In This example calling restful webservice to get json data and parse that json data.
1. Call php file (php) from server and create JSON data in php.
2. Consume JSON data by android and show on activity.
3. Parse JSON data and Show parsed data on screen(activity).
This file contain Asyncronous server request, got JSON response and parse JSON and show on screen.
import java.io.BufferedReader;import java.io.InputStreamReader;import java.io.OutputStreamWriter;import java.io.UnsupportedEncodingException;import java.net.URL;import java.net.URLConnection;import java.net.URLEncoder;import org.apache.http.client.HttpClient;import org.apache.http.impl.client.DefaultHttpClient;import org.json.JSONArray;import org.json.JSONException;import org.json.JSONObject;import android.os.AsyncTask;import android.os.Bundle;import android.app.Activity;import android.app.ProgressDialog;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;public class RestFulWebservice extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.rest_ful_webservice); final Button GetServerData = (Button) findViewById(R.id.GetServerData); GetServerData.setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { // WebServer Request URL String serverURL = "/media/webservice/JsonReturn.php"; // Use AsyncTask execute Method To Prevent ANR Problem new LongOperation().execute(serverURL); } }); } // Class with extends AsyncTask class private class LongOperation extends AsyncTask<String, Void, Void> { // Required initialization private final HttpClient Client = new DefaultHttpClient(); private String Content; private String Error = null; private ProgressDialog Dialog = new ProgressDialog(RestFulWebservice.this); String data =""; TextView uiUpdate = (TextView) findViewById(R.id.output); TextView jsonParsed = (TextView) findViewById(R.id.jsonParsed); int sizeData = 0; EditText serverText = (EditText) findViewById(R.id.serverText); protected void onPreExecute() { // NOTE: You can call UI Element here. //Start Progress Dialog (Message) Dialog.setMessage("Please wait.."); Dialog.show(); try{ // Set Request parameter data +="&" + URLEncoder.encode("data", "UTF-8") + "="+serverText.getText(); } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } } // Call after onPreExecute method protected Void doInBackground(String... urls) { /************ Make Post Call To Web Server ***********/ BufferedReader reader=null; // Send data try { // Defined URL where to send data URL url = new URL(urls[0]); // Send POST data request URLConnection conn = url.openConnection(); conn.setDoOutput(true); OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream()); wr.write( data ); wr.flush(); // Get the server response reader = new BufferedReader(new InputStreamReader(conn.getInputStream())); StringBuilder sb = new StringBuilder(); String line = null; // Read Server Response while((line = reader.readLine()) != null) { // Append server response in string sb.append(line + ""); } // Append Server Response To Content String Content = sb.toString(); } catch(Exception ex) { Error = ex.getMessage(); } finally { try { reader.close(); } catch(Exception ex) {} } /*****************************************************/ return null; } protected void onPostExecute(Void unused) { // NOTE: You can call UI Element here. // Close progress dialog Dialog.dismiss(); if (Error != null) { uiUpdate.setText("Output : "+Error); } else { // Show Response Json On Screen (activity) uiUpdate.setText( Content ); /****************** Start Parse Response JSON Data *************/ String OutputData = ""; JSONObject jsonResponse; try { /****** Creates a new JSONObject with name/value mappings from the JSON string. ********/ jsonResponse = new JSONObject(Content); /***** Returns the value mapped by name if it exists and is a JSONArray. ***/ /******* Returns null otherwise. *******/ JSONArray jsonMainNode = jsonResponse.optJSONArray("Android"); /*********** Process each JSON Node ************/ int lengthJsonArr = jsonMainNode.length(); for(int i=0; i < lengthJsonArr; i++) { /****** Get Object for each JSON node.***********/ JSONObject jsonChildNode = jsonMainNode.getJSONObject(i); /******* Fetch node values **********/ String name = jsonChildNode.optString("name").toString(); String number = jsonChildNode.optString("number").toString(); String date_added = jsonChildNode.optString("date_added").toString(); OutputData += " Name : "+ name +" " + "Number : "+ number +" " + "Time : "+ date_added +" " +"--------------------------------------------------"; } /****************** End Parse Response JSON Data *************/ //Show Parsed Output on screen (activity) jsonParsed.setText( OutputData ); } catch (JSONException e) { e.printStackTrace(); } } } } } |
<?xml version="1.0" encoding="utf-8"?> android:fillViewport="true" android:background="#FFFFFF" android:layout_width="fill_parent" android:layout_height="fill_parent" > <LinearLayout android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <EditText android:paddingTop="20px" android:id="@+id/serverText" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="" /> <Button android:paddingTop="10px" android:id="@+id/GetServerData" android:text="Restful Webservice Call" android:cursorVisible="true" android:clickable="true" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal" /> <TextView android:paddingTop="20px" android:textStyle="bold" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Server Response (JSON): " /> <TextView android:paddingTop="16px" android:id="@+id/output" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Output : Click on button to get server data." /> <TextView android:paddingTop="20px" android:textStyle="bold" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Parsed JSON : " /> <TextView android:paddingTop="16px" android:id="@+id/jsonParsed" android:layout_width="fill_parent" android:layout_height="wrap_content" /></LinearLayout></ScrollView> |
<?xml version="1.0" encoding="utf-8"?> package="com.androidexample.restfulwebservice" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="8" /> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name="com.androidexample.restfulwebservice.RestFulWebservice" 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><uses-permission android:name="android.permission.INTERNET"></uses-permission></manifest> |
Create Json data on server
<?php // Get Post Data $data = urldecode($_POST['data']); $jsonData = array(); $jsonTempData = array(); for($i=1;$i<4; $i++) { $jsonTempData = array(); $jsonTempData['name'] = $data.$i; $jsonTempData['number'] = $data.$i; $jsonTempData['date_added'] = $data.$i; $jsonData[] = $jsonTempData; } $outputArr = array(); $outputArr['Android'] = $jsonData; // Encode Array To JSON Data print_r( json_encode($outputArr)); ?> |
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