added sure to delete alert

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

@@ -2,6 +2,7 @@ package de.joel.zoomhelper;
 
 import android.annotation.SuppressLint;
 import android.content.Context;
+import android.content.DialogInterface;
 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.net.Uri;
@@ -109,27 +110,45 @@ public class MainActivity extends AppCompatActivity {
     private void removeMeeting(int meeting) {
         ArrayList<Meeting> meetings = getMeetings();
         if (meetings.size() > 0) {
-            meetings.remove(meeting);
-            saveMeetingList(meetings);
 
-            if (meetings.size() > 1) {
-                fillDropdownMeetingName();
-                if (getLastMeeting() > meetings.size()-1) {
-                    setLastMeeting(meetings.size()-1);
+            AlertDialog.Builder builder = new AlertDialog.Builder(this);
+
+            builder.setTitle(R.string.app_name);
+            builder.setMessage(getString(R.string.suretoremove, meetings.get(meeting).meetingName));
+
+            builder.setPositiveButton(R.string.yes, (dialog, which) -> {
+                dialog.dismiss();
+                meetings.remove(meeting);
+                saveMeetingList(meetings);
+
+                if (meetings.size() > 1) {
+                    fillDropdownMeetingName();
+                    if (getLastMeeting() > meetings.size()-1) {
+                        setLastMeeting(meetings.size()-1);
+                        fillMeeting(getLastMeeting());
+                    }
+                } else if (meetings.size() == 1) {
+                    setLastMeeting(0);
+                    fillDropdownMeetingName();
                     fillMeeting(getLastMeeting());
+                } else {
+                    setLastMeeting(-1);
+                    fillDropdownMeetingName();
+                    fillBlank();
                 }
-            } else if (meetings.size() == 1) {
-                setLastMeeting(0);
-                fillDropdownMeetingName();
-                fillMeeting(getLastMeeting());
-            } else {
-                setLastMeeting(-1);
-                fillDropdownMeetingName();
-                fillBlank();
-            }
+            });
+
+            builder.setNegativeButton(R.string.no, (dialog, which) -> {
+                dialog.dismiss();
+            });
+
+            AlertDialog alert = builder.create();
+            alert.show();
+
         }
     }
 
+
     private void fillBlank() {
         EditText editMeetingName = findViewById(R.id.TextMeetingName);
         EditText editID = findViewById(R.id.textBoxID);