Spinner

    <string-array name="spingarr">
        <item>支付宝</item>
        <item>微信</item>
    </string-array>

        <Spinner
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:entries="@array/spingarr"
            android:id="@+id/payMode"
            android:layout_weight="1">
        </Spinner>

        private Spinner payMode;
        private int payNum;
        private String strPay;


        payMode = (Spinner)findViewById(R.id.payMode);
        payMode.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                 strPay = (String)payMode.getSelectedItem();
            }
        });

       if(strPay.equals("支付宝")){
           payNum = 0;
        }else if (strPay.equals("微信")){
            payNum = 1;
        }    

        payMode = (Spinner) findViewById(R.id.payMode);
    
        //数据
        data_list = new ArrayList<String>();
        data_list.add("微信");
        data_list.add("支付宝");
//适配器
        arr_adapter= new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, data_list);
        //设置样式
        arr_adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        //加载适配器
        spinner.setAdapter(arr_adapter);