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[英]How can I set current date (Today's date) same as selected date in Material Date Picker Android
[英]How can I add 40 weeks to the current date I get from the date picker
我有這段代碼,我想在從日期選擇器獲得的日期中添加40周,並在將40周(280天)添加到日期選擇器中的日期后獲得新日期。
碼:
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
是處理此類情況的非常方便的庫。 將此添加到您的項目:
dependencies {
compile 'joda-time:joda-time:2.10.2'
}
然后您可以像這樣操作日期:
DateTime dt = DateTime.now();
DateTime laterDate = dt.withYear(2020)
.withMonthOfYear(3)
.withDayOfMonth(14)
.plusWeeks(40);
請記住,在JodaTime
日期對象是不可變的(這是一個好主意),因此每次操作都會產生一個新對象。
首先,將當前格式轉換為毫秒,然后添加特定天數毫秒,然后再次將其轉換為所需格式。 像這樣:
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();
}
});
通過這種方式使用add(Calendar.DAY_OF_MONTH,int)函數:
cldr.add(Calendar.DAY_OF_MONTH, 280);
從邏輯上講,您不必說40 weeks
,一個星期有特定的天數,因此您可以在從日期選擇器中獲取的當日中添加40 * 7 = 280天。
[current date] + TimeUnit.DAYS.toMillis(280)
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