在 json body volley post 请求中使用输入数据

Question

我是 Android 编程和 JSON 的新手。我正在尝试使用 volley post 请求调用身份验证 API。我正在尝试获取用户插入的用户名和密码并将其发送到 API 并返回响应。看来我无法直接将输入传递到请求的 JSON 正文中。您能否指出一种将从用户输入获取的数据输入到 JSON 正文请求的方法。我附上了我的代码，这样您就可以得到更好的想法。谢谢。

公共类 LoginActivity 扩展 AppCompatActivity {

Button login_btn;
EditText input_username, input_password;
String url;
RequestQueue queue;
StringRequest stringRequest;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_login);

    login_btn = findViewById(R.id.btn_login);
    input_username=findViewById(R.id.editText_username);
    input_password=findViewById(R.id.editText_password);
    
    url="https://restful-booker.herokuapp.com/auth";
    try {
        queue=Volley.newRequestQueue(this);
        JSONObject jsonBody = new JSONObject();


        String username = input_username.getText().toString();
        String password = input_password.getText().toString();


        jsonBody.put("username", username);
        jsonBody.put("password", password);

        final String mRequestBody = jsonBody.toString();
        stringRequest=new StringRequest(Request.Method.POST, url, new Response.Listener<String>() {
            @Override
            public void onResponse(String response) {
                Toast.makeText(LoginActivity.this, response,Toast.LENGTH_LONG).show();
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
               Toast.makeText(LoginActivity.this, error.toString(),Toast.LENGTH_LONG).show();
            }
        }){

            @Override
            public Map<String, String> getHeaders() throws AuthFailureError {
                HashMap header= new HashMap();
                header.put ("accept","*/*");
                header.put ("Content-Type","application/json");
                return  header;
            }
            @Override
            public String getBodyContentType() {
                return "application/json; charset=utf-8";
            }
            @Override
            public byte[] getBody() throws AuthFailureError {
                try {
                    return mRequestBody == null ? null : mRequestBody.getBytes("utf-8");
                } catch (UnsupportedEncodingException uee) {
                    VolleyLog.wtf("Unsupported Encoding while trying to get the bytes of %s using %s", mRequestBody, "utf-8");
                    return null;
                }
            }
            //Return Response code
        };
        login_btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                queue.add(stringRequest);
            }
        });

    }
    catch (JSONException e) {
        e.printStackTrace();
    }


}

}

Answer 1

我认为您直接在 onCreate 而不是 onClick 获取 edittext 的文本

这会起作用

public class LoginActivity extends AppCompatActivity {

    Button login_btn;
    EditText input_username, input_password;
    String url;
    RequestQueue queue;
    StringRequest stringRequest;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);

        login_btn = findViewById(R.id.btn_login);
        input_username=findViewById(R.id.editText_username);
        input_password=findViewById(R.id.editText_password);

        url="https://restful-booker.herokuapp.com/auth";
        queue=Volley.newRequestQueue(this);

        login_btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String username = input_username.getText().toString();
                String password = input_password.getText().toString();

                try {
                    JSONObject jsonBody = new JSONObject();
                    jsonBody.put("username", username);
                    jsonBody.put("password", password);

                    final String mRequestBody = jsonBody.toString();
                    stringRequest=new StringRequest(Request.Method.POST, url, new Response.Listener<String>() {
                        @Override
                        public void onResponse(String response) {
                            Toast.makeText(LoginActivity.this, response,Toast.LENGTH_LONG).show();
                        }
                    }, new Response.ErrorListener() {
                        @Override
                        public void onErrorResponse(VolleyError error) {
                           Toast.makeText(LoginActivity.this, error.toString(),Toast.LENGTH_LONG).show();
                        }
                    }){

                        @Override
                        public Map<String, String> getHeaders() throws AuthFailureError {
                            HashMap header= new HashMap();
                            header.put ("accept","*/*");
                            header.put ("Content-Type","application/json");
                            return  header;
                        }
                        @Override
                        public String getBodyContentType() {
                            return "application/json; charset=utf-8";
                        }
                        @Override
                        public byte[] getBody() throws AuthFailureError {
                            try {
                                return mRequestBody == null ? null : mRequestBody.getBytes("utf-8");
                            } catch (UnsupportedEncodingException uee) {
                                VolleyLog.wtf("Unsupported Encoding while trying to get the bytes of %s using %s", mRequestBody, "utf-8");
                                return null;
                            }
                        }
                    };

                    queue.add(stringRequest);
                } catch (JSONException e) {
                    e.printStackTrace();
                }
            }
        });
    }
}

希望它有效！！