Handle error when the folder is removed externally

app/src/main/java/dev/arkbuilders/arkmemo/models/LoadError.kt

@@ -0,0 +1,5 @@
+package dev.arkbuilders.arkmemo.models
+
+sealed interface LoadError
+
+data class RootNotFound(val rootPath: String) : LoadError

app/src/main/java/dev/arkbuilders/arkmemo/preferences/MemoPreferences.kt

@@ -12,4 +12,6 @@ interface MemoPreferences {
     fun storeCrashReportEnabled(enabled: Boolean)
 
     fun getCrashReportEnabled(): Boolean
+
+    fun storageNotAvailable(): Boolean
 }

app/src/main/java/dev/arkbuilders/arkmemo/preferences/MemoPreferencesImpl.kt

@@ -7,6 +7,7 @@ import dev.arkbuilders.arkmemo.utils.CRASH_REPORT_ENABLE
 import java.nio.file.Path
 import javax.inject.Inject
 import kotlin.io.path.Path
+import kotlin.io.path.exists
 
 private const val NAME = "memo_prefs"
 private const val CURRENT_NOTES_PATH = "current_notes_path"
@@ -33,4 +34,8 @@ class MemoPreferencesImpl
         }
 
         override fun getCrashReportEnabled(): Boolean = sharedPreferences.getBoolean(CRASH_REPORT_ENABLE, true)
+
+        override fun storageNotAvailable(): Boolean {
+            return getPath().isEmpty() || !getNotesStorage().exists()
+        }
     }

app/src/main/java/dev/arkbuilders/arkmemo/ui/activities/MainActivity.kt

@@ -15,13 +15,16 @@ import dagger.hilt.android.AndroidEntryPoint
 import dev.arkbuilders.arkmemo.R
 import dev.arkbuilders.arkmemo.contracts.PermissionContract
 import dev.arkbuilders.arkmemo.databinding.ActivityMainBinding
+import dev.arkbuilders.arkmemo.models.RootNotFound
 import dev.arkbuilders.arkmemo.preferences.MemoPreferences
+import dev.arkbuilders.arkmemo.ui.dialogs.CommonActionDialog
 import dev.arkbuilders.arkmemo.ui.dialogs.FilePickerDialog
 import dev.arkbuilders.arkmemo.ui.fragments.BaseFragment
 import dev.arkbuilders.arkmemo.ui.fragments.EditTextNotesFragment
 import dev.arkbuilders.arkmemo.ui.fragments.NotesFragment
 import dev.arkbuilders.components.filepicker.onArkPathPicked
 import javax.inject.Inject
+import kotlin.io.path.exists
 
 @AndroidEntryPoint
 class MainActivity : AppCompatActivity(R.layout.activity_main) {
@@ -92,8 +95,13 @@ class MainActivity : AppCompatActivity(R.layout.activity_main) {
             }
         }
 
-        if (memoPreferences.getPath().isEmpty()) {
-            FilePickerDialog.show(this, supportFragmentManager)
+        val storageFolderExisting = memoPreferences.getNotesStorage().exists()
+        if (memoPreferences.storageNotAvailable()) {
+            if (!storageFolderExisting) {
+                showNoNoteStorageDialog(RootNotFound(rootPath = memoPreferences.getPath()))
+            } else {
+                FilePickerDialog.show(this, supportFragmentManager)
+            }
 
             supportFragmentManager.onArkPathPicked(this) {
                 memoPreferences.storePath(it.toString())
@@ -104,6 +112,27 @@ class MainActivity : AppCompatActivity(R.layout.activity_main) {
         }
     }
 
