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POApp slows down with calculation of length in seconds of WAV file
 

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  1. POApp slows down with calculation of length in seconds of WAV file
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    <p>In a ListView of sound files in a folder I want to show the length in seconds of the files. The steps that I take:</p> <ol> <li>First I create an ArrayList for the instances of the soundFiles. </li> <li>Then in a for loop I add the data to the instance by soundFile.setLength(calculateLength(file[i])).</li> <li>After this I initiate my CustomArrayAdapter and I apply it to my listView.</li> <li>In my CustomArrayAdapter I apply it: tvFileLength.setText(soundFile.getLength()); (whith a holder though..)</li> </ol> <p>But since I am doing this, my app is slower than a turtle! (having 400 files) Is there any way I can fix this speed?</p> <pre><code>private int calculateLength(File yourFile) throws IllegalArgumentException, IllegalStateException, IOException { MediaPlayer mp = new MediaPlayer(); FileInputStream fs; FileDescriptor fd; fs = new FileInputStream(yourFile); fd = fs.getFD(); mp.setDataSource(fd); mp.prepare(); int length = mp.getDuration(); length = length / 1000; mp.release(); return length; } </code></pre> <hr> <pre><code> **EDIT** </code></pre> <p>New code I am having:</p> <p>Activity</p> <pre><code>myList = new ArrayList&lt;RecordedFile&gt;(); File directory = Environment.getExternalStorageDirectory(); file = new File(directory + "/test/"); File list[] = file.listFiles(); for (int i = 0; i &lt; list.length; i++) { if (checkExtension(list[i].getName()) == true) { RecordedFile q = new RecordedFile(); q.setTitle(list[i].getName()); q.setFileSize(readableFileSize(list[i].length())); //above is the size in kB, is something else but I //also might move this to the AsyncTask! myList.add(q); } } new GetAudioFilesLength(myList).execute(); </code></pre> <p>AsyncTask</p> <pre><code>List&lt;RecordedFile&gt; mFiles = new ArrayList&lt;RecordedFile&gt;(); public GetAudioFilesLength(List&lt;RecordedFile&gt; theFiles) { mFiles = theFiles; } @Override protected String doInBackground(Void... params) { File directory = Environment.getExternalStorageDirectory(); // File file = new File(directory + "/test/"); String mid = "/test/"; for (RecordedFile fileIn : mFiles) { File file = new File(directory + mid + fileIn.getTitle()); try { int length = readableFileLengthSeconds(file); fileIn.setFileLengthSeconds(length); } catch (IllegalArgumentException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IllegalStateException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } // Do something with the length // You might want to update the UI with the length of this file // with onProgressUpdate so that you display the length of the files // in real time as you process them. } return mid; } @Override protected void onProgressUpdate(Void... values) { } @Override protected void onPostExecute(String result) { // Update the UI in any way you want. You might want // to store the file lengths somewhere and then update the UI // with them here } /* * @Override protected void onPreExecute() { } */ public int readableFileLengthSeconds(File yourFile) throws IllegalArgumentException, IllegalStateException, IOException { MediaPlayer mp = new MediaPlayer(); FileInputStream fs; FileDescriptor fd; fs = new FileInputStream(yourFile); fd = fs.getFD(); mp.setDataSource(fd); mp.prepare(); // might be optional int length = mp.getDuration(); length = length / 1000; mp.release(); return length; } </code></pre> <p>Awesome, it works partly, but! I got 2 remaining questions:</p> <ol> <li>Does this looks ok and efficient? </li> <li>It works for lets say the first 100 elements in my listview, after that it displays 0 s, it has something to do with onProgressUpdate I assume, but I am not sure how I can make this work.</li> </ol>
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