Cherrypick for hotfix3.1 (#4205)

* Fixes #4159 On Explore Tab, All Available Options on toolbar in media detail view are only targeting the first media in the list.

Fixes #4159 On Explore Tab, All Available Options on toolbar in media detail view are only targeting the first media in the list.

* fixed bug: App crashes on viewing review in Review Fragment #4132 (#4146)

* fixed bug:app crashes on viewing review in Review Fragment #4135

* Fixed the issue with back button in contribution tab. (#4177)

Co-authored-by: Pratham2305 <Pratham2305@users.noreply.github.com>

* Fixed the issue with back navigation button on toolbar in explore tab. (#4175)

* Fix (#4148) Issues on theme change

* fixed themeChange crashes

* fixed comments

* Overlooked the title bar

Co-authored-by: Pratham Pahariya <54663429+Pratham2305@users.noreply.github.com>
Co-authored-by: Shabir Ahmad <56585337+shabar-shab@users.noreply.github.com>
Co-authored-by: Pratham2305 <Pratham2305@users.noreply.github.com>
Co-authored-by: Aditya-Srivastav <54016427+4D17Y4@users.noreply.github.com>

app/src/main/java/fr/free/nrw/commons/bookmarks/BookmarkListRootFragment.java

@@ -38,6 +38,10 @@ public class BookmarkListRootFragment extends CommonsDaggerSupportFragment imple
   @BindView(R.id.explore_container)
   FrameLayout container;
 
+  public BookmarkListRootFragment(){
+    //empty constructor necessary otherwise crashes on recreate
+  }
+
   public BookmarkListRootFragment(Bundle bundle, BookmarksPagerAdapter bookmarksPagerAdapter) {
     String title = bundle.getString("categoryName");
     int order = bundle.getInt("order");
@@ -65,7 +69,9 @@ public class BookmarkListRootFragment extends CommonsDaggerSupportFragment imple
   @Override
   public void onViewCreated(@NonNull final View view, @Nullable final Bundle savedInstanceState) {
     super.onViewCreated(view, savedInstanceState);
-    setFragment(listFragment, mediaDetails);
+    if(savedInstanceState==null) {
+      setFragment(listFragment, mediaDetails);
+    }
   }
 
   public void setFragment(Fragment fragment, Fragment otherFragment) {

app/src/main/java/fr/free/nrw/commons/contributions/ContributionsFragment.java

@@ -286,13 +286,13 @@ public class ContributionsFragment
                 nearbyNotificationCardView.setVisibility(View.GONE);
             }
         }
-        showFragment(contributionsListFragment, CONTRIBUTION_LIST_FRAGMENT_TAG);
+        showFragment(contributionsListFragment, CONTRIBUTION_LIST_FRAGMENT_TAG, mediaDetailPagerFragment);
     }
 
     private void showMediaDetailPagerFragment() {
         // hide nearby card view on media detail is visible
         setupViewForMediaDetails();
-        showFragment(mediaDetailPagerFragment, MEDIA_DETAIL_PAGER_FRAGMENT_TAG);
+        showFragment(mediaDetailPagerFragment, MEDIA_DETAIL_PAGER_FRAGMENT_TAG, contributionsListFragment);
     }
 
     private void setupViewForMediaDetails() {
@@ -329,7 +329,7 @@ public class ContributionsFragment
             showContributionsListFragment();
         }
 
-        showFragment(contributionsListFragment, CONTRIBUTION_LIST_FRAGMENT_TAG);
+        showFragment(contributionsListFragment, CONTRIBUTION_LIST_FRAGMENT_TAG, mediaDetailPagerFragment);
     }
 
     /**
@@ -337,15 +337,44 @@ public class ContributionsFragment
      *
      * @param fragment
      * @param tag
+     * @param otherFragment
      */
-    private void showFragment(Fragment fragment, String tag) {
+    private void showFragment(Fragment fragment, String tag, Fragment otherFragment) {
         FragmentTransaction transaction = getChildFragmentManager().beginTransaction();
-        transaction.replace(R.id.root_frame, fragment, tag);
+        if (fragment.isAdded() && otherFragment != null) {
-        transaction.addToBackStack(CONTRIBUTION_LIST_FRAGMENT_TAG);
+            transaction.hide(otherFragment);
-        transaction.commit();
+            transaction.show(fragment);
+            transaction.addToBackStack(CONTRIBUTION_LIST_FRAGMENT_TAG);
+            transaction.commit();
+            getChildFragmentManager().executePendingTransactions();
+        } else if (fragment.isAdded() && otherFragment == null) {
+            transaction.show(fragment);
+            transaction.addToBackStack(CONTRIBUTION_LIST_FRAGMENT_TAG);
+            transaction.commit();
+            getChildFragmentManager().executePendingTransactions();
+        }else if (!fragment.isAdded() && otherFragment != null ) {
+            transaction.hide(otherFragment);
+            transaction.add(R.id.root_frame, fragment, tag);
+            transaction.addToBackStack(CONTRIBUTION_LIST_FRAGMENT_TAG);
+            transaction.commit();
+            getChildFragmentManager().executePendingTransactions();
+        } else if (!fragment.isAdded()) {
+            transaction.replace(R.id.root_frame, fragment, tag);
+            transaction.addToBackStack(CONTRIBUTION_LIST_FRAGMENT_TAG);
+            transaction.commit();
+            getChildFragmentManager().executePendingTransactions();
+        }
+    }
+
+    public void removeFragment(Fragment fragment) {
+        getChildFragmentManager()
+            .beginTransaction()
+            .remove(fragment)
+            .commit();
         getChildFragmentManager().executePendingTransactions();
     }
 
