Prepare db migration

app/src/main/java/org/pixeldroid/app/MainActivity.kt

@@ -72,8 +72,8 @@ class MainActivity : BaseActivity() {
 
         //Check if we have logged in and gotten an access token
         if (user == null) {
-            launchActivity(LoginActivity(), firstTime = true)
             finish()
+            launchActivity(LoginActivity(), firstTime = true)
         } else {
             sendTraceDroidStackTracesIfExist("contact@pixeldroid.org", this)
 
@@ -172,6 +172,7 @@ class MainActivity : BaseActivity() {
     }
 
     private fun logOut(){
+        finish()
         db.runInTransaction {
             db.userDao().deleteActiveUsers()
 
@@ -229,6 +230,8 @@ class MainActivity : BaseActivity() {
         apiHolder.setToCurrentUser()
         val intent = Intent(this, MainActivity::class.java)
         intent.flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK
+
+        finish()
         startActivity(intent)
 
         return false

app/src/main/java/org/pixeldroid/app/posts/PostActivity.kt

@@ -38,8 +38,8 @@ class PostActivity : BaseActivity() {
         supportActionBar?.setDisplayHomeAsUpEnabled(true)
 
         status = intent.getSerializableExtra(POST_TAG) as Status
-        val viewComments: Boolean = (intent.getSerializableExtra(VIEW_COMMENTS_TAG) ?: false) as Boolean
-        val postComment: Boolean = (intent.getSerializableExtra(POST_COMMENT_TAG) ?: false) as Boolean
+        val viewComments: Boolean = intent.getBooleanExtra(VIEW_COMMENTS_TAG, false)
+        val postComment: Boolean = intent.getBooleanExtra(POST_COMMENT_TAG, false)
 
         val user = db.userDao().getActiveUser()
 

app/src/main/java/org/pixeldroid/app/posts/feeds/cachedFeeds/notifications/NotificationsFragment.kt

@@ -249,7 +249,7 @@ class NotificationsFragment : CachedFeedFragment<Notification>() {
 
         override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
             val uiModel = getItem(position)
-            uiModel.let {
+            uiModel?.let {
                 (holder as NotificationViewHolder).bind(
                         it,
                         apiHolder,

app/src/main/java/org/pixeldroid/app/utils/db/AppDatabase.kt

@@ -3,6 +3,8 @@ package org.pixeldroid.app.utils.db
 import androidx.room.Database
 import androidx.room.RoomDatabase
 import androidx.room.TypeConverters
+import androidx.room.migration.Migration
+import androidx.sqlite.db.SupportSQLiteDatabase
 import org.pixeldroid.app.utils.db.dao.*
 import org.pixeldroid.app.utils.db.dao.feedContent.NotificationDao
 import org.pixeldroid.app.utils.db.dao.feedContent.posts.HomePostDao
@@ -29,4 +31,12 @@ abstract class AppDatabase : RoomDatabase() {
     abstract fun homePostDao(): HomePostDao
     abstract fun publicPostDao(): PublicPostDao
     abstract fun notificationDao(): NotificationDao
+}
+
+val MIGRATION_3_4 = object : Migration(3, 4) {
+    override fun migrate(database: SupportSQLiteDatabase) {
+        database.execSQL("DELETE FROM homePosts")
+        database.execSQL("DELETE FROM publicPosts")
+        database.execSQL("DELETE FROM notifications")
+    }
 }

app/src/main/java/org/pixeldroid/app/utils/di/DatabaseModule.kt

@@ -5,6 +5,7 @@ import androidx.room.Room
 import org.pixeldroid.app.utils.db.AppDatabase
 import dagger.Module
 import dagger.Provides
+import org.pixeldroid.app.utils.db.MIGRATION_3_4
 import javax.inject.Singleton
 
 @Module
@@ -16,6 +17,6 @@ class DatabaseModule(private val context: Context) {
         return Room.databaseBuilder(
             context,
             AppDatabase::class.java, "pixeldroid"
-        ).allowMainThreadQueries().build()
+        ).addMigrations(MIGRATION_3_4).allowMainThreadQueries().build()
     }
 }