add FileChooser

# Conflicts:
#	app/src/main/java/de/joel/zoomhelper/MainActivity.java

.idea/compiler.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="CompilerConfiguration">
-    <bytecodeTargetLevel target="1.8" />
+    <bytecodeTargetLevel target="11" />
   </component>
 </project>

.idea/dictionaries/Joel.xml

@@ -0,0 +1,8 @@
+<component name="ProjectDictionaryState">
+  <dictionary name="Joel">
+    <words>
+      <w>videomeetings</w>
+      <w>zoomhelper</w>
+    </words>
+  </dictionary>
+</component>

.idea/gradle.xml

@@ -4,11 +4,11 @@
   <component name="GradleSettings">
     <option name="linkedExternalProjectsSettings">
       <GradleProjectSettings>
+        <option name="delegatedBuild" value="true" />
         <option name="testRunner" value="PLATFORM" />
-        <option name="disableWrapperSourceDistributionNotification" value="true" />
         <option name="distributionType" value="DEFAULT_WRAPPED" />
         <option name="externalProjectPath" value="$PROJECT_DIR$" />
-        <option name="gradleJvm" value="11" />
+        <option name="gradleJvm" value="14" />
         <option name="modules">
           <set>
             <option value="$PROJECT_DIR$" />
@@ -16,7 +16,6 @@
           </set>
         </option>
         <option name="resolveModulePerSourceSet" value="false" />
-        <option name="useQualifiedModuleNames" value="true" />
       </GradleProjectSettings>
     </option>
   </component>

.idea/inspectionProfiles/Project_Default.xml

@@ -0,0 +1,13 @@
+<component name="InspectionProjectProfileManager">
+  <profile version="1.0">
+    <option name="myName" value="Project Default" />
+    <inspection_tool class="ConstantConditions" enabled="true" level="WARNING" enabled_by_default="true">
+      <option name="SUGGEST_NULLABLE_ANNOTATIONS" value="false" />
+      <option name="DONT_REPORT_TRUE_ASSERT_STATEMENTS" value="false" />
+    </inspection_tool>
+    <inspection_tool class="SerializableHasSerialVersionUIDField" enabled="true" level="WARNING" enabled_by_default="true">
+      <option name="ignoreAnonymousInnerClasses" value="false" />
+      <option name="superClassString" value="java.awt.Component" />
+    </inspection_tool>
+  </profile>
+</component>

.idea/misc.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_11" default="false" project-jdk-name="Android API 30 Platform" project-jdk-type="Android SDK">
     <output url="file://$PROJECT_DIR$/build/classes" />
   </component>
   <component name="ProjectType">

.idea/runConfigurations.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="RunConfigurationProducerService">
+    <option name="ignoredProducers">
+      <set>
+        <option value="com.android.tools.idea.compose.preview.runconfiguration.ComposePreviewRunConfigurationProducer" />
+      </set>
+    </option>
+  </component>
+</project>

app/build.gradle

@@ -10,8 +10,8 @@ android {
         applicationId "de.joel.zoomhelper"
         minSdkVersion 21
         targetSdkVersion 30
-        versionCode 13
-        versionName '0.4.9'
+        versionCode 15
+        versionName '0.5.1'
 
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
@@ -36,10 +36,10 @@ repositories {
 
 dependencies {
 
-    implementation 'androidx.appcompat:appcompat:1.2.0'
+    implementation 'androidx.appcompat:appcompat:1.3.0'
     implementation 'com.google.android.material:material:1.3.0'
     implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
-    implementation 'androidx.lifecycle:lifecycle-process:2.2.0'
+    implementation 'androidx.lifecycle:lifecycle-process:2.3.1'
     testImplementation 'junit:junit:4.13.2'
     androidTestImplementation 'androidx.test.ext:junit:1.1.2'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'

app/src/main/AndroidManifest.xml

@@ -11,7 +11,7 @@
 
 
     <application
-        android:allowBackup="true"
+        android:allowBackup="false"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
         android:roundIcon="@mipmap/ic_launcher_round"

