在片段和片段对话框之间进行通信

Question

我研究了关于片段和片段对话框之间通信的 SO，我发现 setTargetFragment 和接口是一种方法。但是当我尝试 setTargetFragment 时出现此错误。

Fragment 类型中的方法 setTargetFragment(Fragment, int) 不适用于参数 (SettingsDetailsFragment, int)。直到现在我还没有使用片段，而且我是 android 的新手。 所以我有这个片段：

   public class SettingsDetailsFragment extends Fragment implements
        NoticeDialogFragment.EmailChangedListner {

        public void emailUpdateFromDialog()
        {
         DialogFragment modifyEmailFragment = new ModifyEmailFragment();
        //here is where i get the error
        modifyEmailFragment.setTargetFragment(this, 0);`enter code here`

        modifyEmailFragment.show(getActivity().getFragmentManager(),
            "email");
  }
}

  // class where i have the interface
  public class NoticeDialogFragment extends DialogFragment {
    public interface EmailChangedListner {
    public void emailChanged(String text);
  }

}

 // the dialogFragment
 public class ModifyEmailFragment extends DialogFragment {

   @Override
   public Dialog onCreateDialog(Bundle savedInstanceState) {
    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());

    // Get the layout inflater
    LayoutInflater inflater = getActivity().getLayoutInflater();

    // Inflate and set the layout for the dialog
    // Pass null as the parent view because its going in the dialog layout
    final View v_iew = inflater.inflate(R.layout.email_dialog, null);

    builder.setView(v_iew)

            // Add action buttons
            .setPositiveButton(R.string.modifyBtn_settings,
                    new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int id) {

                            EditText userEmail = (EditText) v_iew
                                    .findViewById(R.id.modifyEmail);
                            boolean validateEmail = BookMeUtils
                                    .validateEmail(userEmail.getText()
                                            .toString());

                            if (validateEmail == false) {
                                BookMeUtils.enterValidEmail(getActivity());
                            }

                            if (!(userEmail.getText().toString().length() == 0)) {

                                if (validateEmail == true) {
                                    Fragment parentFragment = getTargetFragment();
                                    ((EmailChangedListner) parentFragment)
                                            .emailChanged(userEmail
                                                    .getText().toString());
                                }
                            } else {

                            }
                        }
                    })
            .setNegativeButton(R.string.cancel_r,
                    new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int id) {
                            ModifyEmailFragment.this.getDialog().cancel();
                        }
                    });

    return builder.create();
}

}

Answer 1

您的片段将设置监听器并实现 EmailChangedListner ：

public class SettingsDetailsFragment extends Fragment implements
            EmailChangedListner {

            public void emailUpdateFromDialog()
            {
             DialogFragment modifyEmailFragment = new ModifyEmailFragment();        
            modifyEmailFragment.setListener(SettingsDetailsFragment.this);

            modifyEmailFragment.show(getActivity().getFragmentManager(),
                "email");
            }
       }

Dialog Fragment 将具有接口和侦听器对象：

// the dialogFragment
 public class ModifyEmailFragment extends DialogFragment {

   EmailChangedListner listener;

   public void setListener(EmailChangedListner listener) {
        this.listener = listener;
   }

   @Override
   public Dialog onCreateDialog(Bundle savedInstanceState) {
    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());

    // Get the layout inflater
    LayoutInflater inflater = getActivity().getLayoutInflater();

    // Inflate and set the layout for the dialog
    // Pass null as the parent view because its going in the dialog layout
    final View v_iew = inflater.inflate(R.layout.email_dialog, null);

    builder.setView(v_iew)

            // Add action buttons
            .setPositiveButton(R.string.modifyBtn_settings,
                    new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int id) {

                            EditText userEmail = (EditText) v_iew
                                    .findViewById(R.id.modifyEmail);
                            boolean validateEmail = BookMeUtils
                                    .validateEmail(userEmail.getText()
                                            .toString());

                            if (validateEmail == false) {
                                BookMeUtils.enterValidEmail(getActivity());
                            }

                            if (!(userEmail.getText().toString().length() == 0)) {

                                if (validateEmail == true) {
                                    Fragment parentFragment = getTargetFragment();
                                    listener.emailChanged(userEmail
                                                    .getText().toString());
                                }
                            } else {

                            }
                        }
                    })
            .setNegativeButton(R.string.cancel_r,
                    new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int id) {
                            ModifyEmailFragment.this.getDialog().cancel();
                        }
                    });

    return builder.create();
   }


  public interface EmailChangedListner {
    public void emailChanged(String text);
  }

}

Answer 2

检查Fragment 在您的SettingsDetailsFragment 类中的导入。是导入android.support.v4.app.Fragment还是android.app.Fragment。

可能是您将android.support.v4.app 的Fragment 设置为android.app 的DialogFragment 的目标。