Java tutorial
//package com.java2s; //License from project: Apache License import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.security.MessageDigest; import android.util.Log; public class Main { private static final String TAG = "NarUtil"; public static byte[] copyFile(InputStream is, FileOutputStream os) throws IOException { MessageDigest digester = null; try { digester = MessageDigest.getInstance("MD5"); byte[] buffer = new byte[16 * 1024]; int length; while ((length = is.read(buffer)) > 0) { os.write(buffer, 0, length); digester.update(buffer, 0, length); } os.flush(); os.close(); //os.getFD().sync(); //Log.d(TAG, "done copying"); } catch (Exception e) { e.printStackTrace(); } finally { is.close(); Log.d(TAG, "done copying"); } if (digester != null) { byte[] digest = digester.digest(); return digest; } return null; } }