在Android应用程序中显示当前时间和日期

这并不难，因为有几种方法可以做到这一点。我假设你想把当前的日期&时间转换为TextView。

String currentDateTimeString = java.text.DateFormat.getDateTimeInstance().format(new Date());


// textView is the TextView view that should display it
textView.setText(currentDateTimeString);

在文档中可以很容易地找到 ． 在这里你可以找到更多关于如何改变用于转换的格式的信息

显示时间的明显选择是AnalogClock视图和DigitalClock视图。

例如，如下布局:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">


<AnalogClock
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>


<DigitalClock
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:textSize="20sp"/>
</LinearLayout>

看起来是这样的:

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);


setContentView(R.layout.main);
Thread myThread = null;


Runnable runnable = new CountDownRunner();
myThread= new Thread(runnable);
myThread.start();


}


public void doWork() {
runOnUiThread(new Runnable() {
public void run() {
try{
TextView txtCurrentTime= (TextView)findViewById(R.id.lbltime);
Date dt = new Date();
int hours = dt.getHours();
int minutes = dt.getMinutes();
int seconds = dt.getSeconds();
String curTime = hours + ":" + minutes + ":" + seconds;
txtCurrentTime.setText(curTime);
}catch (Exception e) {}
}
});
}




class CountDownRunner implements Runnable{
// @Override
public void run() {
while(!Thread.currentThread().isInterrupted()){
try {
doWork();
Thread.sleep(1000);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}catch(Exception e){
}
}
}
}

我自己的工作解决方案:

Calendar c = Calendar.getInstance();


String sDate = c.get(Calendar.YEAR) + "-"
+ c.get(Calendar.MONTH)
+ "-" + c.get(Calendar.DAY_OF_MONTH)
+ " at " + c.get(Calendar.HOUR_OF_DAY)
+ ":" + c.get(Calendar.MINUTE);

希望这能有所帮助!

这将给出当前的日期和时间:

public String getCurrDate()
{
String dt;
Date cal = Calendar.getInstance().getTime();
dt = cal.toLocaleString();
return dt;
}

从如何获得正确格式的完整日期?:

请使用

android.text.format.DateFormat.getDateFormat(Context context)
android.text.format.DateFormat.getTimeFormat(Context context)

获得当前用户设置意义上的有效时间和日期格式(例如12/24时间格式)。

import android.text.format.DateFormat;


private void some() {
final Calendar t = Calendar.getInstance();
textView.setText(DateFormat.getTimeFormat(this/*Context*/).format(t.getTime()));
}

public class XYZ extends Activity {


/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.main);


Calendar c = Calendar.getInstance();
System.out.println("Current time => "+c.getTime());


SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String formattedDate = df.format(c.getTime());
// formattedDate have current date/time
Toast.makeText(this, formattedDate, Toast.LENGTH_SHORT).show();




// Now we display formattedDate value in TextView
TextView txtView = new TextView(this);
txtView.setText("Current Date and Time : "+formattedDate);
txtView.setGravity(Gravity.CENTER);
txtView.setTextSize(20);
setContentView(txtView);
}


}

如果您想以特定的模式获取日期和时间，可以使用

Date d = new Date();
CharSequence s = DateFormat.format("yyyy-MM-dd hh:mm:ss", d.getTime());

Calendar c = Calendar.getInstance();
int month=c.get(Calendar.MONTH)+1;
String sDate = c.get(Calendar.YEAR) + "-" + month+ "-" + c.get(Calendar.DAY_OF_MONTH) +
"T" + c.get(Calendar.HOUR_OF_DAY)+":"+c.get(Calendar.MINUTE)+":"+c.get(Calendar.SECOND);

试试下面的代码:

SimpleDateFormat dateFormat = new SimpleDateFormat(
"yyyy/MM/dd HH:mm:ss");


Calendar cal = Calendar.getInstance();
System.out.println("time => " + dateFormat.format(cal.getTime()));


String time_str = dateFormat.format(cal.getTime());


String[] s = time_str.split(" ");


for (int i = 0; i < s.length; i++) {
System.out.println("date  => " + s[i]);
}


int year_sys = Integer.parseInt(s[0].split("/")[0]);
int month_sys = Integer.parseInt(s[0].split("/")[1]);
int day_sys = Integer.parseInt(s[0].split("/")[2]);


int hour_sys = Integer.parseInt(s[1].split(":")[0]);
int min_sys = Integer.parseInt(s[1].split(":")[1]);


