fix: add PR kaushikgopal#13 from @SherifMakhlouf

Kaushik Gopal · Kaushik Gopal · commit debe574b1c1c · 2015-05-12T16:26:36.000-07:00
diff --git a/app/src/main/java/com/morihacky/android/rxjava/MainActivity.java b/app/src/main/java/com/morihacky/android/rxjava/MainActivity.java
@@ -27,9 +27,11 @@ protected void onCreate(Bundle savedInstanceState) {
 
         Timber.plant(new Timber.DebugTree());
 
-        getSupportFragmentManager().beginTransaction()
-              .addToBackStack(this.toString())
-              .replace(R.id.activity_main, new MainFragment(), this.toString())
-              .commit();
+	    if(savedInstanceState == null){
+    	  getSupportFragmentManager().beginTransaction()
+        	  .addToBackStack(this.toString())
+	          .replace(R.id.activity_main, new MainFragment(), this.toString())
+   	       .commit();
+		}
     }
-}
+}
