How/what to use onResume() or onStart in Android

My app consists of 7 activities. For the first time when it has 开发者_如何转开发been installed in a device, I want to show all the activities. When the app has been closed and used later, I want a particular activity to be hidden. How to work out this? Please help me. If I have to use onResume or onStart, how to implement it?

The first time your application is launched set a boolean values such as isLaunched to true using putBoolean(), and then subsequently, when you launch the app, if getBoolean of isLaunched is true, don't show that particular Activity.

You can only show one activity at a time in Android. What were you trying to accomplish by showing seven activities at once? Look into using Views instead of activities. For more information on activities, take a look at the Android Activity Lifecycle (you'll have to scroll to get there).