Replace Illegal{State,Argument} exceptions with more idiomatic kotlin code

app/src/main/java/org/schabi/newpipe/about/AboutActivity.kt

@@ -92,7 +92,7 @@ class AboutActivity : AppCompatActivity() {
             return when (position) {
                 posAbout -> AboutFragment()
                 posLicense -> LicenseFragment.newInstance(SOFTWARE_COMPONENTS)
-                else -> throw IllegalArgumentException("Unknown position for ViewPager2")
+                else -> error("Unknown position for ViewPager2")
             }
         }
 
@@ -105,7 +105,7 @@ class AboutActivity : AppCompatActivity() {
             return when (position) {
                 posAbout -> R.string.tab_about
                 posLicense -> R.string.tab_licenses
-                else -> throw IllegalArgumentException("Unknown position for ViewPager2")
+                else -> error("Unknown position for ViewPager2")
             }
         }
     }

app/src/main/java/org/schabi/newpipe/database/stream/dao/StreamDAO.kt

@@ -87,7 +87,7 @@ abstract class StreamDAO : BasicDAO<StreamEntity> {
 
     private fun compareAndUpdateStream(newerStream: StreamEntity) {
         val existentMinimalStream = getMinimalStreamForCompare(newerStream.serviceId, newerStream.url)
-            ?: throw IllegalStateException("Stream cannot be null just after insertion.")
+            ?: error("Stream cannot be null just after insertion.")
         newerStream.uid = existentMinimalStream.uid
 
         if (!StreamTypeUtil.isLiveStream(newerStream.streamType)) {

app/src/main/java/org/schabi/newpipe/database/subscription/SubscriptionDAO.kt

@@ -100,7 +100,7 @@ abstract class SubscriptionDAO : BasicDAO<SubscriptionEntity> {
                 entity.uid = uidFromInsert
             } else {
                 val subscriptionIdFromDb = getSubscriptionIdInternal(entity.serviceId, entity.url!!)
-                    ?: throw IllegalStateException("Subscription cannot be null just after insertion.")
+                    ?: error("Subscription cannot be null just after insertion.")
                 entity.uid = subscriptionIdFromDb
 
                 update(entity)

app/src/main/java/org/schabi/newpipe/player/mediabrowser/MediaBrowserCommon.kt

@@ -22,7 +22,7 @@ internal fun infoItemTypeToString(type: InfoType): String {
         InfoType.STREAM -> ID_STREAM
         InfoType.PLAYLIST -> ID_PLAYLIST
         InfoType.CHANNEL -> ID_CHANNEL
-        else -> throw IllegalStateException("Unexpected value: $type")
+        else -> error("Unexpected value: $type")
     }
 }
 
@@ -31,7 +31,7 @@ internal fun infoItemTypeFromString(type: String): InfoType {
         ID_STREAM -> InfoType.STREAM
         ID_PLAYLIST -> InfoType.PLAYLIST
         ID_CHANNEL -> InfoType.CHANNEL
-        else -> throw IllegalStateException("Unexpected value: $type")
+        else -> error("Unexpected value: $type")
     }
 }
 

app/src/main/java/org/schabi/newpipe/player/mediabrowser/PackageValidator.kt

@@ -82,11 +82,11 @@ internal class PackageValidator(context: Context) {
 
         // Build the caller info for the rest of the checks here.
         val callerPackageInfo = buildCallerInfo(callingPackage)
-            ?: throw IllegalStateException("Caller wasn't found in the system?")
+            ?: error("Caller wasn't found in the system?")
 
         // Verify that things aren't ... broken. (This test should always pass.)
-        if (callerPackageInfo.uid != callingUid) {
-            throw IllegalStateException("Caller's package UID doesn't match caller's actual UID?")
+        check(callerPackageInfo.uid != callingUid) {
+            "Caller's package UID doesn't match caller's actual UID?"
         }
 
         val callerSignature = callerPackageInfo.signature
@@ -202,7 +202,7 @@ internal class PackageValidator(context: Context) {
      */
     private fun getSystemSignature(): String = getPackageInfo(ANDROID_PLATFORM)?.let { platformInfo ->
         getSignature(platformInfo)
-    } ?: throw IllegalStateException("Platform signature not found")
+    } ?: error("Platform signature not found")
 
     /**
      * Creates a SHA-256 signature given a certificate byte array.