don't crash on devices without nfc

app/src/main/java/org/mosad/seil0/projectlaogai/MainActivity.kt

@@ -23,10 +23,12 @@
 package org.mosad.seil0.projectlaogai
 
 import android.app.PendingIntent
+import android.content.Context
 import android.content.Intent
 import android.content.IntentFilter
 import android.graphics.Color
 import android.nfc.NfcAdapter
+import android.nfc.NfcManager
 import android.nfc.tech.NfcA
 import android.os.Bundle
 import android.view.Menu
@@ -58,6 +60,7 @@ class MainActivity : AppCompatActivity(), NavigationView.OnNavigationItemSelecte
     private lateinit var pendingIntent: PendingIntent
     private lateinit var intentFiltersArray: Array<IntentFilter>
     private lateinit var techListsArray: Array<Array<String>>
+    private var useNFC = false
 
     override fun onCreate(savedInstanceState: Bundle?) {
         Aesthetic.attach(this)
@@ -99,6 +102,7 @@ class MainActivity : AppCompatActivity(), NavigationView.OnNavigationItemSelecte
     override fun onResume() {
         super.onResume()
         Aesthetic.resume(this)
+        if(useNFC)
             adapter.enableForegroundDispatch(this, pendingIntent, intentFiltersArray, techListsArray)
 
     }
@@ -106,6 +110,7 @@ class MainActivity : AppCompatActivity(), NavigationView.OnNavigationItemSelecte
     override fun onPause() {
         super.onPause()
         Aesthetic.pause(this)
+        if(useNFC)
             adapter.disableForegroundDispatch(this)
     }
 
@@ -189,6 +194,11 @@ class MainActivity : AppCompatActivity(), NavigationView.OnNavigationItemSelecte
     }
 
     private fun initForegroundDispatch() {
+        val nfcManager = this.getSystemService(Context.NFC_SERVICE) as NfcManager
+        val nfcAdapter = nfcManager.defaultAdapter
+
+        if (nfcAdapter != null) {
+            useNFC = true
             intentFiltersArray = arrayOf(IntentFilter(NfcAdapter.ACTION_NDEF_DISCOVERED).apply { addDataType("*/*") })
             techListsArray = arrayOf(arrayOf(NfcA::class.java.name))
             adapter = NfcAdapter.getDefaultAdapter(this)
@@ -196,7 +206,7 @@ class MainActivity : AppCompatActivity(), NavigationView.OnNavigationItemSelecte
                 this, 0,
                 Intent(this, javaClass).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0
             )
-
+        }
     }
 
 }

fastlane/metadata/android/en-US/chnagelogs/14.txt

@@ -1,5 +1,7 @@
 This release 0.5.0 is called  "artistical Apollon".
 
 * new: it's now possible to choos a theme (light, dark or balck)
-* change: updated some libs, updated kotlin to 1.3.40
+* new: you can now check your current mensa card balance
+* change: updated some libs, updated kotlin to 1.3.41
 * fix: the mensa should now show the correct meals on sunday/monday
+* fix: the timetable should now show the correct on the sunday/monday change