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我在我的應用程序中執行了Facebook登錄實施。因此，代碼第一次從Facebook上檢索用戶詳細信息時工作，但是當我第二次使用fb登錄時，oncancel部分被執行，如果我清除應用程序數據並再次使用fb登錄，則再次運行它。Android Facebook集成問題（fb sdk 4）
這是我用Facebook註冊應用程序的代碼。
protected void Registerwithfb()
{
// TODO Auto-generated method stub
callbackManager = CallbackManager.Factory.create();
LoginManager.getInstance().logInWithReadPermissions(this, Arrays.asList("public_profile,user_about_me, email, user_birthday, user_friends"));
LoginManager.getInstance().registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
@Override
public void onSuccess(LoginResult result) {
// TODO Auto-generated method stub
// TODO Auto-generated method stub
if (AccessToken.getCurrentAccessToken() != null) {
GraphRequest request = GraphRequest.newMeRequest(result.getAccessToken(), new GraphRequest.GraphJSONObjectCallback() {
@Override
public void onCompleted(JSONObject object, GraphResponse response) {
// TODO Auto-generated method stub
JSONObject json = response.getJSONObject();
try {
if (json != null) {
String name = json.getString("name");
String id = json.getString("id");
}
} catch (JSONException e) {
e.printStackTrace();
}
}
});
Bundle parameters = new Bundle();
parameters.putString("fields", "name,email,first_name,last_name");
// Toast.makeText(getApplicationContext(), parameters.toString(), Toast.LENGTH_LONG).show();
request.setParameters(parameters);
request.executeAsync();
}
}
@Override
public void onCancel() {
// TODO Auto-generated method stub
System.out.println("cancelled");
}
@Override
public void onError(FacebookException error) {
// TODO Auto-generated method stub
System.out.println(error);
}
});
}
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
//super.onActivityResult(requestCode, resultCode, data);
// facebook.authorizeCallback(requestCode, resultCode, data);
//callbackManager.onActivityResult(requestCode, resultCode,data);
super.onActivityResult(requestCode, resultCode, data);
callbackManager.onActivityResult(requestCode, resultCode, data);
}