android network to check

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

        ConnectivityManager manager = (ConnectivityManager) this.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo mobile = manager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
        NetworkInfo wifi = manager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);

        // wifi 또는 모바일 네트워크 어느 하나라도 연결이 되어있다면,
        if (wifi.isConnected() || mobile.isConnected()) {
            setContentView(R.layout.activity_main);

            Log.d(TAG,"dfdf");
            new miniloto().execute();

        } else {

            AlertDialog.Builder ad = new AlertDialog.Builder(MainActivity.this);
            {
                setContentView(R.layout.activity_main);
                Log.d(TAG,"afaf");


//                wtext4.setText("네트워크 통신 에러");
                ad.setTitle("Network Error!");
                ad.setMessage("Your Network is Somthing Wrong!!");
                ad.setPositiveButton("OK", new DialogInterface.OnClickListener() {

                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {
                        dialogInterface.dismiss();
                        wtext1.setText("Network Error!");
                        wtext2.setText("Please ON Wifi & ON Mobile Network");
                        wtext3.setText("");
                        wtext4.setText("");
                        wtext5.setText("");
                        wtext6.setText("If you To check your Miniloto Number ");


                       return;
                    }
                });
                Log.d(TAG,"afaf");
                ad.show();

            }
        }