如何从 Android 上保存的帐户中检索 Facebook-AuthToken
我正在尝试使用以下代码片段检索 Facebook 的 AuthToken（由 Facebook for Android 保存）。
AccountManager am = AccountManager.get(this);
Account[] accounts = am.getAccountsByType("com.facebook.auth.login");
if (accounts.length > 0) {
for(int j = 0; j < accounts.length; j++) {
Account account = accounts[j];
if(account.type != null && account.type.equals("com.facebook.auth.login")) {
Log.e(RuntimeVars.MY_NAME, "FACEBOOK-TYPE FOUND");
am.getAuthToken(account, "com.facebook.auth.login", null, ConversationList.this,
new AccountManagerCallback<Bundle>() {
public void run(AccountManagerFuture<Bundle> arg0) {
try {
Bundle b = arg0.getResult();
Log.e(RuntimeVars.MY_NAME, "THIS AUTHTOKEN: " + b.getString(AccountManager.KEY_AUTHTOKEN));
}
catch (Exception e) {
Log.e(RuntimeVars.MY_NAME, "EXCEPTION@AUTHTOKEN");
}
}
}, null);
}
}
}
找到登录凭据，并且将FACEBOOK-TYPE FOUND写入LogCat，但THIS AUTHTOKEN：[...]和EXCEPTION@AUTHTOKEN都没有已记录。所以我想永远不会调用 am.getAuthToken 。
我缺少什么？
一般来说，如果有更好（并且至少有效）的方法从 Android 帐户检索 Facebook authtoken，请告诉我。
非常感谢您的帮助！
最好的问候
S。
I'm trying to retrieve the AuthToken for Facebook (saved by Facebook for Android) by using the following piece of code.
AccountManager am = AccountManager.get(this);
Account[] accounts = am.getAccountsByType("com.facebook.auth.login");
if (accounts.length > 0) {
for(int j = 0; j < accounts.length; j++) {
Account account = accounts[j];
if(account.type != null && account.type.equals("com.facebook.auth.login")) {
Log.e(RuntimeVars.MY_NAME, "FACEBOOK-TYPE FOUND");
am.getAuthToken(account, "com.facebook.auth.login", null, ConversationList.this,
new AccountManagerCallback<Bundle>() {
public void run(AccountManagerFuture<Bundle> arg0) {
try {
Bundle b = arg0.getResult();
Log.e(RuntimeVars.MY_NAME, "THIS AUTHTOKEN: " + b.getString(AccountManager.KEY_AUTHTOKEN));
}
catch (Exception e) {
Log.e(RuntimeVars.MY_NAME, "EXCEPTION@AUTHTOKEN");
}
}
}, null);
}
}
}
The login credentials are found and FACEBOOK-TYPE FOUND is written into LogCat, but neither THIS AUTHTOKEN: [...] nor EXCEPTION@AUTHTOKEN is logged. So I suppose am.getAuthToken is never called.
What am I missing?
In general, if there is a better (and at least working) approach to retrieve the Facebook authtoken from the Android accounts please let me know.
Thanks a lot for your help!
Best regards
S.
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评论（4）
为什么不使用 Facebook SDK？
其中的
Facebook类有一个用于获取 OAuth 2.0 访问令牌（如果您需要的话）的成员getAccessToken()。Why not use the Facebook SDK?
The
Facebookclass in it has a member to get the OAuth 2.0 access token (if that is what you need),getAccessToken().为了解释两个日志语句均未到达的事实，请考虑：
第 ~8 行：
... 如果令牌立即可用，则可以返回令牌。也许这就是您正在寻找的答案？引用AccountManager文档：
To explain the fact that neither of your logging statements are being reached, consider:
Line ~8:
... can return a token if it's immediately available. Maybe that's the answer you're looking for? Quoting the AccountManager documentation:
请尝试调用
AccountManager.blockingGetAuthToken。如果有效，那么这里有一些更有趣的问题......另外，请确保您的清单具有正确的
USE_CREDENTIALS权限设置。Try calling
AccountManager.blockingGetAuthTokeninstead. If that works, then there's something more interesting at fault here...Also, make sure your manifest has the
USE_CREDENTIALSpermission set correctly.在 am.getAuthToken 之前添加 try { 并在此方法声明结束处捕获异常。这将告诉您异常发生的原因和位置
add try { before am.getAuthToken and catch Exception where this method declaration ends.This will give you why and where excepption is happening