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POHow to optimize External Storage file search on Android
 

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  1. POHow to optimize External Storage file search on Android
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    <p><strong>Requirement</strong></p> <p>Scan all folders and files on external storage to find all apk files and for each apk file, get info and display progress. </p> <p><strong>How I did it so far</strong></p> <p>My initial thought is that this is a simple thing to achieve. But well... even it it sort of works, it does not perform as expected. </p> <p>I use an AsyncTask to perform the scanning in background. Here is how I do:</p> <pre><code> private ArrayList&lt;String&gt; sdcardAppsPath; protected class ScanTask extends AsyncTask&lt;Context, Scanner, ArrayList&lt;Apk&gt;&gt; { private ArrayList&lt;Apk&gt; sdcardApps; @Override protected ArrayList&lt;App&gt; doInBackground(Context... params) { visitAllDirsAndFiles(Environment.getExternalStorageDirectory()); for (String path : sdcardAppsPath) { //get info about apk file and publishProgress(values) //show in some textviews number of files scanned, total files sdcardApps.add(currentScannedItemFoundInfo); } return sdcardApps } @Override protected void onProgressUpdate(Scanner... values) { super.onProgressUpdate(values); // update some textView texts based on values } } </code></pre> <p>And </p> <pre><code> // Process all files and directories under dir public void visitAllDirsAndFiles(File dir) { if (dir != null) { if (dir.getAbsoluteFile().toString().endsWith(".apk")) { sdcardAppsPath.add(dir.getAbsoluteFile().toString()); } if (dir.isDirectory()) { String[] children = dir.list(); if (children != null) { for (int i = 0; i &lt; children.length; i++) { visitAllDirsAndFiles(new File(dir, children[i])); } } } } } </code></pre> <p>As you can see after <code>vistitAllDirsAndFiles</code> I get an <code>ArrayList&lt;String&gt;</code> with all apk files I need, so I can check for each what I want. The downside is that it might take a lot of time to build this <code>sdcardAppsPath</code> if there are many files on the card and the app shows no progress while the paths are being found.</p> <p><strong>What I want to achieve</strong></p> <p>I want to be able in the <code>doInBackground</code> to somehow for each found file, get the info I need, update progress and then continue with scanning. Any ideas how to update my code to work like this ?</p>
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    1. COIs this the complete code listing? Don't you need an `onProgressUpdate`?
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      1. POHow to optimize External Storage file search on Android
      1. USDonald Smith
    2. COno relevant parts onProgressUpdate...
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      1. POHow to optimize External Storage file search on Android
      1. USAlin
    3. COActually, now that I look at it more closely, shouldn't you be calling `publishProgress` in your `visitAllDirsAndFiles` method if you want to update progress while searching for files?
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      1. POHow to optimize External Storage file search on Android
      1. USDonald Smith
 

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