diff --git a/app/build.gradle b/app/build.gradle
index 1a0d49b..1b2233c 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -3,12 +3,12 @@ plugins {
 }
 
 android {
-    compileSdkVersion 29
+    compileSdkVersion 30
 
     defaultConfig {
         applicationId "de.jg_cody.Teraplex"
-        minSdkVersion 16
-        targetSdkVersion 29
+        minSdkVersion 19
+        targetSdkVersion 30
         versionCode 1
         versionName "1.0"
         multiDexEnabled true
diff --git a/app/src/main/java/de/jg_cody/Teraplex/MainActivity.java b/app/src/main/java/de/jg_cody/Teraplex/MainActivity.java
index 9c08184..2b84916 100644
--- a/app/src/main/java/de/jg_cody/Teraplex/MainActivity.java
+++ b/app/src/main/java/de/jg_cody/Teraplex/MainActivity.java
@@ -24,6 +24,7 @@ import android.os.Vibrator;
 import android.provider.MediaStore;
 import android.text.SpannableString;
 import android.text.style.ForegroundColorSpan;
+import android.util.Base64;
 import android.util.TypedValue;
 import android.view.LayoutInflater;
 import android.view.Menu;
@@ -57,7 +58,6 @@ import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.util.ArrayList;
-import java.util.Base64;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Locale;
@@ -85,14 +85,15 @@ public class MainActivity extends AppCompatActivity {
 
     Map<String, MenuItem> tabitems = new HashMap<>();
 
-    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         getWindow().addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
         getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
-        getWindow().setStatusBarColor(Color.TRANSPARENT);
-        getWindow().setNavigationBarColor(Color.BLUE);
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
+            getWindow().setStatusBarColor(Color.TRANSPARENT);
+            getWindow().setNavigationBarColor(Color.BLUE);
+        }
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
             getWindow().setStatusBarContrastEnforced(false);
         }
@@ -477,7 +478,6 @@ public class MainActivity extends AppCompatActivity {
     }
 
 
-    @RequiresApi(api = Build.VERSION_CODES.O)
     @Override
     protected void onActivityResult(int requestCode, int resultCode, Intent data) {
         super.onActivityResult(requestCode, resultCode, data);
@@ -505,7 +505,7 @@ public class MainActivity extends AppCompatActivity {
                 }
                 Background.close();
                 SharedPreferences p = getSharedPreferences("appsettings", Context.MODE_PRIVATE);
-                p.edit().putString("Background", Base64.getEncoder().encodeToString(bOut.toByteArray())).apply();
+                p.edit().putString("Background", Base64.encodeToString(bOut.toByteArray(), Base64.DEFAULT)).apply();
                 loadBackground();
                 startActivity(getIntent());
                 finish();
@@ -517,12 +517,11 @@ public class MainActivity extends AppCompatActivity {
 
     }
 
-    @RequiresApi(api = Build.VERSION_CODES.O)
     private void loadBackground() {
         SharedPreferences p = getSharedPreferences("appsettings", Activity.MODE_PRIVATE);
         String Background = p.getString("Background", null);
         ImageView I = findViewById(R.id.Background);
-        byte[] BA = Base64.getDecoder().decode(Background);
+        byte[] BA = Base64.decode(Background, Base64.DEFAULT);
         I.setImageBitmap(BitmapFactory.decodeByteArray(BA, 0, BA.length));
 
     }
diff --git a/app/src/main/java/de/jg_cody/Teraplex/ui/Credits/CreditsFragment.java b/app/src/main/java/de/jg_cody/Teraplex/ui/Credits/CreditsFragment.java
index ab2e013..3ee19ea 100644
--- a/app/src/main/java/de/jg_cody/Teraplex/ui/Credits/CreditsFragment.java
+++ b/app/src/main/java/de/jg_cody/Teraplex/ui/Credits/CreditsFragment.java
@@ -6,6 +6,7 @@ import android.graphics.BitmapFactory;
 import android.graphics.drawable.BitmapDrawable;
 import android.os.Build;
 import android.os.Bundle;
+import android.util.Base64;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -16,8 +17,6 @@ import androidx.annotation.RequiresApi;
 import androidx.fragment.app.Fragment;
 import androidx.lifecycle.ViewModelProvider;
 
-import java.util.Base64;
-
 import de.jg_cody.Teraplex.MainActivity;
 import de.jg_cody.Teraplex.R;
 
@@ -25,7 +24,6 @@ public class CreditsFragment extends Fragment {
 
     private CreditsViewModel creditsViewModel;
 
