Error in my Volley. I'm trying upload a image in my webserver

E/Volley: [5836] NetworkDispatcher.run: Unhandled exception
java.lang.NullPointerException: Attempt to invoke virtual method 'int
java.lang.String.length()' on a null object reference


This are my codes:

private ImageView imgNBI;
private Bitmap bitmap;
private String image, name, imgtype, retrieveDriverID,driverID;

private String KEY_DRIVERID = "driverid";
private String KEY_IMAGE = "image";
private String KEY_IMAGETYPE = "imgtype";
private String KEY_NAME = "name";
private Context ctx = this;

ProgressDialog pDialog;
Context context = this;

private String UPLOAD_URL ="http://angkas.net23.net/uploadimage1.php";


This is my code for update:

private void update()
pDialog = new ProgressDialog(context);
pDialog.setMessage("Loading...");
pDialog.setCancelable(false);
pDialog.show();
getUser();
retrieveDriverID = driverID;
StringRequest stringRequest = new StringRequest(Request.Method.POST, UPLOAD_URL,
new Response.Listener<String>()
@Override
public void onResponse(String response)
pDialog.dismiss();
Toast.makeText(Requirements_1.this, "This is response: "+response, Toast.LENGTH_LONG).show();

,
new Response.ErrorListener()
@Override
public void onErrorResponse(VolleyError error)
pDialog.dismiss();
Toast.makeText(Requirements_1.this, "This is error: "+error.getMessage(), Toast.LENGTH_LONG).show();

)
@Override
protected Map<String, String> getParams() throws AuthFailureError
image = getStringImage(bitmap);
String ddrid = retrieveDriverID;
String drname = name;

Map<String, String> params = new HashMap<>();
params.put(KEY_DRIVERID, ddrid);
if(ddrid != null)params.put(KEY_DRIVERID,ddrid);
params.put(KEY_IMAGETYPE, "NBIImg");
params.put(KEY_IMAGE, image);
if(image != null)params.put(KEY_IMAGE,image);
params.put(KEY_NAME, drname);
if(drname != null)params.put(KEY_NAME,drname);
return params;

;

RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(stringRequest);



This is for when I click the imageView:

public void clicknbi(View view)
showFileChooser("1");

private void showFileChooser(String request)
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent, "Select Picture"), 1);



This is the Activity Result:

protected void onActivityResult(int requestCode, int resultCode, Intent data)
super.onActivityResult(requestCode, resultCode, data);

if (requestCode == 1 && resultCode == RESULT_OK && data != null && data.getData() != null)
Uri filePath = data.getData();
try
//Getting the Bitmap from Gallery
bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), filePath);
//Setting the Bitmap to ImageView
imgNBI.setImageBitmap(bitmap);
catch (IOException e)
e.printStackTrace();





Converting image:

public String getStringImage(Bitmap bmp)
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.JPEG, 100, baos);
byte imageBytes = baos.toByteArray();
String encodedImage = Base64.encodeToString(imageBytes, Base64.DEFAULT);
return encodedImage;



And this is my PHP:

<?php
if($_SERVER['REQUEST_METHOD']=='POST')
$RegistrationDate = date('Y-m-d');
$driverid = $_POST['driverid'];
$imgtype = $_POST['imgtype'];
$image = $_POST['image'];
$name = $_POST['name'];

require_once('dbcon.php');

$pathname = "$name$imgtype";

$path = "Images/$pathname.png";

$actualpath = "http://angkas.net23.net/$path";

//$sql = "INSERT INTO driverregistration (DriverID,RegistrationDate,EnglishProficiency,TagalogProficiency,NBIImg) VALUES ('$driverid','$RegistrationDate','','','$actualpath');";

$sql = "UPDATE driverregistration SET NBIImg = '$actualpath' WHERE DriverID = $driverid;";


if(mysqli_query($con,$sql))

file_put_contents($path,base64_decode($image));
echo "Successfully Registered";

else

echo "Could not insert image";



else

echo 'error';

?>


I am encountering two errors. The first one is the null object reference and the second error is:

java.net.SocketException: sendto failed: EPIPE (Broken pipe)


I'm getting this error in my Toast.

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