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We will introduce Fragment life cycle methods in another article later.Ģ. The below diagram illustrates the relationship between activity and fragment life cycle.So Fragment life cycle is similar to the Activity life cycle. Each Fragment also has its own life cycle.Each Fragment can have its own layout XML file, can contain its own view objects and encapsulate its own functionality.One Html can contain multiple Frames, and one Activity can include multiple Fragments. The fragment is something like Frame in Html.How can we make the app to adapt both small size and big size android devices use only one activity? We can use android Fragments to implement this. But for big size android devices, the screen size is big, both the title list and the detailed content can be displayed in one panel only use one activity. For a small size android device ( android phone ), there are not so many spaces, so it will use only one panel to display content for different views ( title view, content view), each view can be implemented by one activity.