Adds support for preferences directory, list of preferences to import, additional check on imported preferences metadata

app/build.gradle

@@ -31,6 +31,7 @@ ext {
     retrofit2Version = '2.8.1'
     okhttp3Version = '4.6.0'
     coroutinesVersion = '1.3.5'
+    activityVersion = '1.2.0-alpha03'
 }
 
 
@@ -264,6 +265,8 @@ dependencies {
     implementation 'androidx.gridlayout:gridlayout:1.0.0'
     implementation 'androidx.percentlayout:percentlayout:1.0.0'
     implementation "androidx.preference:preference-ktx:1.1.1"
+    implementation "androidx.activity:activity:${activityVersion}"
+    implementation "androidx.activity:activity-ktx:${activityVersion}"
     implementation 'com.google.android.material:material:1.1.0'
     implementation 'com.wdullaer:materialdatetimepicker:4.2.3'
 

app/src/main/AndroidManifest.xml

@@ -82,6 +82,7 @@
             </intent-filter>
         </activity>
         <activity android:name=".plugins.pump.danaRS.activities.PairingHelperActivity" />
+        <activity android:name=".plugins.general.maintenance.activities.PrefImportListActivity" />
         <activity android:name=".historyBrowser.HistoryBrowseActivity" />
         <activity android:name=".activities.SurveyActivity" />
         <activity android:name=".activities.StatsActivity" />

app/src/main/java/info/nightscout/androidaps/dependencyInjection/ActivitiesModule.kt

@@ -6,6 +6,7 @@ import info.nightscout.androidaps.MainActivity
 import info.nightscout.androidaps.activities.*
 import info.nightscout.androidaps.historyBrowser.HistoryBrowseActivity
 import info.nightscout.androidaps.plugins.general.maintenance.activities.LogSettingActivity
+import info.nightscout.androidaps.plugins.general.maintenance.activities.PrefImportListActivity
 import info.nightscout.androidaps.plugins.general.overview.activities.QuickWizardListActivity
 import info.nightscout.androidaps.plugins.general.smsCommunicator.activities.SmsCommunicatorOtpActivity
 import info.nightscout.androidaps.plugins.pump.common.dialog.RileyLinkBLEScanActivity
@@ -48,4 +49,5 @@ abstract class ActivitiesModule {
     @ContributesAndroidInjector abstract fun contributesStatsActivity(): StatsActivity
     @ContributesAndroidInjector abstract fun contributesSurveyActivity(): SurveyActivity
     @ContributesAndroidInjector abstract fun contributesTDDStatsActivity(): TDDStatsActivity
+    @ContributesAndroidInjector abstract fun contributesPrefImportListActivity(): PrefImportListActivity
 }

app/src/main/java/info/nightscout/androidaps/dependencyInjection/PreferencesModule.kt

@@ -3,6 +3,7 @@ package info.nightscout.androidaps.dependencyInjection
 import dagger.Module
 import dagger.android.ContributesAndroidInjector
 import info.nightscout.androidaps.plugins.general.maintenance.ImportExportPrefs
+import info.nightscout.androidaps.plugins.general.maintenance.PrefFileListProvider
 import info.nightscout.androidaps.plugins.general.maintenance.formats.ClassicPrefsFormat
 import info.nightscout.androidaps.plugins.general.maintenance.formats.EncryptedPrefsFormat
 import info.nightscout.androidaps.utils.CryptoUtil
@@ -15,4 +16,5 @@ abstract class PreferencesModule {
     @ContributesAndroidInjector abstract fun importExportPrefsInjector(): ImportExportPrefs
     @ContributesAndroidInjector abstract fun encryptedPrefsFormatInjector(): EncryptedPrefsFormat
     @ContributesAndroidInjector abstract fun classicPrefsFormatInjector(): ClassicPrefsFormat
+    @ContributesAndroidInjector abstract fun prefImportListProviderInjector(): PrefFileListProvider
 }

app/src/main/java/info/nightscout/androidaps/plugins/constraints/versionChecker/VersionCheckerUtils.kt

@@ -116,6 +116,14 @@ class VersionCheckerUtils @Inject constructor(
     private fun String?.toNumberList() =
         this?.numericVersionPart().takeIf { !it.isNullOrBlank() }?.split(".")?.map { it.toInt() }
 
+    fun versionDigits(versionString: String?): IntArray {
+        val digits = mutableListOf<Int>()
+        versionString?.numericVersionPart().toNumberList()?.let {
+            digits.addAll(it.take(4))
+        }
+        return digits.toIntArray()
+    }
+
     fun findVersion(file: String?): String? {
         val regex = "(.*)version(.*)\"(((\\d+)\\.)+(\\d+))\"(.*)".toRegex()
         return file?.lines()?.filter { regex.matches(it) }?.mapNotNull { regex.matchEntire(it)?.groupValues?.getOrNull(3) }?.firstOrNull()

app/src/main/java/info/nightscout/androidaps/plugins/general/maintenance/ImportExportPrefs.kt

@@ -6,12 +6,12 @@ import android.bluetooth.BluetoothAdapter
 import android.content.Context
 import android.content.Intent
 import android.content.pm.PackageManager
-import android.os.Build
-import android.os.Environment
 import android.provider.Settings
+import androidx.activity.invoke
 import androidx.annotation.StringRes
 import androidx.core.content.ContextCompat
 import androidx.fragment.app.Fragment
+import androidx.fragment.app.FragmentActivity
 import info.nightscout.androidaps.BuildConfig
 import info.nightscout.androidaps.R
 import info.nightscout.androidaps.activities.PreferencesActivity
@@ -22,9 +22,9 @@ import info.nightscout.androidaps.plugins.bus.RxBusWrapper
 import info.nightscout.androidaps.plugins.general.maintenance.formats.*
 import info.nightscout.androidaps.plugins.general.smsCommunicator.otp.OneTimePassword
 import info.nightscout.androidaps.utils.DateUtil
+import info.nightscout.androidaps.utils.ToastUtils
 import info.nightscout.androidaps.utils.alertDialogs.OKDialog
 import info.nightscout.androidaps.utils.alertDialogs.OKDialog.show
-import info.nightscout.androidaps.utils.ToastUtils
 import info.nightscout.androidaps.utils.alertDialogs.PrefImportSummaryDialog
 import info.nightscout.androidaps.utils.alertDialogs.TwoMessagesAlertDialog
 import info.nightscout.androidaps.utils.alertDialogs.WarningDialog
@@ -32,8 +32,6 @@ import info.nightscout.androidaps.utils.buildHelper.BuildHelper
 import info.nightscout.androidaps.utils.protection.PasswordCheck
 import info.nightscout.androidaps.utils.resources.ResourceHelper
 import info.nightscout.androidaps.utils.sharedPreferences.SP
-import org.joda.time.DateTime
-import org.joda.time.Days
 import java.io.File
 import java.io.FileNotFoundException
 import java.io.IOException
@@ -51,37 +49,25 @@ private val PERMISSIONS_STORAGE = arrayOf(
     Manifest.permission.WRITE_EXTERNAL_STORAGE
 )
 
