Calculate MD5 hash for a file - Android File Input Output

Android examples for File Input Output:File Hash

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Description

Calculate MD5 hash for a file

Demo Code


//package com.java2s;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Main {
    public static StringBuffer result;

    public static String apptoMD5(String app_path) {
        try {/*from w w  w  .ja  va2 s  .  co m*/
            MessageDigest digest = MessageDigest.getInstance("MD5");
            InputStream is = new FileInputStream(new File(app_path));
            int len = -1;
            byte[] bytes = new byte[1024];
            while ((len = is.read(bytes)) != -1) {
                digest.update(bytes, 0, len);
            }
            byte[] bytes1 = digest.digest();
            result = new StringBuffer();
            for (byte b : bytes1) {
                int i = b & 0xff;
                String hexString = Integer.toHexString(i);
                if (hexString.length() == 1) {
                    result.append(0);
                } else {
                    result.append(hexString);
                }
            }
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result.toString();
    }
}

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