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    <p>You should probably use a separate <code>Activity</code> for each screen; otherwise you need to end up keeping track of which individual <code>View</code> is currently being displayed, plus the state of all those not currently being displayed when the user switches to another window, or a call comes in etc.</p> <p>It's easier to keep track of this state if you just use a separate <code>Activity</code> for each piece of functionality.</p> <p>If you do decide to keep everything in a single <code>Activity</code> however, you could look at the <a href="http://developer.android.com/reference/android/app/TabActivity.html" rel="nofollow noreferrer"><code>TabActivity</code></a> class. However, there are also caveats there that prevent you from having an <code>Activity</code> as the tab content.</p> <ul> <li><a href="https://stackoverflow.com/questions/1568739/android-why-shouldnt-i-use-activities-inside-tabs">Android: Why shouldn&#39;t I use activities inside tabs?</a></li> </ul> <hr> <p>Regarding your follow-up, you unfortunately cannot attach an <code>Intent</code> directly to a <code>Button</code> like you can with a <code>MenuItem</code> via the XML, however you could just extend <code>Activity</code> to make your own common base class with some code that hooks up the listeners.</p> <p>Something like:</p> <pre><code>public class BaseActivity extends Activity { protected View.OnClickListener mButtonListener; protected void setupHeaderButtons() { findViewById(R.id.header_btn_1).setOnClickListener(mButtonListener); // ... findViewById(R.id.header_btn_n).setOnClickListener(mButtonListener); } } public class FirstActivity extends BaseActivity { @Override public void onCreate(Bundle b) { super.onCreate(b); setContentView(R.layout.first_activity); // This needs to be done *after* the View has been inflated setupHeaderButtons(); } } </code></pre>
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    1. POWhat's the right choice? Create new Activities or just create a different Layout and replace the existing layout?
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    1. USChristopher Orr
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    1. COThx, do you have any comments on my follow-up question above? Should the header have its on Activity, and can I <include> it as I can with a View?
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    2. COI updated my answer. Activities can't include other activies. But an Activity's layout can include other layouts. You would just include header.xml in each Activity's layout XML using the `<include>` tag.
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    3. COThx, for the follow-up answer. I will take a look at it =)
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