-private const val IMPORT_AGE_NOT_YET_OLD_DAYS = 60
-
 @Singleton
 class ImportExportPrefs @Inject constructor(
     private var log: AAPSLogger,
     private val resourceHelper: ResourceHelper,
     private val sp: SP,
     private val buildHelper: BuildHelper,
-    private val otp: OneTimePassword,
     private val rxBus: RxBusWrapper,
     private val passwordCheck: PasswordCheck,
     private val classicPrefsFormat: ClassicPrefsFormat,
-    private val encryptedPrefsFormat: EncryptedPrefsFormat
+    private val encryptedPrefsFormat: EncryptedPrefsFormat,
+    private val prefFileList: PrefFileListProvider
 ) {
 
     val TAG = LTag.CORE
 
-    private val path = File(Environment.getExternalStorageDirectory().toString())
-
-    private val file = File(path, resourceHelper.gs(R.string.app_name) + "Preferences")
-    private val encFile = File(path, resourceHelper.gs(R.string.app_name) + "Preferences.json")
-
-    fun prefsImportFile(): File {
-        return if (encFile.exists()) encFile else file
-    }
-
     fun prefsFileExists(): Boolean {
-        return encFile.exists() || file.exists()
+        return prefFileList.listPreferenceFiles().size > 0
     }
 
-
     fun exportSharedPreferences(f: Fragment) {
         f.activity?.let { exportSharedPreferences(it) }
     }
@@ -135,9 +121,6 @@ class ImportExportPrefs @Inject constructor(
         return name
     }
 
-    private fun getCurrentDeviceModelString() =
-        Build.MANUFACTURER + " " + Build.MODEL + " (" + Build.DEVICE + ")"
-
     private fun prefsEncryptionIsDisabled() =
         buildHelper.isEngineeringMode() && !sp.getBoolean(resourceHelper.gs(R.string.key_maintenance_encrypt_exported_prefs), true)
 
@@ -173,36 +156,41 @@ class ImportExportPrefs @Inject constructor(
         return true
     }
 
-    private fun askToConfirmExport(activity: Activity, then: ((password: String) -> Unit)) {
+    private fun askToConfirmExport(activity: Activity, fileToExport: File, then: ((password: String) -> Unit)) {
         if (!prefsEncryptionIsDisabled() && !assureMasterPasswordSet(activity, R.string.nav_export)) return
 
         TwoMessagesAlertDialog.showAlert(activity, resourceHelper.gs(R.string.nav_export),
-            resourceHelper.gs(R.string.export_to) + " " + encFile + " ?",
+            resourceHelper.gs(R.string.export_to) + " " + fileToExport + " ?",
             resourceHelper.gs(R.string.password_preferences_encrypt_prompt), {
             askForMasterPassIfNeeded(activity, R.string.preferences_export_canceled, then)
         }, null, R.drawable.ic_header_export)
     }
 
-    private fun askToConfirmImport(activity: Activity, fileToImport: File, then: ((password: String) -> Unit)) {
+    private fun askToConfirmImport(activity: Activity, fileToImport: PrefsFile, then: ((password: String) -> Unit)) {
 
-        if (encFile.exists()) {
+        if (fileToImport.handler == PrefsFormatsHandler.ENCRYPTED) {
             if (!assureMasterPasswordSet(activity, R.string.nav_import)) return
 
             TwoMessagesAlertDialog.showAlert(activity, resourceHelper.gs(R.string.nav_import),
-                resourceHelper.gs(R.string.import_from) + " " + fileToImport + " ?",
+                resourceHelper.gs(R.string.import_from) + " " + fileToImport.file + " ?",
                 resourceHelper.gs(R.string.password_preferences_decrypt_prompt), {
                 askForMasterPass(activity, R.string.preferences_import_canceled, then)
             }, null, R.drawable.ic_header_import)
 
         } else {
             OKDialog.showConfirmation(activity, resourceHelper.gs(R.string.nav_import),
-                resourceHelper.gs(R.string.import_from) + " " + fileToImport + " ?",
+                resourceHelper.gs(R.string.import_from) + " " + fileToImport.file + " ?",
                 Runnable { then("") })
         }
     }
 
     private fun exportSharedPreferences(activity: Activity) {
-        askToConfirmExport(activity) { password ->
+
+        prefFileList.ensureExportDirExists()
+        val legacyFile = prefFileList.legacyFile()
+        val newFile = prefFileList.newExportFile()
+
+        askToConfirmExport(activity, newFile) { password ->
             try {
                 val entries: MutableMap<String, String> = mutableMapOf()
                 for ((key, value) in sp.getAll()) {
@@ -211,12 +199,14 @@ class ImportExportPrefs @Inject constructor(
 
                 val prefs = Prefs(entries, prepareMetadata(activity))
 
-                classicPrefsFormat.savePreferences(file, prefs)
+                if (BuildConfig.DEBUG && buildHelper.isEngineeringMode()) {
-                encryptedPrefsFormat.savePreferences(encFile, prefs, password)
+                    classicPrefsFormat.savePreferences(legacyFile, prefs)
+                }
+                encryptedPrefsFormat.savePreferences(newFile, prefs, password)
 
                 ToastUtils.okToast(activity, resourceHelper.gs(R.string.exported))
             } catch (e: FileNotFoundException) {
-                ToastUtils.errorToast(activity, resourceHelper.gs(R.string.filenotfound) + " " + encFile)
+                ToastUtils.errorToast(activity, resourceHelper.gs(R.string.filenotfound) + " " + newFile)
                 log.error(TAG, "Unhandled exception", e)
             } catch (e: IOException) {
                 ToastUtils.errorToast(activity, e.message)
@@ -226,21 +216,38 @@ class ImportExportPrefs @Inject constructor(
     }
 
     fun importSharedPreferences(fragment: Fragment) {
-        fragment.activity?.let { importSharedPreferences(it) }
+        fragment.activity?.let { fragmentAct ->
+            val callForPrefFile = fragmentAct.prepareCall(PrefsFileContract()) {
+                it?.let {
+                    importSharedPreferences(fragmentAct, it)
+                }
+            }
+            callForPrefFile.invoke()
+        }
     }
 
-    fun importSharedPreferences(activity: Activity) {
+    fun importSharedPreferences(activity: FragmentActivity) {
+        val callForPrefFile = activity.prepareCall(PrefsFileContract()) {
+            it?.let {
+                importSharedPreferences(activity, it)
+            }
+        }
+        callForPrefFile.invoke()
+    }
 