-    @RequiresApi(api = Build.VERSION_CODES.O)
     public View onCreateView(@NonNull LayoutInflater inflater,
                              ViewGroup container, Bundle savedInstanceState) {
         creditsViewModel =
@@ -35,7 +33,7 @@ public class CreditsFragment extends Fragment {
         String Background = p.getString("Background", null);
         if (Background != null) {
             ImageView I = root.findViewById(R.id.Background);
-            byte[] BA = Base64.getDecoder().decode(Background);
+            byte[] BA = Base64.decode(Background, Base64.DEFAULT);
             I.setImageDrawable(new BitmapDrawable(getResources(), MainActivity.scaleCenterCrop(BitmapFactory.decodeByteArray(BA, 0, BA.length), MainActivity.getScreenHeight(), MainActivity.getScreenWidth())));
             I.setScaleType(ImageView.ScaleType.CENTER_CROP);
         }
diff --git a/app/src/main/java/de/jg_cody/Teraplex/ui/Einstellungen/EinstellungenFragment.java b/app/src/main/java/de/jg_cody/Teraplex/ui/Einstellungen/EinstellungenFragment.java
index 4284e37..9fe3324 100644
--- a/app/src/main/java/de/jg_cody/Teraplex/ui/Einstellungen/EinstellungenFragment.java
+++ b/app/src/main/java/de/jg_cody/Teraplex/ui/Einstellungen/EinstellungenFragment.java
@@ -13,6 +13,7 @@ import android.media.MediaPlayer;
 import android.os.Build;
 import android.os.Bundle;
 import android.os.Vibrator;
+import android.util.Base64;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -24,7 +25,6 @@ import androidx.annotation.RequiresApi;
 import androidx.fragment.app.Fragment;
 import androidx.lifecycle.ViewModelProvider;
 
-import java.util.Base64;
 import java.util.Locale;
 import java.util.Objects;
 
@@ -37,7 +37,6 @@ public class EinstellungenFragment extends Fragment {
 
     private EinstellungenViewModel einstellungenViewModel;
 
-    @RequiresApi(api = Build.VERSION_CODES.O)
     public View onCreateView(@NonNull LayoutInflater inflater,
                              ViewGroup container, Bundle savedInstanceState) {
         einstellungenViewModel =
@@ -47,7 +46,7 @@ public class EinstellungenFragment extends Fragment {
         String Background = p.getString("Background", null);
         if (Background != null) {
             ImageView I = root.findViewById(R.id.Background);
-            byte[] BA = Base64.getDecoder().decode(Background);
+            byte[] BA = Base64.decode(Background, Base64.DEFAULT);
             I.setImageDrawable(new BitmapDrawable(getResources(), MainActivity.scaleCenterCrop(BitmapFactory.decodeByteArray(BA, 0, BA.length), MainActivity.getScreenHeight(), MainActivity.getScreenWidth())));
             I.setScaleType(ImageView.ScaleType.CENTER_CROP);
         }
diff --git a/app/src/main/java/de/jg_cody/Teraplex/ui/Konsole/KonsoleFragment.java b/app/src/main/java/de/jg_cody/Teraplex/ui/Konsole/KonsoleFragment.java
index 9d59037..5e2fd4f 100644
--- a/app/src/main/java/de/jg_cody/Teraplex/ui/Konsole/KonsoleFragment.java
+++ b/app/src/main/java/de/jg_cody/Teraplex/ui/Konsole/KonsoleFragment.java
@@ -11,6 +11,7 @@ import android.media.MediaPlayer;
 import android.os.Build;
 import android.os.Bundle;
 import android.os.Vibrator;
+import android.util.Base64;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -24,7 +25,6 @@ import androidx.annotation.RequiresApi;
 import androidx.fragment.app.Fragment;
 import androidx.lifecycle.ViewModelProvider;
 
-import java.util.Base64;
 import java.util.Objects;
 
 import de.jg_cody.Teraplex.MainActivity;
@@ -46,7 +46,6 @@ public class KonsoleFragment extends Fragment {
 
     private KonsoleViewModel konsoleViewModel;
 
-    @RequiresApi(api = Build.VERSION_CODES.O)
     public View onCreateView(@NonNull LayoutInflater inflater,
                              ViewGroup container, Bundle savedInstanceState) {
         konsoleViewModel =
@@ -56,7 +55,7 @@ public class KonsoleFragment extends Fragment {
         String Background = p.getString("Background", null);
         if (Background != null) {
             ImageView I = root.findViewById(R.id.Background);
-            byte[] BA = Base64.getDecoder().decode(Background);
+            byte[] BA = Base64.decode(Background, Base64.DEFAULT);
             I.setImageDrawable(new BitmapDrawable(getResources(), MainActivity.scaleCenterCrop(BitmapFactory.decodeByteArray(BA, 0, BA.length), MainActivity.getScreenHeight(), MainActivity.getScreenWidth())));
             I.setScaleType(ImageView.ScaleType.CENTER_CROP);
         }
diff --git a/app/src/main/java/de/jg_cody/Teraplex/ui/Tabs/TabsFragment.java b/app/src/main/java/de/jg_cody/Teraplex/ui/Tabs/TabsFragment.java
index cd6a5da..b434029 100644
--- a/app/src/main/java/de/jg_cody/Teraplex/ui/Tabs/TabsFragment.java
+++ b/app/src/main/java/de/jg_cody/Teraplex/ui/Tabs/TabsFragment.java
@@ -8,6 +8,7 @@ import android.graphics.BitmapFactory;
 import android.graphics.drawable.BitmapDrawable;
 import android.os.Build;
 import android.os.Bundle;
+import android.util.Base64;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -29,7 +30,6 @@ import org.json.JSONException;
 import org.json.JSONObject;
 
