Question

Ps.:JSON数据未在CardView中解析。

主要片段

我使用片段查看每个项目点击的数据，这些都是通过滑块菜单识别的。我编写了使用Retrofit Web服务解析JSON数据的代码。

public class Physical_Geography_Activity extends Fragment{
    View viewOne;
    private RecyclerView recyclerView;
    private ArrayList<QAModel> dataArray;
    private DataAdapter adapter;
    private ProgressDialog dialog;
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        viewOne=inflater.inflate(R.layout.geo_physical_layout,container,false);
        recyclerView=(RecyclerView)viewOne.findViewById(R.id.card_recycler_view);
        RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(viewOne.getContext());
        recyclerView.setLayoutManager(layoutManager);
        loadJSON();
        return viewOne;
    }
    private void loadJSON() {
        dialog = ProgressDialog.show(getContext(),"Please wait","Loading..",true);
        dialog.show();
        Retrofit retrofit = new Retrofit.Builder().baseUrl("https://api.myjson.com").addConverterFactory(GsonConverterFactory.create()).build();
        RequestInterface requestInterface = retrofit.create(RequestInterface.class);
        Call<JSONResponse> call = requestInterface.getJSON();
        call.enqueue(new Callback<JSONResponse>() {
            @Override
            public void onResponse(Call<JSONResponse> call, Response<JSONResponse> response) {
                dialog.dismiss();
                JSONResponse jsonResponse=response.body();
                dataArray = new ArrayList<QAModel>(Arrays.asList(jsonResponse.getPhysiography()));
                adapter= new DataAdapter(dataArray);
                recyclerView.setAdapter(adapter);
            }
            @Override
            public void onFailure(Call<JSONResponse> call, Throwable t) {
                Log.d("Error",t.getMessage());
            }
        });
    }
}

适配器

自定义ListView查看数据并编写持有者类来保存数据，我使用了两个TextViews来查看文本，即问答。每当我在远程服务器中添加数据时，问题和答案都会动态变化。

public class DataAdapter extends RecyclerView.Adapter<DataAdapter.ViewHolder> {
    private ArrayList<QAModel> arrayList;
    public DataAdapter(ArrayList<QAModel> arrayList) {
        this.arrayList = arrayList;
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.physical_card_layout,parent,false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        holder.question.setText(arrayList.get(position).getQuestion());
        holder.answer.setText(arrayList.get(position).getAnswer());
    }

    @Override
    public int getItemCount() {
        return arrayList.size();
    }

    public class ViewHolder extends RecyclerView.ViewHolder{
        TextView question,answer;
        public ViewHolder(View itemView) {
            super(itemView);
            question=(TextView)itemView.findViewById(R.id.tv_question);
            answer=(TextView)itemView.findViewById(R.id.tv_answer);


        }
    }
}

模型

Model有一个构造函数和两个私有字符串变量。我已经创建了用于从远程服务器获取和设置JSON数据的setter和getters方法。

public class QAModel {
    private String Question;
    private String Answer;

    public QAModel(String question, String answer) {
        Question = question;
        Answer = answer;
    }

    public String getQuestion() {
        return Question;
    }

    public void setQuestion(String question) {
        Question = question;
    }

    public String getAnswer() {
        return Answer;
    }

    public void setAnswer(String answer) {
        Answer = answer;
    }
}

JSON响应

编写JSON Response类是为了通过方法调用获取模型类的响应。

public class JSONResponse {
    private QAModel[] physiography;
    public QAModel[] getPhysiography()
    {
        return physiography;
    }
}

接口

Interface有一种从服务器获取数据的方法，即getJSON，接口确实有后缀url，用于保存JSON数据。

public interface RequestInterface {
    @GET("bins/lo1md")
    Call<JSONResponse> getJSON();
}

Answer 1

制作adapter.notifyDataSetChanged();

已编辑：

public class JSONResponse {
 @SerializedName("physiography")
 public List<Physiography> physiography = new ArrayList<Physiography>;
}

public class Physiography {
 @SerializedName("answer")
 public String answer;
 @SerializedName("question")
 public String question;   
}

更改你的响应类，然后检查它

Answer 2

您在基本网址“https://api.myjson.com”

中缺少“/”

请更新您的专线

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

到这个

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

您还需要将模型类更改为如下所示

public class JSONResponse {

    @SerializedName("physiography")
    @Expose
    private List<Physiography> physiography = null;

    public List<Physiography> getPhysiography() {
        return physiography;
    }

    public void setPhysiography(List<Physiography> physiography) {
        this.physiography = physiography;
    }