-        val importFile = prefsImportFile()
+    private fun importSharedPreferences(activity: Activity, importFile: PrefsFile) {
 
         askToConfirmImport(activity, importFile) { password ->
 
-            val format: PrefsFormat = if (encFile.exists()) encryptedPrefsFormat else classicPrefsFormat
+            val format: PrefsFormat = when (importFile.handler) {
+                PrefsFormatsHandler.CLASSIC   -> classicPrefsFormat
+                PrefsFormatsHandler.ENCRYPTED -> encryptedPrefsFormat
+            }
 
             try {
 
-                val prefs = format.loadPreferences(importFile, password)
+                val prefs = format.loadPreferences(importFile.file, password)
-                prefs.metadata = checkMetadata(prefs.metadata)
+                prefs.metadata = prefFileList.checkMetadata(prefs.metadata)
 
                 // import is OK when we do not have errors (warnings are allowed)
                 val importOk = checkIfImportIsOk(prefs)
@@ -276,45 +283,6 @@ class ImportExportPrefs @Inject constructor(
         }
     }
 
-    // check metadata for known issues, change their status and add info with explanations
-    private fun checkMetadata(metadata: Map<PrefsMetadataKey, PrefMetadata>): Map<PrefsMetadataKey, PrefMetadata> {
-        val meta = metadata.toMutableMap()
-
-         meta[PrefsMetadataKey.AAPS_FLAVOUR]?.let { flavour ->
-             val flavourOfPrefs = flavour.value
-             if (flavour.value != BuildConfig.FLAVOR) {
-                 flavour.status = PrefsStatus.WARN
-                 flavour.info = resourceHelper.gs(R.string.metadata_warning_different_flavour, flavourOfPrefs, BuildConfig.FLAVOR)
-             }
-         }
-
-        meta[PrefsMetadataKey.DEVICE_MODEL]?.let { model ->
-            if (model.value != getCurrentDeviceModelString()) {
-                model.status = PrefsStatus.WARN
-                model.info = resourceHelper.gs(R.string.metadata_warning_different_device)
-            }
-        }
-
-        meta[PrefsMetadataKey.CREATED_AT]?.let { createdAt ->
-            try {
-                val date1 = DateTime.parse(createdAt.value);
-                val date2 = DateTime.now()
-
-                val daysOld = Days.daysBetween(date1.toLocalDate(), date2.toLocalDate()).getDays()
-
-                if (daysOld > IMPORT_AGE_NOT_YET_OLD_DAYS) {
-                    createdAt.status = PrefsStatus.WARN
-                    createdAt.info = resourceHelper.gs(R.string.metadata_warning_old_export, daysOld.toString())
-                }
-            } catch (e: Exception) {
-                createdAt.status = PrefsStatus.WARN
-                createdAt.info = resourceHelper.gs(R.string.metadata_warning_date_format)
-            }
-        }
-
-        return meta
-    }
-
     private fun checkIfImportIsOk(prefs: Prefs): Boolean {
         var importOk = true
 

app/src/main/java/info/nightscout/androidaps/plugins/general/maintenance/PrefFileListProvider.kt

