防止用户选择过去的时间 - TimePickerDialog
Prevent user from selecting past time - TimePickerDialog
重要编辑: 我做了一些搜索,似乎 OnTimeChangedListener 在 Android 5.0 (API 21 ). Gustavo 在下面的回答适用于 API 20 或更低,以及我测试过的 API 22。 (Source)
我想阻止用户输入当前时间之前的时间。我使用 Date
提供的 before
方法检查有效时间。如何防止对话框在此有效性检查中接受无效时间?
我省略了初始化选定时间的多余代码(作为 Date
)。
final Calendar mcurrentTime = Calendar.getInstance();
final int hour = mcurrentTime.get(Calendar.HOUR_OF_DAY);
final int minute = mcurrentTime.get(Calendar.MINUTE);
final TimePickerDialog mTimePicker;
mTimePicker = new TimePickerDialog(MainActivity.this, new TimePickerDialog.OnTimeSetListener() {
@Override
public void onTimeSet(TimePicker timePicker, int selectedHour, int selectedMinute) {
//PSEUDO: Date selectedDateTime init here
if (selectedDateTime.before(mcurrentTime.getTime())) {
// prevent user from selecting time
}
}
}, hour, minute, true);//true = 24 hour time
mTimePicker.setTitle("Select Time");
mTimePicker.show();
方法 onTimeSet()
在关闭对话框时调用一次,在单击“完成”按钮时调用两次。
我将在第二次调用时在该方法中进行验证。忽略第一个。如果无效,则显示错误(可能是敬酒)并再次显示对话框
详细说明
两次 onTimeSet
调用的时间相同。现在,我没有参考,但我相信 one 调用是在显示对话框(时间设置与否)然后被取消时调用的。 Two 就是这样,但不是取消,而是在用户点击 "Done" 时。
之所以说第一个忽略是因为可以设置时间,然后决定取消。在那种情况下,不要拿onTimeSet()
。如果这对你来说不重要,那就不用担心了。
Here原post.
下面的回答你应该添加 TimePickerDialog class.
public class RangeTimePickerDialog extends TimePickerDialog {
private int minHour = -1;
private int minMinute = -1;
private int maxHour = 25;
private int maxMinute = 25;
private int currentHour = 0;
private int currentMinute = 0;
private Calendar calendar = Calendar.getInstance();
private DateFormat dateFormat;
public RangeTimePickerDialog(Context context, OnTimeSetListener callBack, int hourOfDay, int minute, boolean is24HourView) {
super(context, callBack, hourOfDay, minute, is24HourView);
currentHour = hourOfDay;
currentMinute = minute;
dateFormat = DateFormat.getTimeInstance(DateFormat.SHORT);
try {
Class<?> superclass = getClass().getSuperclass();
Field mTimePickerField = superclass.getDeclaredField("mTimePicker");
mTimePickerField.setAccessible(true);
TimePicker mTimePicker = (TimePicker) mTimePickerField.get(this);
mTimePicker.setOnTimeChangedListener(this);
} catch (NoSuchFieldException e) {
} catch (IllegalArgumentException e) {
} catch (IllegalAccessException e) {
}
}
public void setMin(int hour, int minute) {
minHour = hour;
minMinute = minute;
}
public void setMax(int hour, int minute) {
maxHour = hour;
maxMinute = minute;
}
@Override
public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {
Log.d("DADADADA", "onTimeChanged");
boolean validTime = true;
if (hourOfDay < minHour || (hourOfDay == minHour && minute < minMinute)) {
validTime = false;
}
if (hourOfDay > maxHour || (hourOfDay == maxHour && minute > maxMinute)) {
validTime = false;
}
if (validTime) {
currentHour = hourOfDay;
currentMinute = minute;
}
updateTime(currentHour, currentMinute);
updateDialogTitle(view, currentHour, currentMinute);
}
private void updateDialogTitle(TimePicker timePicker, int hourOfDay, int minute) {
calendar.set(Calendar.HOUR_OF_DAY, hourOfDay);
calendar.set(Calendar.MINUTE, minute);
String title = dateFormat.format(calendar.getTime());
setTitle(title);
}
}
之后,将 TimePickerDialog 替换为 RangeTimePickerDialog
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final Calendar mcurrentTime = Calendar.getInstance();
final int hour = mcurrentTime.get(Calendar.HOUR_OF_DAY);
final int minute = mcurrentTime.get(Calendar.MINUTE);
final RangeTimePickerDialog mTimePicker;
mTimePicker = new RangeTimePickerDialog(MainActivity.this, new TimePickerDialog.OnTimeSetListener() {
@Override
public void onTimeSet(TimePicker timePicker, int selectedHour, int selectedMinute) {
Log.d("TAG", "inside OnTimeSetListener");
}
}, hour, minute, true);//true = 24 hour time
mTimePicker.setTitle("Select Time");
mTimePicker.setMin(hour, minute);
mTimePicker.show();
}
}
在那之后,检查你的对话框,时间没有超过限制,我已经用 setMax() 或 setMin()[=26 检查了这个=] 也只设置一个。
重要编辑: 我做了一些搜索,似乎 OnTimeChangedListener 在 Android 5.0 (API 21 ). Gustavo 在下面的回答适用于 API 20 或更低,以及我测试过的 API 22。 (Source)
我想阻止用户输入当前时间之前的时间。我使用 Date
提供的 before
方法检查有效时间。如何防止对话框在此有效性检查中接受无效时间?
