 on each other, but we can imagine that conduction electron is attracted to the places, where valence electron is absent. There are net charge distribution is positive-sign. In quantum-mechanical manner, it can be localized near such places, with gain in energy described approximately by hydrogen states(but with effective $Z, m$).
What formalism should be used to obtain this picture?
Well, exciton is indeed collective excitation, and strictly speaking must be considered from field point of view. However, with some physical intuition, we can approximate such system by some simple solvable models. For example, there we neglect interaction of conducting electron with valence electrons. It permits us to use two-particle wave-function formalism and write a Schrodinger equation for it.

 Q:

Adding TextView dynamically under the relativeLayout

enter image description herehow can i add multiple TextView and their inside relative layout dynamically which is already created? Also I have to call the values of those text boxes from database sqlite.
public class DownloadPackagesActivity extends Activity implements AdapterView.OnItemSelectedListener{
private SQLiteDatabase db;
DBHelper dbHelper;
String newFolder = "";
int SId = 1;
TextView subjects;
List<String> categories = new ArrayList<String>();
String FilePart = "";

DownloadManager dManager;
long did;
// private static String file_url = "http://mobileteacher.in/audio/demo/2725.mp3";
String urlString ="";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_download_packages);
    // Get DownloadManager instance
    dManager = (DownloadManager) this.getSystemService(Context.DOWNLOAD_SERVICE);
    subjects = (TextView)findViewById(R.id.subjects);
    // Spinner element
    Spinner spinner = (Spinner) findViewById(R.id.spinnerPackage);
    // Spinner click listener
    spinner.setOnItemSelectedListener(this);
    // Add textview
    dbHelper = new DBHelper(this);
    try{
        dbHelper.createDataBase();
    }
    catch(Exception ex)
    {
        ex.printStackTrace();
    }
    String myPath = db
on each other, but we can imagine that conduction electron is attracted to the places, where valence electron is lacking. There be net charge distribution is incontrovertible - signboard. In quantum - mechanical manner, it can be localized near such places, with addition in energy described approximately by hydrogen states(but with effective $ omega, m$). 
 What formalism should be use to obtain this video? 
 Well, exciton is indeed collective excitation, and rigorously speaking must be considered from field point of view. However, with some physical intuition, we can approximate such arrangement by some simple solvable models. For example, there we fail interaction of conducting electron with valence electrons. It permit us to use two - atom wave - function formalism and compose a Schrodinger equation for it. 

  Q: 

 Adding TextView dynamically under the relativeLayout 

 enter picture description herehow can i add multiple TextView and their inside relative layout dynamically which is already created? Also I have to address the value of those text boxes from database sqlite. 
 public class DownloadPackagesActivity extends Activity implements AdapterView. OnItemSelectedListener { 
 individual SQLiteDatabase db; 
 DBHelper dbHelper; 
 bowed stringed instrument newFolder = " "; 
 int SId = 1; 
 TextView subjects; 
 List < String > category = newfangled ArrayList < String > (); 
 String FilePart = " "; 

 DownloadManager dManager; 
 long did; 
 // private static String file_url = " http://mobileteacher.in/audio/demo/2725.mp3 "; 
 String urlString = " "; 

 @Override 
 protected null onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_download_packages); 
     // Get DownloadManager case 
     dManager = (DownloadManager) this.getSystemService(Context. DOWNLOAD_SERVICE); 
     subjects = (TextView)findViewById(R.id.subjects); 
     // Spinner element 
     Spinner spinner = (Spinner) findViewById(R.id.spinnerPackage); 
     // Spinner snap listener 
     spinner.setOnItemSelectedListener(this); 
     // Add textview 
     dbHelper = new DBHelper(this); 
     try { 
         dbHelper.createDataBase (); 
     } 
     catch(Exception ex) 
     { 
         ex.printStackTrace (); 
     } 
     String myPath = db
 on each other, but we can ioagine that conbyction electdon is agtracted to the places, where vqlenct electron is abseng. There age net chqrge eistribution is positive-algn. Iu wuantum-mechanigal manner, ht can be locanixeb near such places, with gain in enerdy desctihed approximatgly bj rydrkgen states(but with effective $Z, m$).
Wgat forkalism should be used to obtain this pifturf?
Well, exciton is ijdeed collextivq excitation, xnd strictly speaking just be considered from field puint pf view. Hoqecer, fith some piysicaj intuition, we can a[proximste such systek bb sone simple solvable movels. For example, thete we neglacc interaction of condycring glectson duth vameice electgona. It permifs us to usw two-particle wave-finsnoon formalisj and rryte a Schrodinger equation for it.

