connectToWifi in Future

MobileApp/app/src/main/java/com/example/lfrmobileapp/MainActivity.java

 
 import java.io.DataOutputStream;
 import java.io.IOException;
+import java.net.InetSocketAddress;
 import java.net.Socket;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.Future;
 
 public class MainActivity extends AppCompatActivity {
 
     private ActivityMainBinding binding;
     private ExtendedSocket socket;
-    private DataOutputStream outputStream;
     private DataTransferAsyncTask dataTransferAsyncTask;
     Boolean connected = false;
 
     }
 
     public boolean connectToWifi(String ipAddress, int port){
-
-        new Thread(new Runnable(){
-            public void run(){
-                try {
-                    Socket tempSocket = new Socket(ipAddress, port);
-                    socket = new ExtendedSocket(tempSocket);
-                    socket.sendMessage("Verbindung aufbauen");
-                    connected = true;
-
-                } catch (Exception e) {
-                    e.printStackTrace();
-                    connected = false;
-                }
+        ExecutorService executor = Executors.newSingleThreadExecutor();
+        Future<Boolean> future = executor.submit(() -> {
+            Socket tempSocket = new Socket();
+            tempSocket.connect(new InetSocketAddress(ipAddress, port), 1000);
+            try {
+                socket = new ExtendedSocket(tempSocket);
+                socket.sendMessage("Verbindung aufbauen");
+            } catch (Exception e) {
+                socket.closeSocket();
+                return false;
             }
-        }).start();
+            return true;
+        });
+
+        try {
+            connected = future.get();
+        } catch (InterruptedException e) {
+            System.err.println("InterruptedException: " + e.getMessage());
+        } catch (ExecutionException e) {
+            System.err.println("ExecutionException: " + e.getCause().getMessage());
+        }
+
+        executor.shutdown();
 
         if(connected){
             dataTransferAsyncTask = new DataTransferAsyncTask(socket);
             return false;
         }
     }
+
+    public void sendTelegram(String telegram)
+    {
+        this.dataTransferAsyncTask.writeTelegram(telegram);
+    }
 }