在使用Android Volley请求时,我在从Microsoft自定义视觉API(光学字符识别API)获取JSON响应方面遇到了一些问题。
我已经将此方法与其他API一起使用而没有任何问题,但对于此API,我无法使其工作。
String URL = "https://westcentralus.api.cognitive.microsoft.com/vision/v1.0/ocr";
final ProgressDialog pDialog = new ProgressDialog(this);
pDialog.setMessage("Getting License plate...");
pDialog.setCancelable(false);
pDialog.show();
try {
RequestQueue requestQueue = Volley.newRequestQueue(this);
JSONObject jsonBody = new JSONObject();
jsonBody.put("url", "https://upload.wikimedia.org/wikipedia/commons/thumb/a/af/Atomist_quote_from_Democritus.png/338px-Atomist_quote_from_Democritus.png");
final String requestBody = jsonBody.toString();
StringRequest stringRequest = new StringRequest(Request.Method.POST, URL, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
pDialog.hide();
Log.i("VOLLEY", response);
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.e("VOLLEY", error.toString());
}
}) {
@Override
public byte[] getBody() throws AuthFailureError {
try {
return requestBody == null ? null : requestBody.getBytes("utf-8");
} catch (UnsupportedEncodingException uee) {
VolleyLog.wtf("Unsupported Encoding while trying to get the bytes of %s using %s", requestBody, "utf-8");
return null;
}
}
@Override
public Map<String, String> getHeaders() throws AuthFailureError {
HashMap<String, String> headers = new HashMap<>();
headers.put("Content-Type", "application/json");
headers.put("Ocp-Apim-Subscription-Key", "123124123123123123213");
return headers;
}
};
requestQueue.add(stringRequest);
} catch (JSONException e) {
e.printStackTrace();
}
我收到了这个回复:
E/Volley: [2163] BasicNetwork.performRequest: Unexpected response code 400 for https://westcentralus.api.cognitive.microsoft.com/vision/v1.0/ocr
使用邮递员时,我没有收到任何错误。
希望你能看到我做错了什么。 如果您希望我详细说明,请告诉我。
谢谢!
答案 0 :(得分:1)
您必须将StringRequest
替换为JsonObjectRequest
并删除Content-type
标题。
这对我有用:
final JSONObject jsonBody = new JSONObject();
jsonBody.put("url", "https://pbs.twimg.com/profile_images/808958766628605952/yB14UlXl_400x400.jpg");
JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.POST, URL, jsonBody,
new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
System.out.println(response.toString());
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
String readableError = "";
try {
readableError = new String(error.networkResponse.data, "utf-8");
System.out.println(readableError);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}
}) {
@Override
public Map<String, String> getHeaders() throws AuthFailureError {
HashMap<String, String> headers = new HashMap<>();
headers.put("Ocp-Apim-Subscription-Key", "XXXXXXXX");
return headers;
}
};
答案 1 :(得分:1)
是由于上传的图片太大造成的。 Api只返回400,没有任何解释。
ImageHelper类具有调整图像大小的代码