Volley之简单封装（1）

来源：互联网发布：学生请假软件编辑：程序博客网时间：2024/04/30 08:56

本文对Volley简单封装，本文只是记录volley的使用

主要实现加载视图与请求分开：

数据回调的class

public abstract class CallBack {    protected void onFail(int errCode,String errMsg) {        //TODO 请求失败处理        finish();    }    public abstract void onSuccess(JSONObject json) throws JSONException;    public void start(){    //开始请求，出现加载进度条    }    public void finish(){    //请求结束，隐藏进度条    }}

单例请求class：

public class HttpUtils {    private static HttpUtils ourInstance = new HttpUtils();    private RequestQueue requestQueue = Volley.newRequestQueue(App.app);    public static HttpUtils getInstance() {        return ourInstance;    }    private HttpUtils() {    }    //根据需求添加重载方法    public void Post( String url, final Map<String,String> map, final CallBack callBack) {        makeRequest(Request.Method.POST,url,map,callBack,null);    }    private void makeRequest(int method, String url, final Map<String,String> map,                            final CallBack callBack, Object tag){        if (callBack != null) {            callBack.start();        }        final StringRequest request = new StringRequest(method, url, new Response.Listener<String>() {            @Override            public void onResponse(String response) {                try {                    JSONObject object = new JSONObject(response);                    if (callBack != null) {                        int code = object.getInt("code");                        if (code == 0) {                            callBack.onSuccess(object);                              callBack.finish();                        }else                            callBack.onFail(null,code,object.getString("errMsg"));                    }                } catch (JSONException e) {                    callBack.onFail(null,-1,"读取服务器数据失败");                }            }        }, new Response.ErrorListener() {            @Override            public void onErrorResponse(VolleyError error) {                if (callBack!=null)                    callBack.onFail(null,-2,"请求服务器失败");            }        }) {            @Override            protected Map<String, String> getParams() throws AuthFailureError {                if (map != null)                    return map;                return super.getParams();            }        };        request.setRetryPolicy(new DefaultRetryPolicy(5000, DefaultRetryPolicy.DEFAULT_MAX_RETRIES,                DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));        if (tag!=null) {            request.setTag(tag);        }        requestQueue.add(request);    }    public void cancelRequest(@NotNull Object tag){        requestQueue.cancelAll(tag);    }    public static final class RequestBuilder{        private int method = Request.Method.POST;        private String url;        private Map<String,String> map;        private CallBack callBack;        private Object tag;        public void build(){            if (method == Request.Method.GET && map!=null){                url=url+"?";                for (String key:map.keySet()) {                    try {                        url=url+key+"="+ URLEncoder.encode(map.get(key),"UTF-8")+"&";                    } catch (UnsupportedEncodingException e) {                        e.printStackTrace();                    }                }                url = url.substring(0, url.length()-1);            }            HttpUtils.getInstance().makeRequest(method,url,map,callBack,tag);        }        public RequestBuilder bindMethod(int method){            this.method = method;            return this;        }        public RequestBuilder bindMap(Map<String,String> map){            this.map = map;            return this;        }        public RequestBuilder bindCallBack( CallBack callBack){            this.callBack = callBack;            return this;        }        public RequestBuilder bindTag( Object tag){            this.tag = tag;            return this;        }    }}

使用方式:

        new HttpUtils.RequestBuilder().bindMap(new HashMap<String, String>())                .bindTag("")                .bindCallBack(new CallBack() {                    @Override                    public void onSuccess(JSONObject json) throws JSONException {                    }                }).build();        //---------------或者下面这个方式-------------         HttpUtils.getInstance().Post("url", new HashMap<String, String>(), new CallBack() {            @Override            public void onSuccess(JSONObject json) throws JSONException {            }        });

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