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How to close all activity before launch new activity from AppWidgetProvider android

Hi I want to close all activity before launch new activity from AppWidgetProvider. I'm not having idea to do this. could you please suggest me any idea to do this?

you can use finishAffinity() method (from Activity, doc here). launch dummy invisible/transparent Activity, finishAffinity all Activityies and startActivity with proper Intent
there are also some flags for Intents which should clear your Activity backstack, but it depends on declared launchMode in Manifest. you may check these
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK);
or
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | FLAG_ACTIVITY_SINGLE_TOP);

Android - Bring an activity to the front from application class

I am trying to bring an activity to the front. I found many questions similar to this but none of them actually works.
I always hold a reference to the current activity in a variable in application class. While the application is running in the background (after onPause fires), if any message arrives, I need to bring the same activity to the front and display the message. The only way I got it worked is..
Intent i = new Intent(mCurrentActivity, JoboffersActivity.class);
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(i);
The issue I have got with this, is that it recreates the activity which I wanted to avoid. I tried singleInstance and singleTask both in the manifest. If I do not add FLAG_ACTIVITY_CLEAR_TOP, on back key press it takes me to the previous instance of the same activity. Even if I add sigleInstance it creates two instances of the same activity. If I do not add FLAG_ACTIVITY_NEW_TASK then it shows an error Calling startActivity() from outside of an Activity context requires the FLAG_ACTIVITY_NEW_TASK flag

Try to add another flag FLAG_ACTIVITY_SINGLE_TOP to your intent.
According to Android documentation, combination of this 2 flags:
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
brings the current instance of Activity to the front.
http://developer.android.com/reference/android/content/Intent.html#FLAG_ACTIVITY_CLEAR_TOP

How to Clear the activity stack SDK < 11

I need to clear the activity stack. All the activity except the current one in SDK 8. I want after logout from any activity I can reach to the Login Activity and All previous Activity will get Removed from the activity stack.
I have tried this solution
Intent i = new Intent(BaseActivity.this, LoginActivity.class);
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP
| Intent.FLAG_ACTIVITY_SINGLE_TOP);
startActivity(i);
But it is not working. I can't use finish() because user can logout from any activity.
Your Help is Highly appreciable.

Just use this flag on its own Intent. FLAG_ACTIVITY_CLEAR_TASK

Use This
Normally when we launch new activity, it’s previous activities will be kept in a queue like a stack of activities. So if you want to kill all the previous activities, just follow these methods
Intent i = new Intent(OldActivity.this, NewActivity.class);
// set the new task and clear flags
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK)
startActivity(i);

I have got two Beautiful solution of my problem.
SOLUTION 1:
One is by using Broadcast Receiver. That I can broadcast a message to all my activity and onRecive() I can finish all my activity. As this Link says.
SOLUTION 2 (A Much Easier way):
Second is by managing a flag in ShearedPrefrences or in Application Activity. In starting of app (on splash screen) set the flag = false; OnLogout click event, just set the flag true and in OnResume() of every activity check if flag is true then call finish().
It works like a charm :) And please If you can't answer at least don't abuse the question.

Resume activity from broadcast receiver

I'm trying to resume an activity from within a broadcast receiver's onReceive() method as follows:
Intent i = new Intent(context, TimerSet.class);
i.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT | Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(i);
However the activity (TimerSet.class) is recreated instead of resumed. The only recommended solution I found to this problem was to use the FLAG_ACTIVITY_REORDER_TO_FRONT but I'm already using it.
Also, using Intent.FLAG_ACTIVITY_NEW_TASK doesn't fit my use case but I get the following exception when I do not provide it:
android:util.AndroidRuntimeException: Calling startActivity() from outside of an
Activity context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you
want?

I am not sure whether this is exactly your problem or not, but I have a situation where I got a notification and I want to start my app without starting a new instance (if it's already running)
I finally figured out that these will work. The FLAG_ACTIVITY_NEW_TASK will not start a new instant if the activity has already been running. However, it will add it to the existing stack. Therefore, we can do a FLAG_ACTIVITY_CLEAR_TOP, so back will bring user to the home screen but not the previous state.
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TOP);

remove FLAG_ACTIVITY_NEW_TASK flag.
also add this flag ->FLAG_ACTIVITY_CLEAR_TOP. This would prevent new activity to be created if already present.

single instance of an activity in android

I know single instance can be achived by setting android:launchMode="singleInstance" in menifest file. but i want to do it on run time . I think it can be achived by setting FLAG but not sure witch one.. plzz help me.. thanks in advance.

In general you can use a combination of Intent.FLAG_ACTIVITY_SINGLE_TOP, Intent.FLAG_ACTIVITY_CLEAR_TOP, Intent.FLAG_ACTIVITY_REORDER_TO_FRONT and Intent.FLAG_ACTIVITY_NEW_TASK to accomplish what you want. However, which one (or ones) to use depends on the situation you have.

This is what u are looking for
Intent intent= new Intent(context, YourActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_SINGLE_TOP);
UPDATE: android:launchMode="singleInstance" may also be needed in Manifest

singleInstance specifies that the launched or recycled activity will be created on a new or existing task, and no other activities can be stacked on top of it. The system will ensure any activities started from it are put on other tasks.
1 task and 1 activity.
There is no intent flag that I know of that will prevent further activities launched by your activity without having to specify flags in all of your new activity's created intents.
So the answer is this is not possible.
Previous posted answers imitate how this will look, but the behavior goes against the specification.

you can achieve singleInstance behaviour with this flags Intent.FLAG_ACTIVITY_MULTIPLE_TASK, Intent.FLAG_ACTIVITY_NEW_TASK