官方提供的獲取散列秘鑰的代碼

    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);// 打印出來的HashKey就是秘鑰散列
            }
        } catch (Exception e) {
       }