Fix backup warning issues

* Cache last Drive backup timestamp for offline use
* Fix updating backup error indicator

app/src/main/java/org/tasks/drive/DriveInvoker.kt

@@ -73,14 +73,14 @@ class DriveInvoker @Inject constructor(
     }
 
     @Throws(IOException::class)
-    suspend fun createFile(folderId: String, uri: Uri?) {
+    suspend fun createFile(folderId: String, uri: Uri?): File? {
         val mime = FileHelper.getMimeType(context, uri!!)
         val metadata = File()
                 .setParents(listOf(folderId))
                 .setMimeType(mime)
                 .setName(FileHelper.getFilename(context, uri))
         val content = InputStreamContent(mime, context.contentResolver.openInputStream(uri!!))
-        execute(service.files().create(metadata, content))
+        return execute(service.files().create(metadata, content))
     }
 
     @Synchronized

app/src/main/java/org/tasks/jobs/DriveUploader.kt

@@ -8,6 +8,7 @@ import androidx.work.Data
 import androidx.work.WorkerParameters
 import com.google.api.client.googleapis.json.GoogleJsonResponseException
 import com.google.api.services.drive.model.File
+import com.todoroo.astrid.backup.BackupConstants
 import org.tasks.LocalBroadcastManager
 import org.tasks.R
 import org.tasks.Strings.isNullOrEmpty
@@ -38,6 +39,12 @@ class DriveUploader @WorkerInject constructor(
             val folder = getFolder() ?: return Result.failure()
             preferences.setString(R.string.p_google_drive_backup_folder, folder.id)
             drive.createFile(folder.id, uri)
+                    ?.let {
+                        preferences.setLong(
+                                R.string.p_backups_drive_last,
+                                BackupConstants.getTimestamp(it)
+                        )
+                    }
             localBroadcastManager.broadcastPreferenceRefresh()
             if (inputData.getBoolean(EXTRA_PURGE, false)) {
                 drive

app/src/main/java/org/tasks/preferences/IconPreference.kt

@@ -10,16 +10,23 @@ import org.tasks.R
 
 class IconPreference(context: Context?, attrs: AttributeSet?) : Preference(context, attrs) {
 
-    var iconVisible = false
+    private var imageView: ImageView? = null
 
     override fun onBindViewHolder(holder: PreferenceViewHolder?) {
         super.onBindViewHolder(holder)
 
-        (holder?.findViewById(R.id.preference_icon) as ImageView?)?.visibility = if (iconVisible) {
+        imageView = holder?.findViewById(R.id.preference_icon) as ImageView?
-            View.VISIBLE
+        updateVisibility()
-        } else {
-            View.GONE
     }
+
+    var iconVisible: Boolean = false
+        set(value) {
+            field = value
+            updateVisibility()
+        }
+
+    private fun updateVisibility() {
+        imageView?.visibility = if (iconVisible) View.VISIBLE else View.GONE
     }
 
     init {

app/src/main/java/org/tasks/preferences/PreferencesViewModel.kt

@@ -7,7 +7,6 @@ import androidx.hilt.lifecycle.ViewModelInject
 import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
-import com.google.api.client.googleapis.json.GoogleJsonResponseException
 import com.google.api.services.drive.DriveScopes
 import com.todoroo.astrid.backup.BackupConstants
 import dagger.hilt.android.qualifiers.ApplicationContext
@@ -62,18 +61,20 @@ class PreferencesViewModel @ViewModelInject constructor(
             lastDriveBackup.value = -1L
             return@launch
         }
-        val files = preferences.getStringValue(R.string.p_google_drive_backup_folder)
+        lastDriveBackup.value = preferences
+                .getStringValue(R.string.p_google_drive_backup_folder)
                 ?.takeIf { it.isNotBlank() }
                 ?.let {
                     try {
                         driveInvoker.getFilesByPrefix(it, "auto.", "user.")
-                    } catch (e: GoogleJsonResponseException) {
+                                .firstOrNull()
+                                ?.let(BackupConstants::getTimestamp)
+                    } catch (e: Exception) {
                         Timber.e(e)
                         null
                     }
                 }
-                ?: emptyList()
+                ?: preferences.getLong(R.string.p_backups_drive_last, -1L)
-        lastDriveBackup.value = files.firstOrNull()?.let { BackupConstants.getTimestamp(it) } ?: -1
     }
 
     fun updateLocalBackup() = viewModelScope.launch {

app/src/main/java/org/tasks/preferences/fragments/Backups.kt

@@ -232,7 +232,8 @@ class Backups : InjectingPreferenceFragment() {
         else -> {
             preference.summary = null
             preference.icon = null
-            preferences.setString(R.string.p_google_drive_backup_account, null)
+            preferences.remove(R.string.p_backups_drive_last)
+            preferences.remove(R.string.p_google_drive_backup_account)
             updateDriveAccount()
             viewModel.updateDriveBackup()
             true

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

@@ -377,6 +377,7 @@
   <string name="p_backups_ignore_warnings">backups_ignore_warnings</string>
   <string name="p_backups_android_backup_enabled">backups_android_backup_enabled</string>
   <string name="p_backups_android_backup_last">backups_android_backup_last</string>
+  <string name="p_backups_drive_last">backups_drive_last</string>
   <string name="p_current_version">cv</string>
 
   <string name="event_whats_new">whats_new</string>