bug fix in main activity: cannot open the same fragment again.

src/de/tudarmstadt/informatik/hostage/ui2/activity/MainActivity.java

@@ -51,6 +51,7 @@ public class MainActivity extends Activity {
 	private CharSequence mTitle;
 
 	public Fragment displayedFragment;
+    private int selectedMenuItemPosition;
 
 	private ArrayList<DrawerListItem> drawerItems;
 	private HoneyService mHoneyService;
@@ -66,7 +67,7 @@ public class MainActivity extends Activity {
 	protected void onCreate(Bundle savedInstanceState) {
 		super.onCreate(savedInstanceState);
 		MainActivity.context = getApplicationContext();
-
+        this.selectedMenuItemPosition = 0;
 
 		setContentView(R.layout.activity_drawer_main);
 
@@ -176,9 +177,18 @@ public class MainActivity extends Activity {
 	}
 
 	private void displayView(int position) {
-		// update the main content by replacing fragments
-		Fragment fragment = null;
-		switch (position) {
+        // DONT OPEN SAME VIEW AGAIN
+        int menuItemPosition = position;
+
+        Fragment fragment = null;
+
+        if (this.selectedMenuItemPosition == position &&  this.displayedFragment != null) {
+            menuItemPosition = -1;
+            fragment = this.displayedFragment;
+        }
+
+        // update the main content by replacing fragments
+		switch (menuItemPosition) {
 			case 0:
 				fragment = new HomeFragment();
 				break;
@@ -201,20 +211,22 @@ public class MainActivity extends Activity {
 		}
 
 		if (fragment != null) {
-			this.displayedFragment = fragment;
-			FragmentManager fragmentManager = getFragmentManager();
-
-			FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
-			fragmentTransaction.replace(R.id.content_frame, fragment, fragment.getTag());
-			fragmentTransaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
-			fragmentTransaction.commit();
-
-			// update selected item and title, then close the drawer
-			mDrawerList.setItemChecked(position, true);
-			mDrawerList.setSelection(position);
-			setTitle(drawerItems.get(position).text);
-			mDrawerLayout.closeDrawer(mDrawerList);
-		}
+			// update selected item and title, then close the drawer if needed
+            if (!fragment.equals(this.displayedFragment)){
+                FragmentManager fragmentManager = getFragmentManager();
+                FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
+                fragmentTransaction.replace(R.id.content_frame, fragment, fragment.getTag());
+                fragmentTransaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
+                fragmentTransaction.commit();
+			    mDrawerList.setItemChecked(position, true);
+			    mDrawerList.setSelection(position);
+			    setTitle(drawerItems.get(position).text);
+                this.selectedMenuItemPosition = position;
+            }
+
+            mDrawerLayout.closeDrawer(mDrawerList);
+            this.displayedFragment = fragment;
+        }
 	}
 
 	public Intent getServiceIntent() {