Android: Clear Activity Stack

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Most of you are wrong. If you want to close existing activity stack regardless of what’s in there and create new root, correct set of flags is the following:

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

From the doc:

public static final int FLAG_ACTIVITY_CLEAR_TASK
Added in API level 11

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. That is, the activity becomes the new root of an
otherwise empty task, and any old activities are finished. This can
only be used in conjunction with FLAG_ACTIVITY_NEW_TASK.

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