Android 获取app(apk)签名

import android.content.pm.Signature;    public static String getSignature(Activity activity) {        StringBuffer signStr = new StringBuffer();        Signature[] signs = getRawSignature(activity, activity.getPackageName());        if (signs != null && signs.length > 0) {            for (Signature sign : signs) {                String signMd5 = getMessageDigest(sign.toByteArray());                signStr.append(signMd5);            }        }        return signStr.toString();    }    private static Signature[] getRawSignature(Context context, String packageName) {        if (!TextUtils.isEmpty(packageName)) {            PackageManager pkgMgr = context.getPackageManager();            try {                PackageInfo info = pkgMgr.getPackageInfo(packageName, PackageManager.GET_SIGNATURES);                if (info != null) {                    return info.signatures;                }            } catch (PackageManager.NameNotFoundException e) {                return null;            }        }        return null;    }    private static String getMessageDigest(byte[] buffer) {        char[] hexDigits = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};        try {            MessageDigest mdTemp = MessageDigest.getInstance("MD5");            mdTemp.update(buffer);            byte[] md = mdTemp.digest();            int j = md.length;            char[] str = new char[j * 2];            int k = 0;            for (byte byte0 : md) {                int k2 = k + 1;                str[k] = hexDigits[(byte0 >>> 4) & 15];                k = k2 + 1;                str[k2] = hexDigits[byte0 & 15];            }            return new String(str);        } catch (Exception e) {            return "";        }    }

以上方法参考微信开放平台的->获取安装到手机的第三方应用签名的apk包  源码

来源地址：https://blog.csdn.net/zhao8856234/article/details/131043672