如果不能从 FragmentActivity 扩展，如何在 MainActivity 中监听 Fragment Dialog 的点击？

Question

我试图在我的应用程序中显示一个初始对话框，以便用户接受条款和条件以及隐私政策，从那里在 SharedPreferences 中设置一个变量。

我已按照 steps here 将对话事件传递给主持人，在本例中为 MainActivity。

对话框创建正常，但在 Fragment 上仍能听到点击声，在主机上听不到。

与我的代码唯一不同的是，在 Android 示例中，MainActivity 是从 FragmentActivity:

public class MainActivity extends FragmentActivity implements NoticeDialogFragment.NoticeDialogListener{

在我的情况下我不能这样做，因为我的 MainActivity 已经从 AppCompatActivity 扩展了。

如何监听 MainActivity 中 FragmentDialog 的点击？

这是我的代码：

MainActivity

@AndroidEntryPoint
public class MainActivity extends AppCompatActivity  implements AcceptFragment.AcceptDialogListener
        {

            public void showNoticeDialog() {
                // Create an instance of the dialog fragment and show it
                DialogFragment dialog = new AcceptFragment();
                dialog.show(getSupportFragmentManager(), "NoticeDialogFragment");
            }

            // The dialog fragment receives a reference to this Activity through the
            // Fragment.onAttach() callback, which it uses to call the following methods
            // defined by the NoticeDialogFragment.NoticeDialogListener interface
            @Override
            public void onDialogPositiveClick(DialogFragment dialog) {
                //I have debugged and it does not enter here
                String a="s";
                // User touched the dialog's positive button
        //...
            }

            @Override
            public void onDialogNegativeClick(DialogFragment dialog) {
                //I have debugged and it does not enter here
                String a="s";

                // User touched the dialog's negative button
        //...
            }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        showNoticeDialog();
    }

// ...
}

---

AcceptFragment

这是 FragmentDialog 的代码。在调试中，正在 class 中监听点击，而不是 MainActivity:

public class AcceptFragment extends DialogFragment {

    @NonNull
    @Override
    public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        // Get the layout inflater
        LayoutInflater inflater = requireActivity().getLayoutInflater();

        // Inflate and set the layout for the dialog
        // Pass null as the parent view because its going in the dialog layout
        builder.setView(inflater.inflate(R.layout.dialog_signin, null))
                // Add action buttons
                .setPositiveButton("R.string.signin", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int id) {
                        //Clicks are received here
                        String a="s";
                        // sign in the user ...
                    }
                })
                .setNegativeButton("R.string.cancel", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                        //Or clicks are received here
                        String a="s";
                        AcceptFragment.this.getDialog().cancel();
                    }
                });
        return builder.create();

    }

    public static String TAG = "AcceptFragment";

    public interface AcceptDialogListener {
        public void onDialogPositiveClick(DialogFragment dialog);
        public void onDialogNegativeClick(DialogFragment dialog);
    }

    // Use this instance of the interface to deliver action events
    AcceptDialogListener listener;

    // Override the Fragment.onAttach() method to instantiate the NoticeDialogListener
    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        // Verify that the host activity implements the callback interface
        try {
            // Instantiate the NoticeDialogListener so we can send events to the host
            listener = (AcceptDialogListener) context;
        } catch (ClassCastException e) {
            // The activity doesn't implement the interface, throw exception
            throw new ClassCastException(getActivity().toString()
                    + " must implement NoticeDialogListener");
        }
    }


}

Answer 1

This is the code for the FragmentDialog. In the debug the clicks are being listened to in this class, not in MainActivity:

您似乎没有调用您的侦听器。

.setPositiveButton("R.string.signin", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int id) {
                    //Clicks are received here
                    String a="s";
                    // sign in the user ...

                    // INVOKE LISTENER
                    listener.onPositiveButtonClick(...);
                }
            })
            .setNegativeButton("R.string.cancel", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    //Or clicks are received here
                    String a="s";
                    AcceptFragment.this.getDialog().cancel();

                    // INVOKE LISTENER
                    listener.onNegativeButtonClick(...);
                }
            });