Android Facebook登录接入--散列秘钥获取

官方提供的获取散列秘钥的代码

    try {
            PackageInfo info = getPackageManager().getPackageInfo(getPackageName(), PackageManager.GET_SIGNATURES);
            for (android.content.pm.Signature signature : info.signatures) {
                MessageDigest md = MessageDigest.getInstance("SHA");
                md.update(signature.toByteArray());
                String KeyHash = Base64.encodeToString(md.digest(), Base64.DEFAULT);
                Log.e("HashKey=========", KeyHash);// 打印出来的HashKey就是秘钥散列
            }
        } catch (Exception e) {
       }