文本视图仅在选取日期两次后更新

Question

>我在对话框中使用两个文本视图，一个用于开始日期，另一个用于结束日期。现在，当我单击从日期文本视图时，日期选择器对话框将打开，当我选择日期时，它不会在文本视图中更新，如果我再次打开日期选择器并在文本视图中第二次更新日期时选择日期。任何人都可以弄清楚为什么它没有第一次更新。

public static void datePickerDialog(final Context context) {
dialog = new Dialog(context);
dialog.setContentView(R.layout.date_picker_dialog);
fromDateText = dialog.findViewById(R.id.from_date);
toDateText = dialog.findViewById(R.id.to_date);
fromDateText.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
datePicker(context);
}
});
toDateText.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
datePicker(context);
}
});
dialog.show();
fromDateText.setText(fromDate);
toDateText.setText(toDate);
}

public static void datePicker(Context context){
fromDatePicker = new DatePickerDialog(context, android.R.style.Theme_Holo_Light_Dialog_MinWidth
,fromDateListner, fromDay, fromMonth, fromYear);
simpleDateFormat = new SimpleDateFormat("dd/MM/yyyy");
fromDatePicker.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
fromDatePicker.show();
fromDateListner = new DatePickerDialog.OnDateSetListener() {
@Override
public void onDateSet(DatePicker view, int year, int month, int dayOfMonth) {
month+=1;
fromDate = dayOfMonth+"/"+month+"/"+year;
setDate();
}
};
}
private static void setDate() {
try {
dateFrom = simpleDateFormat.parse(fromDate);
dateTo = simpleDateFormat.parse(toDate);
} catch (ParseException e) {
e.printStackTrace();
}
fromDateText.setText(dateFrom.toString());
toDateText.setText(dateTo.toString());
}

Answer 1

fromDateListner

在创建对话框后初始化，因此第一次创建DatePickerDialog时没有侦听器。

在fromDatePicker = new DatePickerDialog(context ...之前移动fromDateListner = new DatePickerDialog.OnDateSetListener() ...零件

Answer 2

你能这样试试吗？

private static void setDate() {
try {
dateFrom = simpleDateFormat.parse(fromDate);
dateTo = simpleDateFormat.parse(toDate);
fromDateText.setText(dateFrom.toString());
toDateText.setText(dateTo.toString());
} catch (ParseException e) {
e.printStackTrace();
}
}

//编辑：

检查我的代码：

private void showDatePicker() {
final Calendar myCalendar = Calendar.getInstance();
DatePickerDialog.OnDateSetListener date = new DatePickerDialog.OnDateSetListener() {
@Override
public void onDateSet(DatePicker datePicker, int year, int monthOfYear, int dayOfMonth) {
myCalendar.set(Calendar.YEAR, year);
myCalendar.set(Calendar.MONTH, monthOfYear);
myCalendar.set(Calendar.DAY_OF_MONTH, dayOfMonth);
setDate(myCalendar.getTime());
}
};
if (getActivity() != null) {
new DatePickerDialog(getActivity(), date, myCalendar
.get(Calendar.YEAR), myCalendar.get(Calendar.MONTH),
myCalendar.get(Calendar.DAY_OF_MONTH)).show();
}
}
private void setDate(Date time) {
SimpleDateFormat sdf = new SimpleDateFormat("dd.MM.yyyy", Locale.US);
editText.setText(sdf.format(time));
}

Answer 3

试试这段代码.. 为选定的文本视图获取布尔变量...

像这样改变方法..

public class DialogActiivty extends AppCompatActivity {
private TextView fromDateText,toDateText;
private String fromDate,toDate;
private Dialog dialog;
private DatePickerDialog fromDatePicker;
private SimpleDateFormat simpleDateFormat;
private Calendar calendar;
private int year, month, day;
private boolean fromSelected=false,toSelected=true;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
datePickerDialog(DialogActiivty.this);
}
public  void datePickerDialog(final Context context) {
calendar=Calendar.getInstance();
year = calendar.get(Calendar.YEAR);
month = calendar.get(Calendar.MONTH);
day = calendar.get(Calendar.DAY_OF_MONTH);
dialog = new Dialog(context);
dialog.setContentView(R.layout.date_picker_dialog);
fromDateText = dialog.findViewById(R.id.from_date);
toDateText = dialog.findViewById(R.id.to_date);
fromDateText.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
toSelected=false;
fromSelected=true;
datePicker(context);
}
});
toDateText.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
fromSelected=false;
toSelected=true;
datePicker(context);
}
});
dialog.show();
//        fromDateText.setText(fromDate);
//        toDateText.setText(toDate);
}

public  void datePicker(Context context){
fromDatePicker = new DatePickerDialog(context, android.R.style.Theme_Holo_Light_Dialog_MinWidth
,fromDateListner, year, month, day);
simpleDateFormat = new SimpleDateFormat("dd/MM/yyyy");
fromDatePicker.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
fromDatePicker.show();

}
DatePickerDialog.OnDateSetListener fromDateListner = new DatePickerDialog.OnDateSetListener() {
@Override
public void onDateSet(DatePicker view, int year, int month, int dayOfMonth) {
month+=1;
fromDate = dayOfMonth+"/"+month+"/"+year;
setDate(fromDate);
}
};
private  void setDate(String fromDate) {
if (fromSelected) {
fromDateText.setText(fromDate);
}
if (toSelected) {
toDateText.setText(fromDate);
}
}
}