I will do your searching for you ;)

Intent:
"An intent is an abstract description of an operation to be performed.
It can be used with startActivity to launch an Activity,
broadcastIntent to send it to any interested BroadcastReceiver
components, and startService(Intent) or bindService(Intent,
ServiceConnection, int) to communicate with a background Service. "
http://developer.android.com/reference/android/content/Intent.html

PendingIntent:
"By giving a PendingIntent to another application, you are granting it
the right to perform the operation you have specified as if the other
application was yourself (with the same permissions and identity). As
such, you should be careful about how you build the PendingIntent:
often, for example, the base Intent you supply will have the component
name explicitly set to one of your own components, to ensure it is
ultimately sent there and nowhere else. "
http://developer.android.com/reference/android/app/PendingIntent.html

Lifecycle:
http://developer.android.com/guide/topics/fundamentals.html#lcycles

Now all you have to do is read the docs :)

--
RichardC
On Oct 27, 2:35 pm, saurabh sinha <saurso...@gmail.com> wrote:
> please tell me what are the lifeycle of android
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