@@ -0,0 +1,219 @@
+package info.nightscout.androidaps.plugins.general.maintenance
+
+import android.app.Activity
+import android.content.Context
+import android.content.Intent
+import android.os.Build
+import android.os.Environment
+import android.os.Parcelable
+import androidx.activity.result.contract.ActivityResultContract
+import info.nightscout.androidaps.BuildConfig
+import info.nightscout.androidaps.R
+import info.nightscout.androidaps.logging.AAPSLogger
+import info.nightscout.androidaps.plugins.constraints.versionChecker.VersionCheckerUtils
+import info.nightscout.androidaps.plugins.general.maintenance.activities.PrefImportListActivity
+import info.nightscout.androidaps.plugins.general.maintenance.formats.*
+import info.nightscout.androidaps.utils.resources.ResourceHelper
+import info.nightscout.androidaps.utils.sharedPreferences.SP
+import info.nightscout.androidaps.utils.storage.Storage
+import kotlinx.android.parcel.Parcelize
+import kotlinx.android.parcel.RawValue
+import org.joda.time.DateTime
+import org.joda.time.Days
+import org.joda.time.Hours
+import org.joda.time.LocalDateTime
+import org.joda.time.format.DateTimeFormat
+import java.io.File
+import javax.inject.Inject
+import javax.inject.Singleton
+
+enum class PrefsImportDir {
+    ROOT_DIR,
+    AAPS_DIR
+}
+
+@Parcelize
+data class PrefsFile(
+    val file: File,
+    val baseDir: File,
+    val dirKind: PrefsImportDir,
+    val handler: PrefsFormatsHandler,
+
+    // metadata here is used only for list display
+    val metadata: @RawValue Map<PrefsMetadataKey, PrefMetadata>
+) : Parcelable
+
+class PrefsFileContract : ActivityResultContract<Void, PrefsFile>() {
+
+    companion object {
+        const val OUTPUT_PARAM = "prefs_file"
+    }
+
+    override fun parseResult(resultCode: Int, intent: Intent?): PrefsFile? {
+        return when (resultCode) {
+            Activity.RESULT_OK -> intent?.getParcelableExtra(OUTPUT_PARAM)
+            else               -> null
+        }
+    }
+
+    override fun createIntent(context: Context, input: Void?): Intent {
+        return Intent(context, PrefImportListActivity::class.java)
+    }
+}
+
+fun getCurrentDeviceModelString() =
+    Build.MANUFACTURER + " " + Build.MODEL + " (" + Build.DEVICE + ")"
+
+@Singleton
+class PrefFileListProvider @Inject constructor(
+    private val resourceHelper: ResourceHelper,
+    private val classicPrefsFormat: ClassicPrefsFormat,
+    private val encryptedPrefsFormat: EncryptedPrefsFormat,
+    private val storage: Storage,
+    private val versionCheckerUtils: VersionCheckerUtils
+) {
+
+    companion object {
+        private val path = File(Environment.getExternalStorageDirectory().toString())
+        private val aapsPath = File(path, "AAPS" + File.separator + "preferences")
+        private const val IMPORT_AGE_NOT_YET_OLD_DAYS = 60
+    }
+
+    /**
+     * This function tries to list possible preference files from main SDCard root dir and AAPS/preferences dir
+     * and tries to do quick assessment for preferences format plausibility.
+     * It does NOT load full metadata or is 100% accurate - it tries to do QUICK detection, based on:
+     *  - file name and extension
+     *  - predicted file contents
+     */
+    fun listPreferenceFiles(loadMetadata: Boolean = false): MutableList<PrefsFile> {
+        val prefFiles = mutableListOf<PrefsFile>()
+
+        // searching rood dir for legacy files
+        path.walk().maxDepth(1).filter { it.isFile && (it.name.endsWith(".json") || it.name.contains("Preferences")) }.forEach {
+            val contents = storage.getFileContents(it)
+            val detectedNew = encryptedPrefsFormat.isPreferencesFile(it, contents)
+            val detectedOld = !detectedNew && classicPrefsFormat.isPreferencesFile(it, contents)
+            if (detectedNew || detectedOld) {
+                val formatHandler = if (detectedNew) PrefsFormatsHandler.ENCRYPTED else PrefsFormatsHandler.CLASSIC
+                prefFiles.add(PrefsFile(it, path, PrefsImportDir.ROOT_DIR, formatHandler, metadataFor(loadMetadata, formatHandler, contents)))
+            }
+        }
+
+        // searching dedicated dir, only for new JSON format
+        aapsPath.walk().filter { it.isFile && it.name.endsWith(".json") }.forEach {
+            val contents = storage.getFileContents(it)
+            if (encryptedPrefsFormat.isPreferencesFile(it, contents)) {
+                prefFiles.add(PrefsFile(it, aapsPath, PrefsImportDir.AAPS_DIR, PrefsFormatsHandler.ENCRYPTED, metadataFor(loadMetadata, PrefsFormatsHandler.ENCRYPTED, contents)))
+            }
+        }
+
+        // we sort only if we have metadata to be used for that
+        if (loadMetadata) {
+            prefFiles.sortWith(
+                compareByDescending<PrefsFile> { it.handler }
+                    .thenBy { it.metadata[PrefsMetadataKey.AAPS_FLAVOUR]?.status }
+                    .thenByDescending { it.metadata[PrefsMetadataKey.CREATED_AT]?.value }
+            )
+        }
+
+        return prefFiles
+    }
+
+    private fun metadataFor(loadMetadata: Boolean, formatHandler: PrefsFormatsHandler, contents: String): PrefMetadataMap {
+        if (!loadMetadata) {
+            return mapOf()
+        }
+        return checkMetadata(when (formatHandler) {
+            PrefsFormatsHandler.CLASSIC   -> classicPrefsFormat.loadMetadata(contents)
+            PrefsFormatsHandler.ENCRYPTED -> encryptedPrefsFormat.loadMetadata(contents)
+        })
+    }
+
+    fun legacyFile(): File {
+        return File(path, resourceHelper.gs(R.string.app_name) + "Preferences")
+    }
+
+    fun ensureExportDirExists() {
+        if (!aapsPath.exists()) {
+            aapsPath.mkdirs()
+        }
+    }
+
+    fun newExportFile(): File {
+        val timeLocal = LocalDateTime.now().toString(DateTimeFormat.forPattern("yyyy-MM-dd'_'HHmmss"))
+        return File(aapsPath, timeLocal + "_" + BuildConfig.FLAVOR + ".json")
+    }
+
+    // check metadata for known issues, change their status and add info with explanations
+    fun checkMetadata(metadata: Map<PrefsMetadataKey, PrefMetadata>): Map<PrefsMetadataKey, PrefMetadata> {
+        val meta = metadata.toMutableMap()
+
+        meta[PrefsMetadataKey.AAPS_FLAVOUR]?.let { flavour ->
+            val flavourOfPrefs = flavour.value
+            if (flavour.value != BuildConfig.FLAVOR) {
+                flavour.status = PrefsStatus.WARN
+                flavour.info = resourceHelper.gs(R.string.metadata_warning_different_flavour, flavourOfPrefs, BuildConfig.FLAVOR)
+            }
+        }
+
+        meta[PrefsMetadataKey.DEVICE_MODEL]?.let { model ->
+            if (model.value != getCurrentDeviceModelString()) {
+                model.status = PrefsStatus.WARN
+                model.info = resourceHelper.gs(R.string.metadata_warning_different_device)
+            }
+        }
+
+        meta[PrefsMetadataKey.CREATED_AT]?.let { createdAt ->
+            try {
+                val date1 = DateTime.parse(createdAt.value);
+                val date2 = DateTime.now()
+
+                val daysOld = Days.daysBetween(date1.toLocalDate(), date2.toLocalDate()).getDays()
+
+                if (daysOld > IMPORT_AGE_NOT_YET_OLD_DAYS) {
+                    createdAt.status = PrefsStatus.WARN
+                    createdAt.info = resourceHelper.gs(R.string.metadata_warning_old_export, daysOld.toString())
+                }
+            } catch (e: Exception) {
+                createdAt.status = PrefsStatus.WARN
+                createdAt.info = resourceHelper.gs(R.string.metadata_warning_date_format)
+            }
+        }
+
+        meta[PrefsMetadataKey.AAPS_VERSION]?.let { version ->
+            val currentAppVer = versionCheckerUtils.versionDigits(BuildConfig.VERSION_NAME)
+            val metadataVer = versionCheckerUtils.versionDigits(version.value)
+
+            if ((currentAppVer.size >= 2) && (metadataVer.size >= 2) && (Math.abs(currentAppVer[1] - metadataVer[1]) > 1)) {
+                version.status = PrefsStatus.WARN
+                version.info = resourceHelper.gs(R.string.metadata_warning_different_version)
+            }
+
+            if ((currentAppVer.isNotEmpty()) && (metadataVer.isNotEmpty()) && (currentAppVer[0] != metadataVer[0])) {
+                version.status = PrefsStatus.WARN
+                version.info = resourceHelper.gs(R.string.metadata_urgent_different_version)
+            }
+        }
+
+        return meta
+    }
+
+    fun formatExportedAgo(utcTime: String): String {
+        val refTime = DateTime.now()
+        val itTime = DateTime.parse(utcTime)
+        val days = Days.daysBetween(itTime, refTime).days
+        val hours = Hours.hoursBetween(itTime, refTime).hours
+
+        return if (hours == 0) {
+            resourceHelper.gs(R.string.exported_less_than_hour_ago)
+        } else if ((hours < 24) && (hours > 0)) {
+            resourceHelper.gs(R.string.exported_ago, resourceHelper.gq(R.plurals.objective_hours, hours, hours))
+        } else if ((days < IMPORT_AGE_NOT_YET_OLD_DAYS) && (days > 0)) {
+            resourceHelper.gs(R.string.exported_ago, resourceHelper.gq(R.plurals.objective_days, days, days))
+        } else {
+            resourceHelper.gs(R.string.exported_at, utcTime.substring(0, 10))
+        }
+    }
+
+}

app/src/main/java/info/nightscout/androidaps/plugins/general/maintenance/activities/PrefImportListActivity.kt