app/src/main/java/de/joel/zoomhelper/APKDownloader.java

@@ -0,0 +1,82 @@
+package de.joel.zoomhelper;
+
+import android.app.Activity;
+import android.app.DownloadManager;
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.net.Uri;
+import android.os.Build;
+import android.os.Environment;
+import android.provider.Settings;
+import android.util.Log;
+import android.widget.Toast;
+
+import androidx.core.content.FileProvider;
+
+import java.io.File;
+import java.util.Timer;
+import java.util.TimerTask;
+
+public class APKDownloader {
+    public void downloadAPK(Context context, String fileName, Uri uri) {
+        Activity act = (Activity)context;
+        File destination = new File(context.getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS).getAbsolutePath(), fileName);
+
+        if (Build.VERSION.SDK_INT > Build.VERSION_CODES.O) {
+            if (!context.getPackageManager().canRequestPackageInstalls()) {
+                Toast.makeText(context, R.string.PleaseAllowUnknownSources, Toast.LENGTH_LONG).show();
+                act.startActivityForResult(new Intent(Settings.ACTION_MANAGE_UNKNOWN_APP_SOURCES, Uri.parse("package:de.joel.zoomhelper")), 101);
+                Timer timer = new Timer(true);
+                timer.scheduleAtFixedRate(new TimerTask() {
+                    @Override
+                    public void run() {
+                        if (context.getPackageManager().canRequestPackageInstalls()) {
+                            act.finishActivity(101);
+                            downloadAPK(context, fileName, uri);
+                            timer.cancel();
+                        }
+                    }
+                }, 0, 1000);
+                return;
+            }
+        }
+
+        //Delete update file if exists
+        final Uri localUri = FileProvider.getUriForFile(context, BuildConfig.APPLICATION_ID + ".provider", destination);
+        if (destination.exists()) {
+            //noinspection ResultOfMethodCallIgnored
+            destination.delete();
+        }
+
+        //Download Script
+        DownloadManager downloadManager = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);
+        DownloadManager.Request request = new DownloadManager.Request(uri);
+        request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
+        Log.d("Desturi", localUri.getPath());
+        request.setDestinationInExternalFilesDir(context, Environment.DIRECTORY_DOWNLOADS, fileName);
+        final long downloadID = downloadManager.enqueue(request);
+
+        BroadcastReceiver onDownloadComplete = new BroadcastReceiver() {
+            @Override
+            public void onReceive(Context context, Intent intent) {
+                //Fetching the download id received with the broadcast
+                long id = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, -1);
+                //Checking if the received broadcast is for our enqueued download by matching download id
+                if (downloadID == id) {
+                    Intent install = new Intent(Intent.ACTION_VIEW);
+                    install.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
+                    install.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
+                    install.putExtra(Intent.EXTRA_NOT_UNKNOWN_SOURCE, true);
+                    install.setDataAndType(localUri,
+                            downloadManager.getMimeTypeForDownloadedFile(downloadID));
+                    context.startActivity(install);
+
+                    context.unregisterReceiver(this);
+                }
+            }
+        };
+        context.registerReceiver(onDownloadComplete, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));
+    }
+}

app/src/main/java/de/joel/zoomhelper/Attendee.java

@@ -0,0 +1,30 @@
+package de.joel.zoomhelper;
+
+import java.io.Serializable;
+
+public class Attendee implements Serializable {
+    private static final long serialVersionUID = 6196688086302483907L;
+    private String name;
+    private String num;
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getNum() {
+        return num;
+    }
+
+    public void setNum(String num) {
+        this.num = num;
+    }
+
+    public Attendee(String name, String num) {
+        this.name = name;
+        this.num = num;
+    }
+}

