Fragment getActivity() 中的 Android AlertDialog Builder 不起作用

Question

我试图在片段中构建一个警报对话框，但我找不到AlertDialog构建器的正确上下文。

public class LoginFragment extends Fragment {
public LoginFragment() {
    // Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.fragment_login, container, false);
    Button btnEnter = (Button) rootView.findViewById(R.id.btnEnter);
    // Listening to register new account link
    btnEnter.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
        // if play name already exists
            AlertDialog dialog = new AlertDialog.Builder(getActivity())
                .setCancelable(false)
                .setIcon(R.drawable.login_icon)
                .setMessage("Player Name Already Exists. Please Find a New Name.")
                .setButton("Okay", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.dismiss();
                    }
            }).show();
        }
    });
    return rootView;
}
@Override
public void onAttach(Activity activity) {
    super.onAttach(activity);
}
@Override
public void onDetach() {
    super.onDetach();
}

}

在这一行中：

AlertDialog dialog = new AlertDialog.Builder(getActivity());

getActivity（） 不起作用。它说"需要AlertDialog，找到AlertDialog.Builder"。我尝试过像这样的东西.getActivity（）和getContext（）和getSupportFragmentManager（），所有这些都不起作用。我对此有点困惑。有人可以告诉我应该使用哪个以及为什么吗？

Answer 1

AlertDialog dialog = new AlertDialog.Builder(getActivity());

应替换为

AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());

Answer 2

这是一个自定义对话框，因此只需按照您喜欢的方式进行编辑即可。

在片段中使用对话框的示例：

AlertDialog.Builder makeDialog = new AlertDialog.Builder(getActivity());
            LayoutInflater li = getLayoutInflater(null);
            View viewAdd = li.inflate(R.layout.random_dialog, null);
            makeDialog.setView(viewAdd);
            //editexts,textviews and that stuff goes here
            makeDialog.setPositiveButton("Save", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {


                }
            });
            makeDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    dialog.cancel();
                }
            });
            AlertDialog ad = makeDialog.create();
            ad.show();