@@ -0,0 +1,135 @@
+package info.nightscout.androidaps.plugins.general.maintenance.activities
+
+import android.app.Activity
+import android.content.Context
+import android.content.Intent
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.MenuItem
+import android.view.View
+import android.view.ViewGroup
+import android.widget.TextView
+import androidx.recyclerview.widget.LinearLayoutManager
+import androidx.recyclerview.widget.RecyclerView
+import dagger.android.support.DaggerAppCompatActivity
+import info.nightscout.androidaps.R
+import info.nightscout.androidaps.plugins.general.maintenance.PrefFileListProvider
+import info.nightscout.androidaps.plugins.general.maintenance.PrefsFile
+import info.nightscout.androidaps.plugins.general.maintenance.PrefsFileContract
+import info.nightscout.androidaps.plugins.general.maintenance.formats.PrefsFormatsHandler
+import info.nightscout.androidaps.plugins.general.maintenance.formats.PrefsMetadataKey
+import info.nightscout.androidaps.plugins.general.maintenance.formats.PrefsStatus
+import info.nightscout.androidaps.utils.LocaleHelper
+import info.nightscout.androidaps.utils.resources.ResourceHelper
+import kotlinx.android.synthetic.main.maintenance_importlist_activity.*
+import javax.inject.Inject
+
+class PrefImportListActivity : DaggerAppCompatActivity() {
+
+    @Inject lateinit var resourceHelper: ResourceHelper
+    @Inject lateinit var prefFileListProvider: PrefFileListProvider
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setTheme(R.style.AppTheme)
+        setContentView(R.layout.maintenance_importlist_activity)
+
+        title = resourceHelper.gs(R.string.preferences_import_list_title)
+        supportActionBar?.setDisplayHomeAsUpEnabled(true)
+        supportActionBar?.setDisplayShowHomeEnabled(true)
+        supportActionBar?.setDisplayShowTitleEnabled(true)
+
+        importlist_recyclerview.layoutManager = LinearLayoutManager(this)
+        importlist_recyclerview.adapter = RecyclerViewAdapter(prefFileListProvider.listPreferenceFiles(loadMetadata = true))
+    }
+
+    inner class RecyclerViewAdapter internal constructor(private var prefFileList: List<PrefsFile>) : RecyclerView.Adapter<RecyclerViewAdapter.PrefFileViewHolder>() {
+
+        inner class PrefFileViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
+            var fileName: TextView = itemView.findViewById(R.id.filelist_name)
+            var fileDir: TextView = itemView.findViewById(R.id.filelist_dir)
+            var metaDateTime: TextView = itemView.findViewById(R.id.meta_date_time)
+            var metaDeviceName: TextView = itemView.findViewById(R.id.meta_device_name)
+            var metaAppVersion: TextView = itemView.findViewById(R.id.meta_app_version)
+            var metaVariantFormat: TextView = itemView.findViewById(R.id.meta_variant_format)
+
+            var metalineName: View = itemView.findViewById(R.id.metaline_name)
+            var metaDateTimeIcon: View = itemView.findViewById(R.id.meta_date_time_icon)
+
+            init {
+                itemView.isClickable = true
+                itemView.setOnClickListener { v: View ->
+                    val prefFile = fileName.tag as PrefsFile
+                    val i = Intent()
+
+                    i.putExtra(PrefsFileContract.OUTPUT_PARAM, prefFile)
+                    setResult(Activity.RESULT_OK, i)
+                    finish()
+                }
+            }
+        }
+
+        override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): PrefFileViewHolder {
+            val v = LayoutInflater.from(parent.context).inflate(R.layout.maintenance_importlist_item, parent, false)
+            return PrefFileViewHolder(v)
+        }
+
+        override fun getItemCount(): Int {
+            return prefFileList.size
+        }
+
+        override fun onBindViewHolder(holder: PrefFileViewHolder, position: Int) {
+            val prefFile = prefFileList[position]
+            holder.fileName.text = prefFile.file.name
+            holder.fileName.tag = prefFile
+
+            holder.fileDir.text = resourceHelper.gs(R.string.in_directory, prefFile.file.parentFile.absolutePath)
+
+            val visible = if (prefFile.handler == PrefsFormatsHandler.CLASSIC) View.GONE else View.VISIBLE
+            holder.metalineName.visibility = visible
+            holder.metaDateTimeIcon.visibility = visible
+            holder.metaAppVersion.visibility = visible
+
+            if (prefFile.handler == PrefsFormatsHandler.CLASSIC) {
+                holder.metaVariantFormat.text = resourceHelper.gs(R.string.metadata_format_old)
+                holder.metaVariantFormat.setTextColor(resourceHelper.gc(R.color.metadataTextWarning))
+                holder.metaDateTime.text = " "
+            } else {
+
+                prefFile.metadata[PrefsMetadataKey.AAPS_FLAVOUR]?.let {
+                    holder.metaVariantFormat.text = it.value
+                    val color = if (it.status == PrefsStatus.OK) R.color.metadataOk else R.color.metadataTextWarning
+                    holder.metaVariantFormat.setTextColor(resourceHelper.gc(color))
+                }
+
+                prefFile.metadata[PrefsMetadataKey.CREATED_AT]?.let {
+                    holder.metaDateTime.text = prefFileListProvider.formatExportedAgo(it.value)
+                }
+
+                prefFile.metadata[PrefsMetadataKey.AAPS_VERSION]?.let {
+                    holder.metaAppVersion.text = it.value
+                    val color = if (it.status == PrefsStatus.OK) R.color.metadataOk else R.color.metadataTextWarning
+                    holder.metaAppVersion.setTextColor(resourceHelper.gc(color))
+                }
+
+                prefFile.metadata[PrefsMetadataKey.DEVICE_NAME]?.let {
+                    holder.metaDeviceName.text = it.value
+                }
+
+            }
+
+        }
+    }
+
+    override fun onOptionsItemSelected(item: MenuItem): Boolean {
+        if (item.itemId == android.R.id.home) {
+            finish()
+            return true
+        }
+        return false
+    }
+
+    public override fun attachBaseContext(newBase: Context) {
+        super.attachBaseContext(LocaleHelper.wrap(newBase))
+    }
+}

app/src/main/java/info/nightscout/androidaps/plugins/general/maintenance/formats/ClassicPrefsFormat.kt

@@ -1,5 +1,6 @@
 package info.nightscout.androidaps.plugins.general.maintenance.formats
 
+import info.nightscout.androidaps.Constants
 import info.nightscout.androidaps.R
 import info.nightscout.androidaps.utils.resources.ResourceHelper
 import info.nightscout.androidaps.utils.storage.Storage
@@ -19,6 +20,11 @@ class ClassicPrefsFormat @Inject constructor(
         val FORMAT_KEY = "aaps_old"
     }
 
