Migration of Item management to SharedItems (#345)

* Refactor Item addition and deletion

* Metods to filter the items according to read and starred status

* Remove displayed items only if displaying unread items

* Remove unnecessary api calls on tab change and delegate item storage to SharedItems

* Store articles in SharedItems when they get fetched

* Add tag filtering

* Mark items as read

* Disable sorting function

* Add function to get the unread status of an element.

* Fetch items on pull gesture

* Move marking as read logic in SharedItems.

* Delegate item status to SharedItems

* Allow changing unread status of items

* Use full article position reference and not the relative one

* Delegate marking items as unread to SharedItems

* Delegate database addition of Items to SharedItems.

* Function to only provide connectivity information

* Better database management

* Sort items by date

* Provide information about item caching to SharedItems

* Add missing imports

* Update database after fetching articles

* Add missing variable

* Remove unused import

* Use coroutines to access database

* Use coroutines to simultaneously fetch articles.

* Update database after fetching articles.

* Don't block thread when accessing the database

* Prevent crash if connectivity is lost while fetching articles

* Show "Not connected" snackbar if there is no connection or connection is lost during download

* Use coroutines in the background sync

* Added function to get only new items

* Introduced function to filter articles

* Don't execute background sync if the option is disabled

* Improve item filtering

* Apply filters when they are selected on the UI

* Handle infinite scroll

* Incorrect parameters were passed

* Simplify tab selection logic

* Upgrade kotlin jvm to version 1.8

* On tab change fetch new items if the item list is not completely populated

* Remove redundant assignations.

* Fetch articles when changing tag, source or search if the list is not fully populated

* Fetch only the article in the tab selected

* Correct inconsistent position address

* Disable swiping articles only if favorites are selected

* Delegate badge count to SharedItems

* Clear the database when the app starts in order to avoid accumulation and inconsistencies

* Remove unused functions and variables

* Do not overwrite fetched items with old copies from the database

* Display "There's nothing here" only if there are no articles

* Adapt function to read all articles to the new changes

* Use IO Dispatcher for Database and Network computations

* Adapt Background sync to the usage of SharedItems

* Handle refresh gesture appropriately by refreshing the whole items list

* Remove unused imports

app/build.gradle

@@ -82,6 +82,9 @@ android {
             dimension "build"
         }
     }
+    kotlinOptions {
+        jvmTarget = '1.8'
+    }
 }
 
 dependencies {
@@ -113,10 +116,13 @@ dependencies {
         transitive = true
     }
 
+    // Async
+    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.3.9'
+
     // Retrofit + http logging + okhttp
-    implementation 'com.squareup.retrofit2:retrofit:2.3.0'
+    implementation 'com.squareup.retrofit2:retrofit:2.9.0'
     implementation 'com.squareup.okhttp3:logging-interceptor:3.9.0'
-    implementation 'com.squareup.retrofit2:converter-gson:2.3.0'
+    implementation 'com.squareup.retrofit2:converter-gson:2.9.0'
     implementation 'com.burgstaller:okhttp-digest:1.12'
 
     // Material-ish things
@@ -148,6 +154,7 @@ dependencies {
     implementation "androidx.lifecycle:lifecycle-common-java8:2.3.0-rc01"
 
     implementation "androidx.room:room-runtime:2.3.0-alpha04"
+    implementation "androidx.room:room-ktx:2.3.0-alpha04"
     kapt "androidx.room:room-compiler:2.3.0-alpha04"
 
     implementation "android.arch.work:work-runtime-ktx:$work_version"