My application has the following flow screens :
Home->screen 1->screen 2->screen 3->screen 4->screen 5
Now I have a common log out button in each screens
(Home/ screen 1 / screen 2 /screen 3/ screen 4 / screen 5)
I want that when user clicks on the log out button(from any screen), all the screens will be finished and a new screen Log in will open .
I have tried nearly all FLAG_ACTIVITY to achieve this.
I also go through some answers in stackoverflow, but not being able to solve the problem.
My application is on Android 1.6 so not being able to use FLAG_ACTIVITY_CLEAR_TASK
Is there any way to solve the issue ?
Use:
Intent intent = new Intent(getApplicationContext(), Home.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
This will clear all the activities on top of home.
Assuming you are finishing the login screen when the user logs in and home is created and afterward all the screens from 1 to 5 on top of that one. The code I posted will return you to home screen finishing all the other activities. You can add an extra in the intent and read that in the home screen activity and finish it also (maybe launch login screen again from there or something).
I am not sure but you can also try going to login with this flag. I don't know how the activities will be ordered in that case. So don't know if it will clear the ones below the screen you are on including the one you are currently on but it's definitely the way to go.
You may try Intent.FLAG_ACTIVITY_CLEAR_TASK|Intent.FLAG_ACTIVITY_NEW_TASK. It will totally clears all previous activity(s) and start new activity.
Before launching your new Activity, simply add the following code:
finishAffinity();
Or if you want it to work in previous versions of Android:
ActivityCompat.finishAffinity(this);
When the user wishes to exit all open activities, they should press a button which loads the first Activity that runs when your application starts, clear all the other activities, then have the last remaining activity finish. Have the following code run when the user presses the exit button. In my case, LoginActivity is the first activity in my program to run.
Intent intent = new Intent(getApplicationContext(), LoginActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
intent.putExtra("EXIT", true);
startActivity(intent);
The above code clears all the activities except for LoginActivity. Then put the following code inside the LoginActivity's onCreate(...), to listen for when LoginActivity is recreated and the 'EXIT' signal was passed:
if (getIntent().getBooleanExtra("EXIT", false)) {
finish();
}
Why is making an exit button in Android so hard?
Android tries hard to discourage you from having an "exit" button in your application, because they want the user to never care about whether or not the programs they use are running in the background or not.
The Android OS developers want your program to be able to survive an unexpected shutdown and power off of the phone, and when the user restarts the program, they pick up right where they left off. So the user can receive a phone call while they use your application, and open maps which requires your application to be freed for more resources.
When the user resumes your application, they pick up right where they left off with no interruption. This exit button is usurping power from the activity manager, potentially causing problems with the automatically managed android program life cycle.
I guess I am late but there is simple and short answer.
There is a finishAffinity() method in Activity that will finish the current activity and all parent activities, but it works only in Android 4.1 or higher.
For API 16+, use
finishAffinity();
For below 16, use
ActivityCompat.finishAffinity(YourActivity.this);
Hope it helps!
Intent intent = new Intent(this, classObject);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | IntentCompat.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
This Will work for all Android versions. Where IntentCompat the class added in Android Support library.
Use the following for activity
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK);
remove CLEAR_TASK flag for fragment use.
I hope this may use for some people.
On a side note, good to know
This answer works (https://stackoverflow.com/a/13468685/7034327)
Intent intent = new Intent(getApplicationContext(), LoginActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK|Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
this.finish();
whereas this doesn't work
Intent intent = new Intent(getApplicationContext(), LoginActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
.setFlags() replaces any previous flags and doesn't append any new flags while .addFlags() does.
So this will also work
Intent intent = new Intent(getApplicationContext(), LoginActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
From developer.android.com:
public void finishAffinity ()
Added in API level 16
Finish this activity as well as all activities immediately below it in the current task that have the same affinity. This is typically used when an application can be launched on to another task (such as from an ACTION_VIEW of a content type it understands) and the user has used the up navigation to switch out of the current task and in to its own task. In this case, if the user has navigated down into any other activities of the second application, all of those should be removed from the original task as part of the task switch.
Note that this finish does not allow you to deliver results to the previous activity, and an exception will be thrown if you are trying to do so.
If your application has minimum sdk version 16 then you can use finishAffinity()
Finish this activity as well as all activities immediately below it in the current task that have the same affinity.
This is work for me In Top Payment screen remove all back-stack activits,
#Override
public void onBackPressed() {
finishAffinity();
startActivity(new Intent(PaymentDoneActivity.this,Home.class));
}
http://developer.android.com/reference/android/app/Activity.html#finishAffinity%28%29
In my case I use finishAffinity() function in last activity like:
finishAffinity()
startHomeActivity()
Hope it'll be useful.
A solution I implemented for this (I think I found it on Stack Overflow somewhere, but I don't remember, so thanks to whoever did that in the first place):
From any of your activities do this:
// Clear your session, remove preferences, etc.
