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POAndroid pause and resume downloading file to sdcard
 

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    <p>I am making an application in which I need to download a file from server and save it to sd card of android device.</p> <p>Apart of this there is a feature for the user to pause and resume the file.</p> <p>The problem I am facing is that I am able to download file to sdcard but when try to pause and resume it, it gets starts from the beginning.......</p> <p>Here is the source ......</p> <pre><code>public class DownloadWithProgressActivity extends Activity { public static final int DIALOG_DOWNLOAD_PROGRESS = 0; private Button startBtn, pauseButton, resumeButton; private ProgressBar bar; URLConnection conexion; OutputStream output; static int count = 0; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); startBtn = (Button) findViewById(R.id.startBtn); pauseButton = (Button) findViewById(R.id.button1); resumeButton = (Button) findViewById(R.id.button2); bar = (ProgressBar) findViewById(R.id.progressBar1); bar.setVisibility(ProgressBar.INVISIBLE); bar.setId(0); startBtn.setOnClickListener(new OnClickListener() { public void onClick(View v) { startDownload(); } }); pauseButton.setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { try { output.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }); resumeButton.setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { // not getting what to write here } }); } private void startDownload() { String url = "http://farm1.static.flickr.com/114/298125983_0e4bf66782_b.jpg"; new DownloadFileAsync().execute(url); } class DownloadFileAsync extends AsyncTask&lt;String, String, String&gt; { @Override protected void onPreExecute() { super.onPreExecute(); bar.setVisibility(ProgressBar.VISIBLE); } @Override protected String doInBackground(String... aurl) { int downloaded = 0; File file = new File("/sdcard/some_photo_from_gdansk_poland.jpg"); URL url = null; try { url = new URL(aurl[0]); } catch (MalformedURLException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } try { conexion = url.openConnection(); if (file.exists()) { downloaded = (int) file.length(); conexion.setRequestProperty("Range", "bytes="+(file.length())+"-"); } else { conexion.setRequestProperty("Range", "bytes=" + downloaded + "-"); } } catch (Exception exception1) { } conexion.setDoInput(true); conexion.setDoOutput(true); System.out.println(tryGetFileSize(url)); conexion.setRequestProperty("Range", "bytes=" + count + "-"); try { conexion.connect(); } catch (IOException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } int lenghtOfFile = conexion.getContentLength(); Log.d("ANDRO_ASYNC", "Lenght of file: " + lenghtOfFile); InputStream input = null; try { input = new BufferedInputStream(url.openStream()); } catch (IOException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } try { output = new FileOutputStream(file); } catch (FileNotFoundException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } byte data[] = new byte[1024]; long total = 0; try { while ((count = input.read(data)) != -1) { total += count; publishProgress("" + (int) ((total * 100) / lenghtOfFile)); output.write(data, 0, count); } } catch (IOException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } try { output.flush(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } try { output.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } try { input.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } return null; } protected void onProgressUpdate(String... progress) { Log.d("ANDRO_ASYNC", progress[0]); bar.setProgress(Integer.parseInt(progress[0])); System.out.println(Integer.parseInt(progress[0])); } protected void onPostExecute(String unused) { } int tryGetFileSize(URL url) { HttpURLConnection conn = null; try { conn = (HttpURLConnection) url.openConnection(); conn.setRequestMethod("HEAD"); conn.getInputStream(); return conn.getContentLength(); } catch (IOException e) { return -1; } finally { conn.disconnect(); } } } } </code></pre> <hr> <p>Please help.......</p> <p>Thanks Nikhil</p>
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