android - Spinner not getting populated with the given string array -

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i have make android app. counting bunks college students. want make this:

spinner 1 has

select branch

  1. me
  2. ce
  3. it
  4. ee

select semester

1st
2nd
3rd
4th

etc.

now if student selecting me , 3rd semester, 3rd semester subjects should come like:

enter bunks of subject:

abc1: edittext
abc2: edittext
abc3: edittext
abc4: edittext
abc4: edittext

and input user should come logic of percentage of attendance, , answers should come on page same subject name.

can me please?

edit

my main.xml:

<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <textview  android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" /> <spinner android:id="@+id/spinner1" android:layout_width="fill_parent" android:layout_height="wrap_content" /> </linearlayout>

xml spinner: 

<spinner android:id="@+id/city_spinner_iwant" android:layout_width="fill_parent" android:layout_height="wrap_content" android:prompt="@string/cityspinner" android:textcolor="@color/white" android:textsize="20dp" />

in code, set adapter populate spinner requires items (in case branches):

string[] city_array = new string[]{"london", "newyork", "paris"};  arrayadapter<string> cityarrayadapter = new arrayadapter<string>(this,android.r.layout.simple_spinner_item,city_array);  city_spinner = (spinner) findviewbyid(r.id.city_spinner_iwant); city_spinner.setadapter(cityarrayadapter);

then show forms depending on item selected in spinner:

city_spinner.setonitemselectedlistener(new adapterview.onitemselectedlistener() {  public void onitemselected(adapterview<?> adapter, view v,int i, long lng) {  selected_city = adapter.getitematposition(i).tostring(); toast.maketext(getapplicationcontext(), selected_city, 1000).show();  //conditions depending on selected_city (in case selected branch) } public void onnothingselected(adapterview<?> arg0) {  //no need impement } });

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