app/src/main/java/de/joel/zoomhelper/BackupController.java

@@ -0,0 +1,111 @@
+package de.joel.zoomhelper;
+
+import android.annotation.SuppressLint;
+import android.app.Activity;
+import android.content.Context;
+import android.content.Intent;
+import android.content.SharedPreferences;
+import android.net.Uri;
+import android.os.Build;
+import android.os.Environment;
+
+import androidx.annotation.RequiresApi;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.security.InvalidAlgorithmParameterException;
+import java.security.InvalidKeyException;
+import java.security.NoSuchAlgorithmException;
+import java.security.spec.InvalidKeySpecException;
+
+import javax.crypto.BadPaddingException;
+import javax.crypto.IllegalBlockSizeException;
+import javax.crypto.NoSuchPaddingException;
+
+public class BackupController {
+
+    @RequiresApi(api = Build.VERSION_CODES.O)
+    public void backup(Activity activity) {
+        Encrypter encrypter = new Encrypter();
+        SharedPreferences mPrefs = activity.getPreferences(Context.MODE_PRIVATE);
+        String value = mPrefs.getString("Meetings", "");
+        File destination = new File(activity.getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS).getAbsolutePath(), "backup.tmp");
+
+        try {
+            writeStringToFile(value, destination.getAbsolutePath());
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        //TODO: Eingabefeld für Passwort
+        try {
+            encrypter.encrypt(destination.getAbsolutePath(), "test");
+        } catch (BadPaddingException | IllegalBlockSizeException | IOException | NoSuchAlgorithmException | InvalidKeySpecException | InvalidAlgorithmParameterException | InvalidKeyException | NoSuchPaddingException e) {
+            e.printStackTrace();
+        }
+        //noinspection ResultOfMethodCallIgnored
+        destination.delete();
+        destination = new File(activity.getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS).getAbsolutePath(), "backup.zoomhelper");
+
+        shareFile(destination, activity);
+
+    }
+
+    public void restore(Activity activity) {
+       new FileChooser(activity).openFile();
+    }
+
+
+    @SuppressLint("ApplySharedPref")
+    public void restore(Activity activity, InputStream inp) {
+        Encrypter encrypter = new Encrypter();
+        SharedPreferences mPrefs = activity.getPreferences(Context.MODE_PRIVATE);
+
+        String decrypted = null;
+
+        //TODO: Passwort einlesen aus Eingabefeld
+        try {
+            decrypted = encrypter.decrypt(inp, "test");
+        } catch (IOException | InvalidAlgorithmParameterException | InvalidKeyException | NoSuchPaddingException | NoSuchAlgorithmException | InvalidKeySpecException | IllegalBlockSizeException | BadPaddingException e) {
+            e.printStackTrace();
+        }
+
+        //TODO: Hinweis, dass Daten mit den Daten aus dem Backup überschrieben werden...
+
+        SharedPreferences.Editor prefsEditor = mPrefs.edit();
+        prefsEditor.putString("Meetings",decrypted);
+        prefsEditor.commit();
+
+        prefsEditor.putString("lastMeeting", "0");
+
+        //TODO: Fehlermeldung bei falschem Passwort
+    }
+
+
+
+    public void writeStringToFile(String str, String fileName)
+            throws IOException {
+        FileOutputStream outputStream = new FileOutputStream(fileName);
+        byte[] strToBytes = str.getBytes();
+        outputStream.write(strToBytes);
+
+        outputStream.close();
+    }
+
+
+    public void shareFile(File file, Activity activity){
+        Intent intentShareFile = new Intent(Intent.ACTION_SEND);
+
+        if(file.exists()) {
+            intentShareFile.setType("application/octet-stream");
+            intentShareFile.putExtra(Intent.EXTRA_STREAM, Uri.parse(file.getAbsolutePath()));
+
+            intentShareFile.putExtra(Intent.EXTRA_SUBJECT,
+                    "Sharing File...");
+            intentShareFile.putExtra(Intent.EXTRA_TEXT, "Sharing File...");
+
+            activity.startActivity(Intent.createChooser(intentShareFile, "Share File"));
+        }
+    }
+}

