Simple JSON Parsing Example in Android – Part V

In this blog post, ill show you how to Retrieving JSON data from a Secured Site with Basic Authentication.

My Other blog post on JSON Tutorial.

1. Part I – What is JSON and how to code JSON data on Php
2. Part II – How to retrieve a simplest JSON data in Android
3. Part III – How to retrieve a JSON data to ListView in Android
4. Part IV – How to retrieve a complex typed JSON data in Android
5. Part V – How to retrieve a JSON data from a Secured Site with Basic Authentication
6. 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 3 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.

package com.skholingua.android.retrieving_secured_json_data;

import java.util.ArrayList;
import java.util.HashMap;

import org.json.JSONArray;
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.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;

public class MainActivity extends Activity {
/** Called when the activity is first created. */
ListView list;
Button getdata;
ArrayList<HashMap<String, String>> oslist = new ArrayList<HashMap<String, String>>();
private static String url = "http://serviceapi.skholingua.com/secured-feeds/list_multipletext_json.php";
private static final String TAG_OS = "Android Version List";
private static final String TAG_VER = "Version No";
private static final String TAG_NAME = "Version Name";
private static final String TAG_API = "API Level";

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

getdata = (Button) findViewById(R.id.getdata);
getdata.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
new JSONParse().execute();
getdata.setVisibility(View.INVISIBLE);
}
});

list = (ListView) findViewById(R.id.list);

}

private class JSONParse extends AsyncTask<Void, Void, Void> {
private ProgressDialog pDialog;

@Override
protected void onPreExecute() {
super.onPreExecute();

pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Getting Data ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}

@Override
protected Void doInBackground(Void... args) {
String _username = "admin";
String _password = "password";
String content = MyHttpURLConnection.getData(url, _username, _password);
try {
// Getting JSON Object from URL Content
JSONObject json = new JSONObject(content);
JSONArray jsonArray = json.getJSONArray(TAG_OS);
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject c = jsonArray.getJSONObject(i);
// Storing JSON item in a Variable
String name = c.getString(TAG_NAME);
String ver = c.getString(TAG_VER);
String api = c.getString(TAG_API);
// Adding value HashMap key => value
HashMap<String, String> map = new HashMap<String, String>();
map.put(TAG_VER, ver);
map.put(TAG_NAME, name);
map.put(TAG_API, api);
oslist.add(map);

}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}

@Override
protected void onPostExecute(Void args) {
pDialog.dismiss();
ListAdapter adapter = new SimpleAdapter(MainActivity.this, oslist,
R.layout.list_child, new String[] { TAG_VER, TAG_NAME,
TAG_API }, new int[] { R.id.vers, R.id.name,
R.id.api });
list.setAdapter(adapter);
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
Toast.makeText(
MainActivity.this,
"You Clicked at "
+ oslist.get(+position).get(TAG_NAME),
Toast.LENGTH_SHORT).show();
}
});
}
}

}

Step 2: Create a new class, MyHttpURLConnection.java and copy paste this code.

package com.skholingua.android.retrieving_secured_json_data;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

import org.apache.http.protocol.HTTP;

import android.util.Base64;

public class MyHttpURLConnection {

public static String getData(String uri, String userName, String password) {

BufferedReader reader = null;
byte[] loginBytes = (userName + ":" + password).getBytes();
StringBuilder loginBuilder = new StringBuilder().append("Basic ")
.append(Base64.encodeToString(loginBytes, Base64.NO_WRAP));
try {
URL url = new URL(uri);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
con.setReadTimeout(10000);
con.setConnectTimeout(15000);
con.addRequestProperty("Authorization", loginBuilder.toString());
con.setUseCaches(false);
con.connect();
InputStream is = con.getInputStream();
reader = new BufferedReader(new InputStreamReader(is, HTTP.UTF_8));
String data = null;
StringBuilder sb = new StringBuilder();
while ((data = reader.readLine()) != null) {
sb.append(data + "\n");
}
return sb.toString();

} catch (Exception e) {
e.printStackTrace();
return null;
} finally {
if (reader != null) {
try {
reader.close();
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
}

}
}

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"
tools:context="com.skholingua.android.retrieving_secured_json_data.MainActivity" >

<ListView
android:id="@+id/list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_above="@+id/getdata"
android:layout_alignParentTop="true" />

<Button
android:id="@+id/getdata"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:text="Get Data" />

</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.skholingua.android.retrieving_secured_json_data"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
android:minSdkVersion="16"
android:targetSdkVersion="19" />

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET" />

<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>

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ScreenShot:

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Tips to Remember always:

1. There is Nothing much difference between Part III blog vs this blog, except accessing a secured site with username and password credentials.

2. For Basic authentication, i’m using via .htaccess with password protecting a directory. for more details please this blog post.

3. The client-side authentication consists on a HTTP header called Authorization. Its value is a Base64-encoded string, with the following format:

username:password

After encoded, the header will look like this:

Authorization: Basic QWxhZGRpbjpvcGVuIHNlc2FtZQ==

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Hope this helpful. Your valuable comments are always welcomed. It will help to improve my post and understanding.

Download Source Code from here.