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    <p>Question 1: See <a href="http://developer.android.com/reference/android/app/Fragment.html#Lifecycle" rel="nofollow noreferrer">http://developer.android.com/reference/android/app/Fragment.html#Lifecycle</a>:</p> <blockquote> <blockquote> <p>"As a fragment is no longer being used, it goes through a reverse series of callbacks:</p> <p>onPause() - fragment is no longer interacting with the user either because its activity is being paused or a fragment operation is modifying it in the activity.</p> <p>onStop() - fragment is no longer visible to the user either because its activity is being stopped or a fragment operation is modifying it in the activity.</p> <p>onDestroyView() - allows the fragment to clean up resources associated with its View.</p> <p>onDestroy() - called to do final cleanup of the fragment's state.</p> <p>onDetach() - called immediately prior to the fragment no longer being associated with its activity."</p> </blockquote> </blockquote> <p>Question 2: If you must know that it was the back button <strong><em>specifically</em></strong> that is triggering the callbacks, You can capture the back button press in your Fragment's Activity and use your own method to handle it:</p> <pre><code>public class MyActivity extends Activity { //... //Defined in Activity class, so override @Override public void onBackPressed() { super.onBackPressed(); myFragment.onBackPressed(); } } public class MyFragment extends Fragment { //Your created method public void onBackPressed() { //Handle any cleanup you don't always want done in the normal lifecycle } } </code></pre>
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    1. COThis can be used only for cleanup. I think that Mar was to prevent swap fragment from backstack if use press the back button.
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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