diff --git a/app/build.gradle b/app/build.gradle
index 1b1b749..959a6a3 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -30,11 +30,11 @@ android {
 
 dependencies {
 
-    implementation 'androidx.appcompat:appcompat:1.1.0'
-    implementation 'com.google.android.material:material:1.1.0'
-    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
-    testImplementation 'junit:junit:4.+'
-    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
-    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
-    implementation 'com.android.support:design:28.0.0'
+    implementation 'androidx.appcompat:appcompat:1.2.0'
+    implementation 'com.google.android.material:material:1.3.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
+    testImplementation 'junit:junit:4.13.2'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.2'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
+    implementation 'com.google.android.material:material:1.3.0'
 }
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 8acc3b5..53859b8 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,6 +1,10 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="de.joel.zoomhelper">
+    <queries>
+        <package android:name="us.zoom.videomeetings" />
+    </queries>
+
 
     <application
         android:allowBackup="true"
diff --git a/app/src/main/java/de/joel/zoomhelper/MainActivity.java b/app/src/main/java/de/joel/zoomhelper/MainActivity.java
index cc4a1ab..76c64c4 100644
--- a/app/src/main/java/de/joel/zoomhelper/MainActivity.java
+++ b/app/src/main/java/de/joel/zoomhelper/MainActivity.java
@@ -1,28 +1,23 @@
 package de.joel.zoomhelper;
 
-import androidx.appcompat.app.AlertDialog;
-import androidx.appcompat.app.AppCompatActivity;
-
 import android.annotation.SuppressLint;
 import android.content.Context;
-import android.content.DialogInterface;
 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.net.Uri;
 import android.os.Bundle;
 import android.util.AttributeSet;
 import android.util.Base64;
-import android.view.MotionEvent;
 import android.view.View;
-import android.view.animation.Animation;
-import android.view.animation.AnimationUtils;
 import android.widget.ArrayAdapter;
 import android.widget.AutoCompleteTextView;
 import android.widget.EditText;
 import android.widget.ImageView;
-import android.widget.ListPopupWindow;
 import android.widget.Toast;
 
+import androidx.appcompat.app.AlertDialog;
+import androidx.appcompat.app.AppCompatActivity;
+
 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
 import java.io.EOFException;
@@ -33,7 +28,7 @@ import java.io.Serializable;
 import java.util.ArrayList;
 import java.util.Objects;
 
-class InstantAutoComplete extends AutoCompleteTextView {
+class InstantAutoComplete extends androidx.appcompat.widget.AppCompatAutoCompleteTextView {
 
     public InstantAutoComplete(Context context) {
         super(context);
@@ -66,8 +61,8 @@ public class MainActivity extends AppCompatActivity {
             }
             catch (IndexOutOfBoundsException e) {
                AlertDialog.Builder dialog=new AlertDialog.Builder(this);
-                dialog.setMessage("Daten wurden zurückgesetzt, da die Config-Struktur nochmal verändert wurde.");
-                dialog.setTitle("Hinweis");
+                dialog.setMessage(R.string.resetDataText);
+                dialog.setTitle(R.string.hint);
                 AlertDialog alertDialog=dialog.create();
                 alertDialog.show();
                 setLastMeeting(-1);
@@ -83,9 +78,7 @@ public class MainActivity extends AppCompatActivity {
 
     private void watchShareIcon() {
         ImageView ShareIcon = findViewById(R.id.imageShare);
-        ShareIcon.setOnClickListener(v -> {
-            shareMeeting(createCurrMeetingFromUI());
-        });
+        ShareIcon.setOnClickListener(v -> shareMeeting(createCurrMeetingFromUI()));
     }
 
     private void shareMeeting(Meeting meeting) {
@@ -100,23 +93,17 @@ public class MainActivity extends AppCompatActivity {
 
     private void watchNewIcon() {
         ImageView AddIcon = findViewById(R.id.imageAdd);
-        AddIcon.setOnClickListener(v -> {
-            fillBlank();
-        });
+        AddIcon.setOnClickListener(v -> fillBlank());
     }
 
     private void watchAttIcon() {
         ImageView AttIcon = findViewById(R.id.imageAttend);
-        AttIcon.setOnClickListener(v -> {
-            btnJoin_onClick(null);
-        });
+        AttIcon.setOnClickListener(v -> btnJoin_onClick(null));
     }
 
     private void watchDeleteIcon() {
         ImageView trashIcon = findViewById(R.id.imageTrash);
-        trashIcon.setOnClickListener(v -> {
-            removeMeeting(getLastMeeting());
-        });
+        trashIcon.setOnClickListener(v -> removeMeeting(getLastMeeting()));
     }
 
     private void removeMeeting(int meeting) {
@@ -160,9 +147,7 @@ public class MainActivity extends AppCompatActivity {
 
     private void watchSaveIcon() {
         ImageView saveIcon = findViewById(R.id.imageSave);
-        saveIcon.setOnClickListener(v -> {
-            saveAllMeetings();
-        });
+        saveIcon.setOnClickListener(v -> saveAllMeetings());
     }
 
     public void watchMeetingNameBox() {
@@ -194,7 +179,7 @@ public class MainActivity extends AppCompatActivity {
 