app/src/main/java/de/joel/zoomhelper/Encrypter.java

@@ -0,0 +1,154 @@
+package de.joel.zoomhelper;
+
+import android.os.Build;
+import android.os.Environment;
+
+import androidx.annotation.RequiresApi;
+
+import java.io.ByteArrayOutputStream;
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.security.InvalidAlgorithmParameterException;
+import java.security.InvalidKeyException;
+import java.security.NoSuchAlgorithmException;
+import java.security.spec.InvalidKeySpecException;
+import java.security.SecureRandom;
+
+import javax.crypto.BadPaddingException;
+import javax.crypto.Cipher;
+import javax.crypto.IllegalBlockSizeException;
+import javax.crypto.NoSuchPaddingException;
+import javax.crypto.SecretKeyFactory;
+import javax.crypto.SecretKey;
+import javax.crypto.spec.SecretKeySpec;
+import java.security.spec.KeySpec;
+import javax.crypto.spec.PBEKeySpec;
+import javax.crypto.spec.IvParameterSpec;
+
+public class Encrypter {
+
+    @RequiresApi(api = Build.VERSION_CODES.O)
+    public void encrypt(String inputFile, String password) throws BadPaddingException, IllegalBlockSizeException, IOException, NoSuchAlgorithmException, InvalidKeySpecException, InvalidAlgorithmParameterException, InvalidKeyException, NoSuchPaddingException {
+        SecureRandom srandom = null;
+        try {
+            srandom = SecureRandom.getInstanceStrong();
+        } catch (NoSuchAlgorithmException e) {
+            e.printStackTrace();
+        }
+        byte[] salt = new byte[8];
+        assert srandom != null;
+        srandom.nextBytes(salt);
+        SecretKeyFactory factory =
+                SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256");
+
+        KeySpec spec = new PBEKeySpec(password.toCharArray(), salt, 10000, 128);
+        SecretKey tmp = factory.generateSecret(spec);
+        SecretKeySpec skey = new SecretKeySpec(tmp.getEncoded(), "AES");
+
+        byte[] iv = new byte[128 / 8];
+        srandom.nextBytes(iv);
+        IvParameterSpec ivspec = new IvParameterSpec(iv);
+
+        FileOutputStream out = null;
+        out = new FileOutputStream(inputFile + ".enc");
+        out.write(salt);
+        out.write(iv);
+
+        Cipher ci = null;
+
+        ci = Cipher.getInstance("AES/CBC/PKCS5Padding");
+
+        ci.init(Cipher.ENCRYPT_MODE, skey, ivspec);
+
+        try (FileInputStream in = new FileInputStream(inputFile)) {
+            processFile(ci, in, out);
+        }
+
+    }
+
+    static private void processFile(Cipher ci, InputStream in, OutputStream out)
+            throws javax.crypto.IllegalBlockSizeException,
+            javax.crypto.BadPaddingException,
+            java.io.IOException {
+        byte[] ibuf = new byte[1024];
+        int len;
+        while ((len = in.read(ibuf)) != -1) {
+            byte[] obuf = ci.update(ibuf, 0, len);
+            if (obuf != null) out.write(obuf);
+        }
+        byte[] obuf = ci.doFinal();
+        if (obuf != null) out.write(obuf);
+    }
+
+    @SuppressWarnings("ResultOfMethodCallIgnored")
+    public String decrypt(String inputFile, String password) throws IOException, InvalidAlgorithmParameterException, InvalidKeyException, NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeySpecException, IllegalBlockSizeException, BadPaddingException {
+        FileInputStream in = new FileInputStream(inputFile);
+        byte[] salt = new byte[8], iv = new byte[128 / 8];
+        in.read(salt);
+        in.read(iv);
+
+        SecretKeyFactory factory =
+                SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256");
+
+        KeySpec spec = new PBEKeySpec(password.toCharArray(), salt, 10000, 128);
+        SecretKey tmp = factory.generateSecret(spec);
+        SecretKeySpec skey = new SecretKeySpec(tmp.getEncoded(), "AES");
+
+        Cipher ci = Cipher.getInstance("AES/CBC/PKCS5Padding");
+        ci.init(Cipher.DECRYPT_MODE, skey, new IvParameterSpec(iv));
+
+
+        OutputStream out = new OutputStream() {
+            private final StringBuilder string = new StringBuilder();
+
+            @Override
+            public void write(int b) throws IOException {
+                this.string.append((char) b );
+            }
+
+            //Netbeans IDE automatically overrides this toString()
+            public String toString() {
+                return this.string.toString();
+            }
+        };
+        processFile(ci, in, out);
+        return out.toString();
+    }
+
+    public String decrypt(InputStream in, String password) throws IOException, InvalidAlgorithmParameterException, InvalidKeyException, NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeySpecException, IllegalBlockSizeException, BadPaddingException {
+        byte[] salt = new byte[8], iv = new byte[128 / 8];
+        in.read(salt);
+        in.read(iv);
+
+        SecretKeyFactory factory =
+                SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256");
+
+        KeySpec spec = new PBEKeySpec(password.toCharArray(), salt, 10000, 128);
+        SecretKey tmp = factory.generateSecret(spec);
+        SecretKeySpec skey = new SecretKeySpec(tmp.getEncoded(), "AES");
+
+        Cipher ci = Cipher.getInstance("AES/CBC/PKCS5Padding");
+        ci.init(Cipher.DECRYPT_MODE, skey, new IvParameterSpec(iv));
+
+
+        OutputStream out = new OutputStream() {
+            private final StringBuilder string = new StringBuilder();
+
+            @Override
+            public void write(int b) throws IOException {
+                this.string.append((char) b );
+            }
+
+            //Netbeans IDE automatically overrides this toString()
+            public String toString() {
+                return this.string.toString();
+            }
+        };
+        processFile(ci, in, out);
+        return out.toString();
+    }
+}

app/src/main/java/de/joel/zoomhelper/FileChooser.java

@@ -0,0 +1,22 @@
+package de.joel.zoomhelper;
+
+import android.app.Activity;
+import android.content.Intent;
+
+import java.io.File;
+
+public class FileChooser {
+    // Request code for selecting a PDF document.
+    private final Activity act;
+
+    public FileChooser (Activity act) {
+        this.act = act;
+    }
+
+    public void openFile() {
+        Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
+        intent.addCategory(Intent.CATEGORY_OPENABLE);
+        intent.setType("application/octet-stream");
+        act.startActivityForResult(intent, 2);
+    }
+}

