使用 Volley 使用 JSONArray 发送 POST 请求

Sending a POST request with JSONArray using Volley

我想在 Android 中发送一个简单的 POST 请求,正文等于:

[
 {
  "value": 1
 }
]

我尝试在 Android 中使用 Volley 库,这是我的代码:

// the jsonArray that I want to POST    
String json = "[{\"value\": 1}]";
JSONArray jsonBody = null;
try {
     jsonBody = new JSONArray(json);
    } catch (JSONException e) {
                               e.printStackTrace();
                              }
final JSONArray finalJsonBody = jsonBody;

// starting the request
final RequestQueue queue = Volley.newRequestQueue(getApplicationContext());
JsonObjectRequest request = 
new JsonObjectRequest(com.android.volley.Request.Method.POST,"https://...",null,

new Response.Listener<JSONObject>() {

@Override
public void onResponse(JSONObject response) {
Log.d("mytag", "Response is: " + response);}},
new Response.ErrorListener() {

@Override
public void onErrorResponse(VolleyError error) {
Log.d("Mytag", "error");}}) {

@Override
protected  Map<String,String> getParams() {
// the problem is here...
return (Map<String, String>) finalJsonBody;
}

@Override
public Map<String, String> getHeaders() throws AuthFailureError  {
HashMap<String, String> params = new HashMap<String, String>();
// I put all my headers here like the following one : 
params.put("Content-Type", "application/json");                                    
return params;}};

queue.add(request);

问题是 getParams 方法只接受一个 Map 对象,因为我想发送一个 JSONArray。所以,我不得不使用强制转换,然后会产生错误...

我不知道该如何解决 谢谢

你可以参考我下面的示例代码:

更新你的 pastebin link:

因为服务器响应 JSONArray,所以我使用 JsonArrayRequest 而不是 JsonObjectRequest。无需再覆盖 getBody

        mTextView = (TextView) findViewById(R.id.textView);
        String url = "https://api.orange.com/datavenue/v1/datasources/2595aa553d3049f0b0f03fbaeaa7ddc7/streams/9fe5edb1c76e4968bdcc9c902010bc6c/values";
        RequestQueue requestQueue = Volley.newRequestQueue(this);
        final String jsonString = "[\n" +
                " {\n" +
                "  \"value\": 1\n" +
                " }\n" +
                "]";
        try {
            JSONArray jsonArray = new JSONArray(jsonString);
            JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(Request.Method.POST, url, jsonArray, new Response.Listener<JSONArray>() {
                @Override
                public void onResponse(JSONArray response) {
                    mTextView.setText(response.toString());
                }
            }, new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    mTextView.setText(error.toString());
                }
            }) {
                @Override
                public Map<String, String> getHeaders() throws AuthFailureError {
                    Map<String, String> headers = new HashMap<>();
                    headers.put("X-OAPI-Key","TQEEGSk8OgWlhteL8S8siKao2q6LIGdq");
                    headers.put("X-ISS-Key","2b2dd0d9dbb54ef79b7ee978532bc823");
                    return headers;
                }
            };
            requestQueue.add(jsonArrayRequest);
        } catch (JSONException e) {
            e.printStackTrace();
        }

我的代码适用于 Google 的官方 volley 库和 mcxiaoke 的库

如果你想使用Google的库,在你git克隆为Google文档后,复制android 文件夹从 \src\main\java\com(您克隆的 Volley 项目)到您项目的 \app\src\main\java\com,如下图所示:

build.gradle 应包含以下内容

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:23.0.1'
    compile 'com.google.code.gson:gson:2.3.1'    
}

如果你的项目使用了mcxiaoke的库,build.gradle会像下面这样(注意dependencies):

apply plugin: 'com.android.application'

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.0"

    defaultConfig {
        applicationId "com.example.samplevolley"
        minSdkVersion 16
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:23.0.0'
    compile 'com.mcxiaoke.volley:library:1.0.17'
    compile 'com.google.code.gson:gson:2.3'
}

我建议你创建2个新的示例项目,然后一个使用Google的库,另一个使用mcxiaoke的图书馆。

更新结束

        String url = "http://...";
        RequestQueue requestQueue = Volley.newRequestQueue(this);
        final String jsonString = "[\n" +
                " {\n" +
                "  \"value\": 1\n" +
                " }\n" +
                "]";
        JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.POST, url, null, new Response.Listener<JSONObject>() {
            @Override
            public void onResponse(JSONObject response) {
                // do something...
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                // do something...
            }
        }) {
            @Override
            public byte[] getBody() {
                try {
                    return jsonString.getBytes(PROTOCOL_CHARSET);
                } catch (UnsupportedEncodingException uee) {
                    VolleyLog.wtf("Unsupported Encoding while trying to get the bytes of %s using %s",
                            jsonString, PROTOCOL_CHARSET);
                    return null;
                }
            }
        };
        requestQueue.add(jsonObjectRequest);

服务器端网络服务收到的截图如下: