android spinner setOnItemSelectedListener的问题

最近在学习android遇到了点问题，请教大侠们一下。
  在程序中我要监听spinner的选择事件，如下面代码，当spinner中的项为1的时候，即namearray=[]{"item1"},运行程序的时候就会出现异常，但当namearray的长度大约1的时候就不会，请教大侠们一下，这个问题该怎么解决。
public void InitNameSpinner() {
  Spinner spinner=(Spinner)findViewById(R.id.selApp);
  String[]namearray=new String[]{"item1","item2"};
  ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,namearray);  
                  adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);  
                  spinner.setAdapter(adapter);  
          spinner.setVisibility(View.VISIBLE);  
          spinner.setOnItemSelectedListener(sellistener);
 
   
} public OnItemSelectedListener sellistener=new OnItemSelectedListener(){ @Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
// TODO Auto-generated method stub

} @Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub

}};
异常信息
：10-31 06:52:44.493: E/AndroidRuntime(2097): FATAL EXCEPTION: main
10-31 06:52:44.493: E/AndroidRuntime(2097): java.lang.IndexOutOfBoundsException: Invalid index 1, size is 1
10-31 06:52:44.493: E/AndroidRuntime(2097):  at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:251)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at java.util.Arrays$ArrayList.get(Arrays.java:66)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at android.widget.ArrayAdapter.getItem(ArrayAdapter.java:337)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:390)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at android.widget.ArrayAdapter.getView(ArrayAdapter.java:362)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at android.widget.Spinner.makeAndAddView(Spinner.java:534)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at android.widget.Spinner.layout(Spinner.java:485)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at android.widget.Spinner.onLayout(Spinner.java:449)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at android.view.View.layout(View.java:13754)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at android.view.ViewGroup.layout(ViewGroup.java:4362)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1649)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at android.widget.LinearLayout.layoutHorizontal(LinearLayout.java:1638)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at android.widget.LinearLayout.onLayout(LinearLayout.java:1422)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at android.view.View.layout(View.java:13754)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at android.view.ViewGroup.layout(ViewGroup.java:4362)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1649)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1507)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at android.widget.LinearLayout.onLayout(LinearLayout.java:1420)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at android.view.View.layout(View.java:13754)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at android.view.ViewGroup.layout(ViewGroup.java:4362)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at android.view.View.layout(View.java:13754)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at android.view.ViewGroup.layout(ViewGroup.java:4362)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1649)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1507)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at android.widget.LinearLayout.onLayout(LinearLayout.java:1420)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at android.view.View.layout(View.java:13754)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at android.view.ViewGroup.layout(ViewGroup.java:4362)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at android.view.View.layout(View.java:13754)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at android.view.ViewGroup.layout(ViewGroup.java:4362)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:1866)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1687)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:998)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4212)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at android.view.Choreographer.doCallbacks(Choreographer.java:555)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at android.view.Choreographer.doFrame(Choreographer.java:525)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at android.os.Handler.handleCallback(Handler.java:615)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at android.os.Handler.dispatchMessage(Handler.java:92)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at android.os.Looper.loop(Looper.java:137)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at android.app.ActivityThread.main(ActivityThread.java:4745)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at java.lang.reflect.Method.invokeNative(Native Method)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at java.lang.reflect.Method.invoke(Method.java:511)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
10-31 06:52:44.493: E/AndroidRuntime(2097):  at dalvik.system.NativeStart.main(Native Method)