Senden eine POST-Anfrage mit Volley zu PHP Script

Question

Im Versuch POST-Anfrage mit Volley von Android App zu PHP-Skript zu senden auf meinem Server gehostet. Wenn ich den Antwortcode bekomme, bekomme ich Code 200 Successfull aber $_POST in PHP-Skript ist leer.

Mein Android Request-Code:

try { 
     RequestQueue requestQueue = Volley.newRequestQueue(this); 
     String URL = getResources().getString(R.string.web_login); 
     JSONObject jsonBody = new JSONObject(); 
     jsonBody.put("hello", "world"); 
     jsonBody.put("username", username); 
     final String mRequestBody = jsonBody.toString(); 

     StringRequest stringRequest = new StringRequest(Request.Method.POST, URL, new Response.Listener<String>() { 
      @Override 
      public void onResponse(String response) { 
       Log.i("LOG_VOLLEY", response); 
      } 
     }, new Response.ErrorListener() { 
      @Override 
      public void onErrorResponse(VolleyError error) { 
       Log.e("LOG_VOLLEY", error.toString()); 
      } 
     }) { 
      @Override 
      public String getBodyContentType() { 
       return "text/plain; charset=utf-8"; 
      } 

      @Override 
      public byte[] getBody() throws AuthFailureError { 
       try { 
        return mRequestBody == null ? null : mRequestBody.getBytes("utf-8"); 

       } catch (UnsupportedEncodingException uee) { 
        VolleyLog.wtf("Unsupported Encoding while trying to get the bytes of %s using %s", mRequestBody, "utf-8"); 
        return null; 
       } 
      } 

      @Override 
      protected Response<String> parseNetworkResponse(NetworkResponse response) { 
       String responseString = ""; 
       if (response != null) { 

        try { 
          responseString = new String(response.data, "UTF-8"); 
        } catch (UnsupportedEncodingException e) { 
         e.printStackTrace(); 
        } 

       } 
       return Response.success(responseString, HttpHeaderParser.parseCacheHeaders(response)); 

      } 
     }; 

     requestQueue.add(stringRequest); 
    } catch (JSONException e) { 
     e.printStackTrace(); 
    } 

Dieser Code funktioniert gut, aber wenn ich den Antwort-Header erhalten enthält es die nächsten PHP-Fehler:

Undefined index: username

Hier ist mein PHP-Skript:

<?php 

//Get post data from Android App 
$name = $_POST['username']; 

if (isset($name)){ 
    $data = "OK"; 
    header('Content-Type: text/plain'); 
    echo $data; 
} 

?> 

Was mache ich falsch?

Answer 1

POST-Parameter sollten von getParams() gesendet werden.

Versuchen:

try { 
     final HashMap<String, String> params = new HashMap<>(); 
     params.put("username", username); 

     RequestQueue requestQueue = Volley.newRequestQueue(this); 
     String URL = getResources().getString(R.string.web_login); 
     JSONObject jsonBody = new JSONObject(); 
     jsonBody.put("hello", "world"); 
     jsonBody.put("username", username); 
     final String mRequestBody = jsonBody.toString(); 

     StringRequest stringRequest = new StringRequest(Request.Method.POST, URL, new Response.Listener<String>() { 
      @Override 
      public void onResponse(String response) { 
       Log.i("LOG_VOLLEY", response); 
      } 
     }, new Response.ErrorListener() { 
      @Override 
      public void onErrorResponse(VolleyError error) { 
       Log.e("LOG_VOLLEY", error.toString()); 
      } 
     }) { 
      @Override 
      public String getBodyContentType() { 
       return "text/plain; charset=utf-8"; 
      } 

      { 
       @Override 
       protected Map<String, String> getParams()throws AuthFailureError { 
       return params; 
      } 

       @Override 
       public byte[] getBody()throws AuthFailureError { 
       try { 
        return mRequestBody == null ? null : mRequestBody.getBytes("utf-8"); 

       } catch (UnsupportedEncodingException uee) { 
        VolleyLog.wtf("Unsupported Encoding while trying to get the bytes of %s using %s", mRequestBody, "utf-8"); 
        return null; 
       } 
      } 

       @Override 
       protected Response<String> parseNetworkResponse (NetworkResponse response){ 
       String responseString = ""; 
       if (response != null) { 

        try { 
         responseString = new String(response.data, "UTF-8"); 
        } catch (UnsupportedEncodingException e) { 
         e.printStackTrace(); 
        } 

       } 
       return Response.success(responseString, HttpHeaderParser.parseCacheHeaders(response)); 

      } 
      } 

      ; 

      requestQueue.add(stringRequest); 
     }catch(JSONException e){ 
      e.printStackTrace(); 
     }