Web Services: REST with JSON Parsing Example

activit_main.xml

<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"

    tools:context=".MainActivity" >

    <ListView

        android:id="@+id/listView1"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_alignParentLeft="true"

        android:layout_alignParentTop="true" >

    </ListView>

</RelativeLayout>

custom_list_item.xml

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent" >

    <ImageView

        android:id="@+id/custom_imageView_poster"

        android:layout_width="60dp"

        android:layout_height="60dp"

        android:layout_alignParentLeft="true"

        android:layout_centerVertical="true" />

    <TextView

        android:id="@+id/custom_textView_title"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignTop="@+id/custom_imageView_poster"

        android:layout_marginLeft="20dp"

        android:layout_toRightOf="@+id/custom_imageView_poster"

        android:textAppearance="?android:attr/textAppearanceLarge" />

    <TextView

        android:id="@+id/custom_textView_year"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignBottom="@+id/custom_textView_title"

        android:layout_alignParentRight="true"

        android:layout_marginRight="10dp" />

    <TextView

        android:id="@+id/custom_textView_rating"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignBottom="@+id/custom_imageView_poster"

        android:layout_alignLeft="@+id/custom_textView_title"

        android:textAppearance="?android:attr/textAppearanceMedium" />

    <TextView

        android:id="@+id/custom_textView_type"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignLeft="@+id/custom_textView_title"

        android:layout_below="@+id/custom_textView_rating"

        android:layout_marginTop="5dp" />

</RelativeLayout>

MovieDetails.java

package com.swamys.webservices.pojo;

import android.graphics.Bitmap;

public class MovieDetails {

       private String title;

       private String rating;

       private String year;

       private String type;

       private Bitmap bitmap;

       public void setTitle(String title) {

              this.title = title;

       }

       public void setYear(String year) {

              this.year = year;

       }

       public void setRating(String rating) {

              this.rating = rating;

       }

       public void setType(String type) {

              this.type = type;

       }

       public void setBitmap(Bitmap bitmap) {

              this.bitmap = bitmap;

       }

       public String getTitle() {

              return title;

       }

       public String getYear() {

              return year;

       }

       public String getRating() {

              return rating;

       }

       public String getType() {

              return type;

       }

       public Bitmap getImage() {

              return bitmap;

       }

}

MainActivity.java

package com.swamys.webservicesrestexample;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.net.URL;

import org.apache.http.HttpResponse;

import org.apache.http.client.ClientProtocolException;

import org.apache.http.client.HttpClient;

import org.apache.http.client.methods.HttpPost;

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.app.ProgressDialog;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.os.AsyncTask;

import android.os.Bundle;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.ImageView;

import android.widget.ListView;

import android.widget.TextView;

import com.swamys.webservices.pojo.MovieDetails;

public class MainActivity extends Activity {

       JSONArray moviesArray;

       JSONObject movieObject;

       MovieDetails[] movieDetails;

       String image_url;

       JSONArray movieTypeJSONArray;

       ListView listView;

       ProgressDialog dialog;

       @Override

       protected void onCreate(Bundle savedInstanceState) {

              super.onCreate(savedInstanceState);

              setContentView(R.layout.activity_main);

              listView = (ListView) findViewById(R.id.listView1);

              myAsync async = new myAsync();

              async.execute();

       }

       class myAsync extends AsyncTask<String, String, String> {

              Bitmap mIcon;

              @Override

              protected void onPreExecute() {

                     // TODO Auto-generated method stub

                     super.onPreExecute();

                     dialog = new ProgressDialog(MainActivity.this);

                     dialog.setTitle("Loading data");

                     dialog.setMessage("Please wait article in loading..");

                     dialog.show();

              }

              @Override

              protected String doInBackground(String... params) {

                     // TODO Auto-generated method stub

                     String jsonContent = "";

                     // http client object

                     HttpClient httpClient = new DefaultHttpClient();

                     // HTTP POST object

                     HttpPost httpPost = new HttpPost(

                                  "http://api.androidhive.info/json/movies.json");

                     try {

                           // Execute the request and get the HttpResponse

                           HttpResponse httpResponse = httpClient.execute(httpPost);

