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POCombining Fragments and ActionBar in Android level < 13. Is there a feasible way?
 

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    <p>I would like to write my project in the lowest possible Android version for my reqs, which is 11.</p> <p>But I need Fragment.attach and ActionBars.</p> <p>Since level 11 does not include Fragment.attach I import the support package for v4.</p> <p>But now the problem is that the TabListerner for the ActionTab does not use the v4 Fragment but rather the level 11 Fragment. Casting won't work.</p> <p>Do I really need to switch to level 13 or is there a feasible solution to implement all this in level 11.</p> <p>Here is the code:</p> <pre><code>import android.app.ActionBar; import android.app.Activity; import android.support.v4.app.FragmentActivity; import android.support.v4.app.FragmentTransaction; import android.support.v4.app.Fragment; import android.app.ActionBar.Tab; import android.app.ActionBar.TabListener; import android.os.Bundle; import android.support.v4.app.Fragment; public class TestActivity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); } public static class TabListener&lt;T extends android.support.v4.app.Fragment&gt; /* to make sure it take the Fragment from the support package! */ implements ActionBar.TabListener { private Fragment mFragment; private final Activity mActivity; private final String mTag; private final Class&lt;T&gt; mClass; /** * Constructor used each time a new tab is created. * * @param activity * The host Activity, used to instantiate the fragment * @param tag * The identifier tag for the fragment * @param clz * The fragment's Class, used to instantiate the fragment */ public TabListener(Activity activity, String tag, Class&lt;T&gt; clz) { mActivity = activity; mTag = tag; mClass = clz; } /* The following are each of the ActionBar.TabListener callbacks */ public void onTabSelected(Tab tab, android.support.v4.app.FragmentTransaction ft) { // Check if the fragment is already initialized if (mFragment == null) { // If not, instantiate and add it to the activity mFragment = Fragment.instantiate(mActivity, mClass.getName()); ft.add(android.R.id.content, mFragment, mTag); } else { // If it exists, simply attach it in order to show it ft.attach(mFragment); } } /* these are NOT the implementation of the TabListener above, since the use the * * the FragmentTransactionof the support package and not of level 11 * */ public void onTabUnselected(Tab tab, android.support.v4.app.FragmentTransaction ft) { if (mFragment != null) { // Detach the fragment, because another one is being attached ft.detach(mFragment); } } public void onTabReselected(Tab tab, android.support.v4.app.FragmentTransaction ft) { // User selected the already selected tab. Usually do nothing. } /* these are added since they belong to the above definition of TabListener * * unfortunately the use the FragmentTransaction of level 11, not the one of the support package! * */ @Override public void onTabSelected(Tab tab, android.app.FragmentTransaction ft) { } @Override public void onTabReselected(Tab tab, android.app.FragmentTransaction ft) { } @Override public void onTabUnselected(Tab tab, android.app.FragmentTransaction ft) { } } } </code></pre>
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    1. COUpdate: it seems there is no way to get the new ActionBar AND the Fragments.attach methods work correctly in levels < 13. I ended up finding alternative methods sticking to level 11.
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