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【065】◀▶ Android (II) - Java 等

●·● 目录:

package: android.lang

A1 ………… Boolean 类
A2 ………… Byte 类
A3 ………… Integer 类
A4 ………… Float 类
A5 ………… String 类
A6 ………… Thread 类
A7 ………… System 类
A8 ………… ListView 类

package: android.app

D1 ………… AlertBuilder.Builder 类
       DialogInterface 接口
       DialogInterface.OnClickListener 接口
       LayoutInflater 类
D2 ………… ProgressDialog 类
D3 ………… NotificationManager 类
D4 ………… Notification 类
D5 ………… PendingIntent 类 
D6 ………… TimePickerDialog 类
D7 ………… DatePickerDialog 类

package: java.text

G1 ………… DecimalFormat 类
G2 ………… SimpleDateFormat 类
G3 ………… Date 类
G4 ………… Calendar 类
G5 ………… ProgressDialog 类
G6 ………… CheckBox 类
G7 ………… ProgressBar 类
G8 ………… ListView 类

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●·● Boolean 类

1. The wrapper for the primitive type boolean.

2. Boolean Methods:

  • toString(boolean value):返回值:static String. 将指定的布尔值转化为字符串.
  • valueOf(String string):返回值:static Boolean. 将指定的字符串解析为 Boolean 对象.
  • parseBoolean(String s):返回值:static boolean. 将指定的字符串转化为布尔值.

3. Boolean Fields:

  • FALSE:false.
  • TRUE:true.
  • TYPE:Boolean 类.

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●·● Byte 类

1. The wrapper for the primitive type byte.

2. Byte Methods:

  • toString(byte value):返回值:static String. 将指定的 byte 值转化为字符串.
  • shortValue():返回值:short. 将指定的 byte 值转化为 short.
  • intValue():
  • longValue():
  • floatValue():
  • doubleValue():
  • byteValue():
  • decode(String string):返回值:static Byte. 将指定的字符串解码成 Byte 实例, 前提是可以转.
  • valueOf(String string):返回值:static Byte. 将指定的字符串解析为 Byte 对象.
  • parseByte(String s):返回值:static byte. 将指定的字符串转化为 byte 值.

3. Byte Constants:

  • MAX_VALUE:返回值:byte. Byte 的最大值, 27-1.
  • MIN_VALUE:返回值:byte. Byte 的最小值, -27.
  • SIZE:返回值:int. Byte 所占的位, 8.
System.out.println(Byte.decode("123"));  //123
System.out.println(Byte.decode("077"));  //63
System.out.println(Byte.decode("0x2F"));  //47

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●·● Integer 类

1. The wrapper for the primitive type int.

2. Byte Methods:

  • toString(int int):返回值:static String. 将指定的 int 值转化为字符串.
  • shortValue():返回值:short. 将指定的 byte 值转化为 short.
  • intValue():
  • longValue():
  • floatValue():
  • doubleValue():
  • byteValue():
  • decode(String string):返回值:static Integer. 将指定的字符串解码成 Integer 实例, 前提是可以转.
  • valueOf(String string):返回值:static Integer. 将指定的字符串解析为 Integer 对象.
  • parseInt(String s):返回值:static int. 将指定的字符串转化为 int 值.
  • getInteger(String string):返回值:static Integer. 将指定的字符串解析为 Integer 对象.
  • tobinaryString(int i):返回值:static String. 转为二进制文本.
  • toHexString(int i):返回值:static String.转为十六进制文本.
  • toOctalString(int i):返回值:static String.转为八进制文本.

3. Byte Constants:

  • MAX_VALUE:返回值:int. Integer 的最大值, 231-1.
  • MIN_VALUE:返回值:int. Integer 的最小值, -231.
  • SIZE:返回值:int. Integer 所占的位, 32.

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●·● Float 类

1. The wrapper for the primitive type int.

2. Float Constructs:

  • Float(float value)
  • Float(double value)
  • Float(String string)

3. Byte Methods:

  • toString(int int):返回值:static String. 将指定的 int 值转化为字符串.
  • intValue():
  • floatValue():
  • doubleValue():
  • longValue():

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●·● String 类

1. The wrapper for the primitive type int.

2. Byte Methods:

  • indexOf(String):
  • indexOf(String subString, int start):
  • lastIndexOf(String):
  • length():
  • replace(CharSequence target, CharSequence replacement):
  • replace(char oldChar, char newChar):
  • substring(int start):
  • substring(int start, int end):
  • toCharArray():
  • toUpperCase():
  • trim():
  • valueOf(double value):将其他的数据类型转为 String.(long, Object, int, float...)
  • toLowerCase():
  • startsWith(String prefix):
  • endsWith(String suffix):

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●·● Thread 类

1. The wrapper for the primitive type int.

2. Thread Constructors:

  • Thread():构造一个没有 Runnable 对象并且新生成名称的线程.
  • Thread(Runnable runnable):构造一个有 Runnable 对象并且新生成名称的线程.
        举个例子
    new Thread(new Runnable(){
        public void run(){
            for (int i=1; i<=15; i++) {
                try {
                    //---simulate doing something lengthy---
                    Thread.sleep(1000);
                    //---update the dialog---
                    progressDialog.incrementProgressBy((int)(100/15));
                } catch (InterruptedException e) {                    
                    e.printStackTrace();
                }
            }
            progressDialog.dismiss();
        }
    }).start();
  • Thread(Runnable runnable, String threadName):构造一个有 Runnable 对象并且指定名称的线程.
  • Thread(String threadName):构造一个没有 Runnable 对象但是有指定名称的线程.

3. Thread Methods:

  • activeCount():返回值:static int. 返回激活进程的个数.
  • currentThread():返回值:static Thread. 返回当前的进程.
  • sleep(long millis):返回值:static void. 休眠指定的时间.
  • start():开始执行线程.
  • suspend():不推荐.
  • stop():不推荐.
  • getId():返回值:long. 返回线程的 Id.
  • getName():返回值:String. 返回线程的名称.
  • getPriority():返回值:int. 返回线程的优先级.
  • isAlive():返回值:boolean. 返回线程是否还在运行.
  • run():
  • setName(String threadName):
  • setPriority(int priority):
  • notify():
  • notifyAll():
  • wait():
  • wait(long millis):

4. Thread Constants:

  • MAX_PRIORITY:对于一个线程的最大优先级值.
  • MIN_PRIORITY:对于一个线程的最小优先级值.
  • NORM_PRIORITY:给线程分配的默认优先级值.

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●·● System 类

1. Provides access to system-related information and resources including standard input and output.

2. System Methods:

  • currentTimeMillis():返回值:static long. 返回当前系统时间的微秒值, 从 1970.1.1 00:00:00 UTC 算起.



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●·● AlertDialog.Builder 类

1. 构造一个 AlertDialog, 是 AlertDialog 的嵌套类.

2. AlertDialog.Builder Methods:

  • setTitle(CharSequence title):标题内容.
  • setTitle(int titleId):
  • setIcon(int iconId):在标题左边上图标.
  • setTitle(Drawable icon):
  • setTitle(int messageId):显示的信息内容.
  • setTitle(CharSequence message):
  • setCancelable(boolean cancelable):是否可以通过返回按钮撤销弹出框.
  • setPositiveButton(int textId, DialogInterface.OnClickListener listener):设置"确定"按钮, 及其点击事件.
  • setPositiveButton(CharSequence text, DialogInterface.OnClickListener listener):
  • setNeutralButton(int textId, DialogInterface.OnClickListener listener):设置"中间"按钮, 及其点击事件.
  • setNeutralButton(CharSequence text, DialogInterface.OnClickListener listener):
  • setNegativeButton(int textId, DialogInterface.OnClickListener listener):设置"取消"按钮, 及其点击事件.
  • setNegativeButton(CharSequence text, DialogInterface.OnClickListener listener):
  • setOnCancelListener(DialogInterface.OnCancelListener onCancelListener):当执行 cancel() 时触发的事件.

  • setSingleChoiceItems(CharSequence[] items, int checkedItem, DialogInterface.OnClickListener listener):在对话框中设置 list, 同时包含单选按钮.
  • setSingleChoiceItems(ListAdapter adapter, int checkedItem, DialogInterface.OnClickListener listener):
  • setSingleChoiceItems(int itemsId, int checkedItem, DialogInterface.OnClickListener listener):
  • setSingleChoiceItems(Cursor cursor, int checkedItem, String labelColumn, DialogInterface.OnClickListener listener):
  • setMultiChoiceItems(CharSequence[] items, boolean[] checkedItems, DialogInterface.OnMultiChoiceClickListener listener):
      在对话框中设置 list, 同时包含复选按钮.
      第一个参数:显示的每一个条目.  eg: CharSequence[] items = { "Google", "Apple", "Microsoft" };

      第二个参数:每个条目对应的布尔值, 是否选中复选框.  eg: boolean[] itemsChecked = new boolean [items.length]; (默认都为false)
      第三个参数:条目被点击的时候触发的事件.
      
        一连串的实现方法, 没有命名新的实例
    protected Dialog onCreateDialog1() { 
        return new AlertDialog.Builder(this)
        .setIcon(R.drawable.ic_launcher)
        .setTitle("This is a dialog with some simple text...")
        .setMultiChoiceItems(items, itemsChecked, 
            new DialogInterface.OnMultiChoiceClickListener() {                    
                public void onClick(DialogInterface dialog, 
                int which, boolean isChecked) {
                    Toast.makeText(getBaseContext(),
                        items[which] + (isChecked ? " checked!":" unchecked!"), 
                        Toast.LENGTH_SHORT).show();
                }
            }
        ).create();
    }
  • setMultiChoiceItems(Cursor cursor, String isCheckedColumn, String labelColumn, DialogInterface.OnMultiChoiceClickListener listener):
  • setMultiChoiceItems(int itemsId, boolean[] checkedItems, DialogInterface.OnMultiChoiceClickListener listener):
  • setItems(int itemsId, DialogInterface.OnClickListener listener):在对话框中设置 list.
  • setItems(CharSequence[] items, DialogInterface.OnClickListener listener):局部变量要用 final.

  • setView(View view):
  • setOnItemSelectedListener(AdapterView.OnItemSelectedListener listener):
  • setOnKeyListener(DialogInterface.OnKeyListener onKeyListener):
  • setAdapter(ListAdapter adapter, DialogInterface.OnClickListener listener):
  • getContext():获取对应 context.
  • create():返回值:AlertDialog. 创建.
  • show():返回值:AlertDialog. 显示.

※ 参考:Android 对话框(Dialog)大全 建立你自己的对话框

●·● DialogInterface 接口对话框接口, 包括下面的嵌套类.

来源:android.content.DialogInterface

  • cancel():取消对话框.
  • dismiss():取消对话框.(功能差不多, 不同在于不能接受取消的事件)

●·● DialogInterface.OnClickListener 类:对话框中的按钮被点击的处理事件.

  • onClick(DialogInterface dialog, int which):当按钮被点击的时候将会唤醒. dialog 表示对话框, which 表示 Items 中索引.

☀☀☀<< 举例 >>☀☀☀ 

效果:

点击按钮实现 & 对话框方法:

    View Code
public boolean onKeyDown(int keyCode, KeyEvent event) {
    // TODO Auto-generated method stub
    if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {  //点击"返回键"时触发.
        dialog();
    }
    return false;
}
    View Code
protected void dialog(){
    AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
    builder.setTitle("请输入");              //标题
    builder.setIcon(android.R.drawable.ic_dialog_info);  //图标
    builder.setView(new EditText(MainActivity.this));  //TextView
    builder.setPositiveButton("Yes", null);      //Yes
    builder.setNegativeButton("No", null);      //No
    builder.create().show();
}

效果:

XML: dialog.xml

    dialog.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/dialog"
    android:layout_width="wrap_content"
    android:layout_height="match_parent" >
    
     <EditText 
         android:layout_height="wrap_content"
           android:layout_width="165dip"
           android:id="@+id/etname" 
         android:layout_marginRight="20dip"
           android:layout_alignParentRight="true"
           android:minWidth="100dip"/>
    
     <TextView 
         android:layout_height="wrap_content"
            android:layout_width="80dip"
            android:textColor="#fff"
            android:textSize="20sp"
            android:layout_marginLeft="20dip"
            android:layout_alignBaseline="@id/etname"
           android:id="@+id/tvname" 
           android:text="账号:" />
     
     <EditText 
         android:layout_height="wrap_content"
           android:layout_width="165dip"
           android:password="true"
         android:layout_marginRight="20dip"
           android:layout_below="@id/etname"
           android:layout_alignLeft="@id/etname"
           android:layout_alignParentRight="true"
           android:id="@+id/etname2" 
           android:minWidth="100dip"/>
     
     <TextView 
         android:layout_height="wrap_content"
            android:layout_width="80dip"
            android:textColor="#fff"
            android:textSize="20sp"
            android:layout_alignBaseline="@id/etname2"
           android:layout_alignLeft="@id/tvname"
           android:id="@+id/tvname2" 
           android:text="密码:" />

     <LinearLayout
         android:orientation="horizontal"
         android:layout_centerHorizontal="true"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_below="@+id/etname2" >
         
         <CheckBox
             android:id="@+id/checkBox1"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:textColor="#fff"
             android:layout_marginRight="20dip"
             android:checked="true"
             android:text="记住密码" />
     
          <CheckBox
             android:id="@+id/checkBox2"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:textColor="#fff"
             android:text="自动登录" />
    
     </LinearLayout>
     
</RelativeLayout>

Java:

    View Code
    protected void dialogItem(){
        AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
        LayoutInflater inflater = getLayoutInflater();
        View layout = inflater.inflate(R.layout.dialog, (ViewGroup)findViewById(R.id.dialog));
        builder.setTitle("账号登陆");
        builder.setIcon(android.R.drawable.ic_menu_compass);  //添加系统自带图标
        builder.setView(layout);        //添加布局
        builder.setPositiveButton("登录", null);
        builder.setNegativeButton("取消", null);
        builder.create().show();
    }

●·● LayoutInflater 类:将一个 XML 文件的布局转化成 View 对象.

来源:android.view.LayoutInflater

  • inflate(int resource, ViewGroup root):返回值:View. 通过 xml 文件及布局转换为 View.
  • inflate(XmlPullParser parser, ViewGroup root):
  • inflate(XmlPullParser parser, ViewGroup root, boolean attachToRoot):
  • inflate(int resource, ViewGroup root, boolean attachToRoot):

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●·● ProgressDialog 类

1. 带进度条的对话框, 创建实例可以返回 static ProgressDialog 的 show 方法实现.

2. ProgressDialog Methods:

  • getMax():获取进度条的最大进度.
  • getProgress():获取进度条的进度.
  • getSecondaryProgress():获取第二进度条的进度.
  • incrementProgressBy(int diff):进度条进度的增加量.
        进度随时间逐渐增加
    new Thread(new Runnable(){
        public void run(){
            for (int i=1; i<=15; i++) {
                try {
                    //---simulate doing something lengthy---
                    Thread.sleep(1000);
                    //---update the dialog---
                    progressDialog.incrementProgressBy((int)(100/15));
                } catch (InterruptedException e) {                    
                    e.printStackTrace();
                }
            }
            progressDialog.dismiss();
        }
    }).start();
  • incrementSecondaryProgressBy(int diff):第二进度条进度的增加量.
  • onStart():
  • dismiss():关掉对话框.
  • setMax(int max):设置进度条的最大进度.
  • setMessage(CharSequence message):
  • setProgress(int value):设置进度条的进度.
  • setProgressStyle(int style):设置进度条的样式.
      STYLE_HORIZONTAL:水平进度条.
      STYLE_SPINNER:旋转进度条.
  • setSecondaryProgress(int secondaryProgress):设置第二进度条的进度.

  • setButton(CharSequence text, Message msg):废弃了.
  • setButton(CharSequence text, DialogInterface.OnClickListener listener):废弃了.
  • setButton(int whichButton, CharSequence text, Message msg)
      第一个参数:从下面三个常量中选择.
        BUTTON_NEGATIVE
        BUTTON_NEUTRAL
        BUTTON_POSITIVE
      第二个参数:按钮上面显示的文本.
      第三个参数:按钮点击的时候, message 被发送.
  • setButton(int whichButton, CharSequence text, DialogInterface.OnClickListener listener)
      第三个参数:按钮的点击事件.


  • show():此方法非静态, 其他的重载方法都是静态的~
  • show(Context context, CharSequence title, CharSequence message):返回值:static ProgressDialog.
      第一个参数:activity.
      第二个参数:
    进度对话框显示的标题. (蓝色字)
      第三个参数:进度对话框进度条旁边显示的内容. (白色字)
      
  • show(Context context, CharSequence title, CharSequence message, boolean indeterminate):
      第四个参数:若为 true, 则进度条不确定地从左向右滚动.
      ※ 参考:http://zhidao.baidu.com/question/307371372.html
      
  • show(Context context, CharSequence title, CharSequence message, boolean indeterminate, boolean cancelable):
      第五个参数:是否可以中途取消此进度框.
  • show(Context context, CharSequence title, CharSequence message, boolean indeterminate, boolean cancelable, DialogInterface.OnCancelListener cancelListener):
      第六个参数:当中途取消此进度框的时候触发的事件.
        实现六个参数的进度款显示, 线程睡眠 10 秒钟
    public void onClick2(View v) {
        //---show the dialog---
        final ProgressDialog dialog = ProgressDialog.show(
            this, "Doing something", "Please wait...", true , true, new DialogInterface.OnCancelListener() {
                public void onCancel(DialogInterface dialog) {
                    // TODO Auto-generated method stub
                    Toast.makeText(DialogActivity.this, "gaha", Toast.LENGTH_SHORT).show();
                }
            });
        new Thread(new Runnable(){
            public void run(){
                try {
                    //---simulate doing something lengthy---
                    Thread.sleep(10000);
                    //---dismiss the dialog---
                    dialog.dismiss();
                } catch (InterruptedException e) {                    
                    e.printStackTrace();
                }        
            }
        }).start();
    }

※ 参考:Android学习笔记之ProgressDialog

※ 参考:android.Dialogs

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●·● NotificationManager 类

1. Class to notify the user of events that happen. This is how you tell the user that something has happened in the background.

2. NotificationManager Constructors:

  • 通过 activity 的 getSystemService(String name) 方法获取.
    NotificationManager nm = (NotificationManager) getSystemService(NOTIFICATION_SERVICE); 

3. NotificationManager Methods:

  • cancel(int id):取消之前显示的通知.
      参数:下面发布通知时候对应的通知 ID.
  • cancel(String tag, int id):
  • cancelAll():取消之前显示的所有通知.
  • notify(int id, Notification notification):发布一条通知并显示到状态栏上.
      第一个参数:通知 ID, 用于后面取消通知使用.
      第二个参数:通知.
  • notify(String tag, Int id, Notification notification):

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●·● Notification 类

1. A class that represents how a persistent notification is to be presented to the user using the NotificationManager.

2. Notification Constructors:

  • Notification():
  • Notification(int icon, CharSequence tickerText, long when):
      第一个参数:图标.

