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My app is able to store registration token in localhost but fails to store the registration token in a online remote MySQL database.

The token is first saved in SharedPreferences then stored to the database server, but it only works in local machine, how can I store it in remote database server, everytime the user installs the application.

public class MainActivity extends AppCompatActivity 

private WebView webView;
private ProgressDialog dialog;
private BroadcastReceiver mRegistrationBroadcastReciever;
private final String CHANNEL_ID="notificcation";
String app_server_url="xxxxxxxxxxxxxxxxxxxxxxxx";





@Override
public void onBackPressed() 
AlertDialog.Builder builder=new AlertDialog.Builder(this);

if(webView.canGoBack())

 webView.goBack();
else
 builder.setTitle("Do you want to leave the TuneMe App?");
 builder.setMessage("Are you sure?");

 builder.setPositiveButton("Exit", new DialogInterface.OnClickListener() 
 @Override
 public void onClick(DialogInterface dialog, int which) 
 finish();
 
 );

 builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() 
 @Override
 public void onClick(DialogInterface dialog, int which) 

 
 );
 AlertDialog dialog=builder.show();
 

 

 @Override
 protected void onCreate(Bundle savedInstanceState) 
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

SharedPreferences sharedPreferences=getApplicationContext().getSharedPreferences(getString(R.string.FCM_PREF), Context.MODE_PRIVATE);
final String token=sharedPreferences.getString(getString(R.string.FCM_TOKEN),"");


StringRequest stringRequest=new StringRequest(Request.Method.POST, app_server_url, new Response.Listener<String>() 
 @Override
 public void onResponse(String response) 

 
, new Response.ErrorListener() 
 @Override
 public void onErrorResponse(VolleyError error) 

 
)


 @Override
 protected Map<String, String> getParams() throws AuthFailureError 
 Map<String,String>params=new HashMap<String,String>();
 params.put("fcm_token",token);
 return params;
 
;
MySingleton.getmInstance(MainActivity.this).addToRequestque(stringRequest);


webView=(WebView)findViewById(R.id.webView);
webView.getSettings().setJavaScriptEnabled(true);
webView.setWebChromeClient(new WebChromeClient());
webView.loadUrl("default_website");
webView.setWebViewClient(new WebViewClient()

 @Override
 public void onPageFinished(WebView view, String url) 

 if(dialog.isShowing())
 dialog.dismiss();
 
);



mRegistrationBroadcastReciever=new BroadcastReceiver() 
 @Override
 public void onReceive(Context context, Intent intent) 

 if(intent.getAction().equals(Config.STR_PUSH))
 

 String message=intent.getStringExtra(Config.STR_MESSAGE);
 showNotification("TuneMe Article",message);



 

 

;


 onNewIntent(getIntent());
 


 @Override
 protected void onNewIntent(Intent intent) 
 dialog=new ProgressDialog(this);
 if(intent.getStringExtra(Config.STR_KEY)!=null)

 dialog.show();
 dialog.setMessage("Please Wait");
 webView.loadUrl(intent.getStringExtra(Config.STR_KEY));



 

 private void showNotification(String title, String message) 
 notificationChannel();
 Bitmap picture = 
 BitmapFactory.decodeResource(getResources(),R.mipmap.app_launcher);


 Intent intent =new Intent(getBaseContext(),MainActivity.class);
 intent.putExtra(Config.STR_KEY,message);
 intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
PendingIntent contentIntent=PendingIntent.getActivity(getBaseContext(),0,intent,PendingIntent.FLAG_UPDATE_CURRENT);
NotificationCompat.Builder builder=new NotificationCompat.Builder(getBaseContext(),CHANNEL_ID);
builder.setAutoCancel(true)
 .setWhen(System.currentTimeMillis())
 .setDefaults(Notification.DEFAULT_ALL)
 .setSmallIcon(R.drawable.ic_sms_black_24dp)
 .setContentTitle(title)
 .setContentText(message)
 .setLargeIcon(picture)
 .setPriority(NotificationCompat.PRIORITY_HIGH)
 .setContentIntent(contentIntent);

NotificationManager notificationManager = (NotificationManager)getBaseContext().getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(1,builder.build());




 

 private void notificationChannel ()

 if(Build.VERSION.SDK_INT>=Build.VERSION_CODES.O)
 
 CharSequence name="Personal Notificaiton";
 String description="include";
 int importance=NotificationManager.IMPORTANCE_DEFAULT;

 NotificationChannel notificationChannel=new NotificationChannel(CHANNEL_ID,name,importance);
 notificationChannel.setDescription(description);
 NotificationManager notificationManager=(NotificationManager)getSystemService(NOTIFICATION_SERVICE);

 notificationManager.createNotificationChannel(notificationChannel);




 

 @Override
 protected void onPause() 

LocalBroadcastManager.getInstance(this).unregisterReceiver(mRegistrationBroadcastReciever);
super.onPause();

 @Override
 protected void onResume() 
 super.onResume();

LocalBroadcastManager.getInstance(this).registerReceiver(mRegistrationBroadcastReciever,new IntentFilter("registration Complete"));

LocalBroadcastManager.getInstance(this).registerReceiver(mRegistrationBroadcastReciever,new IntentFilter(Config.STR_PUSH));