单击“确定”时 EditTexts 始终为空

Question

当我单击确定时，字符串 returned 总是空字符串 ""。他们不是，问题可能是对话框创建了两次，所以他们指的不是同一个 EditTexts?

package com.example.gaetano.notebook;


public class AddNoteFragment extends DialogFragment`enter code here`{

public EditText title;
public EditText note;
public OnNoteAdded noteAdded;

public interface OnNoteAdded {
    void onNoteAdded(Note note);
}

@Override
public void onAttach(Activity activity) {
    super.onAttach(activity);
    noteAdded = (OnNoteAdded) activity;
}

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

    LayoutInflater inflater = getActivity().getLayoutInflater();
    View rootView = inflater.inflate(R.layout.fragment_add_note, null);

    title = (EditText) rootView.findViewById(R.id.edTitle);
    note = (EditText) rootView.findViewById(R.id.edNote);

    builder.setTitle("Add a new note");
    builder.setView(inflater.inflate(R.layout.fragment_add_note, null))
            .setPositiveButton(R.string.add_note, new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int id) {
                    String t = title.getText().toString();
                    String n = note.getText().toString();

                    Note note = new Note(t, n , false);
                    noteAdded.onNoteAdded(note);
                }
            })
            .setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    AddNoteFragment.this.getDialog().cancel();
                }
            });
    return builder.create();
}

单击“确定”时，EditTexts 始终为空“”。

View rootView = inflater.inflate(R.layout.fragment_add_note, null);

title = (EditText) rootView.findViewById(R.id.edTitle);
note = (EditText) rootView.findViewById(R.id.edNote);

然后在我的 setPositiveButton, OnClick 方法中我得到了这些文本的字符串。通过这样做 String t = title.getText().toString(); String n = note.getText().toString(); 他们总是return""

在 MainActivity 中，我然后像这样实现接口 @Override public void onNoteAdded(Note note) { noteAdapter.add(note); }

Answer 1

根据 Layout Inflater API，Inflater 的 inflate() 方法 returns 一个 View 对象。您可以将此 View 对象的 reference 保存在一个变量中，它将充当 Dialog 的 screen.Using 此 root view 的 root view，您可以找到所有此 root view's tree 中包含的子视图或简称为使用 findViewById() 的此根视图的子视图。

这是 onCreateDialog() 的片段：-

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

LayoutInflater inflater = getActivity().getLayoutInflater();
View rootView=inflater.inflate(R.layout.fragment_add_note, null)
Button mydialogbutton=(Button) rootView.findViewById(R.id.my_dialog_button);
            //Button is exemplary but this is how you can access any child component of the root view

builder.setTitle("Add a new note");
builder.setView(rootView)
.setPositiveButton(R.string.add_note, new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int id) {
        Note newNote = new Note(
            "hey",
            "notehey",
            false);
        noteAdded.onNoteAdded(newNote);
    }
})
.setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
    public void onClick(DialogInterface dialog, int id) {
        AddNoteFragment.this.getDialog().cancel();
    }
});
return builder.create();

视图的创建和引用过程与onCreateView()相同。正如在 onCreateDialog() 和 onCreateView() 中一样，您正在使用 Layout Inflater 来获取对 View 对象的引用。

单击“确定”时 EditTexts 始终为空

EditTexts are always empty when clicking OK

java

android

android-dialogfragment