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POFragment Navigation Inside a Tabbed Action Bar
 

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    <p><strong>The Problem</strong></p> <p>Before I describe my current setup I will describe my problem. I need to have hierarchal navigation between fragments inside separate tabs. Say I drill down on level in a tab, I then switch tabs and then go back to the first, original tab, I need it to be on the drilled down level and then have the ability to go back up to the top level of that tab.</p> <p><strong>Now onto my setup.</strong></p> <p>I have an application with one activity called <code>MainActivity</code>. This activity is what controls my tabbed action bar. I have followed many different tutorials to handle the switching of Fragments when a tab is selected and here is the code below that works drawing your attention to the <code>onTabSelected</code> and <code>onTabUnselected</code> methods.</p> <p><strong>MainActivity -- Tab Listener</strong></p> <pre><code>public static class MyTabListener&lt;T extends Fragment&gt; implements ActionBar.TabListener { private final Activity mActivity; private final String mTag; private final Class&lt;T&gt; mClass; private final Bundle mArgs; private Fragment mFragment; public MyTabListener(Activity activity, String tag, Class&lt;T&gt; clz) { this(activity, tag, clz, null); } public MyTabListener(Activity activity, String tag, Class&lt;T&gt; clz, Bundle args) { mActivity = activity; mTag = tag; mClass = clz; mArgs = args; // Check to see if we already have a fragment for this tab, probably // from a previously saved state. If so, deactivate it, because our // initial state is that a tab isn't shown. mFragment = mActivity.getFragmentManager().findFragmentByTag(mTag); if (mFragment != null &amp;&amp; !mFragment.isDetached()) { FragmentTransaction ft = mActivity.getFragmentManager().beginTransaction(); ft.detach(mFragment); ft.commit(); } } public void onTabSelected(Tab tab, FragmentTransaction ft) { Log.e("FRAGMENT","Selected Fragment With Tag " + mTag); if (mFragment == null) { mFragment = Fragment.instantiate(mActivity, mClass.getName(), mArgs); ft.add(android.R.id.content, mFragment, mTag); } else { ft.attach(mFragment); } } public void onTabUnselected(Tab tab, FragmentTransaction ft) { if (mFragment != null) { ft.detach(mFragment); } } public void onTabReselected(Tab tab, FragmentTransaction ft) { Toast.makeText(mActivity, "Reselected!", Toast.LENGTH_SHORT).show(); } } </code></pre> <p>When I am on <code>Tab1</code> viewing <code>Fragment1', when a button is pressed I then show another</code>Fragment<code>called</code>Fragment2` which I need the ability to go back from. The code below works if I just stay on that tab however when navigating away from the tab and back to it, everything messes up.</p> <p><strong>MainActivity -- Showing second fragment</strong></p> <pre><code>Fragment tdFrag = Fragment.instantiate(this, SecondFragment.class.getName()); FragmentTransaction ft = getFragmentManager().beginTransaction(); ft.replace(android.R.id.content, tdFrag, "secondfrag"); ft.addToBackStack(null); ft.commit(); </code></pre> <p><strong>My Thoughts</strong></p> <p>I think it must be the way I detach the fragments and handle the switching over when a new tab is pressed. Maybe I need to implement some way of storing each individual backstack for each tab and loading the fragments from that instead of the system back stack?</p> <p>Any help would be great. I have tried to explain it as thoroughly and simply as possible.</p> <p>Thanks in advance.</p>
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