diff --git a/APED/app/src/main/java/com/example/aped/MainActivity.java b/APED/app/src/main/java/com/example/aped/MainActivity.java
index 9a48de5..02b67ef 100644
--- a/APED/app/src/main/java/com/example/aped/MainActivity.java
+++ b/APED/app/src/main/java/com/example/aped/MainActivity.java
@@ -6,6 +6,7 @@ import android.view.MenuItem;
 import android.view.Menu;
 import android.widget.Toast;
 
+import com.example.aped.communication.IIO;
 import com.example.aped.communication.IXML;
 import com.example.aped.communication.TestXML;
 import com.google.android.material.navigation.NavigationView;
@@ -24,6 +25,8 @@ public class MainActivity extends AppCompatActivity {
     private AppBarConfiguration mAppBarConfiguration;
     /** zur Verwendung von xml anstatt der direkten Einbindung.*/
     private IXML xml;
+    /** zur Verwendung von uebergabe anstatt der direkten Einbindung.*/
+    private IIO uebergabe;
     /** allgemeines.*/
     @Override
     protected void onCreate(final Bundle savedInstanceState) {
@@ -75,13 +78,16 @@ public class MainActivity extends AppCompatActivity {
                         Toast.LENGTH_SHORT).show();
                 return true;
             case R.id.action_download_xml:
+                if (xml.download() == 0) {
                 Toast.makeText(this, "Download .xml",
                         Toast.LENGTH_SHORT).show();
+            }
                 return true;
             case R.id.action_upload_xml:
+                if (xml.upload() == 0) {
                 Toast.makeText(this, "Upload .xml",
                         Toast.LENGTH_SHORT).show();
-                xml.upload();
+            }
                 return true;
             default:
                 return super.onOptionsItemSelected(item);
diff --git a/APED/app/src/main/java/com/example/aped/communication/IIO.java b/APED/app/src/main/java/com/example/aped/communication/IIO.java
new file mode 100644
index 0000000..c327685
--- /dev/null
+++ b/APED/app/src/main/java/com/example/aped/communication/IIO.java
@@ -0,0 +1,16 @@
+package com.example.aped.communication;
+
+public interface IIO {
+    /**
+     *
+     * @return Einlesewerte in Array
+     */
+    String[][] rueckgabeAI();
+
+    /**
+     *
+     * @return Einlesewerte in Array
+     */
+    String rueckgabeDI();
+    //DO (int);
+}
diff --git a/APED/app/src/main/java/com/example/aped/communication/IXML.java b/APED/app/src/main/java/com/example/aped/communication/IXML.java
index 69f1cfc..880941a 100644
--- a/APED/app/src/main/java/com/example/aped/communication/IXML.java
+++ b/APED/app/src/main/java/com/example/aped/communication/IXML.java
@@ -1,9 +1,16 @@
 package com.example.aped.communication;
 
 public interface IXML {
-    /** dowload er XML.*/
+    /**
+     *
+     * @return hat Funktioniert?
+     */
     int download();
-    /** upload er XML.*/
+
+    /**
+     *
+     * @return hat Funktioniert?
+     */
     int upload();
 
 }
diff --git a/APED/app/src/main/java/com/example/aped/communication/TestIO.java b/APED/app/src/main/java/com/example/aped/communication/TestIO.java
new file mode 100644
index 0000000..7ee8a66
--- /dev/null
+++ b/APED/app/src/main/java/com/example/aped/communication/TestIO.java
@@ -0,0 +1,28 @@
+package com.example.aped.communication;
+
+public class TestIO implements IIO {
+    /** Test Klasse.*/
+    @Override
+    public String[][] rueckgabeAI() {
+        //String AI[3][3];
+       /** AI[0][0]="Test";
+        AI[1][1]="5.658";
+        AI[1][2]="Volt";
+
+        AI[1][0]="Test2";
+        AI[1][1]="10";
+        AI[1][2]="Ohm";
+
+        AI[2][0]="Test3";
+        AI[2][1]="9.88";
+        AI[2][2]="Ampere";
+
+        AI[3][0]="END";*/
+        return AI;
+    }
+    /** Test Klasse.*/
+    @Override
+    public String rueckgabeDI() {
+        return null;
+    }
+}
diff --git a/APED/app/src/main/java/com/example/aped/communication/TestXML.java b/APED/app/src/main/java/com/example/aped/communication/TestXML.java
index 79c3f58..0b43443 100644
--- a/APED/app/src/main/java/com/example/aped/communication/TestXML.java
+++ b/APED/app/src/main/java/com/example/aped/communication/TestXML.java
@@ -1,12 +1,13 @@
 package com.example.aped.communication;
 
