按下返回按钮时关闭 DatePickerDialog
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【中文标题】按下返回按钮时关闭 DatePickerDialog【英文标题】:Dismiss DatePickerDialog on pressing back button 【发布时间】:2013-02-23 16:20:06 【问题描述】:在我看来,我有一个按钮,按下它会弹出一个 DatePickerDialog。弹出的对话框有一个“完成”按钮。当我按下该按钮时,所选日期将填充到 EditText 框中。
现在,当我按下返回按钮 () 时,它仍会在 EditText 中填充日期。如何关闭对话框而不返回任何值。
这是我得到的代码-
调用片段的活动:
public class TransactionActivity extends FragmentActivity implements iRibbonMenuCallback
.....
public void selectDate(View view)
// This is the method invoked by the button
SelectDateFragment newFragment = new SelectDateFragment();
newFragment.show(getSupportFragmentManager(), "DatePicker");
public void populateSetDate(int year, int month, int day)
// Puts the date in the EditText box
mEdit = (EditText)findViewById(R.id.DateText);
mEdit.setText(month+"/"+day+"/"+year);
Dialog 的片段(基于 android API 指南上的this 页面):
public class SelectDateFragment extends DialogFragment implements DatePickerDialog.OnDateSetListener
@Override
public Dialog onCreateDialog(Bundle savedInstanceState)
final Calendar calendar = Calendar.getInstance();
int yy = calendar.get(Calendar.YEAR);
int mm = calendar.get(Calendar.MONTH);
int dd = calendar.get(Calendar.DAY_OF_MONTH);
return new DatePickerDialog(getActivity(), this, yy, mm, dd);
public void onDateSet(DatePicker view, int yy, int mm, int dd)
// Calls a method on the activity which invokes this fragment
((TransactionActivity)getActivity()).populateSetDate(yy, mm+1, dd);
似乎没有类似于 onDataSet 的方法来处理未设置数据的情况。
有没有办法取消/关闭弹出的日期选择器而不获取它的价值?
谢谢。
【问题讨论】:
【参考方案1】:Jelybean 似乎存在一个错误,即取消按钮不起作用(因此返回按钮)。这在Jelly Bean DatePickerDialog --- is there a way to cancel?
中进行了讨论David Cesarino,在上述帖子中报告了错误和解决方法,并发布了他的解决方案here 和SO。
cavega 稍微修改了上述解决方案,以允许将 DatePickerDialog 中的日期初始化为今天以外的日期。代码可以找到here。我使用了他的解决方案并让它工作。
【讨论】:
【参考方案2】:我编写了标准 DatePickerDialog 的简单继任者,对我来说效果很好:
/**
* Enhanced date picker dialog. Main difference from ancestor is that it calls
* OnDateSetListener only when when pressing OK button, and skips event when closing with
* BACK key or by tapping outside a dialog.
*/
public class IBSDatePickerDialog extends DatePickerDialog
public IBSDatePickerDialog(final Context context, final OnDateSetListener callBack, final int year, final int monthOfYear, final int dayOfMonth)
super(context, callBack, year, monthOfYear, dayOfMonth);
public IBSDatePickerDialog(final Context context, final int theme, final OnDateSetListener callBack, final int year, final int monthOfYear, final int dayOfMonth)
super(context, theme, callBack, year, monthOfYear, dayOfMonth);
@Override
public void onClick(final DialogInterface dialog, final int which)
// Prevent calling onDateSet handler when clicking to dialog buttons other, then "OK"
if (which == DialogInterface.BUTTON_POSITIVE)
super.onClick(dialog, which);
@Override
protected void onStop()
// prevent calling onDateSet handler when stopping dialog for whatever reason (because this includes
// closing by BACK button or by tapping outside dialog, this is exactly what we try to avoid)
//super.onStop();
使用对话框示例(免费奖励:在对话框中添加取消按钮以获得更好的可用性):
public static class datePickerFragment extends DialogFragment implements DatePickerDialog.OnDateSetListener
@Override
public Dialog onCreateDialog(final Bundle savedInstanceState)
Calendar cal = Calendar.getInstance();
IBSDatePickerDialog dlg = new IBSDatePickerDialog(myActivity, this, cal.get(Calendar.YEAR), cal.get(Calendar.MONTH), cal.get(Calendar.DAY_OF_MONTH));
// Add Cancel button into dialog
dlg.setButton(DialogInterface.BUTTON_NEGATIVE, "Cancel", (OnClickListener) null);
return dlg;
@Override
public void onDateSet(final DatePicker view, final int year, final int month, final int day)
// TODO: do whatever you want with date selected
public void showDatePickerDialog()
final datePickerFragment f = new datePickerFragment();
f.show(getSupportFragmentManager(), "datePicker");
【讨论】:
【参考方案3】:我也为此苦苦挣扎,但解决方案非常简单。 DialogFragment 实现了 DialogInterface.OnCancelListener 和 DialogInterface.OnDismissListener 并且因为 DialogInterface.OnCancelListener.onCancel 在 DialogInterface.OnDismissListener.onDismiss 之前被调用,所以您可以清除 onCancel 中的日期值并调用 onDismiss 中的 TransactionActivity.populateSetDate 方法,前提是日期值是不是 0。
顺便说一句:为了使 Fragment 更加独立,最好在 Fragment 定义一个调用 Activity 必须实现的公共接口,这样您就可以在该接口而不是 Activity 上调用 populateSetDate 方法。
有关 onCancel 和 onDismiss 的实现,请参见下面的代码:
public class SelectDateFragment extends DialogFragment
implements DatePickerDialog.OnDateSetListener
private int year;
private int month;
private int day;
@Override