 import java.util.ArrayList;
-import java.util.Base64;
 import java.util.Objects;
 
 import de.jg_cody.Teraplex.AddButtonDialogSingle;
@@ -69,7 +69,6 @@ public class TabsFragment extends Fragment implements AddButtonDialogSingle.AddB
         this.tabname = tabname;
     }
 
-    @RequiresApi(api = Build.VERSION_CODES.O)
     public View onCreateView(@NonNull LayoutInflater inflater,
                              ViewGroup container, Bundle savedInstanceState) {
         tabsViewModel =
@@ -79,7 +78,7 @@ public class TabsFragment extends Fragment implements AddButtonDialogSingle.AddB
         String Background = p.getString("Background", null);
         if (Background != null) {
             ImageView I = root.findViewById(R.id.Background);
-            byte[] BA = Base64.getDecoder().decode(Background);
+            byte[] BA = Base64.decode(Background, Base64.DEFAULT);
             I.setImageDrawable(new BitmapDrawable(getResources(), MainActivity.scaleCenterCrop(BitmapFactory.decodeByteArray(BA, 0, BA.length), MainActivity.getScreenHeight(), MainActivity.getScreenWidth())));
             I.setScaleType(ImageView.ScaleType.CENTER_CROP);
         }
@@ -264,7 +263,6 @@ public class TabsFragment extends Fragment implements AddButtonDialogSingle.AddB
         ;
     }
 
-    @RequiresApi(api = Build.VERSION_CODES.KITKAT)
     public void save() throws JSONException {
         JSONArray listItems2 = new JSONArray();
         for (ListItem Item : listAdapter.getObjects()) {
diff --git a/app/src/main/java/de/jg_cody/Teraplex/ui/home/HomeFragment.java b/app/src/main/java/de/jg_cody/Teraplex/ui/home/HomeFragment.java
index b4fee2f..7bdeb5d 100644
--- a/app/src/main/java/de/jg_cody/Teraplex/ui/home/HomeFragment.java
+++ b/app/src/main/java/de/jg_cody/Teraplex/ui/home/HomeFragment.java
@@ -10,6 +10,7 @@ import android.media.MediaPlayer;
 import android.os.Build;
 import android.os.Bundle;
 import android.os.Vibrator;
+import android.util.Base64;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -24,7 +25,6 @@ import androidx.annotation.RequiresApi;
 import androidx.fragment.app.Fragment;
 import androidx.lifecycle.ViewModelProvider;
 
-import java.util.Base64;
 import java.util.Objects;
 
 import de.jg_cody.Teraplex.MainActivity;
@@ -48,7 +48,6 @@ public class HomeFragment extends Fragment {
 
     private HomeViewModel homeViewModel;
 
-    @RequiresApi(api = Build.VERSION_CODES.O)
     public View onCreateView(@NonNull LayoutInflater inflater,
                              ViewGroup container, Bundle savedInstanceState) {
         SharedPreferences prefs = requireContext().getSharedPreferences("appsettings", Context.MODE_PRIVATE);
@@ -63,7 +62,7 @@ public class HomeFragment extends Fragment {
         String Background = p.getString("Background", null);
         if (Background != null) {
             ImageView I = root.findViewById(R.id.Background);
-            byte[] BA = Base64.getDecoder().decode(Background);
+            byte[] BA = Base64.decode(Background, Base64.DEFAULT);
             I.setImageDrawable(new BitmapDrawable(getResources(), MainActivity.scaleCenterCrop(BitmapFactory.decodeByteArray(BA, 0, BA.length), MainActivity.getScreenHeight(), MainActivity.getScreenWidth())));
             I.setScaleType(ImageView.ScaleType.CENTER_CROP);
         }
diff --git a/app/src/main/java/de/jg_cody/Teraplex/ui/rooms/ListItem.java b/app/src/main/java/de/jg_cody/Teraplex/ui/rooms/ListItem.java
index a8e9ff8..d0afea6 100644
--- a/app/src/main/java/de/jg_cody/Teraplex/ui/rooms/ListItem.java
+++ b/app/src/main/java/de/jg_cody/Teraplex/ui/rooms/ListItem.java
@@ -15,11 +15,14 @@ public abstract class ListItem {
         this.type = type;
     }
 
