CheckUpdateTask.java

package com.mygeopay.wallet.tasks;

import android.os.AsyncTask;

import com.mygeopay.wallet.Constants;
import com.google.common.base.Charsets;

import org.json.JSONObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.security.KeyStore;

import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManagerFactory;

/**
 * @author John L. Jegutanis
 */
public class CheckUpdateTask extends AsyncTask<Void, Void, Integer> {
    private static final Logger log = LoggerFactory.getLogger(CheckUpdateTask.class);

    @Override
    protected Integer doInBackground(Void... params) {
        HttpURLConnection connection = null;

        try {
            connection = (HttpURLConnection) new URL(Constants.VERSION_URL).openConnection();
            connection.setInstanceFollowRedirects(true);
            connection.setConnectTimeout(Constants.HTTP_TIMEOUT_MS);
            connection.setReadTimeout(Constants.HTTP_TIMEOUT_MS);
            connection.setRequestProperty("Accept-Charset", "utf-8");
            connection.connect();

            if (connection.getResponseCode() == HttpURLConnection.HTTP_OK) {
                final BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream(), Charsets.UTF_8), 64);
                String line = reader.readLine().trim();
                reader.close();
                return Integer.valueOf(line);
            }
        } catch (final Exception e) {
            log.info("Could not check for update", e);
        } finally {
            if (connection != null)
                connection.disconnect();
        }

        return null;
    }
}