我看到关于Volley的Google IO 2013会话，我正在考虑转向凌空。 Volley是否支持添加POST / GET参数来请求？如果是，我该怎么做？
答案 0 :(得分：73)
对于GET参数，有两种选择：
首先：正如评论中所建议的那样，您可以使用String并将参数占位符替换为以下值：
String uri = String.format("http://somesite.com/some_endpoint.php?param1=%1$s¶m2=%2$s",
num1,
num2);
StringRequest myReq = new StringRequest(Method.GET,
uri,
createMyReqSuccessListener(),
createMyReqErrorListener());
queue.add(myReq);
其中num1和num2是包含您的值的String变量。
第二：如果您使用newer external HttpClient（例如4.2.x），您可以使用URIBuilder构建您的Uri。优点是，如果您的uri字符串中已包含参数，则可以更轻松地将其传递给URIBuilder，然后使用ub.setQuery(URLEncodedUtils.format(getGetParams(), "UTF-8"));添加其他参数。这样你就不用费心去检查“？”已添加到uri或错过了一些＆amp;从而消除了潜在错误的来源。
对于POST参数有时可能比接受的答案更容易：
StringRequest myReq = new StringRequest(Method.POST,
"http://somesite.com/some_endpoint.php",
createMyReqSuccessListener(),
createMyReqErrorListener()) {
protected Map<String, String> getParams() throws com.android.volley.AuthFailureError {
Map<String, String> params = new HashMap<String, String>();
params.put("param1", num1);
params.put("param2", num2);
return params;
};
};
queue.add(myReq);
e.g。只是覆盖getParams()方法。
您可以在Andorid Volley Examples project中找到一个有效的示例（以及许多其他基本的Volley示例）。
答案 1 :(得分：61)
在Request类（扩展Request）中，重写getParams（）方法。您可以对标题执行相同操作，只需覆盖getHeaders（）。
如果你在Volley测试中查看TestRequest.java中的PostWithBody类，你会找到一个例子。 它就是这样的
public class LoginRequest extends Request<String> {
// ... other methods go here
private Map<String, String> mParams;
public LoginRequest(String param1, String param2, Listener<String> listener, ErrorListener errorListener) {
super(Method.POST, "http://test.url", errorListener);
mListener = listener;
mParams = new HashMap<String, String>();
mParams.put("paramOne", param1);
mParams.put("paramTwo", param2);
}
@Override
public Map<String, String> getParams() {
return mParams;
}
}
Evan Charlton非常友好地制作了一个快速示例项目，向我们展示如何使用凌空。 https://github.com/evancharlton/folly/
答案 2 :(得分：21)
CustomRequest是一种解决Volley的方法JSONObjectRequest无法发布像StringRequest
这里是帮助类，它允许添加参数：
import java.io.UnsupportedEncodingException;
import java.util.Map;
import org.json.JSONException;
import org.json.JSONObject;
import com.android.volley.NetworkResponse;
import com.android.volley.ParseError;
import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.Response.ErrorListener;
import com.android.volley.Response.Listener;
import com.android.volley.toolbox.HttpHeaderParser;
public class CustomRequest extends Request<JSONObject> {
private Listener<JSONObject> listener;
private Map<String, String> params;
public CustomRequest(String url, Map<String, String> params,
Listener<JSONObject> reponseListener, ErrorListener errorListener) {
super(Method.GET, url, errorListener);
this.listener = reponseListener;
this.params = params;
}
public CustomRequest(int method, String url, Map<String, String> params,
Listener<JSONObject> reponseListener, ErrorListener errorListener) {
super(method, url, errorListener);
this.listener = reponseListener;
this.params = params;
}
protected Map<String, String> getParams()
throws com.android.volley.AuthFailureError {
return params;
};
@Override
protected Response<JSONObject> parseNetworkResponse(NetworkResponse response) {
try {
String jsonString = new String(response.data,
HttpHeaderParser.parseCharset(response.headers));
return Response.success(new JSONObject(jsonString),
HttpHeaderParser.parseCacheHeaders(response));
} catch (UnsupportedEncodingException e) {
return Response.error(new ParseError(e));
} catch (JSONException je) {
return Response.error(new ParseError(je));
}
}
@Override
protected void deliverResponse(JSONObject response) {
// TODO Auto-generated method stub
listener.onResponse(response);
}
}
答案 3 :(得分：9)
此帮助程序类管理 GET 和 POST 请求的参数：
