无法从自定义对话框片段中获取布局元素

Question

我有一个自定义对话框片段，其中包含2个编辑文本字段，一个用于电子邮件，另一个用于密码。我还为对话框片段创建了一个自定义侦听器，以便将数据传递给另一个活动。问题是没有数据传递，当我记录值时，没有任何数据显示。 R.layout.dialog_signin是我对话框的自定义布局。

以下是Dialog Fragment的代码：

public class LoginDialogFragment extends DialogFragment {

    public interface LoginDialogListener {
        public void onDialogSigninClick(DialogFragment dialog);
    }

    LoginDialogListener mListener;

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

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        // Get the layout inflater
        LayoutInflater inflater = getActivity().getLayoutInflater();
        builder.setTitle("Log In");


        // 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("Sign In", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int id) {
                        // sign in the user ...
                        mListener.onDialogSigninClick(LoginDialogFragment.this);

                    }
                })
                .setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                        LoginDialogFragment.this.getDialog().cancel();
                    }
                });
        return builder.create();
    }
}

以下是我在用户点击＆＃34;登录＆＃34;时收听的代码。按钮。我正在使用布局inflater，所以我可以抓取用户在电子邮件和密码字段中键入的字符串，但问题是字符串是空白的，我甚至无法记录该值，它没有＆＃39; t出现在日志中。

@Override
    public void onDialogSigninClick(DialogFragment dialog) {
        // User touched the dialog's positive button
        LayoutInflater inflater = (LayoutInflater) this
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        final View myView = inflater.inflate(R.layout.dialog_signin, null);
        final EditText username = (EditText) myView.findViewById(R.id.username);
        final EditText password = (EditText) myView.findViewById(R.id.password);
        System.out.println(username.getText()); //this doesn't show up in the log at all
        String usernameText = username.getText().toString();
        String passwordText = password.getText().toString();
        Intent i = new Intent(this, GSSAct.class);
        //as a result no data is passed to the activity
        i.putExtra("username", usernameText);
        i.putExtra("password", passwordText);
        startActivity(i);
    }

Answer 1

我解决了我的问题，使其更加混乱;我所做的就是为onDialogSigninClick方法添加参数。

我的新对话代码：

public class LoginDialogFragment extends DialogFragment {

    public interface LoginDialogListener {
        public void onDialogSigninClick(DialogFragment dialog, String username, String password);
    }

    LoginDialogListener mListener;

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

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

        // Get the layout inflater
        LayoutInflater inflater = getActivity().getLayoutInflater();
        final View v = inflater.inflate(R.layout.dialog_signin, null);
        builder.setTitle("Log In");
        final EditText u = (EditText)v.findViewById(R.id.username22);
        final EditText p = (EditText)v.findViewById(R.id.password22);

        // Inflate and set the layout for the dialog
        // Pass null as the parent view because its going in the dialog layout
        builder.setView(v)
                // Add action buttons
                .setPositiveButton("Sign In", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int id) {
                        // sign in the user ...
                        mListener.onDialogSigninClick(LoginDialogFragment.this, u.getText().toString(), p.getText().toString());
                    }
                })
                .setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                        LoginDialogFragment.this.getDialog().cancel();
                    }
                });
        return builder.create();
    }
}

我在片段附加到的活动中的代码：

@Override
public void onDialogSigninClick(DialogFragment dialog, String username, String password) {
        // User touched the dialog's positive button
        //LayoutInflater inflater = getLayoutInflater();
        System.out.println("I am in the dialog.");
        //View myView = inflater.inflate(R.layout.dialog_signin, null);
        //EditText username2 = (EditText) myView.findViewById(R.id.username22);
        //EditText password2 = (EditText) myView.findViewById(R.id.password22);
        String usernameText = username;
        String passwordText = password;
        System.out.println("The username is:" + usernameText);
        Intent i = new Intent(this, GSSAct.class);
        i.putExtra("username", usernameText);
        i.putExtra("password", passwordText);
        startActivity(i);
    }