Intent intent = new Intent(getBaseContext(), LoginActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
Then in your LoginActivity, overwrite onKeyDown:
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
moveTaskToBack(true);
return true;
}
return super.onKeyDown(keyCode, event);
}
For logout button on last screen of app, use this code on logout button listener to finish all open previous activities, and your problem is solved.
{
Intent intent = new Intent(this, loginScreen.class);
ntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
}
Intent i1=new Intent(getApplicationContext(),StartUp_Page.class);
i1.setAction(Intent.ACTION_MAIN);
i1.addCategory(Intent.CATEGORY_HOME);
i1.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
i1.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
i1.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(i1);
finish();
i have same problem
you can use IntentCompat , like this :
import android.support.v4.content.IntentCompat;
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK |IntentCompat.FLAG_ACTIVITY_CLEAR_TASK);
this code work for me .
Android api 17
instead of using finish() just use finishAffinity();
Log in->Home->screen 1->screen 2->screen 3->screen 4->screen 5
on screen 4 (or any other) -> StartActivity(Log in) with FLAG_ACTIVITY_CLEAR_TOP
for API >= 15 to API 23
simple solution.
Intent nextScreen = new Intent(currentActivity.this, MainActivity.class);
nextScreen.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | IntentCompat.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(nextScreen);
ActivityCompat.finishAffinity(currentActivity.this);
If you are using startActivityForResult() in your previous activities, just override OnActivityResult() and call the finish(); method inside it in all activities.. This will do the job...
When user click on the logout button then write the following code:
Intent intent = new Intent(this, LoginActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
And also when after login if you call new activity do not use finish();
I guess I am late but there is simple and short answer. There is a finishAffinity() method in Activity that will finish the current activity and all parent activities, but it works only in Android 4.1 or higher.
For API 16+, use
finishAffinity();
For below 16, use
ActivityCompat.finishAffinity(YourActivity.this);
Hope it helps!
shareedit
answered May 27 '18 at 8:03
Akshay Taru
Simply, when you go from the login screen, not when finishing the login screen.
And then in all forward activities, use this for logout:
final Intent intent = new Intent(getBaseContext(), LoginScreen.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
context.startActivity(intent);
It works perfectly.
If you log in the user in screen 1 and from there you go to the other screens, use
Intent intent = new Intent(this, Screen1.class);
intent.addFlags(FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
I found this way, it'll clear all history and exit
Intent startMain = new Intent(Intent.ACTION_MAIN);
startMain.addCategory(Intent.CATEGORY_HOME);
startMain.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(startMain);
Intent intent = new Intent(getApplicationContext(), SplashScreen.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
finish();
System.exit(0);
I found this solution to work on every device despite API level (even for < 11)
Intent intent = new Intent(getApplicationContext(), LoginActivity.class);
ComponentName cn = intent.getComponent();
Intent mainIntent = IntentCompat.makeRestartActivityTask(cn);
startActivity(mainIntent);
Best way to close all the previous activities and clear the memory
finishAffinity()
System.exit(0);
I have tried the flags on my end and still haven't worked. I have an application with a very similar design and I have a possible solution in terms of logic. I have built my Login and Logout using shared preferences.
If I logout, data in my shared preferences is destroyed/deleted.
From any of my activities such as Home.java I check whether shared preferences has data and in this case it won't because I destroyed it when I logged out from one of the screens. Therefore logic destroys/finishes that activity and takes me back to the Login activity. You can replicate this logic in all your other activities.
However remember to perform this check inside onPostResume() because this is what is called when you go back to Home.java
Code Sample Below:
#Override
protected void onPostResume() {
SharedPreferences pref = this.getSharedPreferences("user_details", Context.MODE_PRIVATE);
if (pref.getAll().isEmpty()){
//Shared Preferences has no data.
//The data has been deleted
Intent intent = new Intent(getApplicationContext(), Login.class);
startActivity(intent);
finish();
//Finish destroys that activity which in our case is the Home.java
}
super.onPostResume();
}
In Kotlin this way:
in Another Activity (with some classes), under Imports
var activity:Activity?=null
get() = field
set(value) {
field = value
}
Then, under onCreate
activity=this
in MainActivity now:
activity?.finish()
Related
My activity stack:
Main -> Restaurant Menu -> Order Details.
When order is placed I need to close the Restaurant Menu and Order Details
and Start new activity called Active Order
Main -> Active Order. (need to close top 2 activity)
I have tried with all the options like below
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
All the solution I found behaving like below
Main -> Restaurant Menu -> Active Order. (close Order details)
only Active Order. (close everything and start new)
How can I achieve this.
Main -> Active Order. ?
Thanks.
My idea that you could use is to set a SharedFile each time a new intent starts, and after you use startActivity();, I would put finish(); after to close the current activity before it opens the new one.
I have used bellow like..
