Android Open Source - bbcplayer Json Parser

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Back to project page bbcplayer.

License

The source code is released under:

GNU General Public License

Java Source Code

/*
 * Class used to parse json data/*w  ww.  j  a  v  a 2 s  .c o m*/
 */

package com.rmgoncalo.bbcplayer;

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

import android.os.AsyncTask;
import android.util.JsonReader;
import android.util.Log;

public class JsonParser {

  private static final String logtag = "JsonParser";

  private static final String TAG_TOTAL = "total";
  private static final String TAG_MOVIES = "movies";
  private static final String TAG_RATINGS = "ratings";
  private static final String TAG_SCORE = "critics_score";

  private String urlString;
  private Integer score;

  public String getUrl() {
    return urlString;
  }

  public void setUrl(String url) {
    this.urlString = url;
  }

  public Integer getScore() {
    return score;
  }

  public void setScore(Integer score) {
    this.score = score;
  }

  private InputStream downloadUrl() throws IOException {
    URL url = new URL(urlString);
    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
    conn.setReadTimeout(10000 /* milliseconds */);
    conn.setConnectTimeout(15000 /* milliseconds */);
    conn.setRequestMethod("GET");
    conn.setDoInput(true);
    // Starts the query
    conn.connect();
    return conn.getInputStream();
  }

  private int readJsonStream(InputStream in) throws IOException {
    JsonReader reader = new JsonReader(new InputStreamReader(in, "UTF-8"));
    try {
      return readTotal(reader);
    } finally {
      reader.close();
    }
  }

  private int readTotal(JsonReader reader) throws IOException {
    int total = 0;

    reader.beginObject();
    while (reader.hasNext()) {
      String name = reader.nextName();
      if (name.equals(TAG_TOTAL)) {
        total = reader.nextInt();
      } else {
        reader.skipValue();
      }
    }
    reader.endObject();

    if (total > 0)
      return readScore(reader, TAG_MOVIES);
    else
      return 0;
  }

  private int readScore(JsonReader reader, String tag) throws IOException {

    int score = 0;

    reader.beginObject();
    while (reader.hasNext()) {
      String name = reader.nextName();
      if (name.equals(tag)) {
        score = readRatings(reader);
      } else {
        reader.skipValue();
      }
    }
    reader.endObject();

    return score;
  }

  private int readRatings(JsonReader reader) throws IOException {
    
    int ratings = 0;
    
    reader.beginArray();
    if (reader.hasNext()){
      reader.beginObject();
       while (reader.hasNext()) {
         String name = reader.nextName();
         if (name.equals(TAG_RATINGS)) {
           ratings = readScore(reader, TAG_SCORE);
         } else {
         reader.skipValue();
         }
       }     
      reader.endObject();
    }
    reader.endArray();
    
    return ratings;
  }  
  

  // Implementation of AsyncTask used to download JSON file
  private class DownloadJsonTask extends AsyncTask<Void, Void, Void> {
    
    @Override
    protected Void doInBackground(Void...params) {
      try {
        loadJsonFromNetwork();
      } catch (IOException e) {
        Log.d(logtag, "doInBackground IOException");
        return null;
      }
      
      return null;
    }

  }

  private void loadJsonFromNetwork() throws IOException {
    InputStream stream = null;
    Integer score = Integer.valueOf(0);

    try {
      stream = downloadUrl();
      score = readJsonStream(stream);

      // Makes sure that the InputStream is closed after the app is
      // finished using it.
    } finally {
      if (stream != null) {
        stream.close();
      }
    }

    this.score = score;
  }
  
  public void start(){
    DownloadJsonTask jtask = new DownloadJsonTask();
    jtask.execute();
  }

}

Java Source Code List

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