+    override fun isPreferencesFile(file: File, preloadedContents: String?): Boolean {
+        val contents = preloadedContents ?: storage.getFileContents(file)
+        return contents.contains("units::" + Constants.MGDL) || contents.contains("units::" + Constants.MMOL)
+    }
+
     override fun savePreferences(file: File, prefs: Prefs, masterPassword: String?) {
         try {
             val contents = prefs.values.entries.joinToString("\n") { entry ->
@@ -35,7 +41,6 @@ class ClassicPrefsFormat @Inject constructor(
     override fun loadPreferences(file: File, masterPassword: String?): Prefs {
         var lineParts: Array<String>
         val entries: MutableMap<String, String> = mutableMapOf()
-        val metadata: MutableMap<PrefsMetadataKey, PrefMetadata> = mutableMapOf()
         try {
 
             val rawLines = storage.getFileContents(file).split("\n")
@@ -46,9 +51,7 @@ class ClassicPrefsFormat @Inject constructor(
                 }
             }
 
-            metadata[PrefsMetadataKey.FILE_FORMAT] = PrefMetadata(FORMAT_KEY, PrefsStatus.WARN, resourceHelper.gs(R.string.metadata_warning_outdated_format))
+            return Prefs(entries, loadMetadata())
-
-            return Prefs(entries, metadata)
 
         } catch (e: FileNotFoundException) {
             throw PrefFileNotFoundError(file.absolutePath)
@@ -57,4 +60,10 @@ class ClassicPrefsFormat @Inject constructor(
         }
     }
 
+    override fun loadMetadata(contents: String?): PrefMetadataMap {
+        val metadata: MutableMap<PrefsMetadataKey, PrefMetadata> = mutableMapOf()
+        metadata[PrefsMetadataKey.FILE_FORMAT] = PrefMetadata(FORMAT_KEY, PrefsStatus.WARN, resourceHelper.gs(R.string.metadata_warning_outdated_format))
+        return metadata
+    }
+
 }

app/src/main/java/info/nightscout/androidaps/plugins/general/maintenance/formats/EncryptedPrefsFormat.kt

@@ -27,6 +27,16 @@ class EncryptedPrefsFormat @Inject constructor(
         val FORMAT_KEY_NOENC = "aaps_structured"
 
         private val KEY_CONSCIENCE = "if you remove/change this, please make sure you know the consequences!"
+        private val FORMAT_TEST_REGEX = Regex("(\\\"format\\\"\\s*\\:\\s*\\\"aaps_[^\"]*\\\")")
+    }
+
+    override fun isPreferencesFile(file: File, preloadedContents: String?): Boolean {
+        return if (file.absolutePath.endsWith(".json")) {
+            val contents = preloadedContents ?: storage.getFileContents(file)
+            FORMAT_TEST_REGEX.containsMatchIn(contents)
+        } else {
+            false
+        }
     }
 
     override fun savePreferences(file: File, prefs: Prefs, masterPassword: String?) {
@@ -97,7 +107,6 @@ class EncryptedPrefsFormat @Inject constructor(
     override fun loadPreferences(file: File, masterPassword: String?): Prefs {
 
         val entries: MutableMap<String, String> = mutableMapOf()
-        val metadata: MutableMap<PrefsMetadataKey, PrefMetadata> = mutableMapOf()
         val issues = LinkedList<String>()
         try {
 
@@ -105,25 +114,11 @@ class EncryptedPrefsFormat @Inject constructor(
             val fileContents = jsonBody.replace(Regex("(?is)(\\\"file_hash\\\"\\s*\\:\\s*\\\")([^\"]*)(\\\")"), "$1--to-be-calculated--$3")
             val calculatedFileHash = cryptoUtil.hmac256(fileContents, KEY_CONSCIENCE)
             val container = JSONObject(jsonBody)
+            val metadata: MutableMap<PrefsMetadataKey, PrefMetadata> = loadMetadata(container)
 
-            if (container.has(PrefsMetadataKey.FILE_FORMAT.key) && container.has("security") && container.has("content") && container.has("metadata")) {
+            if (container.has(PrefsMetadataKey.FILE_FORMAT.key) && container.has("security") && container.has("content")) {
                 val fileFormat = container.getString(PrefsMetadataKey.FILE_FORMAT.key)
-
-                if ((fileFormat != FORMAT_KEY_ENC) && (fileFormat != FORMAT_KEY_NOENC)) {
-                    throw PrefFormatError("Unsupported file format: " + fileFormat)
-                }
-
-                val meta = container.getJSONObject("metadata")
                 val security = container.getJSONObject("security")
-
-                metadata[PrefsMetadataKey.FILE_FORMAT] = PrefMetadata(fileFormat, PrefsStatus.OK)
-                for (key in meta.keys()) {
-                    val metaKey = PrefsMetadataKey.fromKey(key)
-                    if (metaKey != null) {
-                        metadata[metaKey] = PrefMetadata(meta.getString(key), PrefsStatus.OK)
-                    }
-                }
-
                 val encrypted = fileFormat == FORMAT_KEY_ENC
                 var secure: PrefsStatus = PrefsStatus.OK
                 var decryptedOk = false
@@ -208,8 +203,6 @@ class EncryptedPrefsFormat @Inject constructor(
                 }
 
                 metadata[PrefsMetadataKey.ENCRYPTION] = PrefMetadata(encryptionDescStr, secure, issuesStr)
-            } else {
-                metadata[PrefsMetadataKey.FILE_FORMAT] = PrefMetadata(resourceHelper.gs(R.string.prefdecrypt_wrong_json), PrefsStatus.ERROR)
             }
 
             return Prefs(entries, metadata)
@@ -223,4 +216,35 @@ class EncryptedPrefsFormat @Inject constructor(
         }
     }
 
+    override fun loadMetadata(contents: String?): PrefMetadataMap {
+        contents?.let {
+            val container = JSONObject(contents)
+            return loadMetadata(container)
+        }
+        return mutableMapOf()
+    }
+
+    private fun loadMetadata(container: JSONObject): MutableMap<PrefsMetadataKey, PrefMetadata> {
+        val metadata: MutableMap<PrefsMetadataKey, PrefMetadata> = mutableMapOf()
+        if (container.has(PrefsMetadataKey.FILE_FORMAT.key) && container.has("security") && container.has("content") && container.has("metadata")) {
+            val fileFormat = container.getString(PrefsMetadataKey.FILE_FORMAT.key)
+            if ((fileFormat != FORMAT_KEY_ENC) && (fileFormat != FORMAT_KEY_NOENC)) {
+                metadata[PrefsMetadataKey.FILE_FORMAT] = PrefMetadata(resourceHelper.gs(R.string.metadata_format_other), PrefsStatus.ERROR)
+            } else {
+                val meta = container.getJSONObject("metadata")
+                metadata[PrefsMetadataKey.FILE_FORMAT] = PrefMetadata(fileFormat, PrefsStatus.OK)
+                for (key in meta.keys()) {
+                    val metaKey = PrefsMetadataKey.fromKey(key)
+                    if (metaKey != null) {
+                        metadata[metaKey] = PrefMetadata(meta.getString(key), PrefsStatus.OK)
+                    }
+                }
+            }
+        } else {
+            metadata[PrefsMetadataKey.FILE_FORMAT] = PrefMetadata(resourceHelper.gs(R.string.prefdecrypt_wrong_json), PrefsStatus.ERROR)
+        }
+
+        return metadata;
+    }
+
 }

app/src/main/java/info/nightscout/androidaps/plugins/general/maintenance/formats/PrefsFormat.kt

