在android中显示Json数据

// 导入相关库
import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class MainActivity extends AppCompatActivity {

    private TextView textView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        textView = findViewById(R.id.textView);

        // 执行异步任务，获取并显示JSON数据
        new FetchJsonDataTask().execute("https://example.com/api/data.json");
    }

    private class FetchJsonDataTask extends AsyncTask<String, Void, String> {

        @Override
        protected String doInBackground(String... urls) {
            try {
                // 创建URL对象
                URL url = new URL(urls[0]);

                // 创建HTTP连接
                HttpURLConnection connection = (HttpURLConnection) url.openConnection();

                // 设置请求方法
                connection.setRequestMethod("GET");

                // 获取输入流
                InputStream inputStream = connection.getInputStream();

                // 将输入流转换为字符串
                BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
                StringBuilder stringBuilder = new StringBuilder();
                String line;
                while ((line = reader.readLine()) != null) {
                    stringBuilder.append(line);
                }
                reader.close();

                // 关闭连接
                connection.disconnect();

                // 返回获取到的JSON数据
                return stringBuilder.toString();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return null;
        }

        @Override
        protected void onPostExecute(String json) {
            if (json != null) {
                try {
                    // 解析JSON数据
                    JSONArray jsonArray = new JSONArray(json);

                    // 遍历JSON数组
                    StringBuilder stringBuilder = new StringBuilder();
                    for (int i = 0; i < jsonArray.length(); i++) {
                        JSONObject jsonObject = jsonArray.getJSONObject(i);

                        // 获取需要显示的数据字段
                        String name = jsonObject.getString("name");
                        int age = jsonObject.getInt("age");

                        // 拼接数据到字符串
                        stringBuilder.append("Name: ").append(name).append(", Age: ").append(age).append("\n");
                    }

                    // 在TextView中显示JSON数据
                    textView.setText(stringBuilder.toString());
                } catch (JSONException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}