* Flush the json data after writing it, otherwise if the app process dies, we end up with an empty file.
GSON deserializes this into a null object that looks like a non-null object until it is evaluated some time later.

Force an evaluation via `require(it.size >= 0)` and delete the corrupt data file when catching the exception.

* Show a visible error dialog if we fail to save data.

* Used buffered versions of readers and writer.

* Regex updated and new test cases added

* test cases refactored, regex improvement, obsolete tests removed

* Fixed lived data in VM being filtered resulting in issue where it wouldn't be updated in the future

* Removed unused imports

* Delete Project.xml

Removed unnecessary file.

* Forgot to add if statement in observer

* Revert Project.xml

Change-Id: Icbc05a9bc4c2d638335e918ece24bf772769b4c0

Version bump

Co-authored-by: Matthias Urhahn <matthias.urhahn@sap.com>

1.5.x into 1.6.x

# Conflicts:
#	Corona-Warn-App/build.gradle
#	Corona-Warn-App/src/main/java/de/rki/coronawarnapp/ui/main/MainFragment.kt

* Added logic for showing notification on risk level change

* Got rid of magic number

* Fixed ktlint issue

* Notification only shows up when risk card goes from red to green

* Showing dialog onResume

* Added static string for preference key and renamed method to better reflect usage

* Whether not weather

* Showing dialog is handled by the VM

* Fixed ktlint error

* Fixed an issue where the dialog would be shown only after navigating back to the home fragment.

* Move decision logic for showing the lowered risk into the viewmodel.

* Make the lowered risk level score event observable.

* Fix wrong init value used for testing.

* Update strings.xml

* Fix test regressions due to static LocalData access.

Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>
Co-authored-by: Matthias Urhahn <matthias.urhahn@sap.com>

* Refactored DataRetentionHelper class to use injection

* Added ViewModel to SettingsReset

* Add a clear cache method to AppConfigProvider.kt

* Fixed repository live data containing stale data after app reset.

* Moved logic from fragment to view model.

* Adjusted tests to accommodate AppConfigProvider changes

* Reverted back last 2 commits and downgraded ktlint plugin

* Fixed DI issue

* Put the scope in the hands of the VM

* Deleted unused imports

* Removed unused imports from VM

* Use injected dispatcher provider to simplify testing.

Co-authored-by: Matthias Urhahn <matthias.urhahn@sap.com>
Co-authored-by: AlexanderAlferov <64849422+AlexanderAlferov@users.noreply.github.com>
Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>

Retry the reset for v1.6.0+ as the failed reset attempt in 1.5.0 may have consumed the reset attempt already. (#1492)

* Cleaner log and remove superfluos removal, if we replace the entry anyways, we don't have to remove it.

* Only propagate changes if the data actually changed.

Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>

Change-Id: Ie90db444d051c7d37eadfbe1f1e1e5205804eab1

Co-authored-by: Ralf Gehrer <ralfgehrer@users.noreply.github.com>

Homescreen Notifications, even though keys were submitted (EXPOSUREAPP-3181, EXPOSUREAPP-3182) (#1418)

* Added additional checks to notification of exposure/test-result to check for finished submission

Signed-off-by: Kolya Opahle <k.opahle@sap.com>

* Small changes to code style

Signed-off-by: Kolya Opahle <k.opahle@sap.com>

Co-authored-by: Matthias Urhahn <matthias.urhahn@sap.com>
Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>

* Two new progress states for the risk card+details.

* Add unit tests for new card states.

* Flatten UI of risk card to improve layouting performance on slow devices.

* Remove stale strings from other translations.

* UX wants the ... ¯\_(ツ)_/¯

Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>

* ProtoBuf Update at Wed Oct 21 13:15:13 UTC 2020 #1448

* Switch to centralized ProtoBuf format (EXPOSUREAPP-3404) (#1455)

* Switch to centralized ProtoBuf format and fix imports (EXPOSUREAPP-3404)

* Fix ktlint issues

Co-authored-by: Maximilian Lenkeit <mlenkeit@users.noreply.github.com>
Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>
Co-authored-by: Matthias Urhahn <matthias.urhahn@sap.com>

* Add a `CalcluationTracker` class that can tell us about the ENF's calcluations.

