本文实例讲述了Android实现读写JSON数据的方法。分享给大家供大家参考。具体如下:
1. 解析JSON:
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package de.vogella.android.twitter.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 readTwitterFeed = readTwitterFeed(); try { JSONArray jsonArray = new JSONArray(readTwitterFeed); 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 readTwitterFeed() { StringBuilder builder = new StringBuilder(); HttpClient client = new DefaultHttpClient(); HttpGet httpGet = new HttpGet( "http://twitter.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(); } } |
2. 生成JSON:
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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); } |
希望本文所述对大家的Android程序设计有所帮助。