      第二个参数:显示文本.
      第三个参数:什么时候显示.
  • Notification(Parcel parcel):

3. Notification Methods:

  • setLatestEventInfo(Context context, CharSequence contentTitle, CharSequence contentText, PendingIntent contentIntent):
      第一个参数:activity.
      第二个参数:标题内容.
      第三个参数:消息内容.
      第四个参数:

4. Notification Fields:

  • vibrate:返回值:long[].
    notif.vibrate = new long[] { 100, 250, 100, 500};
      100ms delay, vibrate for 250ms, pause for 100 ms and then vibrate for 500ms.

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●·● PendingIntent 类

1. A description of an Intent and target action to perform with it.

2. PendingIntent Methods:

  • getActivities(Context context, int requestCode, Intent[] intents, int flags):返回值:static PendingIntent.
  • getActivities(Context context, int requestCode, Intent[] intents, int flags, Bundle options):返回值:static PendingIntent.
  • getActivity(Context context, int requestCode, Intent intent, int flags):返回值:static PendingIntent.
      第一个参数:activity.
      第二个参数:请求码, 常量. (貌似没什么用)
      第三个参数:被执行 activity 的 intent.
      第四个参数:
  • getActivity(Context context, int requestCode, Intent intent, int flags, Bundle options):返回值:static PendingIntent.

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●·● TimePickerDialog 类

 

1. A dialog that prompts the user for the time of day using a TimePicker.

2. TimePickerDialog Constructors:

  • TimePickerDialog(Context context, TimePickerDialog.OnTimeSetListener callBack, int hourOfDay, int minute, boolean is24HourView):
      第一个参数:Parent.
      第二个参数:要在内部实现下面的方法, 在内部可以将设置的小时和分钟等数据传递给变量.
        onTimeSet(TimePicker view, int hourOfDay, int minute):必须实现的方法.
          第一个参数:显示的 Timepicker.
          第二个参数:设置的小时数.
          第三个参数:设置的分钟数.
      第三个参数:初始化的小时值.
      第四个参数:初始化的分钟值.
      第五个参数:是否为24小时制, 否则为AM/PM制.

  • TimePickerDialog(Context context, int theme, TimePickerDialog.OnTimeSetListener callBack, int hourOfDay, int minute, boolean is24HourView):

 

TimePickerDialog timePickerDialog = new TimePickerDialog(
        this, new TimePickerDialog.OnTimeSetListener() {
            public void onTimeSet(TimePicker view, int hourOfDay, int minuteOfHour) {
                // TODO Auto-generated method stub
                yr = view.getCurrentHour();
                month = view.getCurrentMinute();
                hour = hourOfDay;
                minute = minuteOfHour;
                SimpleDateFormat timeFormat = new SimpleDateFormat("hh:mm aa");            
                Date date = new Date(0,0,0, hour, minute);
                String strDate = timeFormat.format(date);
                Toast.makeText(getBaseContext(),"You have selected " + strDate,
                        Toast.LENGTH_SHORT).show();        
            }
        }, 10, 10, true);

 

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●·● DatePickerDialog 类

1. A simple dialog containing an DatePicker.

2. DatePickerDialog Constructors:

  • DatePickerDialog(Context context, DatePickerDialog.OnDateSetListener callBack, int year, int monthOfYear, int dayOfMonth):
  • DatePickerDialog(Context context, int theme, DatePickerDialog.OnDateSetListener callBack, int year, int monthOfYear, int dayOfMonth):




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●·● DecimalFormat 类

1. 小数格式.

