/*post请求*/
public void dostringVolleypost(){
    /*第一步，创建请求队列*/
    queue = Volley.newRequestQueue(this);
    /*第二步，创建请求对象*/
    StringRequest stringRequest = new StringRequest(
            Request.Method.POST,           //当改成post方法时：Request.Method.POST
            "http://apis.baidu.com/txapi/tiyu/tiyu?num=10",
            new Response.Listener<String>() {

                @Override
                public void onResponse(String response) {
                    String s = response;
                    webView.getSettings().setJavaScriptEnabled(true);
                    webView.getSettings().setDefaultTextEncodingName("UTF-8");
                    webView.loadDataWithBaseURL(null,s,"text/html","UTF-8",null);
                }
            },
            new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    webView.loadDataWithBaseURL(null,"网络请求失败","text/html","UTF-8",null);
                }
            }
    ){   //通过匿名内部类的方式实现post方法存储参数，其它的与get方法相同
        @Override
        protected Map<String, String> getParams() throws AuthFailureError {
            Map<String,String> map = new HashMap<String, String>();
            map.put("name","ZhangSan");
            map.put("pwd","123456");
            return map;
        }

        /*getHeaders匿名内部类，获取头部，即获取apikey，对get方法和post方法都适用*/
        @Override
        public Map<String, String> getHeaders() throws AuthFailureError {
            Map<String,String> map = new HashMap<String, String>();
            map.put("apikey","96c52acc3831b95cf4a5c6f0e23ea209");
            return map;
        }
        /*重写方法，完成转码*/
        @Override
        protected Response<String> parseNetworkResponse(
                NetworkResponse response) {
            try {
                String jsonObject = new String(new String(response.data, "UTF-8"));
                return Response.success(jsonObject, HttpHeaderParser.parseCacheHeaders(response));
            } catch (UnsupportedEncodingException e) {
                return Response.error(new ParseError(e));
            } catch (Exception je) {
                return Response.error(new ParseError(je));
            }
        }
        /*设置当前请求的优先级*/
        @Override
        public Priority getPriority() {
            return Priority.HIGH;
        }
    };
    stringRequest.setTag("post");
    /*第三步，把请求对象放在请求队列*/
    queue.add(stringRequest);
}

@Override
protected void onStop() {
    super.onStop();
    queue.cancelAll("get");/*取消当前队列里的Tag为get的请求*/
    queue.cancelAll(this);/*取消当前队列里的所有网络请求*/
}