android解析json下载

import android.os.AsyncTask;
import android.os.Bundle;
import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

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);

        new DownloadJsonTask().execute("https://api.example.com/data.json");
    }

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

        @Override
        protected String doInBackground(String... urls) {
            String result = "";
            try {
                // 这里应该使用合适的网络库如OkHttp或Retrofit来获取数据
                // 为了示例简单，这里省略了网络请求代码
                result = "{ \"name\": \"John\", \"age\": 30, \"city\": \"New York\" }";
            } catch (Exception e) {
                e.printStackTrace();
            }
            return result;
        }

        @Override
        protected void onPostExecute(String result) {
            try {
                JSONObject jsonObject = new JSONObject(result);
                String name = jsonObject.getString("name");
                int age = jsonObject.getInt("age");
                String city = jsonObject.getString("city");

                textView.setText("Name: " + name + "\nAge: " + age + "\nCity: " + city);
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
    }
}

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