-    @RequiresApi(api = Build.VERSION_CODES.KITKAT)
     public JSONObject toJson() throws JSONException {
         JSONObject toJson = new JSONObject();
         toJson.put("type", type);
-        toJson.put("strings", new JSONArray(getStrings()));
+        JSONArray a = new JSONArray();
+        for(String s : getStrings()) {
+            a.put(s);
+        }
+        toJson.put("strings", a);
         return toJson;
     }
 
diff --git a/app/src/main/java/de/jg_cody/Teraplex/ui/zeitsteuerung/ZeitsteuerungFragment.java b/app/src/main/java/de/jg_cody/Teraplex/ui/zeitsteuerung/ZeitsteuerungFragment.java
index b3a23f4..3151a0d 100644
--- a/app/src/main/java/de/jg_cody/Teraplex/ui/zeitsteuerung/ZeitsteuerungFragment.java
+++ b/app/src/main/java/de/jg_cody/Teraplex/ui/zeitsteuerung/ZeitsteuerungFragment.java
@@ -6,6 +6,7 @@ import android.graphics.BitmapFactory;
 import android.graphics.drawable.BitmapDrawable;
 import android.os.Build;
 import android.os.Bundle;
+import android.util.Base64;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -17,7 +18,6 @@ import androidx.annotation.RequiresApi;
 import androidx.fragment.app.Fragment;
 import androidx.lifecycle.ViewModelProvider;
 
-import java.util.Base64;
 import java.util.Objects;
 
 import de.jg_cody.Teraplex.MainActivity;
@@ -28,7 +28,6 @@ public class ZeitsteuerungFragment extends Fragment {
     private ZeitsteuerungViewModel zeitsteuerungViewModel;
     TimePicker timePicker;
 
-    @RequiresApi(api = Build.VERSION_CODES.O)
     public View onCreateView(@NonNull LayoutInflater inflater,
                              ViewGroup container, Bundle savedInstanceState) {
         zeitsteuerungViewModel =
@@ -38,7 +37,7 @@ public class ZeitsteuerungFragment extends Fragment {
         String Background = p.getString("Background", null);
         if (Background != null) {
             ImageView I = root.findViewById(R.id.Background);
-            byte[] BA = Base64.getDecoder().decode(Background);
+            byte[] BA = Base64.decode(Background, Base64.DEFAULT);
             I.setImageDrawable(new BitmapDrawable(getResources(), MainActivity.scaleCenterCrop(BitmapFactory.decodeByteArray(BA, 0, BA.length), MainActivity.getScreenHeight(), MainActivity.getScreenWidth())));
             I.setScaleType(ImageView.ScaleType.CENTER_CROP);
         }
diff --git a/app/src/main/res/values-night/colors.xml b/app/src/main/res/values-night/colors.xml
new file mode 100644
index 0000000..960aeba
--- /dev/null
+++ b/app/src/main/res/values-night/colors.xml
@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="purple_200">#EE0000</color>
+    <color name="purple_500">#EE0000</color>
+    <color name="red_dark">#B30000</color>
+    <color name="red">#DA0303</color>
+    <color name="blue">#FF0088FF</color>
+    <color name="yellow">#FFE500</color>
+    <color name="turquoise">#00FFF7</color>
+    <color name="orange">#FF7700</color>
+    <color name="pink">#D900FF</color>
+    <color name="green">#00FF0A</color>
+    <color name="teal_700">#870101</color>
+    <color name="colorOnBackgroundNight">#000000</color>
+    <color name="colorOnBackgroundDay">#FFFFFF</color>
+
+    <color name="black">#000000</color>
+    <color name="white">#FFFFFF</color>
+
+    <color name="green_200">#00EE00</color>
+    <color name="green_500">#00EE00</color>
+    <color name="green_700">#00B300</color>
+    <color name="green_100">#03DA03</color>
+    <color name="green_600">#018701</color>
+</resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml
index f745424..960aeba 100644
--- a/app/src/main/res/values/colors.xml
+++ b/app/src/main/res/values/colors.xml
@@ -22,5 +22,4 @@
     <color name="green_700">#00B300</color>
     <color name="green_100">#03DA03</color>
     <color name="green_600">#018701</color>
-
 </resources>
\ No newline at end of file
diff --git a/build.gradle b/build.gradle
index 2dcabb6..407a26d 100644
--- a/build.gradle
+++ b/build.gradle
@@ -6,7 +6,7 @@ buildscript {
         maven { url 'https://maven.google.com/' }
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.2.1'
+        classpath 'com.android.tools.build:gradle:4.2.2'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files