i have a Listview which displays list of clients, i have added an onClickListner to Listview so that i can get the detailed information of clicked client.
Li
If I have understood, you want to send some information to another activity to display this information.
You can have a look to the "Intent" in Android. It's used to start a component like an activity and can carry information to this new activity to start.
Intent i = new Intent(ActivityA.this, ActivityB.class);
i.putExtra("CUSTOMER_INFO", customer.getName());
startActivity(i);
Note: If you want to pass a custom object between activities, like for instance a List of custom object :
List<'CustomObject'>
Your custom object class have to implement Parcelable.