}

和

public class Physiography {

    @SerializedName("answer")
    @Expose
    private String answer;
    @SerializedName("question")
    @Expose
    private String question;

    public String getAnswer() {
        return answer;
    }

    public void setAnswer(String answer) {
        this.answer = answer;
    }

    public String getQuestion() {
        return question;
    }

    public void setQuestion(String question) {
        this.question = question;
    }

}

Answer 3

首先，不要将您的响应对象命名为常见的（JSONResponse）。请更恰当地命名，然后说PhysiographyResponse。使用squareup中的Moshi库，它会生成JSON响应的JAVA对象。

Moshi依赖

implementation 'com.squareup.retrofit2:converter-moshi:2.3.0'
implementation 'com.squareup.moshi:moshi:1.5.0'

数据模型类 -

import com.squareup.moshi.Json;

public class PhysiographyResponse {
    @Json(name = "physiography")
    List<QAModel> QAModel;

    public List<QAModel> getQAModel() {
        return QAModel;
    }

    public void setQAModel(List<QAModel> QAModel) {
        this.QAModel = QAModel;
    }
}

import com.squareup.moshi.Json;

public class QAModel {
    @Json(name = "answer")
    String answer;
    @Json(name = "question")
    String question;

    public String getAnswer() {
        return answer;
    }

    public void setAnswer(String answer) {
        this.answer = answer;
    }

    public String getQuestion() {
        return question;
    }

    public void setQuestion(String question) {
        this.question = question;
    }
}

Api界面

public interface RequestInterface {
    @GET("bins/lo1md")
    Call<PhysiographyResponse> getPhysiographyResponse();
}

改装电话

Call<PhysiographyResponse> call = requestInterface.getPhysiographyResponse();
        call.enqueue(new Callback<PhysiographyResponse>() {
            @Override
            public void onResponse(Call<PhysiographyResponse> call, Response<PhysiographyResponse> response) {
                dialog.dismiss();
                dataArray = new ArrayList<QAModel>(Arrays.asList(resposne.getQAModel));
                adapter= new DataAdapter(dataArray);
                recyclerView.setAdapter(adapter);
            }
            @Override
            public void onFailure(Call<JSONResponse> call, Throwable t) {
                Log.d("Error",t.getMessage());
            }
        });

Answer 4

轰！

1）将此gradle放入您的项目中。

implementation 'com.squareup.retrofit2:retrofit:2.4.0'
    implementation 'com.squareup.retrofit2:converter-gson:2.3.0'
    implementation 'com.google.code.gson:gson:2.8.0'

2）制作2个模型，第1个用于

QAModel

public class QAModel{
    @SerializedName("answer")
    private String Answer;
    @SerializedName("question")
    private String Question;

    public QAModel(String question, String answer) {
        Question = question;
        Answer = answer;
    }

    public String getQuestion() {
        return Question;
    }

    public void setQuestion(String question) {
        Question = question;
    }

    public String getAnswer() {
        return Answer;
    }

    public void setAnswer(String answer) {
        Answer = answer;
    }
}

和第二个服务器的响应

ResponseQAModel

public class ResponseQAModel {
    @SerializedName("physiography")
    private List<QAModel> qaModels;

    public List<QAModel> getQaModels() {
        return qaModels;
    }

    public void setQaModels(List<QAModel> qaModels) {
        this.qaModels = qaModels;
    }
}

3）您设置改造的ApiClient

public class ApiClient {
    public static final String BASE_URL = "https://api.myjson.com/";
    private static Retrofit retrofit = null;

    public static Retrofit getClient() {
        if (retrofit==null) {
            retrofit = new Retrofit.Builder()
                    .baseUrl(BASE_URL)
                    .addConverterFactory(GsonConverterFactory.create())
                    .build();
        }
        return retrofit;
    }
}

4）您的路线ApiInterface

public interface ApiInterface {
    @GET("/bins/lo1md")
    Call<ResponseQAModel> getJSON();
}

5）现在是时候捕捉输出了;）

private void loadGSON() {
        final Call<ResponseQAModel> responseQAModelCall;
        ApiInterface apiService = ApiClient.getClient().create(ApiInterface.class);

        responseQAModelCall = apiService.getJSON();

        responseQAModelCall.enqueue(new Callback<ResponseQAModel>() {
            @Override
            public void onResponse(Call<ResponseQAModel> call, Response<ResponseQAModel> response) {
                Log.d("kkkkk",response.body().getQaModels().toString());

                //responseQAMODELS contains all response pass to your adapter
                List<QAModel> responseQAModels = response.body().getQaModels();
            }

            @Override
            public void onFailure(Call<ResponseQAModel> call, Throwable t) {

            }
        });
    }

内容在Android片段中不可见

主要片段

适配器

模型

JSON响应

接口

4 个答案: