Question

我收到错误...

错误：错误：此片段应提供默认构造函数（不带参数的公共构造函数）（com.jdpm.pmn.perfectmaterialnotes.fragments.NoteEditDialogFragment）[ValidFragment]

public class NoteEditDialogFragment extends DialogFragment implements OnClickListener{




private EditText mTitleText;
private EditText mBodyText;
private Long mRowId = null;
private NotesDbAdapter mDbHelper;
private boolean newNote = true;
private Spinner mCategorySpinner;
private String noteText = "";
private Button mSaveButton;
private Button mCancelButton;


public NoteEditDialogFragment(boolean b) {
    this.newNote = b;
}

public static NoteEditDialogFragment newInstance(boolean b) {
    return new NoteEditDialogFragment(b);
}

public static NoteEditDialogFragment newInstance() {
    return new NoteEditDialogFragment(true);
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setStyle(DialogFragment.STYLE_NO_FRAME, R.style.Theme_Rymatenotes_Dialog);
    mDbHelper = new NotesDbAdapter(this.getActivity());
    mDbHelper.open();

如何更改错误信息？

public NoteEditDialogFragment(boolean b) {
    this.newNote = b;
}

public static NoteEditDialogFragment newInstance(boolean b) {
    return new NoteEditDialogFragment(b);
}

public static NoteEditDialogFragment newInstance() {
    return new NoteEditDialogFragment(true);
}

Answer 1

添加一个不带参数的默认构造函数：

public NoteEditDialogFragment() {
    this.newNote = true;
}

您的应用程序逻辑取决于您将变量初始化为什么默认值，但由于您在调用newInstance时将newNote设置为true，因此我认为true是合理的默认值。

What is a constructor?

androidstudio构造函数错误

1 个答案: