Android Open Source - Weather Network

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License

The source code is released under:

Apache License

Java Source Code

package com.volitic.weather;
/*from  w w w  .j a  va2  s.c  o  m*/
import android.content.Context;
import android.content.SharedPreferences;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;
import android.preference.PreferenceManager;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.charset.Charset;

public class Network {

    Downloader receiver;
    Context context;

    public interface Downloader {
        public void downloadFailed();
        public void downloadSucceeded(InputStream result);
    }

    Network( Downloader receiver, Context context ){

        this.context = context;
        this.receiver = receiver;

    }

    public void download( String url ){

        if( connectionIsValid() ){

            new DownloadTask().execute(url);

        } else {
            receiver.downloadFailed();
        }

    }

    public boolean connectionIsValid() {

        ConnectivityManager connMgr =
                    (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

        NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();

        if ((networkInfo != null  && networkInfo.isConnected())
           && (networkInfo.getType() == ConnectivityManager.TYPE_WIFI || useMobile())) {
            return true;
        }
        return false;

    }

    private boolean useMobile(){
        SharedPreferences shared_prefs = PreferenceManager.getDefaultSharedPreferences(context);
        return shared_prefs.getBoolean("allow_mobile_data", false);
    }

    private class DownloadTask extends AsyncTask<String, Void, InputStream> {
        @Override
        protected InputStream doInBackground(String... urls) {

            try {
                // parameter comes from the execute() call. params[0] is the url.
                return downloadData(urls[0]);
            } catch (IOException e) {
                return null;
            }
        }

        // onPostExecute displays the results of the AsyncTask.
        @Override
        protected void onPostExecute(InputStream result) {
            if(result == null ){
                receiver.downloadFailed();
            } else {
                receiver.downloadSucceeded(result);
            }
        }
    }

    // Given a URL, establishes an HttpUrlConnection and retrieves
    // the web page content as an InputStream.
    private InputStream downloadData(String url_string) throws IOException {

        URL url = new URL(url_string);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setReadTimeout(10000 /* milliseconds */);
        conn.setConnectTimeout(15000 /* milliseconds */);
        conn.setRequestMethod("GET");
        conn.setDoInput(true);

        // Starts the query
        conn.connect();

        int response = conn.getResponseCode();
        if(response == 200 ){
            return conn.getInputStream();
        } else {
            return new ByteArrayInputStream(Charset.forName("UTF-8").encode(
                    "<?xml version=\"1.0\" encoding=\"UTF-8\"?><error><response_code>"
                    + response
                    + "</response_code></error>"
                    ).array());
        }

    }
}

Java Source Code List

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