Android Fragment getActivity() 中的 AlertDialog Builder 不工作

Question

我尝试在 Fragment 中构建 AlertDialog，但找不到适合 AlertDialog Builder 的上下文。

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();
}

}

这一行：

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

getActivity() 无效。它说 "require AlertDialog, found AlertDialog.Builder"。我试过 this.getActivity() 和 getContext() 以及 getSupportFragmentManager() 之类的东西，但都没有用。我对此有点困惑。谁能告诉我应该使用哪个以及为什么？

Answer 1

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

应替换为

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

Answer 2

这是自定义对话框，您可以随意编辑它。

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();

Android Fragment getActivity() 中的 AlertDialog Builder 不工作

Android AlertDialog Builder in a Fragment getActivity() not work

android

builder

fragment

android-alertdialog