                           InputStream inputStream = httpResponse.getEntity().getContent();

                           ;

                           jsonContent = convertToString(inputStream);

                           moviesArray = new JSONArray(jsonContent);

                           movieDetails = new MovieDetails[moviesArray.length()];

                           for (int i = 0; i < moviesArray.length(); i++) {

                                  // getting JSONObject from JSONArray

                                  movieObject = moviesArray.getJSONObject(i);

                                  // Creating MovieDetails class object to store values

                                  movieDetails[i] = new MovieDetails();

                                  // getting movie title from JSONObject

                                  movieDetails[i].setTitle(movieObject.getString("title"));

                                  // getting movie release year from JSONObject

                                  movieDetails[i].setYear(movieObject

                                                .getString("releaseYear"));

                                  // getting movie rating from JSONObject

                                  movieDetails[i].setRating(movieObject.getString("rating"));

                                  // getting movie poster url from JSONObject

                                  image_url = movieObject.getString("image");

                                  // getting image from the given url

                                  InputStream in = new URL(image_url).openStream();

                                  movieDetails[i].setBitmap(BitmapFactory.decodeStream(in));

                                  // getting movie type JSONArray from JSONObject

                                  movieTypeJSONArray = movieObject.getJSONArray("genre");

                                  String type = "";

                                  for (int j = 0; j < movieTypeJSONArray.length(); j++) {

                                         // getting type from JSONArray

                                         type += " " + movieTypeJSONArray.getString(j);

                                  }

                                  movieDetails[i].setType(type);

                           }

                     } catch (ClientProtocolException e) {

                           // TODO Auto-generated catch block

                           e.printStackTrace();

                     } catch (IOException e) {

                           // TODO Auto-generated catch block

                           e.printStackTrace();

                     } catch (JSONException e) {

                           // TODO Auto-generated catch block

                           e.printStackTrace();

                     }

                     return jsonContent;

              }

              @Override

              protected void onPostExecute(String result) {

                     // TODO Auto-generated method stub

                     super.onPostExecute(result);

                     MyAdapter adapter = new MyAdapter();

                     listView.setAdapter(adapter);

                     dialog.dismiss();

              }

              private String convertToString(InputStream inputStream)

                           throws IOException {

                     // creating StringBuilder Class object

                     StringBuilder builder = new StringBuilder();

                     // converting InputStream Object to BufferedReader

                     BufferedReader bufferedReader = new BufferedReader(

                                  new InputStreamReader(inputStream));

                     String line = "";

                     while ((line = bufferedReader.readLine()) != null) {

                           // Reading line-by-line and appending to StringBuilder

                           builder.append(line);

                     }

                     return builder.toString();

              }

       }

       class MyAdapter extends BaseAdapter {

              @Override

              public int getCount() {

                     return movieDetails.length;

              }

              @Override

              public Object getItem(int arg0) {

                     return null;

              }

              @Override

              public long getItemId(int position) {

                     return 0;

              }

              @Override

              public View getView(int position, View convertView, ViewGroup parent) {

                     View view = getLayoutInflater().inflate(R.layout.custom_list_item,

                                  null);

                     // creating reference for the views of custom list item

                     TextView textView_title = (TextView) view

                                  .findViewById(R.id.custom_textView_title);

                     TextView textView_year = (TextView) view

                                  .findViewById(R.id.custom_textView_year);

                     TextView textView_rating = (TextView) view

                                  .findViewById(R.id.custom_textView_rating);

                     TextView textView_type = (TextView) view

                                  .findViewById(R.id.custom_textView_type);

                     ImageView imageView = (ImageView) view

                                  .findViewById(R.id.custom_imageView_poster);

                     // set data to custom list item

                     textView_title.setText(movieDetails[position].getTitle());

                     textView_year.setText(movieDetails[position].getYear());

                     textView_rating.setText(movieDetails[position].getRating());

                     textView_type.setText(movieDetails[position].getType());

                     imageView.setImageBitmap(movieDetails[position].getImage());

                     return view;

              }

       }

}

Manifest.xml

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.swamys.webservicesrestexample"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="9"

        android:targetSdkVersion="18" />

    <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="com.swamys.webservicesrestexample.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>