When inserting data from Android to MySQL, why is all the data inserted with the number "1"?

When inserting data from Android to MySQL, why is all the data inserted with the number "1"?
When I insert it directly from the console, it inserts normally. What’s the problem?

This is my PHP code:

<?php
    $con = mysqli_connect("localhost", "root", "", "lice");
    mysqli_query($con, 'SET NAMES utf8'); 
    
    $name = isset($_POST["name"]);

    $statement = mysqli_prepare($con, "INSERT INTO USER(NAME) VALUES (?)");
    mysqli_stmt_bind_param($statement, "s", $name); 
    mysqli_stmt_execute($statement);

    $response = array();
    $response["success"] = true;

    echo json_encode($response);
?>

This is part of Activity code:

public void onClick(DialogInterface dialog, int whichButton) {
                name = uname.getText().toString();
                Response.Listener<String> responseListener = new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {
                        try {
                            JSONObject jsonObject = new JSONObject(response);
                            boolean success = jsonObject.getBoolean("success");

                            if(success){
                                Toast.makeText(getApplicationContext(), name + "success", Toast.LENGTH_SHORT).show();
                            } else {
                                Toast.makeText(getApplicationContext(), "fail", Toast.LENGTH_SHORT).show();
                            }
                        } catch (JSONException e) {
                            Toast.makeText(getApplicationContext(), e.toString(), Toast.LENGTH_SHORT).show();
                        }
                    }
                };

                UserRequest userRequest = new UserRequest(name, responseListener);
                RequestQueue queue = Volley.newRequestQueue( UserActivity.this );
                queue.add(userRequest);
            }
        });

This is Request code:

public class UserRequest extends StringRequest {
    final static private String URL = "my url";
    private Map<String, String> parameters;

    public UserRequest(String name, Response.Listener<String> listener) {
        super(Method.POST, URL, listener, null);
        parameters = new HashMap<>();
        parameters.put("name", name);
    }

    @Override
    public Map<String, String> getParams() {
        return parameters;
    }
}