文章选自StackOverflow（简称：SOF）精选问答汇总系列文章之一，本系列文章将为读者分享国外最优质的精彩问与答，供读者学习和了解国外最新技术。本文探讨Android显示当前日期和时间的方法。
问题：
如何在Android应用中显示当前日期和时间？
答案：
这个有多种解决方法。我假设你想把当前日期和时间放在TextView上。
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String currentDateTimeString = DateFormat.getDateTimeInstance().format(newDate());
// textView is the TextView view that should display it
textView.setText(currentDateTimeString); |
文档里可以阅读更多，点击 here 。你可以在那里读到更多信息，来更改用于转换的格式。
user647826
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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 = newSimpleDateFormat("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 = newTextView(this);
txtView.setText("Current Date and Time : "+formattedDate);
txtView.setGravity(Gravity.CENTER);
txtView.setTextSize(20);
setContentView(txtView);
}
} |
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public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Thread myThread = null;
Runnable runnable = newCountDownRunner();
myThread= newThread(runnable);
myThread.start();
}public void doWork() { runOnUiThread(newRunnable() {
public void run() {
try{
TextView txtCurrentTime= (TextView)findViewById(R.id.lbltime);
Date dt = newDate();
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){
}
}
}
} |
要展示当前时间， AnalogClockView和DigitalClockView是明智的选择。
例如下面的布局：
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<?xml version="1.0"
encoding="utf-8"?>
<LinearLayout 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> |
看起来是这个样子：
我自己的展示方法：
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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);
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如果你想用特定的模式展示日期和时间，可以用这个：
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Date d = newDate();
CharSequence s = DateFormat.format("yyyy-MM-dd hh:mm:ss", d.getTime());
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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);
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这个展示日期的格式是 2010-05-24T18:13:00
这能显示当前时间和日期：
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public String getCurrDate(){ String dt;
Date cal = Calendar.getInstance().getTime();
dt = cal.toLocaleString();
return
dt;
} |
如下代码：
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SimpleDateFormat dateFormat = newSimpleDateFormat(
"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);
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原文链接：Display the current time and date in an Android application