Android Volley kullanarak görüntü veya metin gönderme veya her ikisi de gönderme

Question

Android Volley kütüphanesini kullanarak görüntü ve metin gönderebiliyorum. Ancak Volley kütüphanesini kullanarak görüntülerin isteğe bağlı olarak nasıl kaydedilebileceğini? Sadece metin göndermeyi denediğimde Java null pointer exception atıldı. Opsiyonel içinde olmak için kodundan `veya boş olup olmadığını kontrol edebilirsiniz; Sorunuzu doğru anlamak

private void uploadImage(){ 
    //Showing the progress dialog 
    final ProgressDialog loading = ProgressDialog.show(this,"Uploading...","Please wait...",false,false); 
    StringRequest stringRequest = new StringRequest(Request.Method.POST, UPLOAD_URL, new Response.Listener<String>() { 
     @Override 
     public void onResponse(String s) { 
      //Disimissing the progress dialog 
      loading.dismiss(); 
      //Showing toast message of the response 
      Toast.makeText(PostActivity.this, s, Toast.LENGTH_LONG).show(); 
     } 
    }, 
    new Response.ErrorListener() { 
     @Override 
     public void onErrorResponse(VolleyError volleyError) { 
      //Dismissing the progress dialog 
      loading.dismiss(); 

      //Showing toast 
      Toast.makeText(PostActivity.this, volleyError.getMessage(), Toast.LENGTH_LONG).show(); 
     } 
    }) { 
     @Override 
     protected Map<String, String> getParams() throws AuthFailureError { 
      //Converting Bitmap to String 
      String rimage = null; 
      try { 
       rimage = getStringImage(bitmap); 
      } catch (UnsupportedEncodingException e) { 
       e.printStackTrace(); 
      } 

      //Getting Image Name 
      String FName = FoodName.getText().toString().trim(); 
      String LName = user.username; 

      //Creating parameters 
      Map<String, String> params = new Hashtable<String, String>(); 

      //Adding parameters 
      params.put(KEY_IMAGE, rimage); 
      params.put(KEY_NAME, FName); 
      params.put(KEY_LOGIN,LName); 

      //returning parameters 
      return params; 
     } 
    }; 

    //Creating a Request Queue 
    RequestQueue requestQueue = Volley.newRequestQueue(this); 

    //Adding request to the queue 
    requestQueue.add(stringRequest); 
} 

Answer 1

@Override 
     protected Map<String, String> getParams() throws AuthFailureError { 
      //Converting Bitmap to String 
      String image = getStringImage(bitmap); 

      //Getting Image Name 
      String name = editTextName.getText().toString().trim(); 

      //Creating parameters 
      Map<String,String> params = new Hashtable<String, String>(); 

      //Adding parameters 
      params.put(KEY_IMAGE, image); 
      params.put(KEY_NAME, name); 

      //returning parameters 
      return params; 
     } 

Answer 2

You can check you image string as null or not ! If it is not null then send it. 


    @Override 
      protected Map<String, String> getParams() throws AuthFailureError { 
       //Converting Bitmap to String 
       String rimage = null; 
       try { 
        rimage = getStringImage(bitmap); 
       } catch (UnsupportedEncodingException e) { 
        e.printStackTrace(); 
       } 

       //Getting Image Name 
       String FName = FoodName.getText().toString().trim(); 
       String LName = user.username; 

       //Creating parameters 
       Map<String, String> params = new Hashtable<String, String>(); 

       //Adding parameters 
       if(rimage!=null) 
       { 
       params.put(KEY_IMAGE, rimage); 
       } 
       params.put(KEY_NAME, FName); 
       params.put(KEY_LOGIN,LName); 

       //returning parameters 
       return params; 
      } 
     };