VolleyPractice
I wrote a series of articles to introduce this practice demo.
This series of articles introduce how to count api's duration and result's status code of the api; analysis source code of volley; custom GsonRequest by Gson and custom OkHttpStack by OkHttp.
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count api's duration and result's status code of the api
Use the class CustomStringRequest, and override the method -- onResponseTimeAndCode(long networkTimeMs, int statusCode), send a request.
you would receive api's duration and result's status code of the api in the method onResponseTimeAndCode(long networkTimeMs, int statusCode)
final String url = "http://gank.io/api/data/Android/10/1";
StringRequest request = new CustomStringRequest(Method.GET, url, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
Log.i("Volley", "onResponse " + response);
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.i("Volley", "onErrorResponse " + error);
}
}) {
@Override
protected void onResponseTimeAndCode(long networkTimeMs, int statusCode) {
Log.i("Volley", "api's url " + url);
Log.i("Volley", "api's networkTimeMs " + networkTimeMs);
Log.i("Volley", "api's statusCode " + statusCode);
}
};
RequestQueue queue = Volley.newRequestQueue(MainActivity.this);
queue.add(request);the source code of CustomStringRequest:
public class CustomStringRequest extends StringRequest {
private long mNetworkTimeMs = 0L;
public CustomStringRequest(int method, String url, Response.Listener<String> listener, Response.ErrorListener errorListener) {
super(method, url, listener, errorListener);
}
@Override
protected Response<String> parseNetworkResponse(NetworkResponse response) {
if (response != null) {
mNetworkTimeMs = response.networkTimeMs;
}
return super.parseNetworkResponse(response);
}
@Override
protected void deliverResponse(String response) {
super.deliverResponse(response);
if (mNetworkTimeMs > 0) {
this.onResponseTimeAndCode(mNetworkTimeMs, 1);
}
}
@Override
public void deliverError(VolleyError error) {
super.deliverError(error);
NetworkResponse response = error.networkResponse;
if (response != null) {
this.onResponseTimeAndCode(response.networkTimeMs, response.statusCode);
} else {
// Http 协议中 417 表示 Expectation Failed
this.onResponseTimeAndCode(error.getNetworkTimeMs(), 417);
}
}
/**
* 在子类中重写此方法，即可得到网络请求耗时和网络请求结果
*
* @param networkTimeMs 网络请求耗时，单位：毫秒
* @param statusCode 网络请求结果，成功则为1；失败则是具体的Http状态码，如404，500等(容易定位到请求失败的原因)
*/
protected void onResponseTimeAndCode(long networkTimeMs, int statusCode) {
}
}Other request, such as: JsonObjectRequest、JsonArrayRequest and ImageRequest, is similar, need to custom subclasses of these request.
Custom GsonRequest
How to use GsonRequest? It is easy.
GsonRequest<AndroidModel> request = new GsonRequest<AndroidModel>(mUrl,
new Response.Listener<AndroidModel>() {
@Override
public void onResponse(AndroidModel response) {
L.i("onResponse " + response.error);
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
L.i("onErrorResponse " + error);
}
}, AndroidModel.class);
RequestQueue queue = Volley.newRequestQueue(MainActivity.this.getApplicationContext());
queue.add(request);The source code of GsonRequest:
public class GsonRequest<T> extends Request<T> {
private Gson mGson = new Gson();
private Response.Listener<T> mListener = null;
private Class<T> mClass = null;
public GsonRequest(String url, Response.Listener<T> listener, Response.ErrorListener errorListener, Class<T> aClass) {
this(Method.GET, url, listener, errorListener, aClass);
}
public GsonRequest(int method, String url, Response.Listener<T> listener, Response.ErrorListener errorListener, Class<T> aClass) {
super(method, url, errorListener);
mListener = listener;
mClass = aClass;
}
@Override
protected Response<T> parseNetworkResponse(NetworkResponse response) {
try {
String res = new String(response.data, HttpHeaderParser.parseCharset(response.headers));
return Response.success(mGson.fromJson(res, mClass), HttpHeaderParser.parseCacheHeaders(response));
} catch (UnsupportedEncodingException e) {
return Response.error(new ParseError(e));
}
}
@Override
protected void deliverResponse(T response) {
if (mListener != null) {
mListener.onResponse(response);
}
}
}Custom OkHttpStack by OkHttp
How to use OkHttpStack?
