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テキスト


AnalogClock

農(nóng)民伯伯

版本:Android 2.2 r1

?

public class AnalogClock extends View

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java.lang.Object

android.view.View

? ???? android.widget.AnalogClock

?

概述

????????

???????? 這個(gè)控件是一個(gè)帶有時(shí)針和分針的模擬時(shí)鐘。

?

受保護(hù)方法

???????? protected void onAttachedToWindow ()

???????? 視圖(AnalogClock)附在窗體時(shí)調(diào)用。在調(diào)用時(shí),視圖在窗體表面并開始繪制。注意保證這個(gè)方法在onDraw(Canvas)以前被調(diào)用,但是它可以在首次onDraw以前任何時(shí)間調(diào)用——包括onMeasure(int, int)之前或之后。

?

???????? protected void onDetachedFromWindow ()

???????? 視圖(DigitalClock)從窗體上分離(移除)時(shí)調(diào)用,同時(shí)窗體表面不再繪制視圖。

?

???????? protected void onDraw (Canvas canvas)

???????? 實(shí)現(xiàn)你自己的繪制。

?????????????????? 參數(shù)

??????????????????????????? canvas ?? 在畫布上繪制背景

?

???????? protected void onMeasure (int widthMeasureSpec, int heightMeasureSpec)

測(cè)量這個(gè)視圖以確定其內(nèi)容的高度和寬度。通過(guò)measure(int, int)來(lái)調(diào)用這個(gè)方法,并且應(yīng)該由子類重寫以提高內(nèi)容測(cè)量的效率和精確度。

約定:當(dāng)該方法被重寫時(shí),你必須調(diào)用setMeasuredDimension(int, int)來(lái)存儲(chǔ)已測(cè)量視圖的高度和寬度。否則將通過(guò)measure(int, int)拋出一個(gè)IllegalStateException異常。調(diào)用父類的onMeasure(int, int)方法是一個(gè)有效的辦法。

父類的實(shí)現(xiàn)是以背景大小為默認(rèn)大小,除非MeasureSpec(測(cè)量細(xì)則)允許更大的背景。? 為了更好測(cè)量?jī)?nèi)容子類應(yīng)該重寫onMeasure(int, int)。

如果這個(gè)方法被重寫,子類有責(zé)任確保測(cè)量它的高度和寬度至少是視圖的最小寬度和高度(getSuggestedMinimumHeight()getSuggestedMinimumWidth())。

參數(shù)

widthMeasureSpec ??????? 由于父類有橫向空間要求,參見(jiàn)View.MeasureSpec。

??????????????????????????? heightMeasureSpec ?????? 由于父類有縱向空間要求,參見(jiàn)View.MeasureSpec。

?

???????? protected void onSizeChanged (int w, int h, int oldw, int oldh)

???????? 布局期間當(dāng)視圖的大小發(fā)生改變時(shí)調(diào)用。如果只是添加到視圖,調(diào)用時(shí)顯示的是舊值0。(譯者注:也就是添加到視圖時(shí),oldwoldh返回的是0

???????? ???????? 參數(shù)

???????? w ??? 視圖當(dāng)前寬度

???????? h ???? 視圖當(dāng)前高度

???????? oldw ?????? 視圖以前的寬度

???????? oldh ??????? 視圖以前的高度


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