Fix crash when pressing back from statistics view and again in overvi…

…ew (#399)

* Fix crash when pressing back from statistics view and again in overview

* AVD cache fix

.github/workflows/compatibilityTest.yml

@@ -37,7 +37,7 @@ jobs:
           path: |
             ~/.android/avd/*
             ~/.android/adb*
-          key: avd-ubuntu-${{ matrix.api-level }}
+          key: avd-${{ matrix.api-level }}
 
       - name: Create AVD and generate snapshot for caching
         if: steps.avd-cache.outputs.cache-hit != 'true'
@@ -62,7 +62,6 @@ jobs:
           disable-animations: true
           profile: ${{ matrix.profile }}
           script: ./gradlew connectedCheck
-          cores: 4
 
       - uses: actions/upload-artifact@v4
         if: always()

app/src/main/java/com/futsch1/medtimer/statistics/StatisticsFragment.java

@@ -80,7 +80,6 @@ private void loadActiveFragment(StatisticFragmentType fragmentType) {
         };
         FragmentTransaction transaction = requireActivity().getSupportFragmentManager().beginTransaction();
         transaction.replace(R.id.container, fragment);
-        transaction.addToBackStack(null);
         transaction.commit();
 
         activeStatisticsFragment.setActiveFragment(fragmentType);