DAten von der Activity an einen Thread senden

public class MainActivity extends AppCompatActivity implements View.OnClickListener
    {
    private Thread networkThread = null;


    @Override
    protected void onCreate(Bundle savedInstanceState)
        {
        super.onCreate(savedInstanceState);


// Hier wird das Kommando übergeben
// Das möchte ich hier aber nicht, sondern später per Buttonklick
        networkThread = NetworkThread(mHandler, "GETSTATE");
        networkThread.start();
        }


    final Handler mHandler = new Handler()
        {
        public void handleMessage(Message msg)
            {
            Bundle bundle;
            if(msg.what==1)
                {
                bundle = msg.getData();


                Toast.makeText(getApplicationContext(),
                               String.valueOf(bundle.getInt("key1")),
                               Toast.LENGTH_LONG).show();
                }
            super.handleMessage(msg);
            }
        };


    public void onClick(View v)
        {
        if ( v == buttonSend )
            {
// hier sollen andere Kommandos gesendet werden
            }
        }
   }




// der Netztwerk.Thread:




    public class NetworkThread extends Thread
        {
        private static final String  SERVER_URL  = "Server";
        private static final int     SERVER_PORT = 8007;
        private Handler messageHandler;
        private String  messageSend;
        private String  messageReceive;
        public NetworkThread( Handler msgHandler, String msg )
            {
            this.messageHandler = msgHandler;
            this.messageSend    = msg;
            }
        // runnable
        public void run()
            {
        //create the bundle
            Bundle bundle = new Bundle(4);
            try
                {
                Socket socket = new Socket( SERVER_URL, SERVER_PORT );
                BufferedWriter out = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
                BufferedReader in  = new BufferedReader(new InputStreamReader(socket.getInputStream()));
    // Write request to server
                out.write(this.messageSend);
                out.flush();
    // read request response from server
                this.messageReceive = in.readLine();
    // Close the output stream
                out.close();
                in.close();
    // Close the socket connection
                socket.close();
                }
            catch(Exception ex)
                {
    //:TODO Handle exceptions
                }
        //create a message from the message handler to send it back to the main UI
            Message msg = this.messageHandler.obtainMessage();
        //specify the type of message
            msg.what = 1;
        //attach the bundle to the message
            msg.setData(bundle);
    //send the message back to main UI thread
            this.messageHandler.sendMessage(msg);
            }
        }

public class NetworkThread extends HandlerThread
    {
    public Handler handlerNetwork;


    public NetworkThread(String name)
        {
        super(name);
        }


    @Override
    protected void onLooperPrepared()
        {
        handlerNetwork = new Handler(getLooper())
            {
        @Override
            public void handleMessage(Message msg)
                {
    // process incoming messages here
    // this will run in non-ui/background thread
                }
            };
         }
     }

public class MainActivity extends AppCompatActivity implements View.OnClickListener
    {
    Button        button;
    TextView      textview;


    HandlerThread threadNetwork;
    @Override
    protected void onCreate(Bundle savedInstanceState)
        {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        textview = findViewById(R.id.textview);


        button = findViewById(R.id.button);
        button.setOnClickListener(this);


        threadNetwork = new HandlerThread("Network Handler");
        threadNetwork.start();
        }


    @Override
    protected void onDestroy ()
        {
        super.onDestroy();
        threadNetwork.quit();
        }


    public void onClick(View v)
        {
        if ( v == button )
            {
            Message msg = new Message();
            msg.what = 1;
            threadNetwork.handlerNetwork.sendMessage(msg);
            }
        return;
        }
    }