+    private fun showNoNoteStorageDialog(error: RootNotFound) {
+        val loadFailDialog =
+            CommonActionDialog(
+                title = getString(R.string.error_load_notes_failed_title),
+                message = getString(R.string.error_load_notes_failed_description, error.rootPath),
+                positiveText = R.string.error_load_notes_failed_positive_action,
+                negativeText = R.string.error_load_notes_failed_negative_action,
+                isAlert = false,
+                onPositiveClick = {
+                    FilePickerDialog.show(this, supportFragmentManager)
+                },
+                onNegativeClicked = {
+                    finish()
+                },
+                onCloseClicked = {
+                    finish()
+                },
+            )
+        loadFailDialog.show(supportFragmentManager, CommonActionDialog.TAG)
+    }
+
     override fun onSaveInstanceState(outState: Bundle) {
         outState.putString(CURRENT_FRAGMENT_TAG, fragment.tag)
         super.onSaveInstanceState(outState)

app/src/main/java/dev/arkbuilders/arkmemo/ui/adapters/NotesListAdapter.kt

@@ -23,6 +23,7 @@ import dev.arkbuilders.arkmemo.ui.activities.MainActivity
 import dev.arkbuilders.arkmemo.ui.fragments.ArkRecorderFragment
 import dev.arkbuilders.arkmemo.ui.fragments.EditGraphicNotesFragment
 import dev.arkbuilders.arkmemo.ui.fragments.EditTextNotesFragment
+import dev.arkbuilders.arkmemo.ui.fragments.NotesFragment
 import dev.arkbuilders.arkmemo.ui.viewmodels.ArkMediaPlayerSideEffect
 import dev.arkbuilders.arkmemo.ui.viewmodels.ArkMediaPlayerState
 import dev.arkbuilders.arkmemo.utils.getAutoTitle
@@ -295,6 +296,11 @@ class NotesListAdapter(
 
         private val clickNoteToEditListener =
             View.OnClickListener {
+                val storageFolderExist = (activity.fragment as? NotesFragment)?.checkForStorageExistence() ?: true
+                if (!storageFolderExist) {
+                    return@OnClickListener
+                }
+
                 if (mActionMode) {
                     checkedByItemClick = true
                     binding.cbDelete.toggle()

app/src/main/java/dev/arkbuilders/arkmemo/ui/dialogs/FilePickerDialog.kt

@@ -24,20 +24,18 @@ class FilePickerDialog : ArkFilePickerFragment() {
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
-        if (storageNotAvailable()) {
+        if (memoPreferences.storageNotAvailable()) {
             isCancelable = false
         }
     }
 
     override fun dismiss() {
         super.dismiss()
-        if (storageNotAvailable()) {
+        if (memoPreferences.storageNotAvailable()) {
             activity?.finish()
         }
     }
 
-    private fun storageNotAvailable(): Boolean = memoPreferences.getPath().isEmpty()
-
     companion object {
         private const val TAG = "file_picker"
         private lateinit var fragmentManager: FragmentManager

app/src/main/java/dev/arkbuilders/arkmemo/ui/fragments/NotesFragment.kt

@@ -20,10 +20,12 @@ import dagger.hilt.android.AndroidEntryPoint
 import dev.arkbuilders.arkmemo.R
 import dev.arkbuilders.arkmemo.databinding.FragmentHomeBinding
 import dev.arkbuilders.arkmemo.models.Note
+import dev.arkbuilders.arkmemo.models.RootNotFound
 import dev.arkbuilders.arkmemo.models.VoiceNote
 import dev.arkbuilders.arkmemo.ui.activities.MainActivity
 import dev.arkbuilders.arkmemo.ui.adapters.NotesListAdapter
 import dev.arkbuilders.arkmemo.ui.dialogs.CommonActionDialog
+import dev.arkbuilders.arkmemo.ui.dialogs.FilePickerDialog
 import dev.arkbuilders.arkmemo.ui.viewmodels.ArkMediaPlayerSideEffect
 import dev.arkbuilders.arkmemo.ui.viewmodels.ArkMediaPlayerViewModel
 import dev.arkbuilders.arkmemo.ui.viewmodels.NotesViewModel
@@ -62,6 +64,10 @@ class NotesFragment : BaseFragment() {
 
