my application).
I've only managed to get the activity to close leaving my App's main activity front and center on the screen. This only happens if the app is still running. If it's been killed then it correctly returns to the web browser where the user intent was generated from.
How can I make the 'Back' button close the activity and return to the previous app from which this entire workflow was started?
EDIT:
This is the code I am executing from within the android service:
Intent intent = new Intent(this, TestActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
When I tap the back button from the TestActivity it returns me to the main activity of my app, not the previous app I was in when the service started TestActivity.
In second line you are using Intent.FLAG_ACTIVITY_CLEAR_TOP which is clearing your previous activity
I want to always start launcher activity after app goes to the background. I tried android:clearTaskOnLaunch="true" but it not work. How can i do this? For example i have A,B,C,D,E,F activity. A is launcher activity.
now i open app so A activity is called then A>B>C. now i minimize the application. Now i open application from the icon so app is start from C but i want it start from A so how can i do this? some said use onResume intent with Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK. but what if i press back button then onResume is called and my app start with A activity.... so it is not work..any solutions???
You can check the App is in foreground or is in background and when the application goes to the background state at the same time do some logic that when your application comes to foreground it will always show the root activity.
How you can identify application is in which state is well explained here
When you start Activity B, use these flags. That way Activity B and C will always be in a separate stack. That means that when someone starts Activity A from the home screen they will see Activity A always.
Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK
Intent intent = new Intent(context, B.class);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK)
startActivity(intent);
Also this might help, you can add this flag to your root Activity.
<activity
android:name=".ui.MainActivity"
android:clearTaskOnLaunch="true"/>
This does because device store data about application. For short time data are stored. if you want to start application from rot class. use service with application, so that whenever your application goes in background and pause then choose your action to do that will be easier.
How do I get my app to appear in on the screen after it has been replaced by some other screen/activity? Some network event occurs and my application wants to reappear in the foreground (presumably in a polite manner).
I think I need to do something like:
contxt.startActivity(myActivity);
I don't want to create another instance of my app or cause it to restart, but I want it to appear.
Use FLAG_ACTIVITY_NEW_TASK
Intent intent = new Intent(contxt, myActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
contxt.startActivity(intent);
In your myActivity onNewIntent is called. I assume myActivity is the top activity in your app current stack