DownloadHelper.java

package proj.Position;

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;

public class DownloadHelper {

	// Use android manager(2.3) to downlaod http file (not good!!!!!)

	// for (int i = 0; i < 30; i++) {
	// DownloadManager dm = (DownloadManager)
	// getSystemService(DOWNLOAD_SERVICE);
	// Request request = new Request(
	// Uri.parse("http://dl.dropbox.com/u/871055/iii.png"));
	// Uri.parse("http://i.imgur.com/XBqGN.jpg"));
	//
	// Uri uri = Uri
	// .parse("file:///mnt/sdcard/Position/test" + i + ".png");
	// request.setDestinationUri(uri);
	//
	// request.setDescription("YAYA");
	// dm.enqueue(request);
	// }

	public void downFile(String downloadURL, String savePath, String fileName) throws IOException, MalformedURLException {

		// set the download URL, a url that points to a file on the internet
		// this is the file to be downloaded
		URL url = new URL(downloadURL);

		// create the new connection
		HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();

		// set up some things on the connection
		urlConnection.setRequestMethod("GET");
		urlConnection.setDoOutput(true);

		// and connect!
		urlConnection.connect();

		// set the path where we want to save the file
		// in this case, going to save it on the root directory of the
		// sd card.

		// File SDCardRoot = Environment.getExternalStorageDirectory();

		// create a new file, specifying the path, and the filename
		// which we want to save the file as.
		File file = new File(savePath, fileName);

		// this will be used to write the downloaded data into the file we
		// created
		FileOutputStream fileOutput = new FileOutputStream(file);

		// this will be used in reading the data from the internet
		InputStream inputStream = urlConnection.getInputStream();

		// this is the total size of the file
		int totalSize = urlConnection.getContentLength();
		// variable to store total downloaded bytes
		int downloadedSize = 0;

		// create a buffer...
		byte[] buffer = new byte[1024];
		int bufferLength = 0; // used to store a temporary size of the
								// buffer

		// now, read through the input buffer and write the contents to the
		// file
		while ((bufferLength = inputStream.read(buffer)) > 0) {
			// add the data in the buffer to the file in the file output
			// stream (the file on the sd card
			fileOutput.write(buffer, 0, bufferLength);
			// add up the size so we know how much is downloaded
			downloadedSize += bufferLength;
			// this is where you would do something to report the prgress,
			// like this maybe
			updateProgress(downloadedSize, totalSize);

		}
		// close the output stream when done
		fileOutput.close();

		// catch some possible errors...

	}

	public static void updateProgress(int currentSize, int totalSize) {
		// mProgressText.setText(Long.toString((currentSize / totalSize) * 100)
		// + "%");
	}
}