Avoid fragment being created twice

Avoid fragment being created twice. Proposal to solve jfeinstein10#336

Author: yccheok

example/src/com/slidingmenu/example/BaseActivity.java

@@ -33,10 +33,14 @@ public void onCreate(Bundle savedInstanceState) {
 
 		// set the Behind View
 		setBehindContentView(R.layout.menu_frame);
-		FragmentTransaction t = this.getSupportFragmentManager().beginTransaction();
-		mFrag = new SampleListFragment();
-		t.replace(R.id.menu_frame, mFrag);
-		t.commit();
+		if (savedInstanceState == null) {
+			FragmentTransaction t = this.getSupportFragmentManager().beginTransaction();
+			mFrag = new SampleListFragment();
+			t.replace(R.id.menu_frame, mFrag);
+			t.commit();
+		} else {
+			mFrag = (ListFragment)this.getSupportFragmentManager().findFragmentById(R.id.menu_frame);
+		}
 
 		// customize the SlidingMenu
 		SlidingMenu sm = getSlidingMenu();