@@ -1,12 +1,14 @@
 package info.nightscout.androidaps.plugins.general.maintenance.formats
 
 import android.content.Context
+import android.os.Parcelable
 import androidx.annotation.DrawableRes
 import androidx.annotation.StringRes
 import info.nightscout.androidaps.R
+import kotlinx.android.parcel.Parcelize
 import java.io.File
 
-enum class PrefsMetadataKey(val key: String, @DrawableRes val icon:Int, @StringRes val label:Int) {
+enum class PrefsMetadataKey(val key: String, @DrawableRes val icon: Int, @StringRes val label: Int) {
 
     FILE_FORMAT("format", R.drawable.ic_meta_format, R.string.metadata_label_format),
     CREATED_AT("created_at", R.drawable.ic_meta_date, R.string.metadata_label_created_at),
@@ -33,10 +35,9 @@ enum class PrefsMetadataKey(val key: String, @DrawableRes val icon:Int, @StringR
             }
         }
 
-
     }
 
-    fun formatForDisplay(context: Context, value:String): String {
+    fun formatForDisplay(context: Context, value: String): String {
         return when (this) {
             FILE_FORMAT -> when (value) {
                 ClassicPrefsFormat.FORMAT_KEY         -> context.getString(R.string.metadata_format_old)
@@ -51,16 +52,21 @@ enum class PrefsMetadataKey(val key: String, @DrawableRes val icon:Int, @StringR
 
 }
 
-data class PrefMetadata(var value : String, var status : PrefsStatus, var info : String? = null)
+@Parcelize
+data class PrefMetadata(var value: String, var status: PrefsStatus, var info: String? = null) : Parcelable
 
-data class Prefs(val values : Map<String, String>, var metadata : Map<PrefsMetadataKey, PrefMetadata>)
+typealias PrefMetadataMap = Map<PrefsMetadataKey, PrefMetadata>
+
+data class Prefs(val values: Map<String, String>, var metadata: PrefMetadataMap)
 
 interface PrefsFormat {
     fun savePreferences(file: File, prefs: Prefs, masterPassword: String? = null)
-    fun loadPreferences(file: File, masterPassword: String? = null) : Prefs
+    fun loadPreferences(file: File, masterPassword: String? = null): Prefs
+    fun loadMetadata(contents: String? = null): PrefMetadataMap
+    fun isPreferencesFile(file: File, preloadedContents: String? = null): Boolean
 }
 
-enum class PrefsStatus(@DrawableRes val icon:Int) {
+enum class PrefsStatus(@DrawableRes val icon: Int) {
     OK(R.drawable.ic_meta_ok),
     WARN(R.drawable.ic_meta_warning),
     ERROR(R.drawable.ic_meta_error),
@@ -68,6 +74,11 @@ enum class PrefsStatus(@DrawableRes val icon:Int) {
     DISABLED(R.drawable.ic_meta_error)
 }
 
+enum class PrefsFormatsHandler {
+    CLASSIC,
+    ENCRYPTED
+}
+
 class PrefFileNotFoundError(message: String) : Exception(message)
 class PrefIOError(message: String) : Exception(message)
 class PrefFormatError(message: String) : Exception(message)

app/src/main/res/layout/maintenance_importlist_activity.xml

@@ -0,0 +1,24 @@
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context="info.nightscout.androidaps.plugins.general.maintenance.activities.PrefImportListActivity">
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:layout_marginTop="4dp"
+        android:orientation="vertical">
+
+        <androidx.recyclerview.widget.RecyclerView
+            android:id="@+id/importlist_recyclerview"
+            android:layout_width="match_parent"
+            android:scrollbars="vertical"
+            android:fadeScrollbars="true"
+            android:scrollbarStyle="outsideOverlay"
+            android:layout_height="match_parent">
+
+        </androidx.recyclerview.widget.RecyclerView>
+    </LinearLayout>
+
+</FrameLayout>

app/src/main/res/layout/maintenance_importlist_item.xml

@@ -0,0 +1,169 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:card_view="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/careportal_cardview"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:layout_gravity="center"
+    card_view:cardBackgroundColor="?android:colorBackground">
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="1dp"
+        android:layout_marginBottom="3dp"
+        android:orientation="vertical">
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:baselineAligned="true"
+            android:orientation="horizontal">
+
+            <ImageView
+                android:layout_width="18dp"
+                android:layout_height="18dp"
+                android:layout_marginStart="5dp"
+                android:layout_marginTop="4dp"
+                android:layout_marginEnd="6dp"
+                android:layout_marginBottom="1dp"
+                android:src="@drawable/ic_meta_format"
+                android:tint="@color/importListFileName" />
+
+            <TextView
+                android:id="@+id/filelist_name"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:ellipsize="none"
+                android:maxLines="2"
+                android:paddingEnd="10dp"
+                android:scrollHorizontally="false"
+                android:text="File name here"
+                android:textAppearance="?android:attr/textAppearanceMedium"
+                android:textColor="@color/importListFileName"
+                tools:ignore="HardcodedText" />
+
+
+        </LinearLayout>
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:baselineAligned="true"
+            android:orientation="horizontal">
+
+            <TextView
+                android:id="@+id/filelist_dir"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_marginStart="29dp"
+                android:layout_weight="1"
+                android:ellipsize="none"
+                android:maxLines="2"
+
+                android:paddingEnd="10dp"
+                android:scrollHorizontally="false"
+                android:text="File dir here"
+                android:textAppearance="?android:attr/textAppearanceSmall"
+                android:textColor="@color/importListFileName"
+                android:textSize="11sp"
+                tools:ignore="HardcodedText" />
+
+
+        </LinearLayout>
+
+        <LinearLayout
+            android:id="@+id/metaline_name"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:layout_marginTop="6dp"
+            android:orientation="horizontal">
+
+            <ImageView
+
+                android:layout_width="16dp"
+                android:layout_height="16dp"
+                android:layout_marginStart="30dp"
+                android:layout_marginTop="1dp"
+                android:layout_marginEnd="8dp"
+                android:layout_marginBottom="1dp"
+                android:src="@drawable/ic_meta_name"
+                android:tint="@color/importListAdditionalInfo" />
+
+            <TextView
+                android:id="@+id/meta_device_name"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:text="exported on this Patient phone"
+                android:textAppearance="?android:attr/textAppearanceSmall"
+                android:textColor="@color/importListAdditionalInfo"
+                tools:ignore="HardcodedText" />
+
+
+        </LinearLayout>
+
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:layout_marginTop="3dp"
+            android:orientation="horizontal">
+
+
+            <ImageView
+                android:id="@+id/meta_date_time_icon"
+                android:layout_width="16dp"
+                android:layout_height="16dp"
+                android:layout_marginStart="30dp"
+                android:layout_marginTop="1dp"
+                android:layout_marginEnd="8dp"
+                android:layout_marginBottom="1dp"
+                android:src="@drawable/ic_meta_date"
+                android:tint="@color/importListAdditionalInfo" />
+
+            <TextView
+                android:id="@+id/meta_date_time"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:text="exported how long ago"
+                android:textAppearance="?android:attr/textAppearanceSmall"
+                android:textColor="@color/importListAdditionalInfo"
+                tools:ignore="HardcodedText" />
+
+            <TextView
+                android:id="@+id/meta_app_version"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginEnd="10dp"
+                android:text="v10.10.10.10"
+                android:textColor="@color/metadataTextWarning"
+                tools:ignore="HardcodedText" />
+
+            <TextView
+                android:id="@+id/meta_variant_format"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginEnd="10dp"
+                android:text="FLAVOUR"
+                android:textColor="@color/metadataOk"
+                tools:ignore="HardcodedText" />
+
+        </LinearLayout>
+
+
+        <View
+            android:layout_width="fill_parent"
+            android:layout_height="2dip"
+            android:layout_marginStart="5dp"
+            android:layout_marginTop="7dp"
+            android:layout_marginEnd="5dp"
+            android:layout_marginBottom="3dp"
+            android:background="@color/listdelimiter" />
+
+    </LinearLayout>
+
+</androidx.cardview.widget.CardView>

