php - boolean 检查的值在 "return check"处为空

Question

我在本地主机中使用 volley 连接，并且在本地主机中有一个 php 文件。下面是我的 VolleyConnectionLogin 类，我还有一个 volley 单例类(没有错误)..

public class VolleyConnectionLogin {

    Context context;
    public VolleyConnectionLogin(Context context){
        this.context = context;
    }

    static Boolean check;
    public Boolean volleyConnection(final String username , final String password) {
        String tag_string_req = "string_req";
        String url = "http://192.168.10.8/login/forlogin.php";
        StringRequest stringRequest = new StringRequest(Request.Method.POST,
                url,
                new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {
                        Log.d(TAG, response.toString());
                        if(response.toString().equals("successful")){
                            check = true;
                        }else{
                            check = false;
                        }
                    }
                }, new Response.ErrorListener() {

            @Override
            public void onErrorResponse(VolleyError error) {
                check = false;
                VolleyLog.d(TAG, "Error: " + error.getMessage());
            }
        }) {

            @Override
            protected Map<String, String> getParams() {
                Map<String, String> params = new HashMap<String, String>();
                params.put("uname", username);
                params.put("pword", password);
                return params;
            }

        };
        VolleySingleton.getInstance(context).addToRequestQueue(stringRequest);
        return check;
    }
}

Answer 1

因为您要在接收响应的线程之外返回 boolean 值，所以这个

 Log.d(TAG, response.toString());
                        if(response.toString().equals("successful")){
                            check = true;
                        }else{
                            check = false;
                        }
                    }

控制在响应返回之前转到return check;。