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copied!<p>If you are looking for a quick and dirty solution you can store the mapping between file and url in shared preferences like this:</p> <pre><code>public class FileCache { private File cacheDir; private File cacheDirEvent; private File cacheDirPromotion; public FileCache(final Context context) { //Find the dir to save cached images if (android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED)) { this.cacheDir = new File(android.os.Environment.getExternalStorageDirectory(), "TNLRadio/res/shows"); this.cacheDirEvent = new File(android.os.Environment.getExternalStorageDirectory(), "TNLRadio/res/events"); this.cacheDirPromotion = new File(android.os.Environment.getExternalStorageDirectory(), "TNLRadio/res/promotion"); } else { this.cacheDir = context.getCacheDir(); this.cacheDirEvent = context.getCacheDir(); this.cacheDirPromotion = context.getCacheDir(); } if (!this.cacheDir.exists() && !this.cacheDirEvent.exists() && !this.cacheDirPromotion.exists()) { this.cacheDir.mkdirs(); this.cacheDirEvent.mkdir(); this.cacheDirPromotion.mkdir(); } } public File getFile(final Context context, final String url) throws FileNotFoundException { // retrieve filename/location from shared preferences based on the the url final SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(context); String filename = settings.getString(url, null); if (url == null) { throw new FileNotFoundException(); } final File f = new File(this.cacheDir, filename); return f; } public void downloadAndCache(final Context context, final String url) { // TODO: download the file and save to the filesystem // TODO: generate a the filename and push into saved preferences String filename = ""; // save file into the share preferences so we can get it back late saveFileToMap(context, url, filename); } private void saveFileToMap(final Context context, final String url, final String filename) { final SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(context); // save the pair into shared preferences final Editor editor = settings.edit(); editor.putString(url, filename); editor.commit(); } } </code></pre>

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