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    <p>The way you are doing your 'TAB' implementation is totally wrong. First of all, you should use <code>FrameLayout</code> as parent view to add/replace your <code>Fragments</code>. Second thing is that the logic in <code>onTabSelected</code> should be changed. Here is an example which is the proper way to use Tab Navigation in ActionBar. </p> <p>First create your main.xml, where your Fragments will be added/attached :</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/fragment_container" android:layout_width="match_parent" android:layout_height="match_parent" /&gt; </code></pre> <p>Second you can create your tabs and add <code>TabListener</code> to them :</p> <pre><code>mMyActionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); ActionBar.Tab mFirstTab = mMyActionBar.newTab(); mFirstTab.setText("First Tab"); mFirstTab.setTabListener(this); mMyActionBar.addTab(mFirstTab); ActionBar.Tab mSecondTab = mMyActionBar.newTab(); mSecondTab.setText("Second Tab"); mSecondTab.setTabListener(this); mMyActionBar.addTab(mSecondTab); ActionBar.Tab mThirdTab = mMyActionBar.newTab(); mThirdTab.setText("Third Tab"); mThirdTab.setTabListener(this); mMyActionBar.addTab(mThirdTab); </code></pre> <p>and create your TabListener like this :</p> <pre><code>public void onTabSelected(Tab tab, FragmentTransaction ft) { // Check if the fragment is already initialized if (mFirstTab == null) { // If not, instantiate and add it to the activity mFirstTab = Fragment.instantiate(mActivity, mClass.getName()); ft.add(android.R.id.content, mFirstTab, mTag); } else { // If it exists, simply attach it in order to show it ft.attach(mFirstTab); } } public void onTabUnselected(Tab tab, FragmentTransaction ft) { if (mFirstTab != null) { // Detach the fragment, because another one is being attached ft.detach(mFirstTab); } } public void onTabReselected(Tab tab, FragmentTransaction ft) { // User selected the already selected tab. Usually do nothing. } </code></pre> <p>And about <code>NullPointerException</code> in your code, as I can see your <code>EditText</code> : <code>textBox = (EditText)findViewById(R.id.editText1);</code> which you are trying to use in your <code>MainActivity</code> is declared in your third's tab layout. This <code>EditText</code> should be declared and used in your <code>FragMent3</code>, not in <code>MainActivity</code> .</p> <p>Hope this answer help you!</p>
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    1. COThanks, but I have problems with impelemnting your code. I get a lot of errors. What about this example? http://getquery.com/android-fragment-tab-example/ it's very simple and works. Btw, I want manage all tab components in MainActivity not in fragment class, is this wrong?
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    2. CONo, you can manage your tabs in Activity too and about the code, you just need to do it in your way, I am just pointing you how to achieve this. The code depends much on the way you are creating your Fragments and how you are instantiating them. About the example which you gave me, it's using `TabHost`, not ActionBar Tabs. So it depends which tabs you want to use, ActionBar or TabHost?
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    3. COI just need three tabs in my app, each tab will have some UI components, which I will update them from MainActivity. When I started to read about tabs, I read that TabActivity is now deprecated, so I need substitute for that. But with my lack of knowledge of object programming I'm litlle bit lost in a lot of examples and tutorials on net. TabHost is not deprecated, right? Thanks for help!
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