+
     public Intent getUploadServiceIntent(){
         Intent intent = new Intent(getActivity(), UploadService.class);
         intent.setAction(UploadService.ACTION_START_SERVICE);
@@ -620,7 +649,8 @@ public class ContributionsFragment
             } else {
                 nearbyNotificationCardView.setVisibility(View.GONE);
             }
-            getChildFragmentManager().popBackStack();
+            removeFragment(mediaDetailPagerFragment);
+            showFragment(contributionsListFragment, CONTRIBUTION_LIST_FRAGMENT_TAG, mediaDetailPagerFragment);
             ((BaseActivity)getActivity()).getSupportActionBar().setDisplayHomeAsUpEnabled(false);
             ((MainActivity)getActivity()).showTabs();
             fetchCampaigns();

app/src/main/java/fr/free/nrw/commons/contributions/MainActivity.java

@@ -110,11 +110,18 @@ public class MainActivity  extends BaseActivity
         setContentView(R.layout.main);
         ButterKnife.bind(this);
         setSupportActionBar(toolbar);
+        toolbar.setNavigationOnClickListener(view -> {
+            onSupportNavigateUp();
+        });
         if (applicationKvStore.getBoolean("login_skipped") == true) {
             setTitle(getString(R.string.explore_tab_title_mobile));
             setUpLoggedOutPager();
         } else {
-            setTitle(getString(R.string.contributions_fragment));
+            if(savedInstanceState == null){
+                //starting a fresh fragment.
+                setTitle(getString(R.string.contributions_fragment));
+                loadFragment(ContributionsFragment.newInstance(),false);
+            }
             setUpPager();
             initMain();
         }
@@ -125,30 +132,31 @@ public class MainActivity  extends BaseActivity
     }
 
     private void setUpPager() {
-        loadFragment(ContributionsFragment.newInstance());
         tabLayout.setOnNavigationItemSelectedListener(item -> {
             if (!item.getTitle().equals("More")) {
                 // do not change title for more fragment
                 setTitle(item.getTitle());
             }
             Fragment fragment = NavTab.of(item.getOrder()).newInstance();
-            return loadFragment(fragment);
+            return loadFragment(fragment,true);
         });
     }
 
     private void setUpLoggedOutPager() {
-        loadFragment(ExploreFragment.newInstance());
+        loadFragment(ExploreFragment.newInstance(),false);
         tabLayout.setOnNavigationItemSelectedListener(item -> {
             if (!item.getTitle().equals("More")) {
                 // do not change title for more fragment
                 setTitle(item.getTitle());
             }
             Fragment fragment = NavTabLoggedOut.of(item.getOrder()).newInstance();
-            return loadFragment(fragment);
+            return loadFragment(fragment,true);
         });
     }
 
-    private boolean loadFragment(Fragment fragment) {
+    private boolean loadFragment(Fragment fragment,boolean showBottom ) {
+        //showBottom so that we do not show the bottom tray again when constructing
+        //from the saved instance state.
         if (fragment instanceof ContributionsFragment) {
             if (activeFragment == ActiveFragment.CONTRIBUTIONS) { // Do nothing if same tab
                 return true;
@@ -173,7 +181,7 @@ public class MainActivity  extends BaseActivity
             }
             bookmarkFragment = (BookmarkFragment) fragment;
             activeFragment = ActiveFragment.BOOKMARK;
-        } else if (fragment == null) {
+        } else if (fragment == null && showBottom) {
             if (applicationKvStore.getBoolean("login_skipped") == true) { // If logged out, more sheet is different
                 MoreBottomSheetLoggedOutFragment bottomSheet = new MoreBottomSheetLoggedOutFragment();
                 bottomSheet.show(getSupportFragmentManager(),

app/src/main/java/fr/free/nrw/commons/explore/ExploreListRootFragment.java

@@ -34,6 +34,10 @@ public class ExploreListRootFragment extends CommonsDaggerSupportFragment implem
   @BindView(R.id.explore_container)
   FrameLayout container;
 
+  public ExploreListRootFragment(){
+    //empty constructor necessary otherwise crashes on recreate
+  }
+
   public ExploreListRootFragment(Bundle bundle) {
     String title = bundle.getString("categoryName");
     listFragment = new CategoriesMediaFragment();
@@ -55,7 +59,9 @@ public class ExploreListRootFragment extends CommonsDaggerSupportFragment implem
   @Override
   public void onViewCreated(@NonNull final View view, @Nullable final Bundle savedInstanceState) {
     super.onViewCreated(view, savedInstanceState);
-    setFragment(listFragment, mediaDetails);
+    if(savedInstanceState == null) {
+      setFragment(listFragment, mediaDetails);
+    }
   }
 
   public void setFragment(Fragment fragment, Fragment otherFragment) {
@@ -110,7 +116,8 @@ public class ExploreListRootFragment extends CommonsDaggerSupportFragment implem
     Log.d("deneme8","on media clicked");
     container.setVisibility(View.VISIBLE);
     ((ExploreFragment)getParentFragment()).tabLayout.setVisibility(View.GONE);
-    mediaDetails = new MediaDetailPagerFragment(false, true, position);
+    mediaDetails = new MediaDetailPagerFragment(false, true);
+    mediaDetails.showImage(position);
     setFragment(mediaDetails, listFragment);
   }
 

app/src/main/java/fr/free/nrw/commons/review/ReviewImageFragment.java

@@ -115,7 +115,7 @@ public class ReviewImageFragment extends CommonsDaggerSupportFragment {
 
                 //Get existing user name if it is already saved using savedInstanceState else get from reviewController
                 if (savedInstanceState == null) {
-                    if (getReviewActivity().reviewController != null) {
+                    if (getReviewActivity().reviewController.firstRevision != null) {
                         user = getReviewActivity().reviewController.firstRevision.getUser();
                     }
                 } else {