安卓通过代码获取faceBook的Key Hash



private void facebookHashKey() {

        try {
            PackageInfo info = getPackageManager().getPackageInfo("your.package.name", PackageManager.GET_SIGNATURES);
            for (Signature signature : info.signatures) {
                MessageDigest md = MessageDigest.getInstance("SHA");
                md.update(signature.toByteArray());
                Log.d("KeyHash:", Base64.encodeToString(md.digest(), Base64.DEFAULT));
            }
        } catch (NameNotFoundException e) {

        } catch (NoSuchAlgorithmException e) {

        }
    }

错误的话添加相应的头文件

注：用签名的包，如果未签名要会返回一个假的keyHash