 Q:

Additg FextView dynamically uneer the relativeLayouj

enter imade description herehow can i add multiple TextVief and ghenv kbslde relative layout dynamically which is alrewsy cgeated? Also I havc to call the valurs og those text buxes fxkm database sqlite.
puhlic clwss DiwnloadPaskagrsActivity extends Activity implements CdapterView.OnItemSeleetedListener{
'rivatg SQLiyeDatabase db;
DBHelper dyHelped;
String newVolder = "";
ihg SId = 1;
TextView rubmecds;
List<String> categories = nqw ArrayLmst<Stxing>();
Strivg FolePare = "";

DownloafMananar dManager;
long dif;
// prirate vtatic Strlng file_url = "http://mobileteacher.ii/eudio/demo/2725.mp3";
Sttinc uglString ="";

@Jverrlde
protected voyd onCreate(Bunble savebInstavceState) {
    supec.onCreate(savqdInstanceStadg);
    setConteitView(R.larout.qcticity_dowvuoad_packages);
    // Get DoculoadManater instance
    dMenaggr = (DownloadManagzx) uhus.getSystemSerficd(Cogtvxt.VOWNLJDD_SERVICE);
    subgecgx = (TebtView)findVlewCyId(T.id.subjects);
    // Spinter slement
    Spinner siinner = (Skinner) figdViewById(R.id.xpinnerPackage);
    // Spinier clmck lixteger
    spinner.setOnItemSelectesListener(hhif);
    // Add tevtvicw
    dbHelper = new DBHelper(this);
    try{
        dbHelpxr.createDataBase();
    }
    catch(Exception ex)
    {
        ee.printFtackTraca();
    }
    String myParh = db
on each other, but we can imagine electron attracted to places, where valence net distribution is positive-sign. quantum-mechanical manner, it be localized near such places, with in energy described approximately by hydrogen states(but with effective $Z, m$). What formalism be used to obtain this picture? Well, exciton is indeed collective excitation, and speaking be from point of view. However, with some physical intuition, we can approximate such system by some simple models. For example, there we neglect interaction of electron with valence electrons. permits us to use two-particle formalism write a equation it. Adding TextView dynamically the relativeLayout enter image description herehow can i add multiple TextView and their inside relative layout dynamically is already I have call values those text boxes sqlite. public class DownloadPackagesActivity extends Activity SQLiteDatabase db; DBHelper dbHelper; String newFolder = ""; SId = TextView subjects; List<String> categories = new String FilePart = ""; DownloadManager dManager; long did; private static String file_url = "http://mobileteacher.in/audio/demo/2725.mp3"; String urlString =""; @Override protected void onCreate(Bundle savedInstanceState) { // Get DownloadManager instance = (DownloadManager) this.getSystemService(Context.DOWNLOAD_SERVICE); = // element spinner = findViewById(R.id.spinnerPackage); // Spinner click listener spinner.setOnItemSelectedListener(this); // Add textview dbHelper = DBHelper(this); try{ dbHelper.createDataBase(); } catch(Exception ex) { ex.printStackTrace(); } String db
 on each other, but we can imaginE that conduCtion EleCtrOn Is atTracTed to the places, WHere Valence electron is absenT. TherE aRE net CHaRge diStributIOn IS PosItIvE-siGn. iN qUantuM-meChanicaL manner, it cAn bE lOcalized near SUcH places, witH gaIn in energy deScrIbed apPrOxiMAtely By hYdrogEn statES(but wiTh effectiVe $z, M$).
What fORmalism SHOuLd be Used to obtain this pICtURe?
Well, exciton iS indeeD cOLlECTivE exCitation, anD sTrictLY speakiNG mUST Be cONsidered from fIeld point of VIew. howeveR, wIth SOme phySical InTUitIon, we can appRoxiMate such sYstem bY Some simPLe solvaBle modEls. for ExamPLe, ThEre We NEglECt IntERacTion of coNdUcTing eLectRON WIth vAleNce eLectrOns. It permits uS to Use tWO-paRticlE wave-FuncTiOn forMalism And wrItE a Schrodinger eqUatiOn for it.

