PendingIntent getActivity

PendingIntent getActivity Flag:

public static final int  FLAG_CANCEL_CURRENT

 Added in API level 1

Flag indicating that if the described PendingIntent already exists, the current one should be canceled before generating a new one. For use with getActivity(Context, int, Intent, int), getBroadcast(Context, int, Intent, int), and getService(Context, int, Intent, int).

You can use this to retrieve a new PendingIntent when you are only changing the extra data in the Intent; 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.
Constant Value:  268435456 (0x10000000)
 public static final int  FLAG_NO_CREATE
 Added in API level 1

Flag indicating that if the described PendingIntent does not already exist, then simply return null instead of creating it. For use with getActivity(Context, int, Intent, int), getBroadcast(Context, int, Intent, int), and getService(Context, int, Intent, int).
Constant Value:  536870912 (0x20000000)
 public static final int  FLAG_ONE_SHOT
 Added in API level 1

Flag indicating that this PendingIntent can be used only once. For use with getActivity(Context, int, Intent, int), getBroadcast(Context, int, Intent, int), and getService(Context, int, Intent, int).

If set, after send() is called on it, it will be automatically canceled for you and any future attempt to send through it will fail.
Constant Value:  1073741824 (0x40000000)
 public static final int  FLAG_UPDATE_CURRENT
 Added in API level 3

Flag indicating that if the described PendingIntent already exists, then keep it but replace its extra data with what is in this new Intent. For use with getActivity(Context, int, Intent, int), getBroadcast(Context, int, Intent, int), and getService(Context, int, Intent, int).

This can be used if you are creating intents where only the extras change, and don't care that any entities that received your previous PendingIntent will be able to launch it with your new extras even if they are not explicitly given to it.
Constant Value:  134217728 (0x08000000)