import java.io.UnsupportedEncodingException;
import java.util.Iterator;
import java.util.Map;
import org.json.JSONException;
import org.json.JSONObject;
import com.android.volley.NetworkResponse;
import com.android.volley.ParseError;
import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.Response.ErrorListener;
import com.android.volley.Response.Listener;
import com.android.volley.toolbox.HttpHeaderParser;
public class CustomRequest extends Request<JSONObject> {
private int mMethod;
private String mUrl;
private Map<String, String> mParams;
private Listener<JSONObject> mListener;
public CustomRequest(int method, String url, Map<String, String> params,
Listener<JSONObject> reponseListener, ErrorListener errorListener) {
super(method, url, errorListener);
this.mMethod = method;
this.mUrl = url;
this.mParams = params;
this.mListener = reponseListener;
}
@Override
public String getUrl() {
if(mMethod == Request.Method.GET) {
if(mParams != null) {
StringBuilder stringBuilder = new StringBuilder(mUrl);
Iterator<Map.Entry<String, String>> iterator = mParams.entrySet().iterator();
int i = 1;
while (iterator.hasNext()) {
Map.Entry<String, String> entry = iterator.next();
if (i == 1) {
stringBuilder.append("?" + entry.getKey() + "=" + entry.getValue());
} else {
stringBuilder.append("&" + entry.getKey() + "=" + entry.getValue());
}
iterator.remove(); // avoids a ConcurrentModificationException
i++;
}
mUrl = stringBuilder.toString();
}
}
return mUrl;
}
@Override
protected Map<String, String> getParams()
throws com.android.volley.AuthFailureError {
return mParams;
};
@Override
protected Response<JSONObject> parseNetworkResponse(NetworkResponse response) {
try {
String jsonString = new String(response.data,
HttpHeaderParser.parseCharset(response.headers));
return Response.success(new JSONObject(jsonString),
HttpHeaderParser.parseCacheHeaders(response));
} catch (UnsupportedEncodingException e) {
return Response.error(new ParseError(e));
} catch (JSONException je) {
return Response.error(new ParseError(je));
}
}
@Override
protected void deliverResponse(JSONObject response) {
// TODO Auto-generated method stub
mListener.onResponse(response);
}
}
答案 4 :(得分：6)
处理 GET 参数我迭代Andrea Motto＆＃39;解。
问题是Volley多次调用GetUrl，他的解决方案使用Iterator破坏了原始的Map对象。随后的Volley内部调用有一个空的params对象。
我还添加了参数编码。
这是一个内联用法（没有子类）。
public void GET(String url, Map<String, String> params, Response.Listener<String> response_listener, Response.ErrorListener error_listener, String API_KEY, String stringRequestTag) {
final Map<String, String> mParams = params;
final String mAPI_KEY = API_KEY;
final String mUrl = url;
StringRequest stringRequest = new StringRequest(
Request.Method.GET,
mUrl,
response_listener,
error_listener
) {
@Override
protected Map<String, String> getParams() {
return mParams;
}
@Override
public String getUrl() {
StringBuilder stringBuilder = new StringBuilder(mUrl);
int i = 1;
for (Map.Entry<String,String> entry: mParams.entrySet()) {
String key;
String value;
try {
key = URLEncoder.encode(entry.getKey(), "UTF-8");
value = URLEncoder.encode(entry.getValue(), "UTF-8");
if(i == 1) {
stringBuilder.append("?" + key + "=" + value);
} else {
stringBuilder.append("&" + key + "=" + value);
}
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
i++;
}
String url = stringBuilder.toString();
return url;
}
@Override
public Map<String, String> getHeaders() {
Map<String, String> headers = new HashMap<>();
if (!(mAPI_KEY.equals(""))) {
headers.put("X-API-KEY", mAPI_KEY);
}
return headers;
}
};
if (stringRequestTag != null) {
stringRequest.setTag(stringRequestTag);
}
mRequestQueue.add(stringRequest);
}
此函数使用标头传递APIKEY并将TAG设置为在完成之前取消它的有用请求。
希望这有帮助。
答案 5 :(得分：3)
这可能对你有所帮助......
