access savedInstanceState outside onCreate

access savedInstanceState outside onCreate

This is my first effort at an android app in native code and I am new to
Java. I have been trying to put together an app with an action bar and a
tabbed interface with v7 support.
My Main.Activity.java looks like this
package com.example.appcompattest;
import android.os.Bundle;
import android.app.Activity;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.view.Menu;
import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBar.Tab;
import android.support.v7.app.ActionBarActivity;
public class MainActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// setup action bar for tabs
ActionBar actionBar = getSupportActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
actionBar.setDisplayShowTitleEnabled(true);
Tab tab = actionBar.newTab()
.setText(R.string.grammar)
.setTabListener(new TabListener<GrammarFragment>(
this, "GRAMMAR", GrammarFragment.class));
actionBar.addTab(tab);
tab = actionBar.newTab()
.setText(R.string.lexis)
.setTabListener(new TabListener<LexisFragment>(
this, "LEXIS", LexisFragment.class));
actionBar.addTab(tab);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
public static class TabListener<T extends Fragment> implements
ActionBar.TabListener {
private Fragment mFragment;
private final Activity mActivity;
private final String mTag;
private final Class<T> 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<T> clz) {
mActivity = activity;
mTag = tag;
mClass = clz;
}
/* The following are each of the ActionBar.TabListener call backs */
public void onTabSelected(Tab tab, 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());
// Commit the transaction
ft.add(R.id.fragment_container, mFragment, mTag);
} else {
// If it exists, simply attach it in order to show it
ft.attach( mFragment);
}
}
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
if (mFragment != null) {
// Detach the fragment, because another one is being attached
ft.detach(mFragment);
}
}
public void onTabReselected(Tab tab, FragmentTransaction ft) {
// User selected the already selected tab. Usually do nothing.
}
}
}
Basically everything works as expected, except when rotating the screen,
which causes a fragment to be added to the view, on top of the one already
present. The solution seems to be to wrap the code in a conditional along
the lines of
if (savedInstanceState == null){
// add fragment
} else {
// do nothing
}
However, as far as I can see, it doen't seem to be possible to access
savedInstanceState outside the onCreate statement. Grateful for any
suggestions.