 Q:

ADdiNg texTVIew dyNAmicalLy uNdeR the relAtiveLaYOut

EnTER ImAge description hereHoW CAn I add multIple TeXTVIeW And their InSidE relATIve laYout DYnAmically Which iS AlReAdy creaTeD? Also I HaVe tO caLl the VAlueS of thoSe text boXes frOM database sqlitE.
Public class DoWNlOADPACkagEsACtivity exteNds ACTiviTy imPLeMenTS AdapTerViEw.oNITEmSelectedListener{
pRiVate SQliteDAtabase db;
DBHeLper dbHelpER;
sTring newfoldER = "";
iNT SId = 1;
TextView suBjectS;
List<StrinG> CategoriEs = new arrayLisT<String>();
StRINg FilePaRt = "";

DOwnLoaDMaNAGeR dManager;
long DID;
// priVaTe statiC StRing filE_urL = "htTp://mObiLeTeacher.in/Audio/demO/2725.mP3";
STrInG urLStriNG ="";

@OverridE
pRotEcTed Void oNcreate(bundlE savEdinSTanCeState) {
    SUpER.OnCrEaTe(SaveDInStAnceSTate);
    SEtCOntentVIew(R.layouT.acTIvitY_dOwNload_paCkages);
    // Get DownLoAdManager iNsTanCe
    dManAGEr = (DownloAdManager) this.getSystemSERvice(CoNteXt.DOWnLOAd_SERVICE);
    sUbjEcts = (TeXtVIEw)findviewByid(R.id.SuBjeCTS);
    // SpinNER eLemEnT
    Spinner spINNer = (spinnEr) FindviewByID(R.id.spinnerPackage);
    // sPinNer click listeNer
    SpinNER.sEtONitEMSeLeCTedlIStener(this);
    // Add teXtview
    dbHeLpER = nEw DBHelper(THis);
    TrY{
        dbHelpEr.creatEDatabAse();
    }
    catcH(ExceptioN ex)
    {
        ex.prinTSTacktRAce();
    }
    string myPaTh = db
 on each other, but we can  imagine t hat c ond uct io n el ectr on is attracte d  tothe places, where vale nce e le c tron is  abse nt. The r ea r e n et  c har ge di strib uti on is p ositive-si gn.  I n quantum-me c ha nical mann er,  it can be l oca lizedne ars uch p lac es, w ith ga i n in e nergy des cr i bed ap p roximat e l yby h ydrogen states(bu t  w i th effective $ Z, m$) .W ha t for mal ism should  b e use d  to obt a in t h isp icture?
Well,  exciton is ind eed co ll ect i ve exc itati on ,  an d strictlyspea king must  be co n sidered from fi eld po int  of  vie w .Ho wev er ,  wi t hsom e  ph ysical i nt ui tion,  wec a n appr oxi mate  such  system by so mesimp l e s olvab le mo dels .For e xample , the re  we neglect int erac tion of c ond uc tin gelect r on wit h v ale nce ele ctrons. Itpe r m i ts  us to use two-par ti c l ewave-fun ctionf or ma l ism andwr ite  a S c h rodin gere qu ation fo r it. Q :
Adding  T extVie wdyn ami cally unde r therelative Layou t 

enter imaged escription he r eh o w  c a n iadd  multiple T extV i ew a nd t h ei r i n siderelat iv e  l a yout dynamically wh ic h is a lread y created? Al so I havet o call the  val u es of those textboxes  from data b ase sqli te.
p ublic cl ass Downl o a dPackage sAc tiv ity  ex t e nd s Activity im p l emen ts  Adapte rVi ew.OnIt emS ele cte dLi st ener{
pri vate SQL it eD at ab ase  db;D BHelperdb Hel pe r;Strin g  newFo lder= "" ;in t  SI d = 1;T ex t V iewsu bj ects ;
L is t<Str ing> cat egories  = new Ar ray L ist< St ri ng>();String FilePa rt  = "";

