在Android应用程序中显示当前时间和日期

Display the current time and date in an Android application

如何在Android应用程序中显示当前日期和时间?


好吧,没有那么难,因为有几种方法可以做到这一点。我假设你想把当前日期&时间进入TextView

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

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

在文档中可以阅读更多内容,可以在此处轻松找到
。在那里,您可以找到有关如何更改用于转换的格式的更多信息。


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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);
    }

}

enter image description here


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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){
                }
            }
    }
}


显示时间的显而易见的选择是AnalogClock视图和DigitalClock视图。

例如,以下布局:

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<?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>

看起来像这样:

screenshot


如果您需要一行代码:

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

结果是"2016-09-25 16:50:34"


我自己的工作方案:

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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);

希望这可以帮助!


如果您想以特定模式获取日期和时间,可以使用

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

从如何获得正确格式的完整日期?:

请用

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

从当前用户设置的意义上获得有效的时间和日期格式(例如,12/24时间格式)。

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import android.text.format.DateFormat;

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

这是适合我的代码。请试试这个。这是一种从系统调用中获取时间和日期的简单方法。您需要的方法Datetime()。

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


使用:

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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);

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

使用formattedDate作为填充日期的String
就我而言:mDateButton.setText(formattedDate);


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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);

这将给出日期时间格式
2010-05-24T18:13:00


实际上,你最好使用TextClock小部件。它为您处理所有复杂性,并将尊重用户的12 / 24hr偏好。
http://developer.android.com/reference/android/widget/TextClock.html


要显示当前日期功能:

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Calendar c = Calendar.getInstance();

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

您必须要导入

import java.text.SimpleDateFormat;
import java.util.Calendar;

你必须要使用

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


只需复制此代码,希望这对您有用。

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

这将给出当前的日期和时间:

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

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

请尝试以下代码:

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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);

你可以试试这种方式

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


用于在Textview上显示当前日期和时间

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    /// 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Android - 使用源代码在Android Studio示例中显示当前日期和时间


要获取当前时间/日期,请使用以下代码段:

要使用时间:

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

使用日期:

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

你很高兴。


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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";
}