Fixed crash when going back while on call Activity

app/src/main/java/org/linphone/activities/GenericFragment.kt

@@ -29,12 +29,13 @@ import androidx.databinding.DataBindingUtil
 import androidx.databinding.ViewDataBinding
 import androidx.fragment.app.Fragment
 import androidx.navigation.fragment.findNavController
+import org.linphone.core.tools.Log
 
 abstract class GenericFragment<T : ViewDataBinding> : Fragment() {
     private var _binding: T? = null
     protected val binding get() = _binding!!
 
-    private val onBackPressedCallback = object : OnBackPressedCallback(true) {
+    protected val onBackPressedCallback = object : OnBackPressedCallback(true) {
         override fun handleOnBackPressed() {
             goBack()
         }
@@ -63,11 +64,17 @@ abstract class GenericFragment<T : ViewDataBinding> : Fragment() {
     }
 
     protected open fun goBack() {
+        try {
             if (!findNavController().popBackStack()) {
                 if (!findNavController().navigateUp()) {
                     onBackPressedCallback.isEnabled = false
                     requireActivity().onBackPressed()
                 }
             }
+        } catch (ise: IllegalStateException) {
+            Log.e("[Generic Fragment] Can't go back: $ise")
+            onBackPressedCallback.isEnabled = false
+            requireActivity().onBackPressed()
+        }
     }
 }

app/src/main/java/org/linphone/activities/call/fragments/ControlsFragment.kt

@@ -181,6 +181,11 @@ class ControlsFragment : GenericFragment<CallControlsFragmentBinding>() {
         }
     }
 
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        onBackPressedCallback.isEnabled = false
+    }
+
     override fun onStart() {
         super.onStart()
         initNumpadLayout()

app/src/main/java/org/linphone/activities/call/fragments/StatisticsFragment.kt

@@ -40,4 +40,9 @@ class StatisticsFragment : GenericFragment<CallStatisticsFragmentBinding>() {
         viewModel = ViewModelProvider(this).get(StatisticsListViewModel::class.java)
         binding.viewModel = viewModel
     }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        onBackPressedCallback.isEnabled = false
+    }
 }

app/src/main/java/org/linphone/activities/call/fragments/StatusFragment.kt

@@ -71,6 +71,11 @@ class StatusFragment : GenericFragment<CallStatusFragmentBinding>() {
         })
     }
 
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        onBackPressedCallback.isEnabled = false
+    }
+
     override fun onDestroy() {
         if (zrtpDialog != null) {
             zrtpDialog?.dismiss()