* Introduces new reactive data provider "HotData" that allows lazy init and safe updates.

* Add calculation time out enforcer (60min), check every 5min.

* Show `isRefreshing` when we are either downloading keys or the ENF is still calculating.

* Rename "token" to "identifier", we'll likely keep using this class for ENF Window Mode,
which has no more "tokens".

* Remove "state", we can only know whether it's running and that can be based on the `finishedAt` timestamp.
Also improve test readability a bit and added more edge cases when checking timeouts.

* Additional test cases for ENF calculation edge cases

* We are fine with tracking the last 5 calculations.

* Exclude timeouts from `latestFinishedCalculation`

* HotData should be named HotDataFlow

* Clean up coroutine/flow packages.

* Remove additional combineTransform instances, to prevent accidental casting errors in the future.

* We should only forward calls to the provider and the calculation tracker if the list of key files is non-empty.

* Add unit test to check for GSON data class restoration behavior with transient fields.
GSON sets it to false, and does not eval the properties to set them.

* Lints, Lints, Lints

* Only check the calculation status of the newest submission.
The chance for overlapping calculations is rare with batched key submission,
and if gives us a lower chance of actually being affected by timeouts.

* Reduce timeout for tracked calculations to 15 minutes after discussion with Maximilian.
In worst case scenarios no calculation exceeded 7 minutes.

* Reduce timeout check interval to 3 minutes, due to lowered overall timeout limit.

* Add additional test case that checks that a late result, past timeout, overwrites the timeout.

* Create `BaseGson` instance within the DI graph use it.
Allows use to later set global settings (pretty print for testers?),
or hook up custom serializers app-wide.

Cannot delete tests older than 21 days - DE: Tests die älter als 21 Tage sind, können nicht gelöscht werden (EXPOSUREAPP-2398) (#1481)

* Added new card to show redeemed tests on the home screen

Signed-off-by: Kolya Opahle <k.opahle@sap.com>

* Fixed linting and unit tests

Signed-off-by: Kolya Opahle <k.opahle@sap.com>

Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>

Co-authored-by: Ralf Gehrer <ralfgehrer@users.noreply.github.com>

Typo.

Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>
Co-authored-by: Ralf Gehrer <ralfgehrer@users.noreply.github.com>

* Deadman notification text for translation

* Fixed typo

* Removed background priority settings from the settings ui

* Revert "Removed background priority settings from the settings ui"

This reverts commit c0447a1a52da6a4bc33aac01ceb28afce049cf98.

* Removed background priority switch from settings ui and replaced with intent to open settings,
also replaced in notification on first launch

Signed-off-by: Kolya Opahle <k.opahle@sap.com>

* Card is now always visible and changed text

Signed-off-by: Kolya Opahle <k.opahle@sap.com>

* Revert "Card is now always visible and changed text"

This reverts commit cae7c0fcc4575c67fb1a3d12b8a304a2416543f0.

* Added new german strings to status card and made it permanently visible

* Removed unnecessary constraint layout from xml file

Signed-off-by: Kolya Opahle <k.opahle@sap.com>

* Removed additional unneeded constraint layout

Signed-off-by: Kolya Opahle <k.opahle@sap.com>

Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>
Co-authored-by: Ralf Gehrer <ralfgehrer@users.noreply.github.com>

* Fix text issues for low risk with 0/1+ encounters (EXPOSUREAPP-3193)

* revert deletion of default string

Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>

Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>

* move strings

* added default strings

* fixed comment indention

* CircleCI config change for streamlined RC naming

* Version bump

Co-authored-by: Ralf Gehrer <ralfgehrer@users.noreply.github.com>

Co-authored-by: Ralf Gehrer <ralfgehrer@users.noreply.github.com>

* Build.gradle signing fix

* Test config.yml

* Clean up

Co-authored-by: Ralf Gehrer <ralfgehrer@users.noreply.github.com>