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  1. PO
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    <p>For my point of view the best solution here is to delegate logic to some class, let's call it <code>CustomActivityLogic</code>.</p> <p>Also you need to create common interface (<code>CustomActivity</code>) for your activities if you want to access some data or methods of activity classes from your logic class.</p> <p>To call protected virtual overridden methods there are two solutions: </p> <ul> <li>call method of supper from overridden method</li> <li>make a new method in subclass and call super method from this new method. Call new method from shared logic.</li> </ul> <p><strong>CustomActivity.java</strong></p> <pre><code>public interface CustomActivity { void someMethod(); } </code></pre> <p><strong>Activiti.java</strong></p> <pre><code>import android.app.Activity public class Activiti extends Activity implements CustomActivity { private CustomActivityLogic logic = new CustomActivityLogic(); public void someMethod() { /***/ } public void myNewMethod() { logic.myNewMethod(this); } @Override protected void onCreate(Bundle savedInstanceState) { logic.onCreate(this, savedInstanceState); // call shared logic super.onCreate(savedInstanceState); // call super } } </code></pre> <p><strong>FragmentActivitii.java</strong></p> <pre><code>import android.support.v4.app.FragmentActivity; public class FragmentActivitii extends FragmentActivity implements CustomActivity { private CustomActivityLogic logic = new CustomActivityLogic(); public void someMethod() { /***/ } public void myNewMethod() { logic.myNewMethod(this); } @Override protected void onCreate(Bundle savedInstanceState) { logic.onCreate(this, savedInstanceState); // call shared logic super.onCreate(savedInstanceState); // call super } } </code></pre> <p><strong>CustomActivityLogic.java</strong></p> <pre><code> public class CustomActivityLogic { public void myNewMethod(CustomActivity activity) { /*...*/ } public void onCreate(Activity activity, Bundle savedInstanceState) { /* shared creation logic */ } } </code></pre> <p><strong>Approach with making onCreate available to call from outside via <code>CustomActivity</code> interface</strong></p> <p><strong>CustomActivity.java</strong></p> <pre><code>public interface CustomActivity { void someMethod(); void onCreateSuper(Bundle savedInstanceState); } </code></pre> <p><strong>Activiti.java</strong></p> <pre><code>import android.app.Activity public class Activiti extends Activity implements CustomActivity { private CustomActivityLogic logic = new CustomActivityLogic(); public void someMethod() { /***/ } public void myNewMethod() { logic.myNewMethod(this); } @Override protected void onCreate(Bundle savedInstanceState) { logic.onCreate(this, savedInstanceState); // call shared logic } public void onCreateSuper(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // call super } } </code></pre> <p><strong>FragmentActivitii.java</strong></p> <pre><code>import android.support.v4.app.FragmentActivity; public class FragmentActivitii extends FragmentActivity implements CustomActivity { private CustomActivityLogic logic = new CustomActivityLogic(); public void someMethod() { /***/ } public void myNewMethod() { logic.myNewMethod(this); } @Override protected void onCreate(Bundle savedInstanceState) { logic.onCreate(this, savedInstanceState); // call shared logic } public void onCreateSuper(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // call super } } </code></pre> <p><strong>CustomActivityLogic.java</strong></p> <pre><code> public class CustomActivityLogic { public void myNewMethod(CustomActivity activity) { /*...*/ } public void onCreate(CustomActivity activity, Bundle savedInstanceState) { /* shared creation logic */ activity.onCreateSuper(savedInstanceState); // call-back super } } </code></pre>
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    1. POAdding Functionality to both Android's Activity (parent class) and FragmentActivity (child class) in best coding style (minimal duplication)
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    1. COThanks @hazzik!! This is a nice solution. How about if i have to override some methods in `Activiti extends Activity`, i still have to explicitly override them in `FragmentActiviti extends FragmentActivity`?
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    2. COYes, you need to do similar to `myNewMethod`
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    3. CODear @hazzik, i am trying your approach and edited it on my question. Could you please have a look?
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