how to apply master page concept in android application?

Question

I want common logout action to all pages in android application.i have common template that contain logout option. but i repeat the logout function to all activity. how to resolve this problem.

Answer 1

The simplest thing would be to extend a common Activity, as someone else suggested. You are able to extends only from one class, that's why you would do something like this:

public class CommonActivity extends Activity {
     // Here you implement log out methods
}

public class ParticularActivity extends CommonActivity {
    // Here you put your particular class variables and methods
}

This way, you have the logout functionality in every activity, all you have to do is extends the common one.

Answer 2

I have done this using XML file.

I am just creating runtime view from XML file, and add it to the Activity layout.

I have created method for that

public static void setLoginview(Context ctx, RelativeLayout layout) {
    LayoutInflater linflater = (LayoutInflater) ctx
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View myView = linflater.inflate(R.layout.loginheader, null);    
    layout.addView(myView);
    try {
        layout.getChildAt(0).setPadding(0, 50, 0, 0);
    } catch (Exception e) {
    }
}

ctx is the application contetx and layout is the layout in which i want to add that view.

Answer 3

Create a Base activity which extends Activity. Write the logic for logout in it. Then extend this class in all activities of the app.

Answer 4

You can either:

• extend Activity class and implement the functionality there, your activities would extend this class to provide same functionality
• use delegation pattern - create some helper class which contains needed functionality

With first approach you will run into problems when you'll need to extend existing Activities in Android (eg ListActivity, TabActivity, etc.)

Check this answer .