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    <p>Take a look on life cycle of Activity <img src="https://i.stack.imgur.com/Jk8de.png" alt="enter image description here"></p> <p>Where </p> <pre><code>***onCreate()*** </code></pre> <p>Called when the activity is first created. This is where you should do all of your normal static set up: create views, bind data to lists, etc. This method also provides you with a Bundle containing the activity's previously frozen state, if there was one. Always followed by onStart().</p> <pre><code>***onStart()*** </code></pre> <p>Called when the activity is becoming visible to the user. Followed by onResume() if the activity comes to the foreground, or onStop() if it becomes hidden.</p> <p>And you can write your simple class to take a look when these methods call</p> <pre><code>public class TestActivity extends Activity { /** Called when the activity is first created. */ private final static String TAG = "TestActivity"; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Log.i(TAG, "On Create ....."); } /* (non-Javadoc) * @see android.app.Activity#onDestroy() */ @Override protected void onDestroy() { super.onDestroy(); Log.i(TAG, "On Destroy ....."); } /* (non-Javadoc) * @see android.app.Activity#onPause() */ @Override protected void onPause() { super.onPause(); Log.i(TAG, "On Pause ....."); } /* (non-Javadoc) * @see android.app.Activity#onRestart() */ @Override protected void onRestart() { super.onRestart(); Log.i(TAG, "On Restart ....."); } /* (non-Javadoc) * @see android.app.Activity#onResume() */ @Override protected void onResume() { super.onResume(); Log.i(TAG, "On Resume ....."); } /* (non-Javadoc) * @see android.app.Activity#onStart() */ @Override protected void onStart() { super.onStart(); Log.i(TAG, "On Start ....."); } /* (non-Javadoc) * @see android.app.Activity#onStop() */ @Override protected void onStop() { super.onStop(); Log.i(TAG, "On Stop ....."); } } </code></pre> <p>Hope this will clear your confusion.</p> <p>And take a look <a href="http://developer.android.com/reference/android/app/Activity.html" rel="noreferrer">here</a> for details.</p> <p><strong><em><a href="http://eagle.phys.utk.edu/guidry/android/lifecycleMethods.html" rel="noreferrer">Lifecycle Methods in Details</a> is a very good example and demo application, which is a very good article to understand the life cycle.</em></strong></p>
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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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