         AutoCompleteTextView textMeetingName = findViewById(R.id.TextMeetingName);
         ImageView dropdown = findViewById(R.id.image);
-        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_dropdown_item_1line, meetingNames);
+        ArrayAdapter<String> adapter = new ArrayAdapter<>(this, android.R.layout.simple_dropdown_item_1line, meetingNames);
         textMeetingName.setAdapter(adapter);
 
         textMeetingName.setOnTouchListener((View.OnTouchListener) (paramView, paramMotionEvent) -> {
@@ -203,9 +188,7 @@ public class MainActivity extends AppCompatActivity {
             return false;
         });
 
-        textMeetingName.setOnItemClickListener((arg0, view, arg2, arg3) -> {
-            fillWithSelectedMeeting();
-        });
+        textMeetingName.setOnItemClickListener((arg0, view, arg2, arg3) -> fillWithSelectedMeeting());
 
         dropdown.setOnClickListener(v -> {
             textMeetingName.showDropDown();
@@ -217,19 +200,17 @@ public class MainActivity extends AppCompatActivity {
         Meeting meeting = getMeetings().get(meetingIndex);
         ArrayList<Attendee> attendees = meeting.attendees;
 
-        String attNames[] = new String[attendees.size()];
+        String[] attNames = new String[attendees.size()];
         for (int i = 0; i < attendees.size(); i++) {
             attNames[i] = attendees.get(i).name;
         }
 
         AutoCompleteTextView textName = findViewById(R.id.textBoxName);
         ImageView dropdown = findViewById(R.id.image2);
-        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_dropdown_item_1line, attNames);
+        ArrayAdapter<String> adapter = new ArrayAdapter<>(this, android.R.layout.simple_dropdown_item_1line, attNames);
         textName.setAdapter(adapter);
 
-        textName.setOnItemClickListener((arg0, view, arg2, arg3) -> {
-            fillWithSelectedAtt();
-        });
+        textName.setOnItemClickListener((arg0, view, arg2, arg3) -> fillWithSelectedAtt());
 
         dropdown.setOnClickListener(v -> {
             textName.showDropDown();
@@ -291,6 +272,7 @@ public class MainActivity extends AppCompatActivity {
         for (Object obj : listMeetings) {
 
             try {
+                if (objOutputStream == null) throw new AssertionError();
                 objOutputStream.writeObject(obj);
             } catch (IOException e) {
                 e.printStackTrace();
@@ -302,6 +284,7 @@ public class MainActivity extends AppCompatActivity {
             }
         }
         try {
+            if (objOutputStream == null) throw new AssertionError();
             objOutputStream.close();
         } catch (IOException e) {
             e.printStackTrace();
@@ -313,7 +296,7 @@ public class MainActivity extends AppCompatActivity {
     public ArrayList<Meeting> stringToMeetings(String string) {
         byte[] bytes = Base64.decode(string, 0);
 
-        ArrayList<Meeting> listMeetings = new ArrayList();
+        ArrayList<Meeting> listMeetings = new ArrayList<>();
         ByteArrayInputStream bis = new ByteArrayInputStream(bytes);
         ObjectInputStream obj = null;
         try {
@@ -324,19 +307,19 @@ public class MainActivity extends AppCompatActivity {
         try {
             while (bis.available() != -1) {
                 //Read object from file
+                if (obj == null) throw new AssertionError();
                 Meeting meeting = (Meeting) obj.readObject();
                 listMeetings.add(meeting);
             }
         } catch (EOFException ex) {
             //ex.printStackTrace();
-        } catch (IOException e) {
-            e.printStackTrace();
-        } catch (ClassNotFoundException e) {
+        } catch (IOException | ClassNotFoundException e) {
             e.printStackTrace();
         }
         return listMeetings;
     }
 
+    @SuppressLint("ApplySharedPref")
     public void saveMeetingList(ArrayList<Meeting> meetingList) {
         SharedPreferences mPrefs = getPreferences(MODE_PRIVATE);
         SharedPreferences.Editor prefsEditor = mPrefs.edit();
@@ -344,6 +327,7 @@ public class MainActivity extends AppCompatActivity {
         prefsEditor.commit();
     }
 
+    @SuppressLint("ApplySharedPref")
     public void setLastMeeting(int id) {
         SharedPreferences mPrefs = getPreferences(MODE_PRIVATE);
         SharedPreferences.Editor prefsEditor = mPrefs.edit();
@@ -399,8 +383,7 @@ public class MainActivity extends AppCompatActivity {
         EditText editName = findViewById(R.id.textBoxName);
         EditText editAtt = findViewById(R.id.editAtt);
 
-        Meeting currMeeting = new Meeting(editMeetingName.getText().toString(), editID.getText().toString(), editPW.getText().toString(), editName.getText().toString(), editAtt.getText().toString());
-        return currMeeting;
+        return new Meeting(editMeetingName.getText().toString(), editID.getText().toString(), editPW.getText().toString(), editName.getText().toString(), editAtt.getText().toString());
     }
 
     public void saveAllMeetings() {
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index d89fa52..4c94e2c 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -12,5 +12,7 @@
     <string name="MeetingID">Meeting-ID:</string>
     <string name="Password">Kenncode:</string>
     <string name="MeetingName">Meeting Name:</string>
+    <string name="resetDataText">Daten wurden zurückgesetzt, da die Config-Struktur nochmal verändert wurde.</string>
+    <string name="hint">Hinweis</string>
 
 </resources>
\ No newline at end of file