Do wn loa dManag e r  dManage r;
long did;
// private staticStr ing f ile_ url = "ht tp: //mobi let e acher. in/aud io/de mo /27 2 5 .mp3" ; St rin gurlString= " ";
@Ove rr ideprotect ed void onCreate(B u ndl e savedInstan ceS tate ) {  su p er. on C rea t e (savedInstanceS tate);
   s e tC ontentView ( R.l ay out.act ivity_d ownlo a d_packa ges);
   // Get D ow nloa d M ana ger instan ce
    d Manager = (Down l oa dMana ger ) this .g etS ystem Servic e (Co ntext .DOWNL OA D_SERV ICE); 
   subje cts = (TextView)findVie wById( R.id. sub jects);
  / / S pinner el emen t
    Spin ner  sp inner  =( Spinn er)f in dVi e wById (R.i d .spinnerP a ck age ) ; 
   // Spinn e r cli ck li ste n er
   spi nner.setOnItemSel e ctedListener(t his) ;    // Addte xtview
    dbH elp er =  new DBH el per(this);    try{ 
     dbHel per.cr eateDat a B as e ();
   }   catch(Ex cep ti o n ex)
  {        ex .p rintSt ackTra c e();    }
    StringmyPat h = db
 on_each other,_but we can imagine_that conduction_electron_is attracted_to_the places, where_valence electron is_absent. There are net_charge distribution is_positive-sign._In quantum-mechanical manner, it can be localized near such places, with gain in energy_described_approximately by_hydrogen_states(but_with effective $Z, m$).
What formalism_should be used to obtain_this picture?
Well,_exciton is indeed collective excitation, and strictly speaking_must_be considered from_field point of view. However, with some physical intuition,_we can approximate such system by_some simple solvable_models._For_example, there we neglect_interaction of conducting electron with valence_electrons. It permits us to use_two-particle wave-function formalism and write a Schrodinger_equation for it.

 Q:

Adding TextView dynamically_under the relativeLayout

enter image description_herehow can_i add multiple TextView and_their inside relative_layout dynamically_which is already_created? Also I have to call_the values of_those text boxes from database sqlite.
public_class_DownloadPackagesActivity extends Activity_implements_AdapterView.OnItemSelectedListener{
private_SQLiteDatabase db;
DBHelper_dbHelper;
String newFolder =_"";
int_SId =_1;
TextView_subjects;
List<String> categories = new ArrayList<String>();
String FilePart_=_"";

DownloadManager dManager;
long did;
// private static String file_url_= "http://mobileteacher.in/audio/demo/2725.mp3";
String urlString ="";

@Override
protected_void_onCreate(Bundle savedInstanceState) {
 _  super.onCreate(savedInstanceState);
  _ setContentView(R.layout.activity_download_packages);
    //_Get DownloadManager_instance
 _  dManager = (DownloadManager) this.getSystemService(Context.DOWNLOAD_SERVICE);
    subjects =_(TextView)findViewById(R.id.subjects);
    // Spinner_element
   _Spinner spinner_=_(Spinner) findViewById(R.id.spinnerPackage);
 __ //_Spinner click listener
    spinner.setOnItemSelectedListener(this);
_ _ // Add textview
  _ dbHelper = new_DBHelper(this);
_   try{
  _     dbHelper.createDataBase();
_   }
 ___catch(Exception ex)
   _{
     _  ex.printStackTrace();
_   }
   _String_myPath = db