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POProblem with downloading multiple files using AsyncTask
 

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    <p>I'm using the following script based on the tutorial <a href="http://www.softwarepassion.com/android-series-download-files-with-progress-dialog/" rel="noreferrer">Android Series: Download files with Progress Dialog</a> to download multiple video files from the internet to the SD card. It displays a progress bar while the download is in progress.</p> <pre><code>public class MyDownload extends Activity { public static final int DIALOG_DOWNLOAD_PROGRESS = 0; private Button startBtn; private ProgressDialog mProgressDialog; private String videoPath = "http://my_site.com/test_videos/"; private String[] fileNames = {"file1.mp4","file2.mp4"}; private TextView tv; /** 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); startBtn.setOnClickListener(new OnClickListener(){ public void onClick(View v) { startDownload(); } }); } private void startDownload() { tv = (TextView) findViewById(R.id.TextView01); if(checkExternalMedia()==true) { File file = null; for(int i=0; i&lt;fileNames.length; i++) { file = new File("/sdcard/videos/"+fileNames[i]); boolean exists = file.exists(); if(exists){ tv.append("\n\n"+fileNames[i]+" already exists"); continue; } else { new DownloadFileAsync().execute(videoPath+fileNames[i],fileNames[i]); } file = null; } } else { tv.append("\n\nExternal Media is NOT readable/writable"); } } @Override protected Dialog onCreateDialog(int id) { switch (id) { case DIALOG_DOWNLOAD_PROGRESS: mProgressDialog = new ProgressDialog(this); mProgressDialog.setMessage("Downloading files..."); mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); mProgressDialog.setCancelable(false); mProgressDialog.show(); return mProgressDialog; default: return null; } } /** Method to check whether external media available and writable. */ private boolean checkExternalMedia(){ boolean mExternalStorageAvailable = false; boolean mExternalStorageWriteable = false; boolean stat; String state = Environment.getExternalStorageState(); if (Environment.MEDIA_MOUNTED.equals(state)) { // Can read and write the media mExternalStorageAvailable = mExternalStorageWriteable = true; stat = true; } else if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) { // Can only read the media mExternalStorageAvailable = true; mExternalStorageWriteable = false; stat = false; } else { // Can't read or write mExternalStorageAvailable = mExternalStorageWriteable = false; stat = false; } tv.append("\n\nExternal Media: readable="+mExternalStorageAvailable+" writable="+mExternalStorageWriteable); return stat; } class DownloadFileAsync extends AsyncTask&lt;String, String, String&gt; { @Override protected void onPreExecute() { super.onPreExecute(); showDialog(DIALOG_DOWNLOAD_PROGRESS); } @Override protected String doInBackground(String... aurl) { int count; try { URL url = new URL(aurl[0]); URLConnection conexion = url.openConnection(); conexion.connect(); File root = android.os.Environment.getExternalStorageDirectory(); int lenghtOfFile = conexion.getContentLength(); Log.d("ANDRO_ASYNC", "Lenght of file: " + lenghtOfFile); InputStream input = new BufferedInputStream(url.openStream()); OutputStream output = new FileOutputStream(root.getAbsolutePath() + "/videos/" + aurl[1]); byte data[] = new byte[10485760]; long total = 0; while ((count = input.read(data)) != -1) { total += count; publishProgress(""+(int)((total*100)/lenghtOfFile)); output.write(data, 0, count); } output.flush(); output.close(); input.close(); } catch (Exception e) {} return null; } protected void onProgressUpdate(String... progress) { Log.d("ANDRO_ASYNC",progress[0]); mProgressDialog.setProgress(Integer.parseInt(progress[0])); } @Override protected void onPostExecute(String unused) { dismissDialog(DIALOG_DOWNLOAD_PROGRESS); tv.append("\n\nFile Download Completed!"); sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://"+ Environment.getExternalStorageDirectory()))); } } </code></pre> <p>}</p> <p>This code works fine when the size of each video is less (around 300KB). But when the video size increases to 7-8 MB the application crashes. </p> <p>However, if I try to download a single large file instead of</p> <pre><code>private String[] fileNames = {"file1.mp4","file2.mp4"}; </code></pre> <p>this code works fine. Any thoughts ?</p>
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    2. CO@Robby Pond ERROR/dalvikvm-heap(4539): Out of memory on a 10485776-byte allocation. 02-23 11:52:54.713: ERROR/AndroidRuntime(4539): Uncaught handler: thread AsyncTask #2 exiting due to uncaught exception 02-23 11:52:54.723: ERROR/AndroidRuntime(4539): java.lang.RuntimeException: An error occured while executing doInBackground() 02-23 11:52:54.723: ERROR/AndroidRuntime(4539): at android.os.AsyncTask$3.done(AsyncTask.java:200) 02-23 11:52:54.723: ERROR/AndroidRuntime(4539): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
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