我省略了初始化选定时间的多余代码(作为 Date
)。
final Calendar mcurrentTime = Calendar.getInstance();
final int hour = mcurrentTime.get(Calendar.HOUR_OF_DAY);
final int minute = mcurrentTime.get(Calendar.MINUTE);
final TimePickerDialog mTimePicker;
mTimePicker = new TimePickerDialog(MainActivity.this, new TimePickerDialog.OnTimeSetListener() {
@Override
public void onTimeSet(TimePicker timePicker, int selectedHour, int selectedMinute) {
//PSEUDO: Date selectedDateTime init here
if (selectedDateTime.before(mcurrentTime.getTime())) {
// prevent user from selecting time
}
}
}, hour, minute, true);//true = 24 hour time
mTimePicker.setTitle("Select Time");
mTimePicker.show();
方法 onTimeSet()
在关闭对话框时调用一次,在单击“完成”按钮时调用两次。
我将在第二次调用时在该方法中进行验证。忽略第一个。如果无效,则显示错误(可能是敬酒)并再次显示对话框
详细说明
两次 onTimeSet
调用的时间相同。现在,我没有参考,但我相信 one 调用是在显示对话框(时间设置与否)然后被取消时调用的。 Two 就是这样,但不是取消,而是在用户点击 "Done" 时。
之所以说第一个忽略是因为可以设置时间,然后决定取消。在那种情况下,不要拿onTimeSet()
。如果这对你来说不重要,那就不用担心了。
Here原post.
下面的回答你应该添加 TimePickerDialog class.
public class RangeTimePickerDialog extends TimePickerDialog {
private int minHour = -1;
private int minMinute = -1;
private int maxHour = 25;
private int maxMinute = 25;
private int currentHour = 0;
private int currentMinute = 0;
private Calendar calendar = Calendar.getInstance();
private DateFormat dateFormat;
public RangeTimePickerDialog(Context context, OnTimeSetListener callBack, int hourOfDay, int minute, boolean is24HourView) {
super(context, callBack, hourOfDay, minute, is24HourView);
currentHour = hourOfDay;
currentMinute = minute;
dateFormat = DateFormat.getTimeInstance(DateFormat.SHORT);
try {
Class<?> superclass = getClass().getSuperclass();
Field mTimePickerField = superclass.getDeclaredField("mTimePicker");
mTimePickerField.setAccessible(true);
TimePicker mTimePicker = (TimePicker) mTimePickerField.get(this);
mTimePicker.setOnTimeChangedListener(this);
} catch (NoSuchFieldException e) {
} catch (IllegalArgumentException e) {
} catch (IllegalAccessException e) {
}
}
public void setMin(int hour, int minute) {
minHour = hour;
minMinute = minute;
}
public void setMax(int hour, int minute) {
maxHour = hour;
maxMinute = minute;
}
@Override
public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {
Log.d("DADADADA", "onTimeChanged");
boolean validTime = true;
if (hourOfDay < minHour || (hourOfDay == minHour && minute < minMinute)) {
validTime = false;
}
if (hourOfDay > maxHour || (hourOfDay == maxHour && minute > maxMinute)) {
validTime = false;
}
if (validTime) {
currentHour = hourOfDay;
currentMinute = minute;
}
updateTime(currentHour, currentMinute);
updateDialogTitle(view, currentHour, currentMinute);
}
private void updateDialogTitle(TimePicker timePicker, int hourOfDay, int minute) {
calendar.set(Calendar.HOUR_OF_DAY, hourOfDay);
calendar.set(Calendar.MINUTE, minute);
String title = dateFormat.format(calendar.getTime());
setTitle(title);
}
}
之后,将 TimePickerDialog 替换为 RangeTimePickerDialog
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final Calendar mcurrentTime = Calendar.getInstance();
final int hour = mcurrentTime.get(Calendar.HOUR_OF_DAY);
final int minute = mcurrentTime.get(Calendar.MINUTE);
final RangeTimePickerDialog mTimePicker;
mTimePicker = new RangeTimePickerDialog(MainActivity.this, new TimePickerDialog.OnTimeSetListener() {
@Override
public void onTimeSet(TimePicker timePicker, int selectedHour, int selectedMinute) {
Log.d("TAG", "inside OnTimeSetListener");
}
}, hour, minute, true);//true = 24 hour time
mTimePicker.setTitle("Select Time");
mTimePicker.setMin(hour, minute);
mTimePicker.show();
}
}
在那之后,检查你的对话框,时间没有超过限制,我已经用 setMax() 或 setMin()[=26 检查了这个=] 也只设置一个。