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Added in API level 1

Chronometer

public class Chronometer
extends TextView

java.lang.Object
↳	android.view.View
	↳	android.widget.TextView
		↳	android.widget.Chronometer

实现简单定时器的类。

您可以在 elapsedRealtime()时基中给它一个开始时间，并 elapsedRealtime()计算出来，或者如果您不给它一个基准时间，它将使用您拨打 start()的时间。

通过将 setCountDown(boolean)设置为true，计时器也可以向下计算基准时间。

默认情况下，它将以“MM：SS”或“H：MM：SS”的形式显示当前计时器值，或者可以使用 setFormat(String)将计时器值格式化为任意字符串。

Summary

Nested classes
`interface`	`Chronometer.OnChronometerTickListener` 一个回调，通知天文钟自己增加的时间。

XML attributes
`android:countDown`	Specifies whether this Chronometer counts down or counts up from the base.
`android:format`	Format string: if specified, the Chronometer will display this string, with the first "%s" replaced by the current timer value in "MM:SS" or "H:MM:SS" form.

Inherited XML attributes

From class android.widget.TextView

`android:autoLink`	Controls whether links such as urls and email addresses are automatically found and converted to clickable links.
`android:autoText`	If set, specifies that this TextView has a textual input method and automatically corrects some common spelling errors.
`android:breakStrategy`	Break strategy (control over paragraph layout).
`android:bufferType`	Determines the minimum type that getText() will return.
`android:capitalize`	If set, specifies that this TextView has a textual input method and should automatically capitalize what the user types.
`android:cursorVisible`	Makes the cursor visible (the default) or invisible.
`android:digits`	If set, specifies that this TextView has a numeric input method and that these specific characters are the ones that it will accept.
`android:drawableBottom`	The drawable to be drawn below the text.
`android:drawableEnd`	The drawable to be drawn to the end of the text.
`android:drawableLeft`	The drawable to be drawn to the left of the text.
`android:drawablePadding`	The padding between the drawables and the text.
`android:drawableRight`	The drawable to be drawn to the right of the text.
`android:drawableStart`	The drawable to be drawn to the start of the text.
`android:drawableTint`	Tint to apply to the compound (left, top, etc.) drawables.
`android:drawableTintMode`	Blending mode used to apply the compound (left, top, etc.) drawables tint.
`android:drawableTop`	The drawable to be drawn above the text.
`android:editable`	If set, specifies that this TextView has an input method.
`android:editorExtras`	Reference to an `<input-extras>` XML resource containing additional data to supply to an input method, which is private to the implementation of the input method.
`android:elegantTextHeight`	Elegant text height, especially for less compacted complex script text.
`android:ellipsize`	If set, causes words that are longer than the view is wide to be ellipsized instead of broken in the middle.
`android:ems`	Makes the TextView be exactly this many ems wide.
`android:fontFamily`	Font family (named by string) for the text.
`android:fontFeatureSettings`	Font feature settings.
`android:freezesText`	If set, the text view will include its current complete text inside of its frozen icicle in addition to meta-data such as the current cursor position.
`android:gravity`	Specifies how to align the text by the view's x- and/or y-axis when the text is smaller than the view.
`android:height`	Makes the TextView be exactly this many pixels tall.
`android:hint`	Hint text to display when the text is empty.
`android:hyphenationFrequency`	Frequency of automatic hyphenation.
`android:imeActionId`	Supply a value for `EditorInfo.actionId` used when an input method is connected to the text view.
`android:imeActionLabel`	Supply a value for `EditorInfo.actionLabel` used when an input method is connected to the text view.
`android:imeOptions`	Additional features you can enable in an IME associated with an editor to improve the integration with your application.
`android:includeFontPadding`	Leave enough room for ascenders and descenders instead of using the font ascent and descent strictly.
`android:inputMethod`	If set, specifies that this TextView should use the specified input method (specified by fully-qualified class name).
`android:inputType`	The type of data being placed in a text field, used to help an input method decide how to let the user enter text.
`android:letterSpacing`	Text letter-spacing.
`android:lineSpacingExtra`	Extra spacing between lines of text.
`android:lineSpacingMultiplier`	Extra spacing between lines of text, as a multiplier.
`android:lines`	Makes the TextView be exactly this many lines tall.
`android:linksClickable`	If set to false, keeps the movement method from being set to the link movement method even if autoLink causes links to be found.
`android:marqueeRepeatLimit`	The number of times to repeat the marquee animation.
`android:maxEms`	Makes the TextView be at most this many ems wide.
`android:maxHeight`	Makes the TextView be at most this many pixels tall.
`android:maxLength`	Set an input filter to constrain the text length to the specified number.
`android:maxLines`	Makes the TextView be at most this many lines tall.
`android:maxWidth`	Makes the TextView be at most this many pixels wide.
`android:minEms`	Makes the TextView be at least this many ems wide.
`android:minHeight`	Makes the TextView be at least this many pixels tall.
`android:minLines`	Makes the TextView be at least this many lines tall.
`android:minWidth`	Makes the TextView be at least this many pixels wide.
`android:numeric`	If set, specifies that this TextView has a numeric input method.
`android:password`	Whether the characters of the field are displayed as password dots instead of themselves.
`android:phoneNumber`	If set, specifies that this TextView has a phone number input method.
`android:privateImeOptions`	An addition content type description to supply to the input method attached to the text view, which is private to the implementation of the input method.
`android:scrollHorizontally`	Whether the text is allowed to be wider than the view (and therefore can be scrolled horizontally).
`android:selectAllOnFocus`	If the text is selectable, select it all when the view takes focus.
`android:shadowColor`	Place a blurred shadow of text underneath the text, drawn with the specified color.
`android:shadowDx`	Horizontal offset of the text shadow.
`android:shadowDy`	Vertical offset of the text shadow.
`android:shadowRadius`	Blur radius of the text shadow.
`android:singleLine`	Constrains the text to a single horizontally scrolling line instead of letting it wrap onto multiple lines, and advances focus instead of inserting a newline when you press the enter key.
`android:text`	Text to display.
`android:textAllCaps`	Present the text in ALL CAPS.
`android:textAppearance`	Base text color, typeface, size, and style.
`android:textColor`	Text color.
`android:textColorHighlight`	Color of the text selection highlight.
`android:textColorHint`	Color of the hint text.
`android:textColorLink`	Text color for links.
`android:textIsSelectable`	Indicates that the content of a non-editable text can be selected.
`android:textScaleX`	Sets the horizontal scaling factor for the text.
`android:textSize`	Size of the text.
`android:textStyle`	Style (bold, italic, bolditalic) for the text.
`android:typeface`	Typeface (normal, sans, serif, monospace) for the text.
`android:width`	Makes the TextView be exactly this many pixels wide.

From class android.view.View

Inherited constants

From class android.view.View

Inherited fields

From class android.view.View

Public constructors
`Chronometer(Context context)` 初始化此Chronometer对象。
`Chronometer(Context context, AttributeSet attrs)` 使用标准视图布局信息进行初始化。
`Chronometer(Context context, AttributeSet attrs, int defStyleAttr)` 使用标准视图布局信息和样式进行初始化。
`Chronometer(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes)`

Public methods
`CharSequence`	`getAccessibilityClassName()` 返回此对象的类名称以用于辅助功能。
`long`	`getBase()` 通过 `setBase(long)`返回基准时间。
`CharSequence`	`getContentDescription()` 返回 `View`的内容描述。
`String`	`getFormat()` 返回通过 `setFormat(String)`设置的当前格式字符串。
`Chronometer.OnChronometerTickListener`	`getOnChronometerTickListener()`
`boolean`	`isCountDown()`
`void`	`setBase(long base)` 设置递增计时器参考的时间。
`void`	`setCountDown(boolean countDown)` 将此视图设置为倒数到基数，而不是从倒数开始倒数。
`void`	`setFormat(String format)` 设置用于显示的格式字符串。
`void`	`setOnChronometerTickListener(Chronometer.OnChronometerTickListener listener)` 设置在计时器更改时调用侦听器。
`void`	`start()` 开始数起来。
`void`	`stop()` 停止计数。

Protected methods
`void`	`onDetachedFromWindow()` 这是在视图从窗口分离时调用的。
`void`	`onWindowVisibilityChanged(int visibility)` 叫当包含窗口具有改变其可见性（间 `GONE` ， `INVISIBLE` ，和 `VISIBLE` ）。

Inherited methods

From class android.widget.TextView

From class android.view.View

From class java.lang.Object

From interface android.view.ViewTreeObserver.OnPreDrawListener

From interface android.graphics.drawable.Drawable.Callback

From interface android.view.KeyEvent.Callback

From interface android.view.accessibility.AccessibilityEventSource

XML attributes

android:countDown

指定此计时器是否倒计时或从基点向上计数。如果没有指定，这是错误的，天文钟计数。

必须是布尔值，可以是“ true ”或“ false ”。

这也可能是对包含此类型值的资源（形式为“ @[package:]type:name ”）或主题属性（形式为“ ?[package:][type:]name ”）的 ?[package:][type:]name 。

这对应于全局属性资源符号 countDown 。

android:format

格式化字符串：如果指定，天文台将显示此字符串，其中第一个“％s”由当前定时器值替换为“MM：SS”或“H：MM：SS”形式。如果没有指定格式字符串，天文台将显示“MM：SS”或“H：MM：SS”。

必须是字符串值，使用'\\;' 转义字符如'\\ n'或'\\ uxxxx'作为unicode字符。

这也可能是对包含此类型值的资源（形式为“ @[package:]type:name ”）或主题属性（形式为“ ?[package:][type:]name ”）的 ?[package:][type:]name 。

这对应于全局属性资源符号 format 。

Public constructors

Chronometer

Added in API level 1

Chronometer (Context context)

