public class MainActivity extends AppCompatActivity {

    private RequestQueue queues ;

    String str;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        queues = Volley.newRequestQueue(this);

        String getcode = getcode();

        System.out.println(getcode+"得到响应");

    }

    public String getcode() {

        new Thread() {

            @Override

            public void run() {

                super.run();

                StringRequest stringRequest = new StringRequest(Request.Method.POST, "http://4444444444444/api/services/app/AppUser/Registe",

                        new Response.Listener<String>() {

                            @Override

                            public void onResponse(String response) {

                                System.out.println("响应" + response);

                                str = response;

                                handler.sendEmptyMessage(1);

                                Log.d("TAG", response);

                            }

                        }, new Response.ErrorListener() {

                    @Override

                    public void onErrorResponse(VolleyError error) {

                        Log.e("TAG", error.getMessage(), error);

                        System.out.println("错误" + error);

                    }

                }) {

                    @Override

                    protected Map<String, String> getParams() throws AuthFailureError {

                        // 请求参数

                        Map<String, String> map = new HashMap<String, String>();

                        //new 一个Map  参数放到Map中

                        map.put("Mobile", "15822222222");

                        map.put("UserPwd", "1234567");

                        System.out.println("添加参数");

                        return map;

                    }

                };

                queues.add(stringRequest);

                System.out.println("输出str是:" + str);

            }

        }.start();

        return str;

    }

    Handler handler = new Handler() {

        @Override

        public void handleMessage(Message msg) {

            super.handleMessage(msg);

            System.out.println("得到数据"+str);

        }

    };

    }

implementation 'com.dubsmash.volley:library:2.0.1'