[英]How can I add 40 weeks to the current date I get from the date picker
I have this code, I want to add 40 weeks to the date I get from the date Picker and get the new date after the 40 weeks (280 days) has been added to the date from the date picker. 我有这段代码,我想在从日期选择器获得的日期中添加40周,并在将40周(280天)添加到日期选择器中的日期后获得新日期。
Code: 码:
public class MainActivity extends AppCompatActivity {
DatePickerDialog picker;
EditText eText;
Button btnGet;
TextView tvw;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tvw=(TextView)findViewById(R.id.textView1);
eText=(EditText) findViewById(R.id.editText1);
eText.setInputType(InputType.TYPE_NULL);
eText.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
final Calendar cldr = Calendar.getInstance();
int day = cldr.get(Calendar.DAY_OF_MONTH);
int month = cldr.get(Calendar.MONTH);
int year = cldr.get(Calendar.YEAR);
// date picker dialog
picker = new DatePickerDialog(MainActivity.this,
new DatePickerDialog.OnDateSetListener() {
@Override
public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
eText.setText(dayOfMonth + "/" + (monthOfYear + 1) + "/" + year);
}
}, year, month, day);
picker.show();
}
});
btnGet=(Button)findViewById(R.id.button1);
btnGet.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
tvw.setText("Selected Date: "+ eText.getText());
}
});
}
}
Joda time
is a very convenient library for handling such cases. Joda time
是处理此类情况的非常方便的库。 Add this to your project: 将此添加到您的项目:
dependencies {
compile 'joda-time:joda-time:2.10.2'
}
And then you can manipulate the dates like this: 然后您可以像这样操作日期:
DateTime dt = DateTime.now();
DateTime laterDate = dt.withYear(2020)
.withMonthOfYear(3)
.withDayOfMonth(14)
.plusWeeks(40);
Remember that in JodaTime
date objects are immutable (which is a very good idea), so each manipulation produces a new object. 请记住,在JodaTime
日期对象是不可变的(这是一个好主意),因此每次操作都会产生一个新对象。
First, convert the current format to milliseconds and then add specific days milliseconds and then again get it in the desired format. 首先,将当前格式转换为毫秒,然后添加特定天数毫秒,然后再次将其转换为所需格式。 Like this way: 像这样:
new DatePickerDialog(MainActivity.this,
new DatePickerDialog.OnDateSetListener() {
@Override
public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
Calendar calendar = Calendar.getInstance();
calendar.set(year,monthOfYear + 1,dayOfMonth);
long timeInMilliseconds =
calendar.getTimeInMillis()+TimeUnit.DAYS.toMillis(280);
calendar.setTimeInMillis(timeInMilliseconds);
int mYear = calendar.get(Calendar.YEAR);
int mMonth = calendar.get(Calendar.MONTH);
int mDay = calendar.get(Calendar.DAY_OF_MONTH);
eText.setText(mDay + "/" + mMonth + "/" + mYear);
}
}, year, month, day);
picker.show();
}
});
通过这种方式使用add(Calendar.DAY_OF_MONTH,int)函数:
cldr.add(Calendar.DAY_OF_MONTH, 280);
从逻辑上讲,您不必说40 weeks
,一个星期有特定的天数,因此您可以在从日期选择器中获取的当日中添加40 * 7 = 280天。
[current date] + TimeUnit.DAYS.toMillis(280)
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