自定义Volley

public class MyVolley {
 
 private static MyVolley myVolley;
 
 public static MyVolley newMyVolley(){
  if(myVolley == null){
   myVolley = new MyVolley();
  }
  return myVolley;
 }

 private CallBack callBack;
 private StringRequest stringRequest;
 private Context context;
 
 //string get
 public void stringRequsetGet(Context context, String url, CallBack callBack){
  RequestQueue queue = Volley.newRequestQueue(context);
  this.callBack = callBack;
  stringRequest = new StringRequest(Request.Method.GET, url, stringListener, errorListener);
  queue.add(stringRequest);
 }
 
 //string post
 public void stringRequestpost(Context context, String url, final Map map, CallBack callBack){
  RequestQueue queue =Volley.newRequestQueue(context);
  this.callBack = callBack;
  stringRequest = new StringRequest(Request.Method.POST, url, stringListener, errorListener){
   @Override
   protected Map<String, String> getParams() throws AuthFailureError{
    return map;
   }
  };
  
 }
 
 //string Listener
 private Response.Listener<String> stringListener = new Response.Listener<String>() {
  @Override
  public void onResponse(String response) {
   // TODO Auto-generated method stub
   callBack.onStringSuccess(response);
  }
 };

 //string Listener
 private Response.ErrorListener errorListener =  new Response.ErrorListener() {
  @Override
  public void onErrorResponse(VolleyError error) {
   // TODO Auto-generated method stub
   callBack.onFailure(error);
  }
 };
 
 public interface CallBack{
  public void onStringSuccess(String reponse);
  public void onFailure(VolleyError error);
 }
}