+
 public class TestXML implements IXML {
-    /** was soll bei download getan werden.*/
+    /** Test Klasse.*/
     @Override
     public int download() {
         return 0;
     }
-    /** was soll bei upload getan werden.*/
+    /** Test Klasse.*/
     @Override
     public int upload() {
         return 0;
diff --git a/APED/app/src/main/java/com/example/aped/ui/all_IOs/AllIOsFragment.java b/APED/app/src/main/java/com/example/aped/ui/all_IOs/AllIOsFragment.java
index 51d9a7e..df0d314 100644
--- a/APED/app/src/main/java/com/example/aped/ui/all_IOs/AllIOsFragment.java
+++ b/APED/app/src/main/java/com/example/aped/ui/all_IOs/AllIOsFragment.java
@@ -17,6 +17,14 @@ import com.example.aped.R;
 public class AllIOsFragment extends Fragment {
     /**Azeige Modell.*/
     private AllIOsViewModel allIOsViewModel;
+
+    /**
+     *
+     * @param inflater
+     * @param container
+     * @param savedInstanceState
+     * @return root
+     */
     public View onCreateView(final @NonNull LayoutInflater inflater,
                              final ViewGroup container,
                              final Bundle savedInstanceState) {
diff --git a/APED/app/src/main/java/com/example/aped/ui/all_IOs/AllIOsViewModel.java b/APED/app/src/main/java/com/example/aped/ui/all_IOs/AllIOsViewModel.java
index 1606146..5d87734 100644
--- a/APED/app/src/main/java/com/example/aped/ui/all_IOs/AllIOsViewModel.java
+++ b/APED/app/src/main/java/com/example/aped/ui/all_IOs/AllIOsViewModel.java
@@ -13,7 +13,11 @@ public class AllIOsViewModel extends ViewModel {
         mText.setValue("Anzeige aller Mess & Sollwertvorgaben bestimmt durch"
                         + " die xml");
     }
-    /** Rückgabe des Textes.*/
+
+    /**
+     *
+     * @return mText
+     */
     public LiveData<String> getText() {
         return mText;
     }
diff --git a/APED/app/src/main/java/com/example/aped/ui/your_IOs/YourIOsFragment.java b/APED/app/src/main/java/com/example/aped/ui/your_IOs/YourIOsFragment.java
index 21c80d5..b0244c6 100644
--- a/APED/app/src/main/java/com/example/aped/ui/your_IOs/YourIOsFragment.java
+++ b/APED/app/src/main/java/com/example/aped/ui/your_IOs/YourIOsFragment.java
@@ -17,7 +17,15 @@ import com.example.aped.R;
 public class YourIOsFragment extends Fragment {
     /**Azeige Modell.*/
     private YourIOsViewModel yourIOsViewModel;
-        public View onCreateView(final @NonNull LayoutInflater inflater,
+
+    /**
+     *
+     * @param inflater
+     * @param container
+     * @param savedInstanceState
+     * @return root
+     */
+    public View onCreateView(final @NonNull LayoutInflater inflater,
                              final ViewGroup container,
                                  final Bundle savedInstanceState) {
         yourIOsViewModel =
diff --git a/APED/app/src/main/java/com/example/aped/ui/your_IOs/YourIOsViewModel.java b/APED/app/src/main/java/com/example/aped/ui/your_IOs/YourIOsViewModel.java
index 55a8d7f..50990f4 100644
--- a/APED/app/src/main/java/com/example/aped/ui/your_IOs/YourIOsViewModel.java
+++ b/APED/app/src/main/java/com/example/aped/ui/your_IOs/YourIOsViewModel.java
@@ -12,7 +12,11 @@ public class YourIOsViewModel extends ViewModel {
         mText = new MutableLiveData<>();
         mText.setValue("Personalisierte Anzeige der Mess- & Sollwerte");
     }
-    /** Rückgabe des Textes.*/
+
+    /**
+     *
+     * @return test Rückgabe
+     */
     public final LiveData<String> getText() {
         return mText;
     }
diff --git a/APED/app/src/main/res/values/colors.xml b/APED/app/src/main/res/values/colors.xml
index 51228c8..761962a 100644
--- a/APED/app/src/main/res/values/colors.xml
+++ b/APED/app/src/main/res/values/colors.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
     <color name="purple_200">#FFBB86FC</color>
-    <color name="red">#ff0006</color>
+    <color name="red">#f01313</color>
     <color name="grey">#5a5458</color>
     <color name="teal_200">#FF03DAC5</color>
     <color name="teal_700">#FF018786</color>