Android 将json数据显示在RecyclerView

json数据要通过Get请求获取，这里有个重要的知识点，get请求需要拼接url的
本次拼接url的参数为phone，由于登录的时候已经填了手机号，如果这里再收集手机号就会让客户体验变差，于是我采用了SharedPreferences进行记录并调出

SharedPreferences pref=getSharedPreferences("data",MODE_PRIVATE);

        String phone=pref.getString("phone","");

得到了phone之后，我采用了okhttp请求返回json，注意：进行网络请求都需要开启线程以及一些必要操作
例如

<uses-permission android:name="android.permission.INTERNET" /> 

url为你申请的网络url

 new Thread(new Runnable() {
@Override

            public void run() {

                OkHttpClient client=new OkHttpClient().newBuilder()
.connectTimeout(60000, TimeUnit.MILLISECONDS)
.readTimeout(60000,TimeUnit.MILLISECONDS).build();
//url/phone

                Request request=new Request.Builder().url("url/phone"+phone).build();

                try {

                    Response sponse=client.newCall(request).execute();

                    String string = sponse.body().string();

                    Log.d("list",string);
jsonJXDate(string);

                }catch (IOException | JSONException e){

                    e.printStackTrace();

                }

            }

        }).start();

由上可知，string即为所需的json

展示大概长这样

{
"code": 200,
"message": "成功",
"data": [
{
"id": "string",
"createTime": "2023-04-18T05:50:08.905+00:00",
"updateTime": "2023-04-18T05:50:08.905+00:00",
"isDeleted": 0,
"param": {},
"phone": "15019649343",
"commercialTenant": "string",
"payTime": "2023-04-18T05:50:08.905+00:00",
"type": "string",
"paymentType": "string",
"bills": [
{
"product": "烧烤",
"amount": "4",
"price": "60",
"subtotal": "240"
}
],
"total": "string"
},
{
"id": "643e9efb09ecf071b0fd2df0",
"createTime": "2023-04-18T13:28:35.889+00:00",
"updateTime": "2023-04-18T13:28:35.889+00:00",
"isDeleted": 0,
"param": {},
"phone": "15019649343",
"commercialTenant": "string",
"payTime": "2023-04-18T13:28:35.889+00:00",
"type": "string",
"paymentType": "string",
"bills": [
{
"product": "兰州拉面",
"amount": "5",
"price": "40",
"subtotal": "200"
}
],
"total": "string"
}
],
"ok": true
}

我所需要的是payTime，product，subtotal

有{}用JSONObject，有[]用JSONArray，一步步来靠近你的需要

JSONObject j1 = new JSONObject(data);

            try {

                JSONArray array = j1.getJSONArray("data");

                for (int i=0;i<array.length();i++){
j1=array.getJSONObject(i);

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

                    String payTime = j1.getString("payTime");

                    JSONObject bills = j1.getJSONArray("bills").getJSONObject(0);

                    String product = bills.getString("product");

                    String subtotal = bills.getString("subtotal");

                    map.put("payTime",payTime);

                    map.put("product",product);

                    map.put("subtotal",subtotal);

                    list.add(map);

                }

                Message msg=new Message();
msg.what=1;

                handler.sendMessage(msg);


            }catch (JSONException e){

                e.printStackTrace();

            }


    }

    public Handler handler=new Handler(Looper.getMainLooper()) {

        @Override

        public void handleMessage(Message msg) {

            switch (msg.what) {

                case 1:

                    //添加分割线

                    rv.addItemDecoration(new androidx.recyclerview.widget.DividerItemDecoration(

                            MeActivity.this, androidx.recyclerview.widget.DividerItemDecoration.VERTICAL));

                    MyAdapter recy = new MyAdapter(MeActivity.this, list);

                    //设置布局显示格式

                    rv.setLayoutManager(new LinearLayoutManager(MeActivity.this));

                    rv.setAdapter(recy);

                    break;

            }

        }

    };

在adapter处通过常规layout显示后填入数据

 //定义时间展现格式

        Map<String, Object> map = list.get(position);

        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss.SSSXXX");

        LocalDateTime dateTime = LocalDateTime.parse(map.get("payTime").toString(), formatter);

        String strDate = dateTime.format(DateTimeFormatter.ofPattern("yyyy-MM-dd"));


        holder.produce.setText(map.get("product").toString());

        holder.payTime.setText(strDate);

        holder.price.setText(map.get("subtotal").toString());

就大功告成啦，由于后台那边还没把base64图片传上来，导致少了个图片，大致就是这样的