How to update / refresh the data using Android Volley with Mysql?

Question

I’m new on the subject and new here, I’m displaying an excerpt of the code I’m using for testing. The data is normally displayed the first time I query through the application, but if I perform a new update, update, or delete, the data is not updated in the application, it remains displaying the old data.

I have a more complete app that I am developing but I came across this error and crashed. I have tried to clear the cache and disable but without result.

public void CarregarWebServices()
{
    progresso = new ProgressDialog(this);
    progresso.setMessage("Carregando...");
    progresso.show();
    String url = "https://meu_endreco/arquivo.php";

    jsonObjectReq = new JsonObjectRequest(Request.Method.GET, url,null,this,this);
    request.add(jsonObjectReq);

}

@Override
public void onErrorResponse(VolleyError error)
{
    progresso.hide();//fechando
    Toast.makeText(this,"Erro: "+error,Toast.LENGTH_LONG).show();
}
@Override
public void onResponse(JSONObject response)
{
    progresso.hide();//fechando
    textView.setText(response.toString());//exibindo os dados
}

Answer 1

managed to solve my problem by adding jsonArrayRequest.setShouldCache(false); and Queue.getCache(). clear();

I also added a GET/POST method and code even if the parameters are empty:

protected Map<String, String> getParams() throws AuthFailureError {
            Map<String, String> params = new HashMap<>();
            return params;
        }

Follow an example:

public void BuscarJson(String url) {
    // Initialize a new JsonArrayRequest instance
    jsonArrayRequest = new JsonArrayRequest(
            Request.Method.POST,
            url,
            null,
            new Response.Listener<JSONArray>() {
                @Override
                public void onResponse(JSONArray response) {
                    try{
                        for(int i=0;i<response.length();i++){
                            JSONObject obj = response.getJSONObject(i);
                            //guardando valor retornado na variável
                            String variavel = obj.getString("meu_campo_json");
                            //também poderá adicionar uma lista de valores (ArrayList)

                        }
                    }catch (JSONException e){
                        e.printStackTrace();
                    }
                }
            },
            new Response.ErrorListener(){
                @Override
                public void onErrorResponse(VolleyError error){
                    Toast.makeText(getContext(),"Erro: "+error,Toast.LENGTH_LONG).show();
                }
            }
    ){
        protected Map<String, String> getParams() throws AuthFailureError {
            Map<String, String> params = new HashMap<>();
            return params;
        }};

    jsonArrayRequest.setShouldCache(false);
    RequestQueue queue = Volley.newRequestQueue(getContext());
    queue.getCache().clear();
    queue.add(jsonArrayRequest);

}

If you didn’t want to, you can remove the repeat loop