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

@@ -90,7 +90,11 @@
     <color name="toastWarn">#FF8C00</color>
     <color name="toastInfo">#03A9F4</color>
 
+    <color name="metadataOk">#77dd77</color>
     <color name="metadataTextWarning">#FF8C00</color>
     <color name="metadataTextError">#FF5555</color>
 
+    <color name="importListFileName">#FFFFFF</color>
+    <color name="importListAdditionalInfo">#BBBBBB</color>
+
 </resources>

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

@@ -257,6 +257,8 @@
     <string name="preferences_export_canceled">Export canceled! Preferences were NOT exported!</string>
     <string name="preferences_import_canceled">Import canceled! Preferences were NOT imported!</string>
 
+    <string name="preferences_import_list_title">Select file to import</string>
+
     <string name="check_preferences_before_import">Please check preferences before importing:</string>
     <string name="check_preferences_cannot_import">Preferences cannot be imported!</string>
     <string name="check_preferences_dangerous_import">Preferences should not be imported!</string>
@@ -270,6 +272,8 @@
     <string name="metadata_warning_outdated_format">You are using the outdated legacy format from old versions of AAPS, which is not secure! Only use it as a last resort, if you do not have an export in current, JSON format.</string>
     <string name="metadata_warning_old_export">Imported preferences are already %1$s days old! Maybe you have more up-to-date preferences or you choose the wrong file? Remember to export preferences regularly!</string>
     <string name="metadata_warning_date_format">Invalid date-time format!</string>
+    <string name="metadata_warning_different_version">Preferences from different minor version of application. It is OK if you are importing after upgrade, but check after import if preferences are still correct!</string>
+    <string name="metadata_urgent_different_version">Preferences from different major version of application. Major versions differ significantly and may have incompatible preferences! Make sure after import that preferences are still correct!</string>
 
     <string name="metadata_label_format">File format</string>
     <string name="metadata_label_created_at">Created at</string>
@@ -297,6 +301,12 @@
     <string name="prefdecrypt_issue_wrong_format">Missing encryption configuration, settings format is invalid!</string>
     <string name="prefdecrypt_issue_wrong_algorithm">Unsupported or not specified encryption algorithm!</string>
 
+    <string name="exported_today">exported today</string>
+    <string name="exported_ago" comment="at placeholder we add pluralized number of hours/minutes">exported %1$s ago</string>
+    <string name="exported_at" comment="at placeholder we add export date">exported at %1$s</string>
+    <string name="exported_less_than_hour_ago">exported less than hour ago</string>
+    <string name="in_directory" comment="placeholder is for exported file path">in directory: %1$s</string>
+
     <string name="danarpump">DanaR</string>
     <string name="connecting">Connecting</string>
     <string name="connected">Connected</string>

app/src/test/java/info/nightscout/androidaps/plugins/constraints/versionChecker/VersionCheckerUtilsKtTest.kt

@@ -6,6 +6,7 @@ import info.nightscout.androidaps.logging.AAPSLogger
 import info.nightscout.androidaps.plugins.bus.RxBusWrapper
 import info.nightscout.androidaps.utils.resources.ResourceHelper
 import info.nightscout.androidaps.utils.sharedPreferences.SP
+import org.junit.Assert.assertArrayEquals
 import org.junit.Assert.assertEquals
 import org.junit.Before
 import org.junit.Test
@@ -25,6 +26,41 @@ class VersionCheckerUtilsKtTest : TestBase() {
         versionCheckerUtils = VersionCheckerUtils(aapsLogger, sp, resourceHelper, rxBus, context)
     }
 
+    @Test
+    fun `should handle invalid version`() {
+        assertArrayEquals(intArrayOf(), versionCheckerUtils.versionDigits("definitely not version string"))
+    }
+
+    @Test
+    fun `should handle empty version`() {
+        assertArrayEquals(intArrayOf(), versionCheckerUtils.versionDigits(""))
+    }
+
+    @Test
+    fun `should parse 2 digit version`() {
+        assertArrayEquals(intArrayOf(0, 999), versionCheckerUtils.versionDigits("0.999-beta"))
+    }
+
+    @Test
+    fun `should parse 3 digit version`() {
+        assertArrayEquals(intArrayOf(6, 83, 93), versionCheckerUtils.versionDigits("6.83.93"))
+    }
+
+    @Test
+    fun `should parse 4 digit version`() {
+        assertArrayEquals(intArrayOf(42, 7, 13, 101), versionCheckerUtils.versionDigits("42.7.13.101"))
+    }
+
+    @Test
+    fun `should parse 4 digit version with extra`() {
+        assertArrayEquals(intArrayOf(1, 2, 3, 4), versionCheckerUtils.versionDigits("1.2.3.4-RC5"))
+    }
+
+    @Test
+    fun `should parse version but only 4 digits are taken`() {
+        assertArrayEquals(intArrayOf(67, 8, 31, 5), versionCheckerUtils.versionDigits("67.8.31.5.153.4.2"))
+    }
+
     /*
         @Test
         fun `should keep 2 digit version`() {