RequestQueue queue = Volley.newRequestQueue(MainActivity.this,
new OkHttpStack(new OkHttpClient()));
StringRequest request = new StringRequest(mUrl, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
L.i("onResponse " + response);
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
L.i("onErrorResponse " + error);
}
});
queue.add(request);The source code of OkHttpStack:
public class OkHttpStack implements HttpStack {
private final OkHttpClient mOkHttpClient;
public OkHttpStack(OkHttpClient okHttpClient) {
if (okHttpClient == null) {
throw new IllegalArgumentException("OkHttpClient can't be null");
}
mOkHttpClient = okHttpClient;
}
@Override
public HttpResponse performRequest(Request<?> request, Map<String, String> additionalHeaders)
throws IOException, AuthFailureError {
// 设置超时时间
int timeoutMs = request.getTimeoutMs();
OkHttpClient okHttpClient = mOkHttpClient
.newBuilder()
.connectTimeout(timeoutMs, TimeUnit.MILLISECONDS)
.readTimeout(timeoutMs, TimeUnit.MILLISECONDS)
.writeTimeout(timeoutMs, TimeUnit.MILLISECONDS)
.build();
// 设置请求头
HashMap<String, String> headers = new HashMap<String, String>();
headers.putAll(request.getHeaders());
headers.putAll(additionalHeaders);
// 设置请求 url
okhttp3.Request.Builder builder = new okhttp3.Request
.Builder()
.url(request.getUrl());
for (String key : headers.keySet()) {
builder.header(key, headers.get(key));
}
// 设置请求方式和请求体
setConnectionParametersForRequest(builder, request);
// 通过 OkHttp3 进行网络请求得到 Response 类型的响应对象 okResponse
okhttp3.Request okRequest = builder.build();
Call call = okHttpClient.newCall(okRequest);
Response okResponse = call.execute();
// 根据 okResponse 对象生成 BasicStatusLine 对象
BasicStatusLine responseStatus = new BasicStatusLine(
parseProtocol(okResponse.protocol()),
okResponse.code(),
okResponse.message()
);
// 生成 BasicHttpResponse 对象 response，通过 {@link #entityFromOkHttpResponse(Response)}
// 方法生成 HttpEntity 对象，并设置给 response 对象
BasicHttpResponse response = new BasicHttpResponse(responseStatus);
response.setEntity(entityFromOkHttpResponse(okResponse));
// 向响应对象 response 中设置响应头
Headers responseHeaders = okResponse.headers();
int size = responseHeaders.size();
String name;
String value;
for (int i = 0; i < size; i++) {
name = responseHeaders.name(i);
value = responseHeaders.value(i);
if (value != null) {
response.addHeader(new BasicHeader(name, value));
}
}
return response;
}
/**
* 设置请求方式和请求体
*
* @param builder OkHttp3 通过 Build 设置请求方式和请求体
* @param request 请求对象 request
* @throws AuthFailureError
*/
private void setConnectionParametersForRequest(okhttp3.Request.Builder builder, Request<?> request)
throws AuthFailureError {
switch (request.getMethod()) {
case Request.Method.DEPRECATED_GET_OR_POST:
byte[] postBody = request.getPostBody();
if (postBody != null) {
builder.post(RequestBody.create(MediaType.parse(request.getPostBodyContentType()), postBody));
}
break;
case Request.Method.GET:
builder.get();
break;
case Request.Method.DELETE:
builder.delete();
break;
case Request.Method.POST:
builder.post(createRequestBody(request));
break;
case Request.Method.PUT:
builder.put(createRequestBody(request));
break;
case Request.Method.HEAD:
builder.head();
break;
case Request.Method.OPTIONS:
builder.method("OPTIONS", null);
break;
case Request.Method.TRACE:
builder.method("TRACE", null);
break;
case Request.Method.PATCH:
builder.patch(createRequestBody(request));
break;
default:
throw new IllegalStateException("Unknown method type.");
}
}
/**
* 根据请求对象 request 创建请求体
*
* @param r 请求对象
* @return OKHttp 所需要的请求体 RequestBody 对象
* @throws AuthFailureError
*/
private static RequestBody createRequestBody(Request<?> r) throws AuthFailureError {
final byte[] body = r.getBody();
if (body == null) return null;
return RequestBody.create(MediaType.parse(r.getBodyContentType()), body);
}
/**
* 根据不同的 Protocol 对象，生成对应的不同的 ProtocolVersion 对象
*
* @param p
* @return
*/
private static ProtocolVersion parseProtocol(final Protocol p) {
switch (p) {
case HTTP_1_0:
return new ProtocolVersion("HTTP", 1, 0);
case HTTP_1_1:
return new ProtocolVersion("HTTP", 1, 1);
case SPDY_3:
return new ProtocolVersion("SPDY", 3, 1);
case HTTP_2:
return new ProtocolVersion("HTTP", 2, 0);
}
throw new IllegalAccessError("Unkwown protocol");
}
/**
* 根据 OKHttp 响应中的 Response 对象，生成 HttpEntity 对象
*
* @param r OkHttp 的响应对象
* @return HttpEntity 对象
* @throws IOException
*/
private static HttpEntity entityFromOkHttpResponse(Response r) throws IOException {
BasicHttpEntity entity = new BasicHttpEntity();
ResponseBody body = r.body();
entity.setContent(body.byteStream());
entity.setContentLength(body.contentLength());
entity.setContentEncoding(r.header("Content-Encoding"));
if (body.contentType() != null) {
entity.setContentType(body.contentType().type());
}
return entity;
}
}