Fix various Kotlin nullability errors

Author: pimterry

app/src/main/java/tech/httptoolkit/android/HttpToolkitApplication.kt

@@ -248,7 +248,7 @@ class HttpToolkitApplication : Application() {
                     tryParseSemver(release.name)
                     ?: tryParseSemver(release.tag_name)
                     ?: throw RuntimeException("Could not parse release version ${release.tag_name}")
-                val releaseDate = SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss").parse(release.published_at)
+                val releaseDate = SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss").parse(release.published_at)!!
 
                 val installedVersion = getInstalledVersion(this@HttpToolkitApplication)
 

app/src/main/java/tech/httptoolkit/android/MainActivity.kt

@@ -457,7 +457,7 @@ class MainActivity : AppCompatActivity(), CoroutineScope by MainScope() {
                     putExtra(PROXY_CONFIG_EXTRA, currentProxyConfig)
                 })
             } else if (requestCode == SCAN_REQUEST && data != null) {
-                val url = data.getStringExtra(SCANNED_URL_EXTRA)
+                val url = data.getStringExtra(SCANNED_URL_EXTRA)!!
                 launch { connectToVpnFromUrl(url) }
             }
         } else {

app/src/main/java/tech/httptoolkit/android/ProxyVpnRunnable.kt

@@ -79,7 +79,8 @@ class ProxyVpnRunnable(
                         handler.handlePacket(packet)
                     } catch (e: Exception) {
                         Sentry.capture(e)
-                        Log.e(TAG, e.message)
+                        val errorMessage = e.message ?: e.toString()
+                        Log.e(TAG, errorMessage)
                     }
 
                     packet.clear()

app/src/main/java/tech/httptoolkit/android/ProxyVpnService.kt

@@ -67,7 +67,7 @@ class ProxyVpnService : VpnService(), IProtectSocket {
     override fun onStartCommand(intent: Intent, flags: Int, startId: Int): Int {
         currentService = this
         Log.i(TAG, "onStartCommand called")
-        Log.i(TAG, if (intent.action != null) intent.action else "no action")
+        Log.i(TAG, intent.action ?: "no action")
 
         if (localBroadcastManager == null) {
             localBroadcastManager = LocalBroadcastManager.getInstance(this)
@@ -77,7 +77,7 @@ class ProxyVpnService : VpnService(), IProtectSocket {
         if (intent.action == START_VPN_ACTION) {
             val proxyConfig = intent.getParcelableExtra<ProxyConfig>(PROXY_CONFIG_EXTRA)
 
-            val vpnStarted = startVpn(proxyConfig)
+            val vpnStarted = startVpn(proxyConfig!!)
 
             if (vpnStarted) {
                 // If the system briefly kills us for some reason (memory, the user, whatever) whilst