Question

我慢慢看着Android Studio中的json响应，我一直在研究这个例子

http://spring.io/guides/gs/consuming-rest-android/

我有它的工作，但我想破译的是元素设置的地方。例如，这当前可以显示json响应的“id”和“content”部分。如果我想从回复中显示“日期”怎么办？

这是主要活动代码

package org.hello.rest9;

import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.web.client.RestTemplate;

public class MainActivity extends ActionBarActivity {

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

        if (savedInstanceState == null) {
            getSupportFragmentManager().beginTransaction()
                    //.add(R.id.container, new PlaceholderFragment())
                    .commit();
        }
    }

    @Override
    protected void onStart() {
        super.onStart();
        new HttpRequestTask().execute();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_refresh) {
            new HttpRequestTask().execute();
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    /**
     * A placeholder fragment containing a simple view.
     */
    public static class PlaceholderFragment extends Fragment {

        public PlaceholderFragment() {
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                 Bundle savedInstanceState) {
            View rootView = inflater.inflate(R.layout.fragment_main, container, false);
            return rootView;
        }
    }


    private class HttpRequestTask extends AsyncTask<Void, Void, Greeting> {
        @Override
        protected Greeting doInBackground(Void... params) {
            try {
                final String url = "http://rest-service.guides.spring.io/greeting";
                RestTemplate restTemplate = new RestTemplate();
                restTemplate.getMessageConverters().add(new MappingJackson2HttpMessageConverter());
                Greeting greeting = restTemplate.getForObject(url, Greeting.class);
                return greeting;
            } catch (Exception e) {
                Log.e("MainActivity", e.getMessage(), e);
            }

            return null;
        }

        @Override
        protected void onPostExecute(Greeting greeting) {
            TextView greetingIdText = (TextView) findViewById(R.id.id_value);
            TextView greetingContentText = (TextView) findViewById(R.id.content_value);
            greetingIdText.setText(greeting.getId());
            greetingContentText.setText(greeting.getContent());
        }

    }


}

这是Greeting.class

package org.hello.rest9;

    public class Greeting {

        private String id;
        private String content;

        public String getId() {
            return this.time;
        }

        public String getContent() {
            return this.content;
        }

    }

我能解读的是greeting.class设置我们想要抓取的元素，在这种情况下是content和id。但我很想知道如何定义其他元素，例如将“content”替换为“date”

干杯

Answer 1

您可以尝试在public String date;课程中添加额外的属性Greeting。当然，您必须确保数据源JSON也有一个具有相同名称的字段，否则模板将无法工作...

如果您将content替换为date，则仍需确保数据源JSON中存在"date"。

JSON数据变量解密

1 个答案: