[英]Facebook log in on Android device not working, but works in Android Studio Emulator
[英]Android Studio: Facebook Log in
我正在尝试为Android Studio开发一个非常基本的Facebook登录程序。 我遵循了所有步骤,至少与至少4个教程中所述完全相同,但是结果仍然相同。 当我打开应用程序时,它崩溃了。 所以这是我的代码:
private FacebookCallback<LoginResult> mCallBack = new FacebookCallback<LoginResult>(){
@Override
public void onSuccess(LoginResult loginResult) {
AccessToken accessToken = loginResult.getAccessToken();
Profile profile = Profile.getCurrentProfile();
if(profile!=null){
textlogin.setText("Hello "+profile.getFirstName());
}
}
@Override
public void onCancel() {
// App code
}
@Override
public void onError(FacebookException exception) {
// App code
}
};
@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
FacebookSdk.sdkInitialize(getActivity().getApplicationContext());
callbackManager=CallbackManager.Factory.create();
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
LoginButton loginButton = (LoginButton)view.findViewById(R.id.login_button);
textlogin = (TextView)view.findViewById(R.id.textView);
loginButton.setReadPermissions("user_friends");
loginButton.setFragment(this);
loginButton.registerCallback(callbackManager, mCallBack);
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode,resultCode,data);
callbackManager.onActivityResult(requestCode,resultCode,data);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_main, container, false);
}
这是错误日志(实际上就是这么短):
java.lang.NullPointerException
at java.util.concurrent.ConcurrentHashMap.containsKey(ConcurrentHashMap.java:911)
at com.facebook.internal.Utility.queryAppSettings(Utility.java:802)
at com.facebook.login.widget.LoginButton$1.run(LoginButton.java:509)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:841)
发现错误。 错误放置了<Metadata>
。 现在都在工作!
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