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my app downloads a zip with about 350 files. A mix of JPG and HTML files. The function i wrote to do it works just fine but the unzipping takes for ever. At first i thought the reason might be that writing to the sd-card is slow. but when i unzip the same zip with an other app on my phone it works much faster. is there anything that i could do to optimize it? here is the code: private void extract() { try { FileInputStream inStream = new FileInputStream(targetFilePath); ZipInputStream zipStream = new ZipInputStream(new BufferedInputStream(inStream)); ZipEntry entry; ZipFile zip = new ZipFile(targetFilePath); //i know the contents for the zip so i create the dirs i need in advance new File(targetFolder).mkdirs(); new File(targetFolder + "META-INF").mkdir(); new File(targetFolder + "content").mkdir(); int extracted = 0; while((entry = zipStream.getNextEntry()) != null) { if (entry.isDirectory()) { new File(targetFolder + entry.getName()).mkdirs(); } else { FileOutputStream outStream = new FileOutputStream(targetFolder + entry.getName()); for (int c = zipStream.read(); c != -1; c = zipStream.read()) { outStream.write(c); } zipStream.closeEntry(); outStream.close(); extracted ++; } publishProgress(""+(int)extracted*100/zip.size()); } zipStream.close(); inStream.close(); // new File(targetFilePath).delete(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } thanks to CommonsWare i modified my code like this: int size; byte[] buffer = new byte[2048]; FileOutp

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