System.out.println("year_sys  => " + year_sys);
System.out.println("month_sys  => " + month_sys);
System.out.println("day_sys  => " + day_sys);


System.out.println("hour_sys  => " + hour_sys);
System.out.println("min_sys  => " + min_sys);

String formattedDate = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(Calendar.getInstance().getTime());

使用formattedDate作为你的String填充日期 在我的例子中:mDateButton.setText(formattedDate);

下面是对我有用的代码。请尝尝这个。这是一个简单的方法，从系统调用中获取时间和日期。

public static String getDatetime() {
Calendar c = Calendar .getInstance();
System.out.println("Current time => "+c.getTime());
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mms");
String formattedDate = df.format(c.getTime());
return formattedDate;
}

使用:

Calendar c = Calendar.getInstance();


int seconds = c.get(Calendar.SECOND);
int minutes = c.get(Calendar.MINUTE);
int hour = c.get(Calendar.HOUR);
String time = hour + ":" + minutes + ":" + seconds;




int day = c.get(Calendar.DAY_OF_MONTH);
int month = c.get(Calendar.MONTH);
int year = c.get(Calendar.YEAR);
String date = day + "/" + month + "/" + year;


// Assuming that you need date and time in a separate
// textview named txt_date and txt_time.


txt_date.setText(date);
txt_time.setText(time);

简单地复制此代码，并希望这为您工作良好。

Calendar c = Calendar.getInstance();
SimpleDateFormat sdf = new SimpleDateFormat("dd:MMMM:yyyy HH:mm:ss a");
String strDate = sdf.format(c.getTime());

如果你想要一行代码:

String date = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(Calendar.getInstance().getTime());

结果是"2016-09-25 16:50:34"

使用实例显示当前日期函数。

Calendar c = Calendar.getInstance();


SimpleDateFormat df = new SimpleDateFormat("dd-MMM-yyyy");
String date = df.format(c.getTime());
Date.setText(date);

您一定想导入

< p >进口java.text.SimpleDateFormat; 进口java.util.Calendar; < / p >

你一定想用

TextView Date;
Date = (TextView) findViewById(R.id.Date);

String currentDateandTime = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date());
Toast.makeText(getApplicationContext(), currentDateandTime, Toast.LENGTH_SHORT).show();

要获得当前的时间/日期，只需使用以下代码片段:

要使用时间:

SimpleDateFormat simpleDateFormatTime = new SimpleDateFormat("HH:mm", Locale.getDefault());
String strTime = simpleDateFormatTime.format(now.getTime());

要使用日期:

SimpleDateFormat simpleDateFormatDate = new SimpleDateFormat("E, MMM dd, yyyy", Locale.getDefault());
String strDate = simpleDateFormatDate.format(now.getTime());

这样就可以开始了。

为显示当前日期和时间的Textview

    /// For Show Date
String currentDateString = DateFormat.getDateInstance().format(new Date());
// textView is the TextView view that should display it
textViewdate.setText(currentDateString);
/// For Show Time
String currentTimeString = DateFormat.getTimeInstance().format(new Date());
// textView is the TextView view that should display it
textViewtime.setText(currentTimeString);

检查完整代码在Android Studio示例中显示当前日期和时间的源代码

SimpleDateFormat format = new SimpleDateFormat("dd/MM/yyyy");
Calendar c = Calendar.getInstance();
Date date = Calendar.getInstance().getTime();
String sDate = format.format(date);//31-12-9999
int mYear = c.get(Calendar.YEAR);//9999
int mMonth = c.get(Calendar.MONTH);
mMonth = mMonth + 1;//12
int hrs = c.get(Calendar.HOUR_OF_DAY);//24
int min = c.get(Calendar.MINUTE);//59
String AMPM;
if (c.get(Calendar.AM_PM) == 0) {
AMPM = "AM";
} else {
AMPM = "PM";
}

你可以试试这种方法

Calendar calendar = Calendar.getInstance();
SimpleDateFormat mdformat = new SimpleDateFormat("HH:mm:ss");
String strDate = "Current Time : " + mdformat.format(calendar.getTime());

如果你希望在android中使用日期/时间，我建议你使用ThreeTenABP，这是一个版本的java.time.*包(可从android上的API 26开始)，与Java 8一起提供，可作为java.util.Date和java.util.Calendar的替代品。

LocalDate localDate = LocalDate.now();
DateTimeFormatter formatter = DateTimeFormatter.ofLocalizedDate(FormatStyle.MEDIUM);
String date = localDate.format(formatter);
textView.setText(date);