app/src/main/java/de/joel/zoomhelper/InstantAutoComplete.java

@@ -0,0 +1,25 @@
+package de.joel.zoomhelper;
+
+import android.content.Context;
+import android.util.AttributeSet;
+
+public class InstantAutoComplete extends androidx.appcompat.widget.AppCompatAutoCompleteTextView {
+
+    public InstantAutoComplete(Context context) {
+        super(context);
+    }
+
+    public InstantAutoComplete(Context arg0, AttributeSet arg1) {
+        super(arg0, arg1);
+    }
+
+    public InstantAutoComplete(Context arg0, AttributeSet arg1, int arg2) {
+        super(arg0, arg1, arg2);
+    }
+
+    @Override
+    public boolean enoughToFilter() {
+        return false;
+    }
+
+}

app/src/main/java/de/joel/zoomhelper/Meeting.java

@@ -0,0 +1,109 @@
+package de.joel.zoomhelper;
+
+import android.content.Intent;
+
+import java.io.Serializable;
+import java.util.ArrayList;
+
+public class Meeting implements Serializable {
+    private static final long serialVersionUID = 2606722401897866931L;
+    private String meetingName;
+    private String meetingID;
+    private String meetingPWD;
+    private ArrayList<Attendee> attendees;
+    private int lastAtt;
+
+    public String getMeetingName() {
+        return meetingName;
+    }
+
+    public void setMeetingName(String meetingName) {
+        this.meetingName = meetingName;
+    }
+
+    public String getMeetingID() {
+        return meetingID;
+    }
+
+    public void setMeetingID(String meetingID) {
+        this.meetingID = meetingID;
+    }
+
+    public String getMeetingPWD() {
+        return meetingPWD;
+    }
+
+    public void setMeetingPWD(String meetingPWD) {
+        this.meetingPWD = meetingPWD;
+    }
+
+    public ArrayList<Attendee> getAttendees() {
+        return attendees;
+    }
+
+    public void setAttendees(ArrayList<Attendee> attendees) {
+        this.attendees = attendees;
+    }
+
+    public int getLastAtt() {
+        return lastAtt;
+    }
+
+    public void setLastAtt(int lastAtt) {
+        this.lastAtt = lastAtt;
+    }
+
+    public Meeting(String meetingName, String meetingID, String meetingPWD, String nameAttendee, String numAttendee) {
+        this.meetingName = meetingName;
+        this.meetingID = meetingID;
+        this.meetingPWD = meetingPWD;
+        this.attendees = new ArrayList<>();
+        Attendee attendee = new Attendee(nameAttendee, numAttendee);
+        this.attendees.add(attendee);
+        this.lastAtt = 0;
+    }
+
+    public void addAttendee(String name, String num) {
+        Attendee attendee = new Attendee(name, num);
+        this.attendees.add(attendee);
+        this.lastAtt = attendees.size() - 1;
+    }
+
+    public int searchAttendee(String name) {
+        int found = -1;
+        for (int i = 0; i < this.attendees.size(); i++) {
+            if (this.attendees.get(i).getName().equals(name)) {
+                found = i;
+                break;
+            }
+        }
+        return found;
+    }
+
+    public void updateAttendee(String name, String num) {
+
+        int found = searchAttendee(name);
+
+        if (found == -1) {
+            addAttendee(name, num);
+        } else {
+            this.attendees.get(found).setNum(num);
+            this.lastAtt = found;
+        }
+    }
+
+    public String info() {
+        return "Meeting Name: " + this.meetingName + "\n" +
+                "Meeting-ID: " + this.meetingID + "\n" +
+                "Kenncode: " + this.meetingPWD;
+    }
+
+    public Intent share() {
+        final Intent sendIntent = new Intent();
+        sendIntent.setAction(Intent.ACTION_SEND);
+        sendIntent.putExtra(Intent.EXTRA_TEXT, this.info());
+        sendIntent.setType("text/plain");
+
+        return Intent.createChooser(sendIntent, null);
+    }
+}

