我有一个日期选择器，应该允许用户只选择昨天的日期，而且月份和年份不应该是可更改的。以下是我的日期选择器代码，有人可以查看并告诉我为实现我想要的结果所做的更改吗？
DatePicker Java：
public class MainActivity extends ActionBarActivity {
java.text.DateFormat format = java.text.DateFormat.getDateInstance();
Calendar cal = Calendar.getInstance();
TextView label;
Button btn;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
label = (TextView) findViewById(R.id.textView1);
btn = (Button) findViewById(R.id.button1);
updatedate();
btn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
setDate();
}
});
}
public void updatedate(){
label.setText(format.format(cal.getTime()));
}
public void setDate(){
new DatePickerDialog(MainActivity.this, d, cal.get(cal.YEAR), cal.get(cal.MONTH), cal.get(cal.DAY_OF_MONTH)).show();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
DatePickerDialog.OnDateSetListener d = new DatePickerDialog.OnDateSetListener() {
@Override
public void onDateSet(DatePicker view, int year, int monthOfYear,
int dayOfMonth) {
cal.set(cal.YEAR, year);
cal.set(cal.MONTH, monthOfYear);
cal.set(cal.DAY_OF_MONTH, dayOfMonth);
updatedate();
}
};
}
答案 0 :(得分：1)
Say for eg:
您正在使用此处的按钮单击并打开日期选择器对话框，并在选择后在textview中设置它们。
dateOfBirth = (Button) findViewById(R.id.dateOfBirth);
dateOfBirth.setOnClickListener(onDatePickerClick);
private final OnClickListener onDatePickerClick = new OnClickListener() {
@Override
public void onClick(View v) {
Utils.getDatePickerDialog(PersonalDetails.this, datePickerListener,
birthDayValue, birthMonthValue, birthYearValue);
//Utils is a class file where i used a method getDatePickerDialog
}
private final DatePickerDialog.OnDateSetListener datePickerListener = new DatePickerDialog.OnDateSetListener() {
@Override
public void onDateSet(DatePicker view, int selectedYear,
int selectedMonth, int selectedDay) {
String birthDayDateFormt = Utils.getBirthDayDate(
selectedYear, selectedMonth, selectedDay);
textView.setText(birthDayDateFormt);
}
Utils:
public static void getDatePickerDialog(Activity activity, DatePickerDialog.OnDateSetListener datePickerListener,int selectedDay,int selectedMonth, int selectedYear) {
Calendar c = Calendar.getInstance();
int year,month,day=0;
if(selectedYear==0 && selectedMonth ==0 && selectedDay ==0)
{
year = c.get(Calendar.YEAR);
month = c.get(Calendar.MONTH);
day = c.get(Calendar.DAY_OF_MONTH);
}
else
{
year = selectedYear;
month = selectedMonth;
day = selectedDay;
}
Date minDate = new Date();
c.set(c.get(Calendar.YEAR), c.get(Calendar.MONTH), c.get(Calendar.DAY_OF_MONTH) - 1, 0, 0);
minDate.setTime(c.getTimeInMillis());
DatePickerDialog dpdFromDate = new DatePickerDialog(activity, datePickerListener, year, month, day);
dpdFromDate.getDatePicker().setMaxDate(System.currentTimeMillis()); .. here i used maxdate.
dpdFromDate.show();
}
public static String getBirthDayDate(int selectedYear, int selectedMonth,
int selectedDay) {
int month = selectedMonth + 1;
String formattedMonth = Constants.EMPTY + month;
String formattedDayOfMonth = Constants.EMPTY + selectedDay;
if (month < 10) {
formattedMonth = Constants.ZERO + month;
}if (selectedDay < 10) {
formattedDayOfMonth = Constants.ZERO + selectedDay;
}
return String.valueOf(formattedMonth)+"/"+String.valueOf(formattedDayOfMonth)+"/"+String.valueOf(selectedYear);
}
答案 1 :(得分：0)
我不知道这是否是标准做法，但根据我的逻辑，我通过以下代码得到了我想要的结果。它将让用户只选择昨天的日期。
例如：如果日期是2015年2月14日且用户选择2015年2月14日或2015年2月13日或2015年2月12日，则日期将仅设为13/02/2015
基本上它意味着日期将设置为昨天的日期，当前年份和当前年份也是当前日期。
JAVA：
import java.util.Calendar;
import java.util.Date;
import android.app.DatePickerDialog;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.TextView;
public class MainActivity extends ActionBarActivity {
java.text.DateFormat format = java.text.DateFormat.getDateInstance();
Calendar cal = Calendar.getInstance();
TextView label;
Button btn;
int y, m , day;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
label = (TextView) findViewById(R.id.textView1);
btn = (Button) findViewById(R.id.button1);
updatedate();
btn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
setDate();
}
});
}
public void updatedate() {
//cal.add(Calendar.DATE, -1);
System.out.println("date format: "+format.format(cal.getTime()));
label.setText(format.format(cal.getTime()));
}
public void setDate() {
DatePickerDialog de = new DatePickerDialog(MainActivity.this, d,cal.get(Calendar.YEAR), cal.get(Calendar.MONTH), cal.get(Calendar.DAY_OF_MONTH));
de.getDatePicker().setMaxDate(System.currentTimeMillis());
de.show();
}
DatePickerDialog.OnDateSetListener d = new DatePickerDialog.OnDateSetListener() {
public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
y = Calendar.getInstance().get(Calendar.YEAR);
m = Calendar.getInstance().get(Calendar.MONTH);
day = Calendar.getInstance().get(Calendar.DAY_OF_MONTH);
if(day==dayOfMonth)
{
int dt = dayOfMonth-1;
cal.set(Calendar.DAY_OF_MONTH, dt );
}
else if(day>dayOfMonth)
{
int ldt = day-1;
cal.set(Calendar.DAY_OF_MONTH, ldt);
}
if(year<y)// && monthOfYear<m && day==dayOfMonth){
{
//int dt = dayOfMonth-1;
year = y;
//monthOfYear = m;
//dayOfMonth = day;
//cal.set(Calendar.MONTH, monthOfYear);
cal.set(Calendar.YEAR, year);
//cal.set(Calendar.DAY_OF_MONTH, dt);
}
if(monthOfYear<m)
{
monthOfYear = m;
cal.set(Calendar.MONTH, monthOfYear);
}
updatedate();
}
};
}