title: Android: problems with getSelectedItem on a spinner
body: <p>I have  a <code>Spinner</code>, and put the selected item in the body of a mail.
  this is my code:</p>
  
  <pre><code>@Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_modulo);
  
      Spinner spinnerTaglia = (Spinner) findViewById(R.id.spinnerTaglia);
  
  // Create an ArrayAdapter using the string array and a default spinner layout ArrayAdapter&lt;CharSequence&gt; adapter = ArrayAdapter.createFromResource(this,     R.array.Taglie, android.R.layout.simple_spinner_item);
  
  // Specify the layout to use when the list of choices appears adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
      spinnerTaglia.setPrompt("Seleziona la taglia!");
  
  // Apply the adapter to the spinner
      spinnerTaglia.setAdapter(new NothingSelectedSpinnerAdapter(
              adapter,
              R.layout.contact_spinner_row_nothing_selected,
              // R.layout.contact_spinner_nothing_selected_dropdown, // Optional
              this));
  
      final String taglia = spinnerTaglia.getSelectedItem().toString();
  
  
      Button btnCompilaOrdine = (Button) findViewById(R.id.btnCompilaOrdine);
      btnCompilaOrdine.setOnClickListener(new View.OnClickListener(){
  
          public void onClick(View arg0) {
  
      Intent i = new Intent(Intent.ACTION_SEND);
      i.setType("message/rfc822");
      i.putExtra(Intent.EXTRA_EMAIL  , new String[]{"MAIL@gmail.com"});
      i.putExtra(Intent.EXTRA_SUBJECT, "MAIL OBJECT");
      i.putExtra(Intent.EXTRA_TEXT   , "Taglia: "+taglia);
      try {
          startActivity(Intent.createChooser(i, "Send mail..."));
      } catch (android.content.ActivityNotFoundException ex) {
          Toast.makeText(Modulo.this, "There are no email clients installed.", Toast.LENGTH_SHORT).show();
      }
  
      }
      });
  }
  </code></pre>
  
  <p>The application start correctly in the emulator and the debugger show me nothing (I'm using Android Studio) but when i click on the button that take me in this activity the application crash and the Android Studio's Debugger show me a <code>java.lang.NullPointerException</code> in the row:</p>
  
  <p>final String taglia = spinnerTaglia.getSelectedItem().toString();</p>
  
  <p>how can i fix this?</p>