Clarification on the docs for PendingIntent.FLAG_CANCEL_CURRENT
android
Solution
Once you create a new `PendingIntent` with `FLAG_CANCEL_CURRENT`, anything holding a previous `PendingIntent` for the same `Intent` will no longer be able to execute that original `PendingIntent`.
For example, suppose we have this:
Intent i=new Intent(this, Foo.class);
i.putExtra("key", 1);
PendingIntent pi=PendingIntent.getActivity(this, 0, i, 0);
and we use that `PendingIntent` with, say, a `Notification`.
Later on, we execute:
Intent i=new Intent(this, Foo.class);
i.putExtra("key", 2);
PendingIntent pi2=PendingIntent.getActivity(this, 0, i, PendingIntent.FLAG_CANCEL_CURRENT);
At this point, the `PendingIntent` created originally (`pi`) is no longer valid, and whatever we use `pi2` for will see the updated extra value (`2`).
If, instead, we did:
Intent i=new Intent(this, Foo.class);
i.putExtra("key", 2);
PendingIntent pi2=PendingIntent.getActivity(this, 0, i, PendingIntent.FLAG_UPDATE_CURRENT);
At this point, `pi` and `pi2` both represent the same `PendingIntent`, and both will see the updated extra value (`2`).
Or, if we did:
Intent i=new Intent(this, Foo.class);
i.putExtra("key", 2);
PendingIntent pi2=PendingIntent.getActivity(this, 0, i, 0);
At this point, `pi` and `pi2` still represent the same `PendingIntent`, but the extras are unchanged, as `getActivity()` returns the original `PendingIntent` without applying the new extras.
Most times, `FLAG_UPDATE_CURRENT` is a fine answer when you are trying to replace extras inside a `PendingIntent`.
Problem
From the documentation of Pending Intent `FLAG_CANCEL_CURRENT` in Android: by canceling the previous pending intent, this ensures that only entities given the new data will be able to launch it. If this assurance is not an issue, consider FLAG_UPDATE_CURRENT Can anyone explain what this line means?