问题描述
我知道这个问题已经被问了一百万遍了,但是我已经尝试了所有可以找到的解决方案,但仍然没有用.我试过为上下文调用"this",试过了getActivity,试过了getContext(),但似乎没有什么特别适合此片段.相同的代码确实可以在不同的片段中工作,这就是为什么我真的很困惑.任何帮助表示赞赏.
I know this question has been asked a million times before, but I have tried all of the solutions I can find, and still doesn't work. I have tried calling "this" for context, I have tried getActivity, I have tried getContext(), but nothing seems to work for this fragment in particular. The same code does work in a different fragment tho, which is why I am really confused. Any help appreciated.
我的LoginFragment,我的问题可以在setReservations()中找到:
My LoginFragment, my issue can be found in setReservations():
public class LoginFragment extends Fragment {
LoginButton loginButton;
TextView nameText;
ProfileTracker mProfileTracker;
DBHandler dbHandler;
Context context;
ArrayList<Reservation> reservations;
ListView lv;
Profile fbProfile;
CallbackManager callbackManager;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.login, container, false);
callbackManager = CallbackManager.Factory.create();
dbHandler = new DBHandler(getContext(), null, null, 1);
context = getActivity();
loginButton = (LoginButton) view.findViewById(R.id.login_button);
nameText = (TextView) view.findViewById(R.id.users_name);
loginButton.setReadPermissions("email");
setmProfileTracker();
mProfileTracker.startTracking();
// If using in a fragment
loginButton.setFragment(this);
// Other app specific specialization
// Callback registration
loginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
@Override
public void onSuccess(LoginResult loginResult) {
}
@Override
public void onCancel() {
// App code
}
@Override
public void onError(FacebookException exception) {
// App code
}
});
return view;
}
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
fbProfile = Profile.getCurrentProfile();
if (fbProfile != null)
{
updateUI();
}
getActivity().setTitle("My page");
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
callbackManager.onActivityResult(requestCode,resultCode,data);
}
private void setmProfileTracker()
{
mProfileTracker = new ProfileTracker() {
@Override
protected void onCurrentProfileChanged(Profile profile, Profile profile2) {
updateUI(); //this is the third piece of code I will discuss below
}
};
}
private void updateUI() {
boolean enableButtons = AccessToken.getCurrentAccessToken() != null;
if (fbProfile == null) {
fbProfile = Profile.getCurrentProfile();
Log.e("Profile", "null");
}
if (enableButtons && fbProfile != null) {
Log.e("Access Token", AccessToken.getCurrentAccessToken().toString());
nameText.setText(fbProfile.getName());
}
}
private void setReservations()
{
reservations = dbHandler.userReservationToArrayList(parseLong(fbProfile.getId()));
lv = (ListView) getView().findViewById(R.id.reservations);
ArrayAdapter<Review> arrayAdapter = new ArrayAdapter<Review>(
context,
android.R.layout.simple_list_item_1,
reservations);
lv.setAdapter(arrayAdapter);
}
}
代码格式
推荐答案
您可能应该了解有关泛型和类型安全性的更多信息.
You probably should learn more about generics and type safety.
您的reservations
具有类型ArrayList<Reservation>
,但是您尝试创建ArrayAdapter<Review>
,这是错误的.将其更改为ArrayAdapter<Reservation>
.
Your reservations
has type ArrayList<Reservation>
but you try to create ArrayAdapter<Review>
which is wrong. Change it to ArrayAdapter<Reservation>
.
这篇关于无法解析构造函数ArrayAdapter(android.Content.Context,int,java.util.ArrayList< MyObject>)的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!