Android ApiDemos 学习——时间日期控件

时间日期进程会用到平时的开发中，android内置了两种可交互的时间日期控件，一种是对话框形式的，一种是内嵌式的。

分别使用了android的类TimePickerDialog、DatePickerDialog以及TimePicker，其中TimePicker需要在layout中进行设置

对话框形式的时间控件

public class DateDialog extends Activity {

    // where we display the selected date and time
    private TextView mDateDisplay;

    // date and time
    private int mYear;
    private int mMonth;
    private int mDay;
    private int mHour;
    private int mMinute;

    static final int TIME_DIALOG_ID = 0;
    static final int DATE_DIALOG_ID = 1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.date_widgets_example_1);

        mDateDisplay = (TextView) findViewById(R.id.dateDisplay);

        Button pickDate = (Button) findViewById(R.id.pickDate);
        pickDate.setOnClickListener(new View.OnClickListener() {

            public void onClick(View v) {
                showDialog(DATE_DIALOG_ID);
            }
        });

        Button pickTime = (Button) findViewById(R.id.pickTime);
        pickTime.setOnClickListener(new View.OnClickListener() {

            public void onClick(View v) {
                showDialog(TIME_DIALOG_ID);
            }
        });

        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 TIME_DIALOG_ID:
                return new TimePickerDialog(this,
                        mTimeSetListener, mHour, mMinute, false);
            case DATE_DIALOG_ID:
                return new DatePickerDialog(this,
                            mDateSetListener,
                            mYear, mMonth, mDay);
        }
        return null;
    }

    @Override
    protected void onPrepareDialog(int id, Dialog dialog) {
        switch (id) {
            case TIME_DIALOG_ID:
                ((TimePickerDialog) dialog).updateTime(mHour, mMinute);
                break;
            case DATE_DIALOG_ID:
                ((DatePickerDialog) dialog).updateDate(mYear, mMonth, mDay);
                break;
        }
    }    

    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)));
    }

    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();
                }
            };

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

内嵌式时间控件

public class DateIncline extends Activity {

    // where we display the selected date and time
    private TextView mTimeDisplay;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.date_widgets_example_2);

        TimePicker timePicker = (TimePicker) findViewById(R.id.timePicker);
        timePicker.setCurrentHour(12);
        timePicker.setCurrentMinute(15);

        mTimeDisplay = (TextView) findViewById(R.id.dateDisplay);

        updateDisplay(12, 15);

        timePicker.setOnTimeChangedListener(new TimePicker.OnTimeChangedListener() {

            public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {
                updateDisplay(hourOfDay, minute);
            }
        });
    }

    private void updateDisplay(int hourOfDay, int minute) {
        mTimeDisplay.setText(
                    new StringBuilder()
                    .append(pad(hourOfDay)).append(":")
                    .append(pad(minute)));
    }

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

}

Android ApiDemos 学习——时间日期控件