toByteArray（）将无法解析的Facebook登录

Question

我正在构建一个应用程序，需要Facebook登录和身份验证。

我下面

https://developers.facebook.com/docs/android/getting-started#create-app

我得到这个错误：当我打的Facebook登录按钮：

多个帖子说，此代码应解决错误

Key hash doesn't match while facebook login in android

：

try { 
      PackageInfo info = getPackageManager().getPackageInfo(
        "com.hitup.hitup", 
        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) 
     { 

     } 

但是toByteArray（）方法不能得到解决！

我怎样才能解决这个错误，并实现我的应用程序的简单的Facebook登录？

Answer 1

您必须导入android.content.pm.Signature而不是java.security.Signature。

Answer 2

from Logcat you can get hash key of facebook please do copy from logcat which having Logcat tag "KeyHash" and put it in your project on developer.facebook site 

import android.content.pm.Signature; 

     try { 
     PackageInfo info = getPackageManager().getPackageInfo(
       **"do not forgot to 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) { 

    } 



OR 

1. for Android default keystore : add this to in your terminal 
  
keytool -exportcert -alias androiddebugkey -keystore ~/.android/debug.keystore | openssl sha1 -binary | openssl base64 

2. for signed keystore 

keytool -exportcert -alias aliasname -keystore keystorename | openssl sha1 -binary | openssl base64