初始化此Chronometer对象。将基础设置为当前时间。

Parameters
`context`	`Context`

Chronometer

Added in API level 1

Chronometer (Context context, 
                AttributeSet attrs)

使用标准视图布局信息进行初始化。将基础设置为当前时间。

Parameters
`context`	`Context`
`attrs`	`AttributeSet`

Chronometer

Added in API level 1

Chronometer (Context context, 
                AttributeSet attrs, 
                int defStyleAttr)

使用标准视图布局信息和样式进行初始化。将基础设置为当前时间。

Parameters
`context`	`Context`
`attrs`	`AttributeSet`
`defStyleAttr`	`int`

Chronometer

Added in API level 21

Chronometer (Context context, 
                AttributeSet attrs, 
                int defStyleAttr, 
                int defStyleRes)

Parameters
`context`	`Context`
`attrs`	`AttributeSet`
`defStyleAttr`	`int`
`defStyleRes`	`int`

Public methods

getAccessibilityClassName

Added in API level 23

CharSequence getAccessibilityClassName ()

返回此对象的类名称以用于辅助功能。如果子类正在实现的东西应该被视为一个全新的视图类，当它被可访问性使用时，子类只应该覆盖这个子类，与它所源自的类无关。这用于填写AccessibilityNodeInfo.setClassName 。

Returns
`CharSequence`

getBase

Added in API level 1

long getBase ()

通过 setBase(long)返回基准时间。

Returns
`long`

getContentDescription

Added in API level 4

CharSequence getContentDescription ()

返回 View的内容描述。

注意：不要重写此方法，因为它将不会影响呈现给辅助功能服务的内容描述。您必须致电setContentDescription(CharSequence)修改内容说明。

Returns
`CharSequence`	the content description

getFormat

Added in API level 1

String getFormat ()

返回通过 setFormat(String)设置的当前格式字符串。

Returns
`String`

getOnChronometerTickListener

Added in API level 3

Chronometer.OnChronometerTickListener getOnChronometerTickListener ()

Returns
`Chronometer.OnChronometerTickListener`	The listener (may be null) that is listening for chronometer change events.

isCountDown

Added in API level 24

boolean isCountDown ()

Returns
`boolean`	whether this view counts down

也可以看看：

setCountDown(boolean)

setBase

Added in API level 1

void setBase (long base)

设置递增计时器参考的时间。

Parameters
`base`	`long`: Use the `elapsedRealtime()` time base.

setCountDown

Added in API level 24

void setCountDown (boolean countDown)

将此视图设置为倒数到基数，而不是从倒数开始倒数。

Parameters
`countDown`	`boolean`: whether this view should count down

也可以看看：

setBase(long)

setFormat

Added in API level 1

void setFormat (String format)

设置用于显示的格式字符串。计时器将显示此字符串，第一个“％s”由当前定时器值替换为“MM：SS”或“H：MM：SS”形式。如果格式字符串为空，或者您从不调用setFormat（），则计时器将以“MM：SS”或“H：MM：SS”形式显示计时器值。

Parameters
`format`	`String`: the format string.

setOnChronometerTickListener

Added in API level 3

void setOnChronometerTickListener (Chronometer.OnChronometerTickListener listener)

设置在计时器更改时调用侦听器。

Parameters
`listener`	`Chronometer.OnChronometerTickListener`: The listener.

start

Added in API level 1

void start ()

开始数起来。这不会影响从setBase(long)设置的setBase(long) ，只是视图显示。即使在Widget不可见的情况下，计时器也会定期将消息安排到处理程序。为了确保不会发生资源泄漏，用户应确保每个start（）调用与stop()有相互呼叫。

stop

Added in API level 1

void stop ()

停止计数。这不会影响从setBase(long)设置的setBase(long) ，只是视图显示。这将停止向处理程序发送消息，通过start()有效释放将在计时器运行时start() 。

Protected methods

onDetachedFromWindow

Added in API level 1

void onDetachedFromWindow ()

这是在视图从窗口分离时调用的。此时它不再有绘图表面。

onWindowVisibilityChanged

Added in API level 1

void onWindowVisibilityChanged (int visibility)

叫当包含窗口具有改变其可见性（间GONE ， INVISIBLE ，和VISIBLE ）。请注意，这会告诉您窗口管理器是否使您的窗口可见; 这并不能告诉你你的窗口是否被屏幕上的其他窗口遮挡，即使它本身是可见的。

Parameters
`visibility`	`int`: The new visibility of the window.

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Results for

Chronometer

Summary

Nested classes

XML attributes

Inherited XML attributes

Inherited constants

Inherited fields

Public constructors

Public methods

Protected methods

Inherited methods

XML attributes

android:countDown

android:format

Public constructors

Chronometer

Chronometer

Chronometer

Chronometer

Public methods

getAccessibilityClassName

getBase

getContentDescription

getFormat

getOnChronometerTickListener

isCountDown

setBase

setCountDown

setFormat

setOnChronometerTickListener

start

stop

Protected methods

onDetachedFromWindow

onWindowVisibilityChanged