private static final int DIALOG_NO_SDCARD = 0;

    private LocalBroadcastManager broadcastManager;

    private ProgressDialog assetsDialog;

    public void onCreate(Bundle sis){

        super.onCreate(sis);

        setContentView(R.layout.activity_main);

        broadcastManager = LocalBroadcastManager.getInstance(getApplicationContext());

        Button startLocalGame = (Button)findViewById(R.id.startGame);

        Button startNetGame = (Button)findViewById(R.id.joinLobby);

        startLocalGame.setOnClickListener(startGameListener);

        startNetGame.setOnClickListener(startNetGameListener);

        if(!FileUtils.isDataPathAvailable()){

            showDialog(DIALOG_NO_SDCARD);

        } else {

            String existingVersion = "";

            try {

                File versionFile = new File(FileUtils.getCachePath(this), "assetsversion.txt");

                existingVersion = FileUtils.readToString(new FileInputStream(versionFile));

            } catch(IOException e) {

            }

            String newVersion = "";

            try {

                newVersion = FileUtils.readToString(getAssets().open("assetsversion.txt"));

            } catch(IOException e) {

            }

            if(!existingVersion.equals(newVersion)) {

                DownloadAssets assetsAsyncTask = new DownloadAssets(this);

                assetsDialog = ProgressDialog.show(this, "Please wait a moment", "Moving assets to SD card...");

                assetsAsyncTask.execute();

            }

        }

    }

    @Override

    protected void onResume() {

        super.onResume();

        broadcastManager.registerReceiver(connectedReceiver, new IntentFilter(Netplay.ACTION_CONNECTED));

        broadcastManager.registerReceiver(connectionFailedReceiver, new IntentFilter(Netplay.ACTION_DISCONNECTED));

        broadcastManager.registerReceiver(passwordRequestedReceiver, new IntentFilter(Netplay.ACTION_PASSWORD_REQUESTED));

    }

    @Override

    protected void onPause() {

        super.onPause();

        broadcastManager.unregisterReceiver(connectedReceiver);

        broadcastManager.unregisterReceiver(connectionFailedReceiver);

        broadcastManager.unregisterReceiver(passwordRequestedReceiver);

        Netplay netplay = Netplay.getAppInstance(getApplicationContext());

        if(netplay.getState() == State.CONNECTING) {

            netplay.disconnect();

        }

    }

    @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        super.onCreateOptionsMenu(menu);

        getMenuInflater().inflate(R.menu.main_options, menu);

        return true;

    }

    @Override

    public boolean onOptionsItemSelected(MenuItem item) {

        switch(item.getItemId()) {

        case R.id.download:

            startActivityForResult(new Intent(this, DownloadListActivity.class), 0);

            return true;

        case R.id.preferences:

            Toast.makeText(this, R.string.not_implemented_yet, Toast.LENGTH_SHORT).show();

            return true;

        case R.id.edit_weaponsets:

            startActivity(new Intent(this, WeaponsetListActivity.class));

            return true;

        case R.id.edit_teams:

            startActivity(new Intent(this, TeamListActivity.class));

            return true;

        default:

            return super.onOptionsItemSelected(item);

        }

    }

    public Dialog onCreateDialog(int id, Bundle args){

        switch(id) {

        case DIALOG_NO_SDCARD:

            return createNoSdcardDialog();

        default:

            throw new IndexOutOfBoundsException();

        }

    }

    private Dialog createNoSdcardDialog() {

        AlertDialog.Builder builder = new AlertDialog.Builder(this);

        builder.setTitle(R.string.sdcard_not_mounted_title);

        builder.setMessage(R.string.sdcard_not_mounted);

        builder.setNegativeButton(android.R.string.ok, new DialogInterface.OnClickListener(){

            public void onClick(DialogInterface dialog, int which) {

                finish();

            }

        });

        return builder.create();

    }

    public void onAssetsDownloaded(boolean result){

        if(!result){

            Toast.makeText(this, R.string.download_failed, Toast.LENGTH_LONG).show();

        }

        assetsDialog.dismiss();

    }

    private final OnClickListener startGameListener = new OnClickListener(){

        public void onClick(View v){

            startActivity(new Intent(getApplicationContext(), LocalRoomActivity.class));

        }

    };

    private final OnClickListener startNetGameListener = new OnClickListener() {

        public void onClick(View v) {

            State state = Netplay.getAppInstance(getApplicationContext()).getState();

            switch(state) {

            case NOT_CONNECTED:

                FragmentManager fm = getSupportFragmentManager();

                StartNetgameDialog startNetgameDialog = new StartNetgameDialog();

                startNetgameDialog.show(fm, "start_netgame_dialog");

                break;

            case CONNECTING:

                onNetConnectingStarted();

                break;

            default:

                startActivity(new Intent(getApplicationContext(), LobbyActivity.class));

                break;

            }

        }

    };

    private BroadcastReceiver connectedReceiver = new BroadcastReceiver() {

        @Override

        public void onReceive(Context context, Intent intent) {

            startActivity(new Intent(getApplicationContext(), LobbyActivity.class));

        }

    };

    private BroadcastReceiver connectionFailedReceiver = new BroadcastReceiver() {

        @Override

        public void onReceive(Context context, Intent intent) {

            if(intent.getBooleanExtra(Netplay.EXTRA_HAS_ERROR, true)) {

                Toast.makeText(getApplicationContext(), intent.getStringExtra(Netplay.EXTRA_MESSAGE), Toast.LENGTH_LONG).show();

            }

        }

    };

    private BroadcastReceiver passwordRequestedReceiver = new BroadcastReceiver() {

        @Override

        public void onReceive(Context context, Intent intent) {

            FragmentManager fm = getSupportFragmentManager();

            PasswordDialog passwordDialog = new PasswordDialog(intent.getStringExtra(Netplay.EXTRA_PLAYERNAME));

            passwordDialog.show(fm, "fragment_password_dialog");

        }

    };

    public void onNetConnectingStarted() {

    }