app/src/main/java/de/joel/zoomhelper/MeetingImportController.java

@@ -0,0 +1,118 @@
+package de.joel.zoomhelper;
+
+import android.content.Intent;
+import android.widget.Toast;
+
+import androidx.appcompat.app.AlertDialog;
+
+import java.util.ArrayList;
+import java.util.Objects;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class MeetingImportController {
+    private final MeetingsController meetingsController;
+    private final MainActivity act;
+
+    public MeetingImportController(MeetingsController meetingsController, MainActivity act) {
+        this.meetingsController = meetingsController;
+        this.act = act;
+    }
+
+    public void handleSendText(Intent intent) {
+        final String sharedText = intent.getStringExtra(Intent.EXTRA_TEXT);
+        handleSendText(sharedText);
+    }
+
+    public void handleSendText(String sharedText) {
+        handleSendText(sharedText, false);
+    }
+
+    public boolean handleSendText(String sharedText, boolean checkOnly) {
+        String meetingID = "";
+        String meetingPWD = "";
+        String meetingName = "";
+
+        if (sharedText != null) {
+            Matcher matcher = Pattern.compile("(?i)(?<=(Meeting-ID:)|(Meeting\\sID:)|(ID:)).+").matcher(sharedText);
+            if (matcher.find()) {
+                meetingID = Objects.requireNonNull(matcher.group(0)).trim();
+            }
+            matcher = Pattern.compile("(?i)(?<=(Kenncode:)|(Passwort:)|(Passcode:)|(Password:)).+").matcher(sharedText);
+            if (matcher.find()) {
+                meetingPWD = Objects.requireNonNull(matcher.group(0)).trim();
+            }
+            matcher = Pattern.compile("(?i)(?<=(Thema:)|(Meeting\\sName:)|(Topic:)).+").matcher(sharedText);
+            if (matcher.find()) {
+                meetingName = Objects.requireNonNull(matcher.group(0)).trim();
+            }
+
+            final AlertDialog.Builder builder = new AlertDialog.Builder(act);
+            builder.setTitle(R.string.app_name);
+            builder.setMessage(R.string.meetingAlreadyExists);
+
+            if (meetingID.equals("")) {
+                builder.setMessage(R.string.importError);
+                builder.setPositiveButton(R.string.ok, (dialog, which) -> dialog.dismiss());
+                final AlertDialog alert = builder.create();
+                if (!checkOnly) alert.show();
+                return false;
+            } else {
+
+                final Meeting mtgToImport = new Meeting(meetingName, meetingID, meetingPWD, "", "");
+
+                if (meetingsController.searchMeetingInList(meetingsController.getMeetings(), mtgToImport.getMeetingName()) == -1 && !checkOnly) {
+                    act.fillMeeting(mtgToImport);
+                } else {
+                    builder.setPositiveButton(R.string.override, (dialog, which) -> {
+                        final int found = meetingsController.searchMeetingInList(meetingsController.getMeetings(), mtgToImport.getMeetingName());
+                        importMeeting(mtgToImport, false);
+                        act.fillMeeting(found);
+                        dialog.dismiss();
+                    });
+                    builder.setNegativeButton(R.string.rename, (dialog, which) -> {
+                        mtgToImport.setMeetingName("");
+                        act.fillMeeting(mtgToImport);
+                        dialog.dismiss();
+                    });
+                    final AlertDialog alert = builder.create();
+                    if (!checkOnly) alert.show();
+                    return true;
+                }
+            }
+        }
+        return true;
+    }
+
+    public void importMeeting(Meeting meeting, boolean updateAttendee) {
+        final ArrayList<Meeting> listMeetings = meetingsController.getMeetings();
+        final int foundCurr = meetingsController.searchMeetingInList(listMeetings, meeting.getMeetingName());
+
+        if (foundCurr == -1) {
+            listMeetings.add(meeting);
+            if (listMeetings.size() == 1) {
+                meetingsController.setLastMeeting(0);
+            } else {
+                meetingsController.setLastMeeting(listMeetings.size() - 1);
+            }
+
+        } else {
+            final Meeting currMeeting = meetingsController.getMeetings().get(foundCurr);
+            currMeeting.setMeetingID(meeting.getMeetingID());
+            currMeeting.setMeetingPWD(meeting.getMeetingPWD());
+            if (updateAttendee)
+                currMeeting.updateAttendee(meeting.getAttendees().get(0).getName(), meeting.getAttendees().get(0).getNum());
+            listMeetings.set(foundCurr, currMeeting);
+            meetingsController.setLastMeeting(foundCurr);
+        }
+        meetingsController.saveMeetingList(listMeetings);
+        act.fillDropdownMeetingName();
+        act.fillDropdownAttendeeName(meetingsController.getLastMeeting());
+        Toast.makeText(act, R.string.meetingSaved, Toast.LENGTH_SHORT).show();
+    }
+
+    public void importMeeting(Meeting meeting) {
+        importMeeting(meeting, true);
+    }
+
+}