private void loggedInToMainPage(final String emailName, final String passwordName) {
String tag_string_req = "req_login";
StringRequest stringRequest = new StringRequest(Request.Method.POST, "http://localhost/index", new Response.Listener<String>() {
@Override
public void onResponse(String response) {
Log.d(TAG, "Login Response: " + response.toString());
try {
JSONObject jsonObject = new JSONObject(response);
Boolean error = jsonObject.getBoolean("error");
if (!error) {
String uid = jsonObject.getString("uid");
JSONObject user = jsonObject.getJSONObject("user");
String email = user.getString("email");
String password = user.getString("password");
session.setLogin(true);
Intent intent = new Intent(getApplicationContext(), MainActivity.class);
startActivity(intent);
finish();
Toast.makeText(getApplicationContext(), "its ok", Toast.LENGTH_SHORT).show();
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError volleyError) {
System.out.println("volley Error .................");
}
}) {
@Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> params = new HashMap<String, String>();
params.put("tag", "login");
params.put("email", emailName);
params.put("password", passwordName);
return params;
}
};
MyApplication.getInstance().addToRequestQueue(stringRequest,tag_string_req);
}
答案 6 :(得分：2)
我喜欢与Volley合作。为了节省开发时间，我尝试编写一个小方便的库Gloxey Netwok Manager来设置我的项目Volley。它包括JSON解析器和有助于检查网络可用性的其他不同方法。
使用ConnectionManager.class，其中排球字符串和排球JSON 请求的不同方法可用。
您可以在有或没有标题的情况下发出 GET，PUT，POST，DELETE 的请求。您可以阅读完整文档here。
只需将此行放入您的gradle文件中即可。
dependencies {
compile 'io.gloxey.gnm:network-manager:1.0.1'
}
方法GET（不带标题）
ConnectionManager.volleyStringRequest(context, isDialog, progressDialogView, requestURL, volleyResponseInterface);
Configuration Description
Context Context
isDialog If true dialog will appear, otherwise not.
progressView For custom progress view supply your progress view id and make isDialog true. otherwise pass null.
requestURL Pass your API URL.
volleyResponseInterface Callback for response.
示例
ConnectionManager.volleyStringRequest(this, false, null, "url", new VolleyResponse() {
@Override
public void onResponse(String _response) {
/**
* Handle Response
*/
}
@Override
public void onErrorResponse(VolleyError error) {
/**
* handle Volley Error
*/
}
@Override
public void isNetwork(boolean connected) {
/**
* True if internet is connected otherwise false
*/
}
});
方法POST / PUT / DELETE（不带标题）
ConnectionManager.volleyStringRequest(context, isDialog, progressDialogView, requestURL, requestMethod, params, volleyResponseInterface);
示例
Use Method : Request.Method.POST
Request.Method.PUT
Request.Method.DELETE
Your params :
HashMap<String, String> params = new HashMap<>();
params.put("param 1", "value");
params.put("param 2", "value");
ConnectionManager.volleyStringRequest(this, true, null, "url", Request.Method.POST, params, new VolleyResponse() {
@Override
public void onResponse(String _response) {
/**
* Handle Response
*/
}
@Override
public void onErrorResponse(VolleyError error) {
/**
* handle Volley Error
*/
}
@Override
public void isNetwork(boolean connected) {
/**
* True if internet is connected otherwise false
*/
}
});
随意使用gloxey json解析器来解析你的api响应。
YourModel yourModel = GloxeyJsonParser.getInstance().parse(stringResponse, YourModel.class);
示例
ConnectionManager.volleyStringRequest(this, false, null, "url", new VolleyResponse() {
@Override
public void onResponse(String _response) {
/**
* Handle Response
*/
try {
YourModel yourModel = GloxeyJsonParser.getInstance().parse(_response, YourModel.class);
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public void onErrorResponse(VolleyError error) {
/**
* handle Volley Error
*/
if (error instanceof TimeoutError || error instanceof NoConnectionError) {
showSnackBar(parentLayout, getString(R.string.internet_not_found), getString(R.string.retry), new View.OnClickListener() {
@Override
public void onClick(View view) {
//handle retry button
}
});
} else if (error instanceof AuthFailureError) {
} else if (error instanceof ServerError) {
} else if (error instanceof NetworkError) {
} else if (error instanceof ParseError) {
}
}
@Override
public void isNetwork(boolean connected) {
/**
* True if internet is connected otherwise false
*/
if (!connected) {
showSnackBar(parentLayout, getString(R.string.internet_not_found), getString(R.string.retry), new View.OnClickListener() {
@Override
public void onClick(View view) {
//Handle retry button
}
});
}
});
public void showSnackBar(View view, String message) {
Snackbar.make(view, message, Snackbar.LENGTH_LONG).show();
}
public void showSnackBar(View view, String message, String actionText, View.OnClickListener onClickListener) {
Snackbar.make(view, message, Snackbar.LENGTH_LONG).setAction(actionText, onClickListener).show();
}
答案 7 :(得分：0)
要提供POST参数，请将参数JSONObject发送到JsonObjectRequest构造函数。第3个参数接受请求正文中使用的JSONObject。
JSONObject paramJson = new JSONObject();
paramJson.put("key1", "value1");
paramJson.put("key2", "value2");
JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.POST,url,paramJson,
new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}
});
requestQueue.add(jsonObjectRequest);