Question

我有json数据的URL链接＆amp;我在我的应用程序Except Shape数据中显示了RecyclerView中的Color Name，Color Code等数据。如何显示形状数据？这是我的Json Url链接：https://raw.githubusercontent.com/ianbar20/JSON-Volley-Tutorial/master/Example-JSON-Files/Example-Array.JSON

这是我的AboutTask类

public class AboutTask extends AsyncTask<JSONObject, String, AboutResponse> {

OkHttpClient okHttpClient = new OkHttpClient();
Gson gson = new Gson();

@Override
protected AboutResponse doInBackground(JSONObject... params) {
    try {

        JSONObject jsonObject = params[0];

        //String url = "http://bitstobyte.in/api/about";
        String url = "https://raw.githubusercontent.com/ianbar20/JSON-Volley-Tutorial/master/Example-JSON-Files/Example-Array.JSON";

        Request request = new Request.Builder().url(url).build();

        Response response = okHttpClient.newCall(request).execute();

        if (!response.isSuccessful()) {
            Log.v("About_Answer", "About_Failed");
            throw new IOException("about_UnExpected Code" + response);
        }

        String strResponse = response.body().string();

        Log.e("about_strResponse", strResponse);

        AboutMainResponse[] aboutMainResponse = gson.fromJson(strResponse, AboutMainResponse[].class);

        //System.out.println(Arrays.toString(aboutMainResponse));

        System.out.println(aboutMainResponse);

        Log.e("aboutResp", "AboutResponse" + aboutMainResponse);
        return aboutMainResponse[0];

    } catch (NullPointerException e) {
        e.printStackTrace();
    } catch (IOException e) {
        Log.e("About_searchTask", e.toString());
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}

}

这是About_Fragment

public class About_Fragment extends android.support.v4.app.Fragment {
JSONObject jsonObject;

private List<AboutData> aboutDataList = new ArrayList<>();
private RecyclerView recyclerView;
private AboutAdapter aboutAdapter;
public About_Fragment() {
    // Required empty public constructor
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    // Inflate the layout for this fragment

    View rootView = inflater.inflate(R.layout.fragment_about_,container,false);

    recyclerView = (RecyclerView)rootView.findViewById(R.id.recyclerView);

    //recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));

    recyclerView.setHasFixedSize(true);

    RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getActivity());
    recyclerView.setLayoutManager(mLayoutManager);
    //recyclerView.addItemDecoration(new DividerItemDecoration(getActivity(), DividerItemDecoration.VERTICAL_LIST));
    recyclerView.setItemAnimator(new DefaultItemAnimator());

    recyclerView.setAdapter(aboutAdapter);
    aboutAdapter = new AboutAdapter(aboutDataList,getContext());

    new AboutTask(){
        @Override
        protected void onPostExecute(AboutResponse aboutResponse) {
            if (aboutResponse != null && aboutResponse.colorArray != null && aboutResponse.colorArray.size() > 0) {
                //if (aboutResponse != null && aboutResponse.shapeArray != null & aboutResponse.shapeArray.size() > 0)

                    aboutDataList = aboutResponse.colorArray;

                    //aboutDataList = aboutResponse.shapeArray;

                    aboutAdapter = new AboutAdapter(aboutDataList, getContext());

                    recyclerView.setAdapter(aboutAdapter);
                }
                Log.i("resp", "onPostExecute");
            }
    }.execute(jsonObject);
    return rootView;
}
}

这是我的AboutResponse代码：

public class AboutResponse {

public List<AboutData> shapeArray;
public List<AboutData> colorArray;
}

这是AboutMainResponse：

public class AboutMainResponse extends AboutResponse {

// public AboutResponse aboutResponse;

}

这是我的AboutAdapter代码：

public class AboutAdapter extends    RecyclerView.Adapter<AboutAdapter.MyViewHolder> {

private List<AboutData> aboutDataList;
private Context context;

public class MyViewHolder extends RecyclerView.ViewHolder {
    public TextView colorName;
    public ImageView nextArrowimage;
    public TextView hexaValue,title_three;
    private AboutData aboutData=null;

    public MyViewHolder(View view) {
        super(view);
        colorName = (TextView) view.findViewById(R.id.title_one);
        nextArrowimage = (ImageView)view.findViewById(R.id.about_NextArrow);
        hexaValue = (TextView) view.findViewById(R.id.title_two);
        title_three = (TextView)view.findViewById(R.id.title_three);
        view.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
            }
        });
    }
}


public AboutAdapter(List<AboutData> aboutDataList,Context context) {
    this.aboutDataList = aboutDataList;
    this.context = context;
}

@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_items, parent, false);
    MyViewHolder holder = new MyViewHolder(itemView);
    return new MyViewHolder(itemView);
}

@Override
public void onBindViewHolder(final MyViewHolder holder, final int position) {
    final AboutData aboutData = aboutDataList.get(position);
    holder.hexaValue.setText(aboutData.getHexValue());
    holder.colorName.setText(aboutData.getColorName());
    holder.title_three.setText(aboutData.getShapeArray());

    holder.nextArrowimage.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            String colorName = aboutData.getColorName();
            String hexaValue = aboutData.getHexValue();
            Intent intent = new Intent(context,Display_Activity.class);
            intent.putExtra("colorName",colorName);
            intent.putExtra("hexaValue",hexaValue);
            context.startActivity(intent);

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

}

Answer 1

使用gson为您的json数据创建Pojo，如下所示：

package com.example;

import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;

public class ColorArray {

@SerializedName("colorName")
@Expose
private String colorName;
@SerializedName("hexValue")
@Expose
private String hexValue;

public String getColorName() {
return colorName;
}

public void setColorName(String colorName) {
this.colorName = colorName;
}

public String getHexValue() {
return hexValue;
}

public void setHexValue(String hexValue) {
this.hexValue = hexValue;
}

}

----------------------------------- com.example.Example.java ----- ------------------------------

package com.example;

import java.util.List;
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;

public class Example {

@SerializedName("colorArray")
@Expose
private List<ColorArray> colorArray = null;
@SerializedName("shapeArray")
@Expose
private List<ShapeArray> shapeArray = null;

public List<ColorArray> getColorArray() {
return colorArray;
}

public void setColorArray(List<ColorArray> colorArray) {
this.colorArray = colorArray;
}

public List<ShapeArray> getShapeArray() {
return shapeArray;
}

public void setShapeArray(List<ShapeArray> shapeArray) {
this.shapeArray = shapeArray;
}

}

----------------------------------- com.example.ShapeArray.java ----- ------------------------------

package com.example;

import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;

public class ShapeArray {

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

public String getShapeName() {
return shapeName;
}

public void setShapeName(String shapeName) {
this.shapeName = shapeName;
}

}

您可以通过以下链接在线为您的json数据生成pojos：

http://www.jsonschema2pojo.org/

与下面的代码一样，您可以解析数据并获取Example类对象，其中包含颜色和形状列表形式的解析数据。

然后您使用Listview

将此列表设置为RecyclerView

Gson gson = new Gson();
Type listType = new TypeToken<List<Example>>(){}.getType();
List<Example> details = gson.fromJson(response, listType);

Answer 2

浏览this。通过一个volley.it是单个文本视图。但可能对你有所帮助

Answer 3

使用以下代码段

Gson gson = new Gson(); 
String jsonOutput = "Your JSON String"; 
Type listType = new TypeToken<List<Post>>(){}.getType(); 
List<Post> posts = (List<Post>) gson.fromJson(jsonOutput, listType);

如何使用Gson从JSON显示数据

3 个答案: