Retrieve unread sms in Android

    In order to get unread sms messages in an Android application you need to setup a filter "read = 0" as shown below. 

Retrieve sms messages on a particular date in Android

    In order to get sms messages received on a particular date in an Android application you need to setup a filter which selects messages on the basis of date comparison as shown below.

Android activities hierarchy

In this post I will mention couple of ways to make sure that parent / child relationship is maintained between activities. This is essential to make sure that the system knows which activity to start when Up is pressed on phone or action bar.