MainActivity

public class MainActivity extends AppCompatActivity
{
    private boolean isCableConnected = false;
    private boolean cableStateChanged = false;
    private boolean popupWasShown = false;

    public static final String IS_CONNECTED_KEY = "isConnectedValue";

    public void startOtgService()
    {
        startService(new Intent(MainActivity.this, OtgService.class));

    }

    public void stopOtgService()
    {
        stopService(new Intent(MainActivity.this, OtgService.class));

    }

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View view)
            {
                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
            }
        });

        Button startButton = (Button)this.findViewById(R.id.startButton);
        Button stopButton = (Button)this.findViewById(R.id.stopButton);
        //startAlarm();

        startButton.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                startOtgService();
            }
        });

        stopButton.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                stopOtgService();
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu)
    {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);

        //menu.findItem(R.id.action_cable).setVisible(false);

        return true;
    }

    @Override
    public boolean onPrepareOptionsMenu(Menu menu){
        MenuItem item = menu.findItem(R.id.action_cable);
        if (cableStateChanged && !popupWasShown) {
            item.setVisible(true);
            cableStateChanged = false;
        } else if (popupWasShown) {
            item.setVisible(false);
        }
        return super.onPrepareOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item)
    {
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings)
        {
            return true;
        }
        else if(id ==  R.id.action_cable)
        {
            popupWasShown = true;
            invalidateOptionsMenu();
            // You can change the popup title, message and buttons here
            AlertDialog.Builder builder = new AlertDialog.Builder(this);
            builder.setTitle(isCableConnected ? "Cable was connected" : "Cable was disconnected");
            builder.setMessage("foo bar");
            builder.setPositiveButton("OK", null);
            builder.setNegativeButton(null, null);
            builder.create().show();
        }
        return super.onOptionsItemSelected(item);
    }

    private void cableStateWasChanged(boolean isConnected)
    {
        isCableConnected = isConnected;
        cableStateChanged = true;
        popupWasShown = false;
        invalidateOptionsMenu();
    }

    @Override
    protected void onNewIntent(Intent intent)
    {
        if (intent.getExtras() == null)
        {
            super.onNewIntent(intent);
            Log.e("###", "No extras");
            return;
        }

        if (intent.hasExtra(IS_CONNECTED_KEY))
        {
            Log.e("###", "Displaying dialog");

            boolean isConnected = intent.getExtras().getBoolean(IS_CONNECTED_KEY);

            final AlertDialog alertDialog = new AlertDialog.Builder(this).create();
            alertDialog.setTitle("Otg state changed");

            if (isConnected)
                alertDialog.setMessage("OTG connected");
            else
                alertDialog.setMessage("OTG disconnected");

            //alertDialog.setIcon(R.drawable.icon);

            alertDialog.show();
        }
        else
        {
            Log.e("###", "Does not contain key");
            super.onNewIntent(intent);
        }
    }
}