Android 平臺上讀寫 JSON 數據

JSON 很受歡迎，在 Android 上如何讀寫呢，請看以下代碼

package de.vogella.android.推ter.json;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONObject;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
public class ParseJSON extends Activity {
    /* Called when the activity is first created. /
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        String read推terFeed = read推terFeed();
        try {
            JSONArray jsonArray = new JSONArray(read推terFeed);
            Log.i(ParseJSON.class.getName(),
                    "Number of entries " + jsonArray.length());
            for (int i = 0; i < jsonArray.length(); i++) {
                JSONObject jsonObject = jsonArray.getJSONObject(i);
                Log.i(ParseJSON.class.getName(), jsonObject.getString("text"));
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

public String read推terFeed() {
    StringBuilder builder = new StringBuilder();
    HttpClient client = new DefaultHttpClient();
    HttpGet httpGet = new HttpGet(
            "http://推ter.com/statuses/user_timeline/vogella.json");
    try {
        HttpResponse response = client.execute(httpGet);
        StatusLine statusLine = response.getStatusLine();
        int statusCode = statusLine.getStatusCode();
        if (statusCode == 200) {
            HttpEntity entity = response.getEntity();
            InputStream content = entity.getContent();
            BufferedReader reader = new BufferedReader(
                    new InputStreamReader(content));
            String line;
            while ((line = reader.readLine()) != null) {
                builder.append(line);
            }
        } else {
            Log.e(ParseJSON.class.toString(), "Failed to download file");
        }
    } catch (ClientProtocolException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return builder.toString();
}

}</pre>生成JSON： 
  
 
  
public void writeJSON() {
    JSONObject object = new JSONObject();
    try {
        object.put("name", "Jack Hack");
        object.put("score", new Integer(200));
        object.put("current", new Double(152.32));
        object.put("nickname", "Hacker");
    } catch (JSONException e) {
        e.printStackTrace();
    }
    System.out.println(object);
}