public Dialog onCreateDialog(Bundle savedInstanceState)
final Calendar calendar = Calendar.getInstance();
int yy = calendar.get(Calendar.YEAR);
int mm = calendar.get(Calendar.MONTH);
int dd = calendar.get(Calendar.DAY_OF_MONTH);
return new DatePickerDialog(getActivity(), this, yy, mm, dd);
public void onDateSet(DatePicker view, int yy, int mm, int dd)
// Calls a method on the activity which invokes this fragment
// ((TransactionActivity)getActivity()).populateSetDate(yy, mm+1, dd);
year = yy;
month = mm;
day = dd;
// Gets called before onDismiss, so we can erase the selectedDate
@Override
public void onCancel(DialogInterface dialog)
year = 0;
month = 0;
day = 0;
@Override
public void onDismiss(DialogInterface dialog)
if (year != 0)
((TransactionActivity)getActivity()).populateSetDate(year, month + 1, day);
【讨论】:
【参考方案4】:public class pickerdate extends Activity
/** Called when the activity is first created. */
private TextView mDateDisplay;
private Button mPickDate;
private int mYear;
private int mMonth;
private int mDay;
static final int DATE_DIALOG_ID = 0;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mDateDisplay = (TextView) findViewById(R.id.dateDisplay);
mPickDate = (Button) findViewById(R.id.pickDate);
mPickDate.setOnClickListener(new View.OnClickListener()
public void onClick(View v)
showDialog(DATE_DIALOG_ID);
);
final Calendar c = Calendar.getInstance();
mYear = c.get(Calendar.YEAR);
mMonth = c.get(Calendar.MONTH);
mDay = c.get(Calendar.DAY_OF_MONTH);
updateDisplay();
private void updateDisplay()
mDateDisplay.setText(
new StringBuilder()
// Month is 0 based so add 1
.append(mMonth + 1).append("-")
.append(mDay).append("-")
.append(mYear).append(" "));
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();
;
@Override
protected Dialog onCreateDialog(int id)
switch (id)
case DATE_DIALOG_ID:
return new DatePickerDialog(this,
mDateSetListener,
mYear, mMonth, mDay);
return null;
上面的代码对我有用。该对话框具有设置和取消按钮。设置将设置日期,取消将关闭对话框。根据您的需要进行相同的修改。单击后退按钮也将关闭对话框。
【讨论】:
我在我的方法中使用片段 & 我认为,如果我是对的,这就是 ICS 及更高版本的方法.. 你的意思是说以上在 Fragments 中不起作用??以上应该在片段中工作。我没试过。但它应该工作。我看不出有任何理由为什么这对 n 个片段不起作用。其他人可以用这个。【参考方案5】:我想你是在问这个
setOnCancelListener(new OnCancelListener()
@Override
public void onCancel(DialogInterface dialog)
【讨论】:
这似乎不起作用。这是我尝试过的:dialog.setOnKeyListener(new Dialog.OnKeyListener() @Override public boolean onKey(DialogInterface arg0, int keyCode, KeyEvent event) if (keyCode == KeyEvent.KEYCODE_BACK) dialog.dismiss(); return false; );
【参考方案6】:
您可以尝试将其包含在您的 alertDialog 中
如果取消对话框,mEdit 将返回为空。
mEdit.setText("");
AlertDialog alertDialog;
alertDialog.setOnCancelListener(new OnCancelListener()
@Override
public void onCancel(DialogInterface dialog)
// TODO Auto-generated method stub
mEdit.setText("");
dialog.dismiss();
);
【讨论】:
DatePickerDialog 似乎没有 onCancel 方法。这就是我所拥有的:final DatePickerDialog dialog = new DatePickerDialog(getActivity(), this, yy, mm, dd); dialog.setOnCancelListener(new OnCancelListener() ...
我在 eclipse 上收到 not applicable for the arguments
消息。
我的错。我把这个弄错了。【参考方案7】:
使用下面的方法,当用户按下返回按钮时调用。这个方法是Activity
。
@Override
public void onBackPressed()
// TODO Auto-generated method stub
super.onBackPressed();
dialog.dismiss();
【讨论】:
我在 Fragment 类中有 DatePickerDialog。public class SelectDateFragment extends DialogFragment
。 onBackPressed() 似乎在 DialogFragment 的协议中没有方法。Eclipse 说 The method onBackPressed() of type SelectDateFragment must override or implement a supertype method
但是FragmentActivity
中有一个方法。你不觉得你可以在DialogFragment
中创建一个监听器,当活动获得 Back 按钮按下事件时,你会触发一个监听器吗??【参考方案8】:
您可以为正按钮实现自定义 OnClickListener,而不是实现自定义 DatePickerDialog:
DatePickerDialog dateDialog = new DatePickerDialog(this, null, year, month, day);
datePickerDialog.setButton(DialogInterface.BUTTON_POSITIVE,
getResources().getString(R.string.text_done),
new OnDoneClickListener(datePickerDialog));
// <...>
private class OnDoneClickListener implements DialogInterface.OnClickListener
private DatePickerDialog mPickerDialog;
BirthDatePickerDialog(DatePickerDialog mPickerDialog)
this.mPickerDialog = mPickerDialog;
@Override
public void onClick(DialogInterface dialog, int which)
SimpleDateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy");
Calendar cal = Calendar.getInstance();
DatePicker picker = mPickerDialog.getDatePicker();
cal.set(Calendar.YEAR, picker.getYear());
cal.set(Calendar.MONTH, picker.getMonth());
cal.set(Calendar.DAY_OF_MONTH, picker.getDayOfMonth());
spinnerDateBirth.setText(dateFormat.format(cal.getTime()));
任何返回或点击空白区域都会关闭对话框,什么也不做。
【讨论】:
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