app/src/main/java/de/joel/zoomhelper/MeetingsController.java

@@ -0,0 +1,173 @@
+package de.joel.zoomhelper;
+
+import android.annotation.SuppressLint;
+import android.app.Activity;
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.util.Base64;
+
+import androidx.appcompat.app.AlertDialog;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.EOFException;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.util.ArrayList;
+
+public class MeetingsController {
+    private final Context context;
+    private final Activity activity;
+
+    public MeetingsController(Context context) {
+        this.context = context;
+        this.activity = (Activity) context;
+    }
+
+
+
+    public String meetingsToString(ArrayList<Meeting> listMeetings) {
+        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
+        ObjectOutputStream objOutputStream = null;
+        try {
+            objOutputStream = new ObjectOutputStream(byteArrayOutputStream);
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        for (Object obj : listMeetings) {
+
+            try {
+                if (objOutputStream == null) throw new AssertionError();
+                objOutputStream.writeObject(obj);
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+            try {
+                objOutputStream.reset();
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+        }
+        try {
+            if (objOutputStream == null) throw new AssertionError();
+            objOutputStream.close();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        return Base64.encodeToString(byteArrayOutputStream.toByteArray(), 0);
+    }
+
+
+    public ArrayList<Meeting> stringToMeetings(String string) {
+        byte[] bytes = Base64.decode(string, 0);
+
+        ArrayList<Meeting> listMeetings = new ArrayList<>();
+        ByteArrayInputStream bis = new ByteArrayInputStream(bytes);
+        ObjectInputStream obj = null;
+        try {
+            obj = new ObjectInputStream(bis);
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        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 | ClassNotFoundException e) {
+            e.printStackTrace();
+        }
+        return listMeetings;
+    }
+
+    @SuppressLint("ApplySharedPref")
+    public void saveMeetingList(ArrayList<Meeting> meetingList) {
+        SharedPreferences mPrefs = activity.getPreferences(Context.MODE_PRIVATE);
+        SharedPreferences.Editor prefsEditor = mPrefs.edit();
+        prefsEditor.putString("Meetings", meetingsToString(meetingList));
+        prefsEditor.commit();
+    }
+
+    @SuppressLint("ApplySharedPref")
+    public void setLastMeeting(int id) {
+        SharedPreferences mPrefs = activity.getPreferences(Context.MODE_PRIVATE);
+        SharedPreferences.Editor prefsEditor = mPrefs.edit();
+        prefsEditor.putInt("LastMeeting", id);
+        prefsEditor.commit();
+    }
+
+    public int getLastMeeting() {
+        SharedPreferences mPrefs = activity.getPreferences(Context.MODE_PRIVATE);
+        return mPrefs.getInt("LastMeeting", -1);
+    }
+
+
+    public ArrayList<Meeting> getMeetings() {
+        SharedPreferences mPrefs = activity.getPreferences(Context.MODE_PRIVATE);
+        String value = mPrefs.getString("Meetings", "");
+        ArrayList<Meeting> meetingList;
+        if (value.equals("")) {
+            meetingList = new ArrayList<>();
+        } else {
+            meetingList = stringToMeetings(value);
+        }
+        return meetingList;
+    }
+
+    //TODO: Nach Remove bleibt Meeting noch stehen
+    public void removeMeeting(int meeting) {
+        MainActivity act = (MainActivity)context;
+        ArrayList<Meeting> meetings = getMeetings();
+        if (meetings.size() > 0 && meeting != -1) {
+
+            AlertDialog.Builder builder = new AlertDialog.Builder(context);
+
+            builder.setTitle(R.string.app_name);
+            builder.setMessage(context.getString(R.string.suretoremove, meetings.get(meeting).getMeetingName()));
+
+            builder.setPositiveButton(R.string.yes, (dialog, which) -> {
+                dialog.dismiss();
+                meetings.remove(meeting);
+                saveMeetingList(meetings);
+
+                if (meetings.size() > 1) {
+                    act.fillDropdownMeetingName();
+                    if (getLastMeeting() > meetings.size() - 1) {
+                        setLastMeeting(meetings.size() - 1);
+                        act.fillMeeting(getLastMeeting());
+                    }
+                } else if (meetings.size() == 1) {
+                    setLastMeeting(0);
+                    act.fillDropdownMeetingName();
+                    act.fillMeeting(getLastMeeting());
+                } else {
+                    setLastMeeting(-1);
+                    act.fillDropdownMeetingName();
+                    act.fillBlank();
+                }
+            });
+
+            builder.setNegativeButton(R.string.no, (dialog, which) -> dialog.dismiss());
+
+            AlertDialog alert = builder.create();
+            alert.show();
+
+        }
+    }
+
+    public int searchMeetingInList(ArrayList<Meeting> meetings, String name) {
+        int found = -1;
+        for (int i = 0; i < meetings.size(); i++) {
+            if (meetings.get(i).getMeetingName().equals(name)) {
+                found = i;
+                break;
+            }
+        }
+        return found;
+    }
+}

app/src/main/java/de/joel/zoomhelper/ZoomLink.java

@@ -0,0 +1,51 @@
+package de.joel.zoomhelper;
+
+import android.content.Context;
+import android.content.Intent;
+import android.net.Uri;
+
+import java.util.Objects;
+
+public class ZoomLink {
+    private final Meeting meeting;
+    private final Context context;
+
+    public ZoomLink(Context context, Meeting meeting) {
+        this.meeting = meeting;
+        this.context = context;
+    }
+
+
+
+
+    private String buildZoomURL() {
+        Uri.Builder builder = new Uri.Builder();
+        builder.scheme("zoomus")
+                .authority("zoom.us")
+                .appendPath("join")
+                .appendQueryParameter("confno", this.meeting.getMeetingID().replace(" ", ""))
+                .appendQueryParameter("pwd", this.meeting.getMeetingPWD());
+
+        if (!Objects.equals(this.meeting.getAttendees().get(this.meeting.getLastAtt()).getNum(), "")) {
+            builder.appendQueryParameter("uname", this.meeting.getAttendees().get(this.meeting.getLastAtt()).getName() + " (" + this.meeting.getAttendees().get(this.meeting.getLastAtt()).getNum() + ")");
+        } else
+            builder.appendQueryParameter("uname", this.meeting.getAttendees().get(this.meeting.getLastAtt()).getName());
+        return builder.build().toString();
+    }
+
+    public void launch() {
+        String url = buildZoomURL();
+        Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
+        if (intent.resolveActivity(context.getPackageManager()) != null) {
+            context.startActivity(intent);
+        }
+        /*if (testing) {
+            //For Debugging: Show URL in Alert
+            AlertDialog.Builder dialog = new AlertDialog.Builder(this);
+            dialog.setMessage(url);
+            dialog.setTitle("Zoom URL (for testing)");
+            AlertDialog alertDialog = dialog.create();
+            alertDialog.show();
+        }*/
+    }
+}

app/src/main/res/layout/buttons.xml

@@ -11,8 +11,7 @@
         android:layout_marginTop="22dp"
         android:onClick="btnSave_onClick"
         android:text="@string/Save"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toBottomOf="@+id/imageTrash" />
+        app:layout_constraintStart_toStartOf="parent" />
 
     <Button
         android:id="@+id/btnJoin"

app/src/main/res/menu/menu.xml

@@ -0,0 +1,10 @@
+<menu xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:id="@+id/menu_backup"
+        android:title="@string/backup" />
+    <item android:id="@+id/menu_restore"
+        android:title="@string/restore" />
+    <item android:id="@+id/menu_settings"
+        android:title="@string/settings" />
+    <item android:id="@+id/menu_info"
+        android:title="@string/info" />
+</menu>

app/src/main/res/values/strings.xml

@@ -28,7 +28,7 @@
     <string name="alwaysAsk">Dialog immer anzeigen</string>
     <string name="wantToimportMeeting">Möchtest du das folgende Meeting importieren?</string>
     <string name="importError">"Dieser Text entspricht keinem für ZoomHelper bekannten Meetingeinladungs-Muster "</string>
-    <string name="ok">ok</string>
+    <string name="ok">OK</string>
     <string name="meetingAlreadyExists">Meeting unter diesem Namen existiert schon. Bitte umbenennen, ansonsten wird es beim Speichern überschrieben</string>
     <string name="override">überschreiben</string>
     <string name="rename">umbenennen</string>
@@ -39,5 +39,11 @@
     <string name="cantCreateShortcut">Du musst das Meeting zunächst speichern, bevor du eine Verknüpfung dazu erstellen kannst</string>
     <string name="saveMeeting">Meeting speichern</string>
     <string name="cancel">abbrechen</string>
+    <string name="meetingSaved">Meeting gespeichert</string>
+    <string name="meetingWithoutID">Meeting kann nicht ohne ID gespeichert werden!</string>
+    <string name="backup">Daten sichern</string>
+    <string name="restore">Daten wiederherstellen</string>
+    <string name="settings">Einstellungen</string>
+    <string name="info">Info</string>
 
 </resources>