Android:在对话框中使用日期选择器和时间选择器

Question

我遇到了一个我不知道如何解决的问题。

我有一个 Activity ，当我单击链接到该 Activity 的菜单的特定项目时，会显示一个对话框并用于添加项目。这个项目有一个日期和时间，但我没有设法在这个对话框中有一个 DatePicker 和 TimePicker。我还尝试将 Activity 传递给对话框并使用这个来显示 DatePicker, 但这不起作用。在此之前，我在另一个 Activity 中处理了此类项目的创建。在这种情况下，它工作正常。但我发现 Dialog 更性感……:-)你有什么想法吗？希望我不会太困惑......非常感谢，

我编辑这篇文章是为了分享我遇到困难的代码。

我有一个基本的 Dialog 类试图使用 DatePicker 和 TimePicker。 基本上，Eclipse 提示说:

• showDialog 未定义 View.OnClickListener()
• onCreateDialog 方法: EventCreateDialog 类型的方法 onCreateDialog(int) 必须覆盖或实现父类(super class)型方法
• DatePickerDialog 未定义(因为这不是 Activity )

所有这些东西都在 Activity 中工作，但我不能让它在 Dialog 中工作。

非常感谢，

打包 com.android.myapp;

public class TestDialog extends Dialog implements android.view.View.OnClickListener {
    static final int DATE_DIALOG_ID = 0;
    static final int TIME_DIALOG_ID = 1;
    private TextView mDateDisplay;
    private Button mPickDate;
    private Button mPickTime;
    private int mYear;
    private int mMonth;
    private int mDay;
    private int mHour;
    private int mMinute;
    private Button mButton_ok;
    private Button mButton_ko;

    private ReadyListener readyListener;

    private Context context;
    // the callback received when the user "sets" the date in the dialog
    private DatePickerDialog.OnDateSetListener mDateSetListener =
            new DatePickerDialog.OnDateSetListener() {
                public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
                    mYear = year;
                    mMonth = monthOfYear;
                    mDay = dayOfMonth;
                    updateDisplay();
                }
            };
    private TimePickerDialog.OnTimeSetListener mTimeSetListener =
            new TimePickerDialog.OnTimeSetListener() {
                public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
                    mHour = hourOfDay;
                    mMinute = minute;
                    updateDisplay();
                }
            };

    public TestDialog(Context context, ReadyListener readyListener) {
        super(context);
        this.context = context;
        this.readyListener = readyListener;
    }

    private static String pad(int c) {
        if (c >= 10)
            return String.valueOf(c);
        else
            return "0" + String.valueOf(c);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.event_create);

        mButton_ok = (Button) findViewById(R.id.button_ok);
        mButton_ko = (Button) findViewById(R.id.button_ko);

        // Add listeners
        mButton_ok.setOnClickListener(this);
        mButton_ko.setOnClickListener(this);

        mDateDisplay = (TextView) findViewById(R.id.dateDisplay);
        mPickDate = (Button) findViewById(R.id.pickDate);
        mPickTime = (Button) findViewById(R.id.pickTime);
        // add a click listener to the button
        mPickDate.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                showDialog(DATE_DIALOG_ID);
            }
        });
        mPickTime.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                showDialog(TIME_DIALOG_ID);
            }
        });
        // get the current date
        final Calendar c = Calendar.getInstance();
        mYear = c.get(Calendar.YEAR);
        mMonth = c.get(Calendar.MONTH);
        mDay = c.get(Calendar.DAY_OF_MONTH);
        mHour = c.get(Calendar.HOUR_OF_DAY);
        mMinute = c.get(Calendar.MINUTE);
        updateDisplay();
    }

    @Override
    protected Dialog onCreateDialog(int id) {
        switch (id) {
            case DATE_DIALOG_ID:
                return new DatePickerDialog(this, mDateSetListener, mYear, mMonth, mDay);
            case TIME_DIALOG_ID:
                return new TimePickerDialog(this, mTimeSetListener, mHour, mMinute, false);
        }
        return null;
    }

    private void updateDisplay() {
        mDateDisplay.setText(
                new StringBuilder()
                        // Month is 0 based so add 1
                        .append(mMonth + 1).append("-")
                        .append(mDay).append("-")
                        .append(mYear).append(" ")
                        .append(pad(mHour)).append(":")
                        .append(pad(mMinute)));
    }

    @Override
    public void onClick(View v) {
        if (v == mButton_ok) {
            // Do stuff....
        }
        if (v == mButton_ko) {
            dismiss();
        }
    }

    public interface ReadyListener {
        public void ready(MyObj myObj);
    }
}

Answer 1

这是我的工作原理:

public class EditRecordDialog extends Dialog {
  protected Context _context;
  private   Record  _record;

  public EditRecordDialog( Context context,
                           Record  record ) {
    super( context );
    _context = context;
    _record  = record
    Button buttonDate;
    buttonDate.setText( _record.getRecordDate() ); // returns 'mm-dd-yy'

  } // EditRecordDialog


// showDatePickerDialog ++++++++++++++++++++++++++++++++++++++++++++++++++++++
private void showDatePickerDialog( View view ) {
  String dateString;
  int    year, month, day;

  dateString = buttonDate.getText().toString();
  month = Integer.valueOf( dateString.substring( 0, 2 ) ) - 1; // month is zero based
  day   = Integer.valueOf( dateString.substring( 3, 5 ) );
  year  = Integer.valueOf( "20" + dateString.substring( 6, 8 ) );

  DatePickerDialog dpd = new DatePickerDialog( _context, dateSetListener, year, month, day );
  dpd.show();

} // showDatePickerDialog ----------------------------------------------------


// OnDateSetListener +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
DatePickerDialog.OnDateSetListener dateSetListener = new DatePickerDialog.OnDateSetListener() {
  @Override public void onDateSet( DatePicker view, int year, int month, int day ) {
    buttonDate.setText( ConfigObjectDAO.formatDate( (month+1) + "-" + day + "-" + year ) );
  } // onDateSet
}; // OnDateSetListener ------------------------------------------------------
}