Access Spinner in Activity without define in Layout

Spinner spinner = new Spinner(this);
String option[]={"By Date","By Transaction ID","By Customer Phone"};
ArrayAdapter<String> spinnerArrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item,option);
spinnerArrayAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item );
spinner.setAdapter(spinnerArrayAdapter);
spinner.performClick();
spinner.setOnItemSelectedListener(new OnItemSelectedListener() {

    @Override
    public void onItemSelected(AdapterView<?> parentview, View v,int position, long id)
    {
        Log.d("in select","yes");
    }

    @Override
    public void onNothingSelected(AdapterView<?> arg0) 
    {
        Toast.makeText(MainMenu.this,"no",Toast.LENGTH_LONG).show();
        Log.d("In No select","No");
    }
});

This all are done very fine, a new pop up display of Spinner view is genera开发者_如何学Cte on the previous view and previous view still display but dim, all focus on this current Spinner

But the problem is when I select any item in this spinner then onItemSelected() should be called but it is not called.

but if I write

setContentView(spinner);

then onItemSelected() is called, but then previous view is not displayed now.

so how can i access spinner without this line setContentView(spinner);

I want to get the position of the selected Item in Spinner

Please provide me code or example

i am waiting for your kind reply

You must bind your spinner to your Layout, if you don't wont to use setContentView(spinner);. Use something like this at the end of your code

LinearLayout line = (LinearLayout) findViewById(R.id.line);
line.addView(spinner);

and your Layout is

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/line">
</LinearLayout>