在 JSON 数组中改造 POST 请求响应

Question

我是这方面的初学者。我正在尝试从 JSONarray 中的 POST 请求中获取响应。当我尝试在数组上获得响应时，我可以获得 JSON 对象。这是我的 POJO

用户.Java

public class User {
    @SerializedName("username")
    @Expose
    private String user;

    @SerializedName("pass")
    @Expose
    private String pass;

    @SerializedName("status")
    @Expose
    private String status;

    @SerializedName("message")
    @Expose
    private String message;

    @SerializedName("data")
    @Expose
    private ArrayList<Datum> data;

    public User(String user, String pass, String mesaage){
        this.user = user;
        this.pass = pass;
        this.message = message;
    }

    public String getStatus() {
        return status;
    }
    public ArrayList<Datum> getData() {
        return data;
    }

    public void setData(ArrayList<Datum> data) {
        this.data = data;
    }
    public String getMessage() {
        return message;
    }
}

Datum.Java：

public class Datum {
    @SerializedName("id")
    @Expose
    private String id;

    @SerializedName("username")
    @Expose
    private String username;

    @SerializedName("mk_nama")
    @Expose
    private String mkNama;

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getMkNama() {
        return mkNama;
    }

    public void setMkNama(String mkNama) {
        this.mkNama = mkNama;
    }
}

这是我的界面

public interface UserClient {
@FormUrlEncoded
@POST("login")
Call<User> loginAccount (
                            @Field("user") String username,
                            @Field("pass") String password
);}

这是我的 MainActivity

private void sendNetworkRequest(String username, String password) {

    Retrofit.Builder builder = new Retrofit.Builder()
            .baseUrl("https://prht.herokuapp.com/api/")
            .addConverterFactory(GsonConverterFactory.create());
    Retrofit retrofit = builder.build();

    UserClient client = retrofit.create(UserClient.class);
    Call<User> call = client.loginAccount(username,password);
    call.enqueue(new Callback<User>() {
        @Override
        public void onResponse(Call<User> call, Response<User> response) {
            Toast.makeText(LoginActivity.this, response.body().getData(),Toast.LENGTH_SHORT).show();
        }

        @Override
        public void onFailure(Call<User> call, Throwable t) {
            Toast.makeText(LoginActivity.this, "BAD ERROR" , Toast.LENGTH_SHORT).show();
        }
    });
}

getData() 中似乎无法到达 JSONarray 的对象

Answer 1

我认为这可能有效，但您可能应该更改一些细节。设置断点并调试以查看变量中发生了什么。

Data data = response.body().getData();
Datum datum = data.get(0);
Toast.makeText(LoginActivity.this,datum.getUsername() +" , "+ datum.getMkNama(),Toast.LENGTH_SHORT).show();