Securing php api to use in android application

Question

I am newbie to android development. I am using android studio for developing an application. Things i have done

1. Created a DB with two ta

Answer 1

First add the dependencies in build gradle (app)
implementation 'com.mcxiaoke.volley:library:1.0.16' Then follow the below code:

 final ProgressDialog loading = ProgressDialog.show(getActivity(), "", "Please wait...", false, false);
        StringRequest stringRequest = new StringRequest(Request.Method.POST, ServerLinks.TOTAL_COUNT_URL, new Response.Listener() {
            @Override
            public void onResponse(String response) {
                loading.dismiss();
                try {
                    JSONObject jsonObject = new JSONObject(response);

                    String status = jsonObject.getString("status");

                    if (status.equals("success")) {
                        String data = jsonObject.getString("data");

                        JSONObject jsonObject1 = new JSONObject(data);
                        String male = jsonObject1.getString("male");
                        String female = jsonObject1.getString("female");


                    } else {
                        // no_data_found.setVisibility(View.VISIBLE);
                        Toast.makeText(getActivity(), "No Data Found", Toast.LENGTH_SHORT).show();
                    }
                } catch (JSONException e) {
                    e.printStackTrace();
                }
            }//onResponse()
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                loading.dismiss();
                //Toast.makeText(getActivity(), "Check Your Internet Connection", Toast.LENGTH_SHORT).show();
            }
        });
        int socketTimeout = 30000; // 30 seconds. You can change it
        RetryPolicy policy = new DefaultRetryPolicy(socketTimeout,
                DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
                DefaultRetryPolicy.DEFAULT_BACKOFF_MULT);

        stringRequest.setRetryPolicy(policy);
        RequestQueue requestQueue = Volley.newRequestQueue(getActivity());
        requestQueue.add(stringRequest);