如何在单击项目时显示微调器

Question

我正在创建一个关注列表，例如this screen。

问题是，当我的活动开始时，它会自动选择位置零。我想限制微调器仅在用户单击列表中的任何项目时执行onclick侦听器。当我的活动开始时，它会自动显示Toast。您选择“关闭电源”但我没有单击任何项​​目，因此默认情况下如何停止选择微调器位置。

public class SpinnerActivity extends Activity { 
    // declare three arrays for content of spinner
    String[] strings = {"Power off","Restart"};

    String[] subs = {"Shut phone down","Close all apps and restart phone" };

    int arr_images[] = { R.drawable.pic1,
                         R.drawable.pic2};

    Button button; 
    TextView textview;  
    Spinner spinner;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_spinner); 
        button = (Button)findViewById(R.id.button1);
        textview = (TextView)findViewById(R.id.textView);
        spinner = (Spinner)findViewById(R.id.spinner1); 
        spinner.setAdapter(new MyAdapter(this, R.layout.row, strings));

        spinner.setOnItemSelectedListener(new  AdapterView.OnItemSelectedListener() { 
            public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) { 
                // TODO Auto-generated method stub
                Toast.makeText(SpinnerActivity.this,"You Selected 
                    :"+adapterView.getSelectedItem().toString(),Toast.LENGTH_SHORT).show();
            }

            // If no option selected
            public void onNothingSelected(AdapterView<?> arg0) {
                // TODO Auto-generated method stub
            } 
        });
    }

    // button onclick
    public void button_click(View view) {
        textview.setText(spinner.getSelectedItem().toString());
    }

    // Adapter class for spinner control
    public class MyAdapter extends ArrayAdapter<String>{
        public MyAdapter(Context context, int textViewResourceId, String[] objects) {
            super(context, textViewResourceId, objects);
        }

        @Override
        public View getDropDownView(int position, View convertView,ViewGroup parent) {
            return getCustomView(position, convertView, parent);
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            return getCustomView(position, convertView, parent);
        }

        public View getCustomView(int position, View convertView, ViewGroup parent) {

            LayoutInflater inflater=getLayoutInflater();
            View row=inflater.inflate(R.layout.row, parent, false);
            TextView label=(TextView)row.findViewById(R.id.company);
            label.setText(strings[position]);

            TextView sub=(TextView)row.findViewById(R.id.sub);
            sub.setText(subs[position]);

            ImageView icon=(ImageView)row.findViewById(R.id.image);
            icon.setImageResource(arr_images[position]); 
            return row;
        }
    }
}