JSon Example in Android
22/08/2012
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his example explains how to handle JSon parser. It shows how to read and write data to and from a JSon file. Algorithm: 1.) Create a new project by File-> New -> Android Project name it JSonExample. 2.) Write following into main.xml file:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/result" /> </LinearLayout>
3.) Put INTERNET permission to manifest file: 4.) Run for output. Steps: 1.) Create a project named JSonExample and set the information as stated in the image. Build Target: Android 4.0 Application Name: JSonExample Package Name: com. example. JSonExample Activity Name: JSonExampleActivity Min SDK Version: 14 2.) Open JSonExampleActivity.java file and write following code there:
package com.example.jsonexample;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.JSONException; import org.json.JSONObject; import android.app.Activity; import android.os.Bundle; import android.os.StrictMode; import android.util.Log; public class JSonExampleActivity extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); StrictMode.setThreadPolicy( new StrictMode.ThreadPolicy.Builder().detectDiskReads().detectDiskWrites().detectNetwork().penaltyLog().build()); writeJSON(); String readTwitterFeed = readTwitterFeed(); try { JSONArray jsonArray = new JSONArray(readTwitterFeed); Log.i(JSonExampleActivity.class.getName(), "Number of entries " + jsonArray.length()); for (int i = 0; i < jsonArray.length(); i++) { JSONObject jsonObject = jsonArray.getJSONObject(i); Log.i(JSonExampleActivity.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(JSonExampleActivity.class.toString(), "Failed to download file"); } } catch (ClientProtocolException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return builder.toString(); } public void writeJSON() { JSONObject object = new JSONObject(); try { object.put("name", "EDUMobile"); object.put("score", new Integer(200)); object.put("current", new Double(152.32)); object.put("nickname", "Android Tutor"); } catch (JSONException e) { e.printStackTrace(); } System.out.println(object); } }
3.) Compile and build the project. Output