Android Open Source - SELP2013 File Downloader

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License

The source code is released under:

License ======= This work is licensed under the BSD 2-clause license as follows. # BSD 2-clause license Copyright (c) 2013, Sky Welch All rights reserved. Redistribution and use in source and ...

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Java Source Code

package uk.co.skywelch.selp2013;
//from w  w w .  j a va 2  s. co  m
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

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

public class FileDownloader extends AsyncTask<String, Integer, Boolean> {
  public static final String TAG = "FileDownloader";
  public File file;

  @Override
  protected Boolean doInBackground(String... params) {
    try {
      URL url = new URL(params[0]);
      String path = Environment.getExternalStorageDirectory().getPath() + "/"
          + TimetableActivity.SDRoot + "/data/";

      File SDCardRoot = new File(path);
      file = new File(SDCardRoot, params[1]);
      Log.d(TAG, "Downloading " + file.getPath());

      // Open a connection to the given URL
      HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
      urlConnection.setRequestMethod("GET");
      urlConnection.setDoOutput(true);
      urlConnection.connect();

      // Set up folders for storage if they don't already exist
      if (!SDCardRoot.exists())
        SDCardRoot.mkdirs();
      if (!file.exists())
        file.createNewFile();
      FileOutputStream fileOutput = new FileOutputStream(file);

      InputStream inputStream = urlConnection.getInputStream();
      int totalSize = urlConnection.getContentLength();
      int downloadedSize = 0;

      // Read in 1024 bytes at a time to a buffer, publish progress
      byte[] buffer = new byte[1024];
      int bufferLength = 0;
      while ((bufferLength = inputStream.read(buffer)) > 0) {
        fileOutput.write(buffer, 0, bufferLength);
        downloadedSize += bufferLength;

        float progress = ((float) downloadedSize / (float) totalSize) * 100;
        publishProgress(Float.valueOf(progress).intValue());
      }

      fileOutput.close();
      return true;
    } catch (MalformedURLException e) {
      Log.e(TAG, "Bad URL passed to FileDownloader: " + e.getLocalizedMessage());
    } catch (IOException e) {
      Log.e(TAG, "Failed to process output file: " + e.getLocalizedMessage());
    }

    return false;
  }
}

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