Intent intent = new Intent(this, MainActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);
this.startActivity(intent);
this.finish();
Intent i = new Intent(getActivity(), ActiveOrder.class);
i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(i);
You can launch an activity like that:
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
This is a minimal example how you can create an Intent and start an Activity in Android.
Intent intent = new Intent(this,Home.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
Try this way
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK);
According to Android Developers resource on Intent:
FLAG_ACTIVITY_CLEAR_TASK : If set in an Intent passed to Context.startActivity(), this flag will cause any existing task that would be associated with the activity to be cleared before the activity is started.
FLAG_ACTIVITY_NEW_TASK : If set, this activity will become the start of a new task on this history stack.
After calling startActivity(intent) put this line for better accuracy:
YourActivity.this.finish();
when I try to quit my Android application by overwriting the function for the back-button of Android devices and "System.exit(0)", this doesn't work.
I have an activity named "LoginActivity" and an activity named "OverviewActivity".
When I start an intent in OverviewActivity to switch to LoginActivity, this works.
Intent changeViewIntent = new Intent(OverviewActivity.this,
LoginActivity.class);
startActivity(changeViewIntent);
Now I am in LoginActivity and there is the overwritten method:
#Override
public void onBackPressed() {
System.exit(0);
}
But when I press the back-key (e.g. in the device simulator) the screen is blank for a millisecond and then it goes back to the OverviewActivity.
Why is this happening? I just want to force the close when the back-key is pressed.
History disabling for the OverviewActivity in the manifest is no option, because there are several ways to access the OverviewActivity from other activities.
Maybe there is an idea? Android 4 is minimium requirement, so it doesn't have to work on lower versions..
Thanks!
The Exit is possible by deleting the whole activity-call-history and starting the Home-Activity of the Home-Scrren.
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_HOME);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
What you can do is
In your OverviewActivity:
Intent changeViewIntent = new Intent(OverviewActivity.this,
LoginActivity.class);
startActivity(changeViewIntent);
OverviewActivity.this.finish();
after starting the intent you terminate the overview activity
and in LoginActivity
#Override
public void onBackPressed() {
LoginActivity.this.finish();
}
This way your app will exit.
The difference between finish() and System.exit(0)
The VM stops further execution and program will be exit.
Now, in your case the first activity comes back due to activity stack.
So when you move from one activity to another using Intent, do the finish() of current activity like this.
If you want to force quit you can use
android.os.Process.killProcess(android.os.Process.myPid());
System.exit(0);
getParent().finish();
But you should not use System.exit especially if your activity uses other recourses in the background e.g. Internet, Video, etc.
Is this A correct way to manually refresh an activity?
....
case R.id.action_refresh:
Intent i = new Intent(Homepage.this, Homepage.class);
Toast.makeText(Homepage.this, "refreshing", Toast.LENGTH_LONG).show();
finish();
startActivity(i);
seeing that this method destroys the activity and recreates it, i was wandering weither it may be to much of a costly method.
The method given by you is a standard one. But if you need another method you can use the following method
onCreate(null)
I have a view in my android app that needs to open another view
and also close\finish all the calling hierarchy that made it open.
How can i do this?
If i use this code, the finish() is never called no?
Intent intent = new Intent(A.this, B.class);
setResult(RESULT_OK);
startActivity(intent);
finish();
You can clear whole stack using:
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
this is a solution if you want to start new activity, and close all activities that were open before it.
Google has an informative article on the Android back stack here.
In your code the .finish() is called and your calling activity should finish, but only that Activity and not others in the back stack. You can maintain some control of your back stack via Intent flags that are explained in the article, i.e.FLAG_ACTIVITY_NEW_TASK, FLAG_ACTIVITY_CLEAR_TOP, FLAG_ACTIVITY_SINGLE_TOP.
Another method is to use startActivityForResult(...) and close unwanted Activities in the onActivityResult(..) method in your Activity when it returns to the foreground..
My code allows me to launch a new activity/class:
Intent intent = new Intent(activity1.this, activity2.class);
startActivity(intent);
finish();
What if i have an activity already open, and just want to go back to it instead of reopening a new one, thus having multiple open of same.. So i want to switch back to an already open activity/class ?
Intent intent = new Intent(activity1.this, activity2.class);
intent .setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
startActivity(intent);
It's the same thing. Android OS doesn't create 2 different versions of your activity, it works with already created activities.
Really simple:
finish();
If you want to choose an already existing activity in the backstack and not simply the latest opened that will be more complex and I don't know if you can modify the normal application workflow
Add this
FLAG_ACTIVITY_REORDER_TO_FRONT to your Intent you use with startActivity() .
Also remove finish()
If I'm getting you right, you need to use Intent.FLAG_ACTIVITY_REORDER_TO_FRONT flag. In this case your activity, if it was created before, will be brought to the front. As documentation states,
If set in an Intent passed to Context.startActivity(),
this flag will cause the launched activity to be brought
to the front of its task's history stack if it is already running.