fix: back button moves up a folder instead of closing app

opencloudApp/src/main/java/eu/opencloud/android/presentation/files/filelist/MainFileListFragment.kt

@@ -1008,6 +1008,7 @@ class MainFileListFragment : Fragment(),
                 (newFileListOption.isSharedByLink() && currentFolder.remotePath != ROOT_PATH)
         if (!isFabSupportedView || isPickingAFolder() ||
             (!currentFolder.hasAddFilePermission && !currentFolder.hasAddSubdirectoriesPermission)) {
+            collapseFab()
             toggleFabVisibility(false)
         } else {
             toggleFabVisibility(true)
@@ -1128,10 +1129,9 @@ class MainFileListFragment : Fragment(),
             fabNewfile.isFocusable = false
             fabNewshortcut.isFocusable = false
         }
-
     }
 
-    fun isFabExpanded() = binding.fabMain.isExpanded
+    fun isFabExpanded() = binding.fabMain.isVisible && binding.fabMain.isExpanded
 
     fun setFabMainContentDescription() {
         binding.fabMain.findViewById<AddFloatingActionButton>(com.getbase.floatingactionbutton.R.id.fab_expand_menu_button).contentDescription =

opencloudApp/src/main/java/eu/opencloud/android/ui/activity/FileDisplayActivity.kt

@@ -50,6 +50,7 @@ import android.widget.FrameLayout
 import android.widget.LinearLayout
 import android.widget.ScrollView
 import android.widget.TextView
+import androidx.activity.OnBackPressedCallback
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.appcompat.app.AlertDialog
 import androidx.core.content.ContextCompat
@@ -202,6 +203,17 @@ class FileDisplayActivity : FileActivity(),
     private var isLightUser = false
     private var isMultiPersonal = false
 
+    private val onBackPressedCallback = object : OnBackPressedCallback(true) {
+        override fun handleOnBackPressed() {
+            onBackPressed()
+        }
+    }
+
+    fun addOnBackPressedCallback() {
+        onBackPressedCallback.remove()
+        onBackPressedDispatcher.addCallback(this, onBackPressedCallback)
+    }
+
     override fun onCreate(savedInstanceState: Bundle?) {
         Timber.v("onCreate() start")
 
@@ -307,6 +319,8 @@ class FileDisplayActivity : FileActivity(),
             }
         }
 
+        addOnBackPressedCallback()
+
         Timber.v("onCreate() end")
     }
 
@@ -536,6 +550,7 @@ class FileDisplayActivity : FileActivity(),
         transaction.replace(R.id.right_fragment_container, fragment, TAG_SECOND_FRAGMENT)
         transaction.commitNow()
         updateFragmentsVisibility(true)
+        mainFileListFragment?.collapseFab()
     }
 
     private fun showBottomNavBar(show: Boolean) {
@@ -747,6 +762,8 @@ class FileDisplayActivity : FileActivity(),
         fileOperationsViewModel.performOperation(copyOperation)
     }
 
+
+    // This is no longer directly called in newer Android versions, see also onBackPressedCallback.
     override fun onBackPressed() {
         val isFabOpen = mainFileListFragment?.isFabExpanded() ?: false
 

opencloudApp/src/main/java/eu/opencloud/android/ui/activity/FolderPickerActivity.kt

@@ -29,6 +29,7 @@ import android.os.Bundle
 import android.view.Menu
 import android.view.MenuItem
 import android.view.View
+import androidx.activity.OnBackPressedCallback
 import androidx.annotation.StringRes
 import androidx.core.view.isVisible
 import androidx.core.view.updatePadding
@@ -56,7 +57,16 @@ open class FolderPickerActivity : FileActivity(),
 
     private lateinit var binding: FilesFolderPickerBinding
 
+    private val onBackPressedCallback = object : OnBackPressedCallback(true) {
+        override fun handleOnBackPressed() {
+            onBackPressed()
+        }
+    }
 
+    fun addOnBackPressedCallback() {
+        onBackPressedCallback.remove()
+        onBackPressedDispatcher.addCallback(this, onBackPressedCallback)
+    }
 
     override fun onCreate(savedInstanceState: Bundle?) {
         Timber.d("onCreate() start")
@@ -134,6 +144,8 @@ open class FolderPickerActivity : FileActivity(),
             initAndShowListOfFilesFragment()
         }
 
+        addOnBackPressedCallback()
+
         Timber.d("onCreate() end")
     }
 
@@ -182,6 +194,7 @@ open class FolderPickerActivity : FileActivity(),
         return super.onOptionsItemSelected(item)
     }
 
+    // This is no longer directly called in newer Android versions, see also onBackPressedCallback.
     override fun onBackPressed() {
         val currentDirDisplayed = mainFileListFragment?.getCurrentFile()
         // If current file is null (we are in the spaces list, for example), close the activity