2. DecimalFormat Constructors: 

  • DecimalFormat():
  • DecimalFormat(String pattern):初始化指定样式的小数格式.
  • DecimalFormat(String pattern, DecimalFormatSymbols value):

3. DecimalFormat Methods:

  • applyPattern(String pattern):应用样式.
  • format(double value):返回值:String. 返回指定样式的字符串.(用于输出)
  • format(long value):返回值:String. 返回指定样式的字符串.(用于输出)

※ 参考:DecimalFormat的用法

※ 参考:DecimalFormat的用法介绍

※ 参考:11.8.2 DecimalFormat类

SymbolLocationLocalized?Meaning
0 Number Yes 数字.
@ Number No 有效数字.
# Number Yes 数字, 前面的 0 不显示.
. Number Yes 小数分隔符.
- Number Yes 负号.
, Number Yes 分组符, 逗号.
E Number Yes 科学技术法, 指数.
+ Exponent Yes 正号.
; Subpattern boundary Yes 分隔正数和负数子模式.
% Prefix or suffix Yes 乘以 100 并显示为百分数.
(\u2030) Prefix or suffix Yes 乘以 1000 并显示为千分数.
¤ (\u00A4) Prefix or suffix No 货币记号,由货币符号替换。如果两个同时出现,则用国际货币符号替换。如果出现在某个模式中,则使用货币小数分隔符,而不使用小数分隔符。
' Prefix or suffix No 用于在前缀或或后缀中为特殊字符加引号,例如 "'#'#" 将 123 格式化为 "#123"。要创建单引号本身,请连续使用两个单引号:"# o''clock"
* Prefix or suffix boundary Yes NEW  Pad escape, precedes pad character.

有效数字显示, 最小的有效数字个数用'@'表示, 最大的有效数字个数用'@'和'#'的和来表示

PatternMinimum significant digitsMaximum significant digitsNumberOutput of format()
@@@ 3 3 12345 12300
@@@ 3 3 0.12345 0.123
@@## 2 4 3.14159 3.142
@@## 2 4 1.23004 1.23
普通格式显示(#可有可无, 0必须显示)
pattern value Output of format()
0.0 1234.5678 1234.6
00000.000 kg 1234.5678 01234.568 kg
##000.000 kg 1234.5678 1234.568 kg
-000.000 1234.5678 -1234.568
-0,000.0# 1234.5678 -1,234.57
0.00E000 1234.5678 1.23E003
0.00% 1234.5678 123456.79%
0.00/u2030 1234.5678 1234567.89‰

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●·● SimpleDateFormat 类

 

1. 简单的日期格式. 将日期转换为 String 类型.

2. SimpleDateFormat Constructors:

  • SimpleDateFormat()
  • SimpleDateFormat(String pattern)
      样式可以自己写进去
      yy:年(两位)
      yyyy:年(四位)
      MM:月份
      dd:日期
      hh, HH:小时
      mm:分钟
      ss
      aa:AM & PM
                     yyyy-MM-dd 1970-01-01
               yyyy-MM-dd HH:mm 1970-01-01 00:00
       yyyy-MM-dd HH:mm:ss.SSSZ 1970-01-01 00:00:00.000+0000

3. SimpleDateFormat Methods:

  • format(Date date):以预设的模式显示成文本.

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●·● Date 类

1. 日期.

2. Date Constructors:

  • Date()
  • Date(int year, int month, int day):month 从 0 开始的~
  • Date(int year, int month, int day, int hour, int minute)
  • Date(int year, int month, int day, int hour, int minute, int second)
  • Date(long milliseconds)
  • Date(String string)

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●·● Calendar 类

1. 日历.

 

Calendar rightNow = Calendar.getInstance()

 

2. Calendar Methods:

  • get(int field):返回值:int. 获取指定的值. 传递的参数为下面的常量.

3. Calendar Constants:

  • DAY_OF_MONTH
  • DAY_OF_WEEK
  • DAY_OF_WEEK_IN_MONTH
  • DAY_OF_YEAR
  • HOUR_OF_DAY
  • MONTH
  • WEEK_OF_MONTH
  • WEEK_OF_YEAR
  • YEAR

 

 

 

posted on 2012-07-28 16:41  McDelfino  阅读(449)  评论(0编辑  收藏  举报