请帮助解决两个问题：
在代码和我的什么时候将日期格式和时间格式更改为24小时？我没有成功。
如何计算开始日期和结束日期之间的差异（例如：最近2天和5小时）？
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import ru.zloyel.manager_sutochnoy_arendy_1.DatePickerFragmentS.DatePickedListenerS;
import ru.zloyel.manager_sutochnoy_arendy_1.DatePickerFragmentE.DatePickedListenerE;
import ru.zloyel.manager_sutochnoy_arendy_1.TimePickerFragmentS.TimePickerListenerS;
import ru.zloyel.manager_sutochnoy_arendy_1.TimePickerFragmentE.TimePickerListenerE;
import android.app.Activity;
import android.app.DialogFragment;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.RadioButton;
import android.widget.Spinner;
public class Zaselenie extends Activity implements DatePickedListenerS, DatePickedListenerE,
TimePickerListenerS, TimePickerListenerE {
ContactDBmoy cqh;
KvartDB kdb;
SQLiteDatabase sdb;
SQLiteDatabase sdb2;
private Long rowId;
Spinner spKvart, spContact;
RadioButton rbZaselenie, rbBron;
EditText etDateStart;
EditText etTimeStart;
EditText etDateEnd;
EditText etTimeEnd;
ImageView icDateStart;
ImageView icTimeStart;
ImageView icDateEnd;
ImageView icTimeEnd;
ImageView icKvartAdd;
ImageView icContAdd;
Button btnSaveZas;
private int mYear;
private int mMonth;
private int mDay;
private int mHour;
private int mMinute;
private Calendar c;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.zaselenie);
spKvart = (Spinner) findViewById(R.id.spKvart);
spContact = (Spinner) findViewById(R.id.spContact);
rbZaselenie = (RadioButton) findViewById(R.id.rbZaselenie);
rbBron = (RadioButton) findViewById(R.id.rbBron);
etDateStart = (EditText) findViewById(R.id.etDateStart);
etTimeStart = (EditText) findViewById(R.id.etTimeStart);
etDateEnd = (EditText) findViewById(R.id.etDateEnd);
etTimeEnd = (EditText) findViewById(R.id.etTimeEnd);
icContAdd = (ImageView) findViewById(R.id.icContAdd);
icKvartAdd = (ImageView) findViewById(R.id.icKvartAdd);
icDateStart = (ImageView) findViewById(R.id.icDateStart);
icDateEnd = (ImageView) findViewById(R.id.icDateEnd);
icTimeStart = (ImageView) findViewById(R.id.icTimeStart);
icTimeEnd = (ImageView) findViewById(R.id.icTimeEnd);
btnSaveZas = (Button) findViewById(R.id.btnSaveZas);
// Инициализируем наш класс-обёртку
cqh = new ContactDBmoy(Zaselenie.this);
kdb = new KvartDB(Zaselenie.this);
// База нам нужна для записи и чтения
sdb2 = cqh.getWritableDatabase();
sdb = kdb.getWritableDatabase();
// получаем текущее время
final Calendar c = Calendar.getInstance();
mYear = c.get(Calendar.YEAR);
mMonth = c.get(Calendar.MONTH) + 1;
mDay = c.get(Calendar.DAY_OF_MONTH);
mHour = c.get(Calendar.HOUR_OF_DAY);
mMinute = c.get(Calendar.MINUTE);
// выводим текущее время
updateDisplayStart();
updateDisplayEnd();
Bundle extras = getIntent().getExtras();
if (extras != null) {
rowId = extras.getLong(KvartityMain.rowId);
}
if (extras != null) {
rowId = extras.getLong(ContactMain.rowId);
}
// * Помещаем список квартир в спиннер
Cursor cursorKvart = sdb.query(KvartDB.TABLE_NAME, new String[] {
KvartDB._ID, KvartDB.NAME_COLUMN }, null, null,
KvartDB.NAME_COLUMN, null, null);
ArrayList<String> labelsKvart = new ArrayList<String>();
while (cursorKvart.moveToNext()) {
// GET COLUMN INDICES + VALUES OF THOSE COLUMNS
int idKvart = cursorKvart.getInt(cursorKvart
.getColumnIndex(KvartDB._ID));
String nameKvart = cursorKvart.getString(cursorKvart
.getColumnIndex(KvartDB.NAME_COLUMN));
Log.i("LOG_TAG", "ROW " + idKvart + " HAS NAME " + nameKvart);
labelsKvart.add(nameKvart);
// Creating adapter for spinner
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, labelsKvart);
// Drop down layout style - list view with radio button
dataAdapter
.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
dataAdapter.notifyDataSetChanged();
// attaching data adapter to spinner
spKvart.setAdapter(dataAdapter);
}
cursorKvart.close();
// * Помещаем список контактов в спиннер
Cursor cursorContact = sdb2.query(ContactDBmoy.TABLE_NAME,
new String[] { ContactDBmoy._ID, ContactDBmoy.COLUMN_NAME },
null, null, ContactDBmoy.COLUMN_NAME, null, null);
ArrayList<String> labelsContact = new ArrayList<String>();
while (cursorContact.moveToNext()) {
// GET COLUMN INDICES + VALUES OF THOSE COLUMNS
int idContact = cursorContact.getInt(cursorContact
.getColumnIndex(ContactDBmoy._ID));