     private val pasteNoteClickListener =
         View.OnClickListener {
+            if (!checkForStorageExistence()) {
+                return@OnClickListener
+            }
+
             requireContext().getTextFromClipBoard(view) { clipBoardText ->
                 if (clipBoardText != null) {
                     activity.fragment = EditTextNotesFragment.newInstance(clipBoardText)
@@ -151,6 +157,9 @@ class NotesFragment : BaseFragment() {
         activity.title = getString(R.string.app_name)
         activity.supportActionBar?.setDisplayHomeAsUpEnabled(false)
         binding.ivSettings.setOnClickListener {
+            if (!checkForStorageExistence()) {
+                return@setOnClickListener
+            }
             activity.fragment = SettingsFragment()
             activity.replaceFragment(activity.fragment, SettingsFragment::class.java.name)
         }
@@ -419,6 +428,10 @@ class NotesFragment : BaseFragment() {
             binding.groupFabActions.gone()
             showingFloatingButtons = false
         } else {
+            if (!checkForStorageExistence()) {
+                return
+            }
+
             binding.fabNewAction.extend()
             binding.fabNewAction.icon = ContextCompat.getDrawable(activity, R.drawable.ic_close)
             binding.fabNewAction.backgroundTintList =
@@ -539,6 +552,35 @@ class NotesFragment : BaseFragment() {
         }
     }
 
+    private fun showNoNoteStorageDialog(error: RootNotFound) {
+        val loadFailDialog =
+            CommonActionDialog(
+                title = getString(R.string.error_load_notes_failed_title),
+                message = getString(R.string.error_load_notes_failed_description, error.rootPath),
+                positiveText = R.string.error_load_notes_failed_positive_action,
+                negativeText = R.string.error_load_notes_failed_negative_action,
+                isAlert = false,
+                onPositiveClick = {
+                    FilePickerDialog.show(activity, fragmentManager = parentFragmentManager)
+                },
+                onNegativeClicked = {
+                    activity.finish()
+                },
+                onCloseClicked = {
+                    activity.finish()
+                },
+            )
+        loadFailDialog.show(parentFragmentManager, CommonActionDialog.TAG)
+    }
+
+    fun checkForStorageExistence(): Boolean {
+        if (notesViewModel.storageFolderNotAvailable()) {
+            showNoNoteStorageDialog(RootNotFound(rootPath = notesViewModel.getStorageFolderPath()))
+            return false
+        }
+        return true
+    }
+
     companion object {
         const val TAG = "NotesFragment"
     }

app/src/main/java/dev/arkbuilders/arkmemo/ui/viewmodels/NotesViewModel.kt

@@ -12,6 +12,7 @@ import dev.arkbuilders.arkmemo.models.Note
 import dev.arkbuilders.arkmemo.models.SaveNoteResult
 import dev.arkbuilders.arkmemo.models.TextNote
 import dev.arkbuilders.arkmemo.models.VoiceNote
+import dev.arkbuilders.arkmemo.preferences.MemoPreferences
 import dev.arkbuilders.arkmemo.repo.NotesRepo
 import dev.arkbuilders.arkmemo.utils.extractDuration
 import kotlinx.coroutines.CoroutineDispatcher
@@ -39,6 +40,9 @@ class NotesViewModel
         private val mSaveNoteResultLiveData = MutableLiveData<SaveNoteResult>()
         private var searchJob: Job? = null
 
+        @Inject
+        lateinit var memoPreferences: MemoPreferences
+
         fun init(extraBlock: () -> Unit) {
             val initJob =
                 viewModelScope.launch(iODispatcher) {
@@ -179,4 +183,12 @@ class NotesViewModel
         fun getSaveNoteResultLiveData(): LiveData<SaveNoteResult> {
             return mSaveNoteResultLiveData
         }
+
+        fun storageFolderNotAvailable(): Boolean {
+            return memoPreferences.storageNotAvailable()
+        }
+
+        fun getStorageFolderPath(): String {
+            return memoPreferences.getPath()
+        }
     }

app/src/main/res/values/strings.xml

@@ -117,5 +117,9 @@
     </plurals>
     <string name="select_all">Select All</string>
     <string name="deselect_all">Deselect All</string>
+    <string name="error_load_notes_failed_title">Cannot find notes</string>
+    <string name="error_load_notes_failed_description">The folder %s with notes data cannot be located.\nPlease select a new folder.</string>
+    <string name="error_load_notes_failed_positive_action">Select</string>
+    <string name="error_load_notes_failed_negative_action">Leave</string>
 
 </resources>