Simple JSON Parsing Example in Android – Part II
In this blog post, ill show you how to Retrieving JSON data and Displaying it in Android TextView.
My Other blog post on JSON Tutorial.
- Part I – What is JSON and how to code JSON data on Php
- Part II – How to retrieve a simplest JSON data in Android
- Part III – How to retrieve a JSON data to ListView in Android
- Part IV – How to retrieve a complex typed JSON data in Android
- Part V – How to retrieve a JSON data from a Secured Site with Basic Authentication
- Part VI – How to Pass a JSON data to Php as a Parameters
Please read Part I of this blog, there you can create JSON data in php. I’m using Example 1 from that blog in this tutorial for making this blog to be simple. Hope you have created JSON data in php, so lets get started with retrieving in Android.
Step 1: Create a new project File -> Android Project. While creating a new project give activity name as MainActivity and copy paste this code.
import org.json.JSONException; import org.json.JSONObject; import android.app.Activity; import android.app.ProgressDialog; import android.os.AsyncTask; import android.os.Bundle; import android.widget.TextView; public class MainActivity extends Activity { /** Called when the activity is first created. */ private static String url = "http://geeks.gallery/android/android_json_demo_example.php"; String name, version; TextView tv1; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); new JSONParse().execute(); } private class JSONParse extends AsyncTask<String, String, JSONObject> { private ProgressDialog pDialog; @Override protected void onPreExecute() { super.onPreExecute(); tv1 = (TextView) findViewById(R.id.textView1); pDialog = new ProgressDialog(MainActivity.this); pDialog.setMessage("Loading Data ..."); pDialog.setIndeterminate(false); pDialog.setCancelable(true); pDialog.show(); tv1.setText("Getting Values Pls wait.."); } @Override protected JSONObject doInBackground(String... args) { JsonParser jParser = new JsonParser(); // Getting JSON from URL JSONObject json = jParser.getJSONFromUrl(url); return json; } @Override protected void onPostExecute(JSONObject json) { try { pDialog.dismiss(); name = json.getString("name"); version = json.getString("version"); tv1.setText(name + " - " + version); } catch (JSONException e) { e.printStackTrace(); } } } }
Step 2: Create a new class, JsonParser.java and copy paste this code.
import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.UnsupportedEncodingException; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.client.ClientProtocolException; import org.apache.http.client.methods.HttpPost; import org.apache.http.impl.client.DefaultHttpClient; import org.json.JSONException; import org.json.JSONObject; import android.util.Log; public class JsonParser { static InputStream is = null; static JSONObject jObj = null; static String json = ""; // constructor public JsonParser() { } public JSONObject getJSONFromUrl(String url) { // Making HTTP request try { // defaultHttpClient DefaultHttpClient httpClient = new DefaultHttpClient(); HttpPost httpPost = new HttpPost(url); HttpResponse httpResponse = httpClient.execute(httpPost); HttpEntity httpEntity = httpResponse.getEntity(); is = httpEntity.getContent(); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } catch (ClientProtocolException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } try { BufferedReader reader = new BufferedReader(new InputStreamReader( is, "iso-8859-1"), 8); StringBuilder sb = new StringBuilder(); String line = null; while ((line = reader.readLine()) != null) { sb.append(line + "n"); } is.close(); json = sb.toString(); } catch (Exception e) { Log.e("Buffer Error", "Error converting result " + e.toString()); } // try parse the string to a JSON object try { jObj = new JSONObject(json); } catch (JSONException e) { Log.e("JSON Parser", "Error parsing data " + e.toString()); } // return JSON String return jObj; } }
Step 3: Open your activity_main.xml and copy paste this code:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" > <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerHorizontal="true" android:layout_centerVertical="true" android:text="Medium Text" android:textAppearance="?android:attr/textAppearanceMedium" /> </RelativeLayout>
Step 4: Open your AndroidManifest.xml and add Internet Permission.
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.geeks.gallery.json_demoexample" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="16" android:targetSdkVersion="19" /> <uses-permission android:name="android.permission.INTERNET"/> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".MainActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
ScreenShot:
Download Source Code from here.
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durga chiranjeevi
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thanks so much