Android获取文件的MD5值

public class DemoActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);

File file = new File("/mnt/sdcard/123.txt");
Log.e("MD5", getFileMD5(file));
}

/** * 获取单个文件的MD5值 * @param file 文件 * @param radix  位 16 32 64 * * @return */public static String getFileMD5s(File file,int radix) {    if (!file.isFile()) {        return null;    }    MessageDigest digest = null;    FileInputStream in = null;    byte buffer[] = new byte[1024];    int len;    try {        digest = MessageDigest.getInstance("MD5");        in = new FileInputStream(file);        while ((len = in.read(buffer, 0, 1024)) != -1) {            digest.update(buffer, 0, len);        }        in.close();    } catch (Exception e) {        e.printStackTrace();        return null;    }    BigInteger bigInt = new BigInteger(1, digest.digest());    return bigInt.toString(radix);}

/**
* 获取文件夹中文件的MD5值
*
* @param file
* @param listChild
* ;true递归子目录中的文件
* @return
*/

public static Map getDirMD5(File file, boolean listChild) {    if (!file.isDirectory()) {        return null;    }    Map map = new HashMap();    String md5;    File files[] = file.listFiles();    for (int i = 0; i < files.length; i++) {        File f = files[i];        if (f.isDirectory() && listChild) {            map.putAll(getDirMD5(f, listChild));        } else {            md5 = getFileMD5(f);            if (md5 != null) {                map.put(f.getPath(), md5);            }        }    }    return map;}}

最后不要忘了在manifest中添加权限

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