Android：在对话框中使用日期选择器和时间选择器
我面临着一个我不知道如何解决的问题。
我有一个活动，当我点击链接到此活动的菜单中的特定项目时，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 。 我也尝试将活动传递给对话框，并使用这个来显示DatePicker,但这不起作用。 在此之前，我在另一项活动中处理了这些项目的创建。 在这种情况下，它工作正常。 但是我发现Dialog更性感...... :-)你有什么想法吗？ 希望我不会太困惑.....非常感谢，
我编辑这篇文章来分享我遇到的困难。
我有一个基本的Dialog类，试图使用DatePicker和TimePicker. 基本上， Eclipse抱怨说：
showDialog未定义为View.OnClickListener() onCreateDialog方法： EventCreateDialog类型的onCreateDialog(int)方法必须覆盖或实现超类型方法 DatePickerDialog是未定义的（因为这不是一个活动） 所有这些东西都是在一个Activity内工作的，但我无法通过一个Dialog工作。
非常感谢，
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);
}
}
以下是我的工作原理：
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 ------------------------------------------------------
}
PickerViewSample.java
package com.sai.samples.views;
import java.util.Calendar;
import android.app.Activity;
import android.app.DatePickerDialog;
import android.app.Dialog;
import android.app.TimePickerDialog;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.TextView;
import android.widget.TimePicker;
public class PickerViewSample extends Activity {
static final int DATE_DIALOG_ID = 1;
static final int TIME_DIALOG_ID = 2;
private TextView dateDisplay;
private Button pickDate;
private int year, month, day;
private TextView timeDisplay;
private Button pickTime;
private int hours, min;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
dateDisplay = (TextView)findViewById(R.id.TextView01);
pickDate = (Button)findViewById(R.id.Button01);
pickDate.setOnClickListener( new OnClickListener() {
@Override
public void onClick(View v) {
showDialog(DATE_DIALOG_ID);
}
});
final Calendar cal = Calendar.getInstance();
year = cal.get(Calendar.YEAR);
month = cal.get(Calendar.MONTH);
day = cal.get(Calendar.DAY_OF_MONTH);
updateDate();
timeDisplay = (TextView)findViewById(R.id.TextView02);
pickTime = (Button)findViewById(R.id.Button02);
pickTime.setOnClickListener( new OnClickListener () {
@Override
public void onClick(View v) {
showDialog(TIME_DIALOG_ID);
}
});
hours = cal.get(Calendar.HOUR);
min = cal.get(Calendar.MINUTE);
updateTime();
}
private void updateTime() {
timeDisplay.setText(new StringBuilder().append(hours).append(':')
.append(min));
}
private void updateDate() {
dateDisplay.setText(new StringBuilder().append(day).append('-')
.append(month + 1).append('-').append(year));
}
private DatePickerDialog.OnDateSetListener dateListener =
new DatePickerDialog.OnDateSetListener() {
@Override
public void onDateSet(DatePicker view, int yr, int monthOfYear,
int dayOfMonth) {
year = yr;
month = monthOfYear;
day = dayOfMonth;
updateDate();
}
};
private TimePickerDialog.OnTimeSetListener timeListener =
new TimePickerDialog.OnTimeSetListener() {
@Override
public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
hours = hourOfDay;
min = minute;
updateTime();
}
};
protected Dialog onCreateDialog(int id){
switch(id) {
case DATE_DIALOG_ID:
return new DatePickerDialog(this, dateListener, year, month, day);
case TIME_DIALOG_ID:
return new TimePickerDialog(this, timeListener, hours, min, false);
}
return null;
}
}
main.xml中
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView android:text="@string/date_text"
android:id="@+id/TextView01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="26px"
android:typeface="sans"></TextView>
<Button android:text="@string/date_button"
android:id="@+id/Button01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"></Button>
<TextView android:text="@string/time_text"
android:id="@+id/TextView02"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="26px"
android:typeface="sans"></TextView>
<Button android:text="@string/time_button"
android:id="@+id/Button02"
android:layout_width="wrap_content"
android:layout_height="wrap_content"></Button>
</LinearLayout>
datepickerlayout.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<DatePicker
android:id="@+id/DatePicker01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"></DatePicker>
</LinearLayout>
在全局中声明变量为：
private int year, month, day, Hour, Minute;
public static final int DATE_PICKER_ID = 1111;
在onCreate（）
// Get current date by calender
final Calendar c = Calendar.getInstance();
year = c.get(Calendar.YEAR);
month = c.get(Calendar.MONTH);
day = c.get(Calendar.DAY_OF_MONTH);
从按钮点击调用datepicker
showDialog(Constant.DATE_PICKER_ID);
方法：
@Override
protected Dialog onCreateDialog(int id) {
switch (id) {
case Constant.DATE_PICKER_ID:
// open datepicker dialog.
// set date picker for current date
// add pickerListener listner to date picker
return new DatePickerDialog(this, pickerListener, year, month, day);
case Constant.TIME_PICKER_ID:
return new TimePickerDialog(this, timeSetListener, Hour, Minute, false);
}
return null;
}
private DatePickerDialog.OnDateSetListener pickerListener = new DatePickerDialog.OnDateSetListener() {
// when dialog box is closed, below method will be called.
@Override
public void onDateSet(DatePicker view, int selectedYear,
int selectedMonth, int selectedDay) {
year = selectedYear;
month = selectedMonth;
day = selectedDay;
text_date.setText(new StringBuilder().append(month + 1)
.append("/").append(day).append("/").append(year)
.append(" "));
}
};
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