String nameContact = cursorContact.getString(cursorContact
.getColumnIndex(ContactDBmoy.COLUMN_NAME));
Log.i("LOG_TAG", "ROW " + idContact + " HAS NAME " + nameContact);
labelsContact.add(nameContact);
// Creating adapter for spinner
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, labelsContact);
// Drop down layout style - list view with radio button
dataAdapter
.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
dataAdapter.notifyDataSetChanged();
// attaching data adapter to spinner
spContact.setAdapter(dataAdapter);
}
cursorContact.close();
}
public Zaselenie() {
// TODO Auto-generated constructor stub
}
@Override
protected void onResume() {
super.onResume();
}
@Override
protected void onStop() {
super.onStop();
// закрываем соединения с базой данных
sdb.close();
sdb2.close();
cqh.close();
kdb.close();
}
// * Методы для кнопок рядом со спиннерами
public void onClickKvartAdd(View v) {
Intent kvartAdd = new Intent(this, Kvartiry.class);
startActivity(kvartAdd);
}
public void onClickContAdd(View v) {
Intent contAdd = new Intent(this, Contact.class);
startActivity(contAdd);
}
// * Методы для вызова диалогов даты и времени
public void onClickDateStart(View v) {
DialogFragment dateFragment = new DatePickerFragmentS();
dateFragment.show(getFragmentManager(), "datePicker");
}
public void onClickDateEnd(View v) {
DialogFragment dateFragment = new DatePickerFragmentE();
dateFragment.show(getFragmentManager(), "datePicker");
}
public void onClickTimeStart(View view) {
DialogFragment timeFragment = new TimePickerFragmentS();
timeFragment.show(getFragmentManager(), "timePicker");
}
public void onClickTimeEnd(View view) {
DialogFragment timeFragment = new TimePickerFragmentE();
timeFragment.show(getFragmentManager(), "timePicker");
}
// Convenience wrapper for internal Calendar instance
public long getDateTimeMillis() {
return c.getTimeInMillis();
}
public void onDatePickedS(Calendar date) {
// выводим выбранную дату в текстовой метке 461
mYear = date.get(Calendar.YEAR);
mMonth = date.get(Calendar.MONTH) + 1;
mDay = date.get(Calendar.DAY_OF_MONTH);
updateDisplayStart();
}
public void onDatePickedE(Calendar date) {
// выводим выбранную дату в текстовой метке 461
mYear = date.get(Calendar.YEAR);
mMonth = date.get(Calendar.MONTH) + 1;
mDay = date.get(Calendar.DAY_OF_MONTH);
updateDisplayEnd();
}
public void onTimePickerS(Calendar time) {
// выводим выбранную дату в текстовой метке 461
mHour = time.get(Calendar.HOUR);
mMinute = time.get(Calendar.MINUTE);
updateDisplayStart();
}
public void onTimePickerE(Calendar time) {
mHour = time.get(Calendar.HOUR);
mMinute = time.get(Calendar.MINUTE);
updateDisplayEnd();
}
// обновляем дату для вывода в TextView
public void updateDisplayStart() {
etDateStart.setText(new StringBuilder().append(mDay).append(".")
.append(mMonth).append(".").append(mYear));
etTimeStart.setText(new StringBuilder().append(mHour).append(":")
.append(mMinute));
}
public void updateDisplayEnd() {
etDateEnd.setText(new StringBuilder().append(mDay).append(".")
.append(mMonth).append(".").append(mYear));
etTimeEnd.setText(new StringBuilder().append(mHour).append(":")
.append(mMinute));
}
}
答案 0 :(得分：1)
TimePicker是用于选择 24小时或 AM / PM 模式的时间的视图。
您可以将setIs24HourView(true)方法与TimePicker.
timePicker = (TimePicker) findViewById(R.id.timePicker1);
timePicker.setIs24HourView(true);
timePicker.setCurrentHour(Calendar.get(Calendar.HOUR_OF_DAY));
Days.daysBetween(start.toDateMidnight() , end.toDateMidnight() ).getDays()
其中'start'和'end'是您的DateTime个对象。要将日期字符串解析为DateTime对象，请使用parseDateTime method
Calendar thatDay = Calendar.getInstance();
thatDay.set(Calendar.DAY_OF_MONTH,25);
thatDay.set(Calendar.MONTH,7); // 0-11 so 1 less
thatDay.set(Calendar.YEAR, 1985);
Calendar today = Calendar.getInstance();
long diff = today.getTimeInMillis() - thatDay.getTimeInMillis(); //result in millis
long days = diff / (24 * 60 * 60 * 1000); // approximation
如果从字符串解析日期。你可以用
String strThatDay = "1990/06/20";
SimpleDateFormat formatter = new SimpleDateFormat("yyyy/MM/dd");
Date d = null;
try {
d = formatter.parse(strThatDay);
} catch (ParseException e) {
System.err.println("Error: " + e.getMessage());
}
Calendar thatDay = Calendar.getInstance();
thatDay.setTime(d); //rest is the same....