我正在尝试使用包含json主体的Volley发送POST请求我注意到这个库在S.O上有其他相关问题但是没有适当地解决我的特定用例。我和我的团队尝试了不同的变通方法，但没有成功。
我尝试了所提供代码的不同变体，并且在发送正文中包含的内容的上下文中无法获得任何工作。我试图做的是（1）帖子中的帖子（2）在该帖子中包含一个base64。我应该提一下端点，在这种情况下，正在工作并已经通过网络拦截器进行确认以及查看后端，这确实在身体中没有发送任何数据。
public class MainActivity extends AppCompatActivity {
private TextView mTextMessage;
private Uri capturedImageUri = null;
static final int REQUEST_IMAGE_CAPTURE = 1;
private ImageView imageView;
final Context context = this;
private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener
= new BottomNavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.navigation_home:
mTextMessage.setText(R.string.title_home);
return true;
case R.id.navigation_dashboard:
mTextMessage.setText(R.string.title_dashboard);
return true;
case R.id.navigation_notifications:
mTextMessage.setText(R.string.title_notifications);
return true;
}
return false;
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// mTextMessage = (TextView) findViewById(R.id.message);
BottomNavigationView navigation = (BottomNavigationView) findViewById(R.id.navigation);
navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);
Button btnCamera = (Button) findViewById(R.id.btnCamera);
imageView = (ImageView) findViewById(R.id.imageView);
btnCamera.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(intent, REQUEST_IMAGE_CAPTURE);
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
Bundle extras = data.getExtras();
Bitmap photo = (Bitmap) extras.get("data");
imageView.setImageBitmap(photo);
String convertedIMG = convertImage(photo);
sendToRemote(convertedIMG);
} else {
Toast.makeText(MainActivity.this, "Could Not Capture Image, Please Try Again.", Toast.LENGTH_LONG).show();
}
}
private String sendToRemote(String sendImage) {
String url = "localhost:3000/medicalImage";
try {
RequestQueue queue = Volley.newRequestQueue(MainActivity.this);
StringRequest stringRequest = new StringRequest(Request.Method.POST, url,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
Log.d("Response: >", response); /// put this on the UI wil contain the percentage of accuracy if positive
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
// imageView.setVisibility(View.GONE);
Log.d("network", "=========>", error);
error.printStackTrace();
Toast.makeText(MainActivity.this, "Error Submitting Image", Toast.LENGTH_LONG).show();
}
});
// Add the request to the RequestQueue.
queue.add(stringRequest);
} catch (Exception error) {
error.printStackTrace();
}
return "";
}
private String convertImage(Bitmap photo) {
ByteArrayOutputStream out = new ByteArrayOutputStream();
photo.compress(Bitmap.CompressFormat.JPEG, 100, out);
byte[] b = out.toByteArray();
return Base64.encodeToString(b, Base64.DEFAULT);
}
}
我们使用的代码------------------------------------------- ------------
private void sendToRemote(final String sendImage) {
String url = "url";
try {
JSONObject jsonBody = new JSONObject();
jsonBody.put("Image", sendImage);
requestBody = jsonBody.toString();
StringRequest stringRequest = new StringRequest(Request.Method.POST, url,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
// Log.d("Response: >", response);
Toast.makeText(MainActivity.this, "Prediction "
+ response, Toast.LENGTH_LONG).show(); // returns percent of assumption
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
//Log.d("network", "=========>", error);
error.printStackTrace();
Toast.makeText(MainActivity.this, "Error Submitting Image", Toast.LENGTH_LONG).show();
}
}) {
@Override
public String getBodyContentType() {
return String.format("application/json; charset=utf-8");
}
@Override
public byte[] getBody() throws AuthFailureError {
try {
return requestBody == null ? null : requestBody.getBytes("utf-8");
} catch (UnsupportedEncodingException uee) {
return null;
}
}
};
RequestQueue queue = Volley.newRequestQueue(MainActivity.this);
queue.add(stringRequest);
} catch (Exception error) {
Toast.makeText(MainActivity.this, "Unexpected Network Error", Toast.LENGTH_LONG).show();
error.printStackTrace();
}
}
答案 0 :(得分：0)
要添加参数，您必须覆盖getParams（），如下所示：
StringRequest stringRequest = new StringRequest(Request.Method.POST, url,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
Log.d("Response: >", response); /// put this on the UI wil contain the percentage of accuracy if positive
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
// imageView.setVisibility(View.GONE);
Log.d("network", "=========>", error);
error.printStackTrace();
Toast.makeText(MainActivity.this, "Error Submitting Image", Toast.LENGTH_LONG).show();
}
}) {
@Override
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<String, String>();
params.put("your-key", your-data);
return params;
}
};