Question

我正在将包含值的数组列表传递给另一个活动传递的数组列表包含以下值：

          "Details": [
            {
                "ID": 1,
                "Name": "ABC",
                 "Supervisor": [
                    {
                        "supervisorID": 1,
                        "Name": "XYZ"
                     }
                 ]
             }
           ]

我想从中获取主管的详细信息，并在回收者视图中显示我如何实现此目的

       ArrayList<String> myList = (ArrayList<String>) 
       getIntent().getSerializableExtra("site");

       mRecyclerView = findViewById(R.id.recycler_view);
       mRecyclerView.setHasFixedSize(true);
       mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
       mRecyclerView.addItemDecoration(new DividerItemDecoration(this, 
          LinearLayoutManager.VERTICAL));
       mRecyclerView.setItemAnimator(new DefaultItemAnimator());

Answer 1

创建带有变量名的模型类作为您的需求，并向我展示获取响应的函数您可以在其中使用JSON对象和字符串键进行解析像这样

try {
        // get JSONObject from JSON file
        JSONObject obj = new JSONObject(JSON_STRING);
        // fetch JSONObject named employee
        JSONObject employee = obj.getJSONObject("employee");
        // get employee name and salary
        name = employee.getString("name");
        salary = employee.getString("salary");
        // set employee name and salary in TextView's
        employeeName.setText("Name: "+name);
        employeeSalary.setText("Salary: "+salary);

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

Answer 2

完整的代码

公共类MainActivity扩展了AppCompatActivity {

// ArrayList for person names, email Id's and mobile numbers
ArrayList<String> personNames = new ArrayList<>();
ArrayList<String> emailIds = new ArrayList<>();
ArrayList<String> mobileNumbers = new ArrayList<>();

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    // get the reference of RecyclerView
    RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
    // set a LinearLayoutManager with default vertical orientation
    LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getApplicationContext());
    recyclerView.setLayoutManager(linearLayoutManager);

    try {
        // get JSONObject from JSON file
        JSONObject obj = new JSONObject(loadJSONFromAsset());
        // fetch JSONArray named users
        JSONArray userArray = obj.getJSONArray("users");
        // implement for loop for getting users list data
        for (int i = 0; i < userArray.length(); i++) {
            // create a JSONObject for fetching single user data
            JSONObject userDetail = userArray.getJSONObject(i);
            // fetch email and name and store it in arraylist
            personNames.add(userDetail.getString("name"));
            emailIds.add(userDetail.getString("email"));
            // create a object for getting contact data from JSONObject
            JSONObject contact = userDetail.getJSONObject("contact");
            // fetch mobile number and store it in arraylist
            mobileNumbers.add(contact.getString("mobile"));
        }
    } catch (JSONException e) {
        e.printStackTrace();
    }

    //  call the constructor of CustomAdapter to send the reference and data to Adapter
    CustomAdapter customAdapter = new CustomAdapter(MainActivity.this, personNames, emailIds, mobileNumbers);
    recyclerView.setAdapter(customAdapter); // set the Adapter to RecyclerView
}

public String loadJSONFromAsset() {
    String json = null;
    try {
        InputStream is = getAssets().open("users_list.json");
        int size = is.available();
        byte[] buffer = new byte[size];
        is.read(buffer);
        is.close();
        json = new String(buffer, "UTF-8");
    } catch (IOException ex) {
        ex.printStackTrace();
        return null;
    }
    return json;
}

}

在回收者视图中显示打包的字符串数组列表

2 个答案: