一：TextView的onDraw()方法：

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1.第一句restartMarqueeIfNeeded()繪制字幕滾動。

protected void onDraw(Canvas canvas) {restartMarqueeIfNeeded();// Draw the background for this viewsuper.onDraw(canvas);
　　　　 ...
}

首先我們看一個東西：

android.text.TextUtils.java

public enum TruncateAt {START,MIDDLE,END,MARQUEE,/*** @hide*/END_SMALL}

很熟悉對不對，這就是平常在TextView的android:ellipsize屬性，當(dāng)字符顯示不下的時候省略號所在的位置，有開始/結(jié)束/中間/滾動四個枚舉值。每次onDraw的時候都檢測是否需要滾動字幕，重新滾幕的條件就是android:ellipsize屬性是MARQUEE(也就是滾動字幕)和mRestartMarquee 布爾值。

private void restartMarqueeIfNeeded() {if (mRestartMarquee && mEllipsize == TextUtils.TruncateAt.MARQUEE) {mRestartMarquee = false;startMarquee();}}

關(guān)于這部分就講這么多，知道這個是滾動字幕的就行了，若對滾幕感興趣自行研究canMarquee()/startMarquee()/stopMarquee()/startStopMarquee(boolean start)/Marquee類。

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2.compoundDrawable的繪制，也就是drawableTop/Bottom/Left/Right屬性。

// Draw the background for this viewsuper.onDraw(canvas);final int compoundPaddingLeft = getCompoundPaddingLeft();final int compoundPaddingTop = getCompoundPaddingTop();final int compoundPaddingRight = getCompoundPaddingRight();final int compoundPaddingBottom = getCompoundPaddingBottom();
....
final Drawables dr = mDrawables;if (dr != null) {/** Compound, not extended, because the icon is not clipped* if the text height is smaller.*/int vspace = bottom - top - compoundPaddingBottom - compoundPaddingTop;int hspace = right - left - compoundPaddingRight - compoundPaddingLeft;// IMPORTANT: The coordinates computed are also used in invalidateDrawable()// Make sure to update invalidateDrawable() when changing this code.if (dr.mShowing[Drawables.LEFT] != null) {canvas.save();canvas.translate(scrollX + mPaddingLeft + leftOffset,scrollY + compoundPaddingTop +(vspace - dr.mDrawableHeightLeft) / 2);dr.mShowing[Drawables.LEFT].draw(canvas);canvas.restore();}// IMPORTANT: The coordinates computed are also used in invalidateDrawable()// Make sure to update invalidateDrawable() when changing this code.if (dr.mShowing[Drawables.RIGHT] != null) {canvas.save();canvas.translate(scrollX + right - left - mPaddingRight- dr.mDrawableSizeRight - rightOffset,scrollY + compoundPaddingTop + (vspace - dr.mDrawableHeightRight) / 2);dr.mShowing[Drawables.RIGHT].draw(canvas);canvas.restore();}// IMPORTANT: The coordinates computed are also used in invalidateDrawable()// Make sure to update invalidateDrawable() when changing this code.if (dr.mShowing[Drawables.TOP] != null) {canvas.save();canvas.translate(scrollX + compoundPaddingLeft +(hspace - dr.mDrawableWidthTop) / 2, scrollY + mPaddingTop);dr.mShowing[Drawables.TOP].draw(canvas);canvas.restore();}// IMPORTANT: The coordinates computed are also used in invalidateDrawable()// Make sure to update invalidateDrawable() when changing this code.if (dr.mShowing[Drawables.BOTTOM] != null) {canvas.save();canvas.translate(scrollX + compoundPaddingLeft +(hspace - dr.mDrawableWidthBottom) / 2,scrollY + bottom - top - mPaddingBottom - dr.mDrawableSizeBottom);dr.mShowing[Drawables.BOTTOM].draw(canvas);canvas.restore();}} Drawables是TextView下的靜態(tài)類，持有著mShowing(drawable數(shù)組)上下左右四個drawable，這四個drawable繪制在不同的位置。

3.TextPaint和Layout，其實還有mEditor，也就是可編輯狀態(tài)下的情況(EditText)。這部分先初始化畫筆TextPaint，Cavans畫布，最重要的就是Layout，由它負(fù)責(zé)文字繪制。 Path highlight = getUpdatedHighlightPath();if (mEditor != null) {mEditor.onDraw(canvas, layout, highlight, mHighlightPaint, cursorOffsetVertical);} else {layout.draw(canvas, highlight, mHighlightPaint, cursorOffsetVertical);}

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二：Layout類

Layout是android.text下的一個抽象類，負(fù)責(zé)文字布局繪畫，它有兩個子類分別是DynamicLayout和StaticLayout，前者是可編輯狀態(tài)下的(EditText)，后者是靜態(tài)的。

　　　/*** Draw this Layout on the specified Canvas.
　　　　繪制在指定的畫布*/public void draw(Canvas c) {draw(c, null, null, 0);}/*** Draw this Layout on the specified canvas, with the highlight path drawn* between the background and the text.
在背景和文字之間繪制高亮** @param canvas the canvas* @param highlight the path of the highlight or cursor; can be null* @param highlightPaint the paint for the highlight* @param cursorOffsetVertical the amount to temporarily translate the* canvas while rendering the highlight*/public void draw(Canvas canvas, Path highlight, Paint highlightPaint,int cursorOffsetVertical) {final long lineRange = getLineRangeForDraw(canvas);//獲取需要繪制的區(qū)間行int firstLine = TextUtils.unpackRangeStartFromLong(lineRange);//第一行int lastLine = TextUtils.unpackRangeEndFromLong(lineRange);//最后一行if (lastLine < 0) return;drawBackground(canvas, highlight, highlightPaint, cursorOffsetVertical,firstLine, lastLine);drawText(canvas, firstLine, lastLine);}

1.先看畫背景：

public void drawBackground(Canvas canvas, Path highlight, Paint highlightPaint,int cursorOffsetVertical, int firstLine, int lastLine) {// First, draw LineBackgroundSpans.//首先,繪制LineBackgroundSpans(不是View的Backgrond哦)// LineBackgroundSpans know nothing about the alignment, margins, or？/它不需要自動對齊方式，間距或方向// direction of the layout or line. XXX: Should they?//xxx:需要嗎？// They are evaluated at each line.//將會應(yīng)用在每一行。if (mSpannedText) {//SpannedText才能設(shè)置Spanif (mLineBackgroundSpans == null) {mLineBackgroundSpans = new SpanSet<LineBackgroundSpan>(LineBackgroundSpan.class);}Spanned buffer = (Spanned) mText;int textLength = buffer.length();mLineBackgroundSpans.init(buffer, 0, textLength);if (mLineBackgroundSpans.numberOfSpans > 0) {//行背景span數(shù)量int previousLineBottom = getLineTop(firstLine);//記錄上一行的topint previousLineEnd = getLineStart(firstLine);//記錄上一行的endParagraphStyle[] spans = NO_PARA_SPANS;//段落樣式int spansLength = 0;TextPaint paint = mPaint;int spanEnd = 0;final int width = mWidth;for (int i = firstLine; i <= lastLine; i++) {//遍歷每行int start = previousLineEnd;int end = getLineStart(i + 1);//下一行的endpreviousLineEnd = end;int ltop = previousLineBottom;int lbottom = getLineTop(i + 1);//獲取下一行的top，也就是本行的bottompreviousLineBottom = lbottom;int lbaseline = lbottom - getLineDescent(i);if (start >= spanEnd) {// These should be infrequent, so we'll use this so that// we don't have to check as often.spanEnd = mLineBackgroundSpans.getNextTransition(start, textLength);// All LineBackgroundSpans on a line contribute to its background.spansLength = 0;// Duplication of the logic of getParagraphSpansif (start != end || start == 0) {// Equivalent to a getSpans(start, end), but filling the 'spans' local// array instead to reduce memory allocationfor (int j = 0; j < mLineBackgroundSpans.numberOfSpans; j++) {//如果設(shè)置了多個LineBackgroundSpan將一一畫上// equal test is valid since both intervals are not empty by// constructionif (mLineBackgroundSpans.spanStarts[j] >= end ||mLineBackgroundSpans.spanEnds[j] <= start) continue;spans = GrowingArrayUtils.append(spans, spansLength, mLineBackgroundSpans.spans[j]);spansLength++;}}}for (int n = 0; n < spansLength; n++) {//所有的行數(shù)和行背景(line.number*span.number)LineBackgroundSpan lineBackgroundSpan = (LineBackgroundSpan) spans[n];lineBackgroundSpan.drawBackground(canvas, paint, 0, width,ltop, lbaseline, lbottom,buffer, start, end, i);}}}mLineBackgroundSpans.recycle();//SpanSet回收}// There can be a highlight even without spans if we are drawing// a non-spanned transformation of a spanned editing buffer.if (highlight != null) {//繪制hightlight路徑(比如光標(biāo))if (cursorOffsetVertical != 0) canvas.translate(0, cursorOffsetVertical);canvas.drawPath(highlight, highlightPaint);if (cursorOffsetVertical != 0) canvas.translate(0, -cursorOffsetVertical);}}

至于lineBottom和linrEnd是由子類(DynamicLayout和StaticLayout)的getLineTop和getLineStart方法獲取的，很復(fù)雜很復(fù)雜。

2.畫字drawText：

public void drawText(Canvas canvas, int firstLine, int lastLine) {int previousLineBottom = getLineTop(firstLine);int previousLineEnd = getLineStart(firstLine);ParagraphStyle[] spans = NO_PARA_SPANS;int spanEnd = 0;TextPaint paint = mPaint;CharSequence buf = mText;Alignment paraAlign = mAlignment;TabStops tabStops = null;boolean tabStopsIsInitialized = false;TextLine tl = TextLine.obtain();// Draw the lines, one at a time.// The baseline is the top of the following line minus the current line's descent.for (int lineNum = firstLine; lineNum <= lastLine; lineNum++) {//遍歷每行int start = previousLineEnd;//開始previousLineEnd = getLineStart(lineNum + 1);//記錄endint end = getLineVisibleEnd(lineNum, start, previousLineEnd);//結(jié)束int ltop = previousLineBottom;//行topint lbottom = getLineTop(lineNum + 1);//行bottom，也就是下一行的toppreviousLineBottom = lbottom;//記錄行Bottomint lbaseline = lbottom - getLineDescent(lineNum);//行基線，bottom-descentint dir = getParagraphDirection(lineNum);//段亂排版方向int left = 0;int right = mWidth;
　　　　　　　//一：畫LeadingMarginif (mSpannedText) {//是spannedTextSpanned sp = (Spanned) buf;//textint textLength = buf.length();boolean isFirstParaLine = (start == 0 || buf.charAt(start - 1) == '\n');//段落第一行// New batch of paragraph styles, collect into spans array.// Compute the alignment, last alignment style wins.// Reset tabStops, we'll rebuild if we encounter a line with// tabs.// We expect paragraph spans to be relatively infrequent, use// spanEnd so that we can check less frequently. Since// paragraph styles ought to apply to entire paragraphs, we can// just collect the ones present at the start of the paragraph.// If spanEnd is before the end of the paragraph, that's not// our problem.if (start >= spanEnd && (lineNum == firstLine || isFirstParaLine)) {spanEnd = sp.nextSpanTransition(start, textLength,ParagraphStyle.class);spans = getParagraphSpans(sp, start, spanEnd, ParagraphStyle.class);//獲取段落樣式paraAlign = mAlignment;//段落對齊方式for (int n = spans.length - 1; n >= 0; n--) {if (spans[n] instanceof AlignmentSpan) {paraAlign = ((AlignmentSpan) spans[n]).getAlignment();break;}}tabStopsIsInitialized = false;}
　　　　　　　　　 //畫出LeadingMarginSpan// Draw all leading margin spans. Adjust left or right according// to the paragraph direction of the line.final int length = spans.length;boolean useFirstLineMargin = isFirstParaLine;for (int n = 0; n < length; n++) {if (spans[n] instanceof LeadingMarginSpan2) {int count = ((LeadingMarginSpan2) spans[n]).getLeadingMarginLineCount();int startLine = getLineForOffset(sp.getSpanStart(spans[n]));// if there is more than one LeadingMarginSpan2, use// the count that is greatestif (lineNum < startLine + count) {useFirstLineMargin = true;break;}}}for (int n = 0; n < length; n++) {if (spans[n] instanceof LeadingMarginSpan) {//LeadingMarginSpanLeadingMarginSpan margin = (LeadingMarginSpan) spans[n];if (dir == DIR_RIGHT_TO_LEFT) {//右往左margin.drawLeadingMargin(canvas, paint, right, dir, ltop,lbaseline, lbottom, buf,start, end, isFirstParaLine, this);right -= margin.getLeadingMargin(useFirstLineMargin);} else {//正常閱讀順序margin.drawLeadingMargin(canvas, paint, left, dir, ltop,lbaseline, lbottom, buf,start, end, isFirstParaLine, this);left += margin.getLeadingMargin(useFirstLineMargin);}}}}
　　　　　　　//二：Tab或Emojiboolean hasTabOrEmoji = getLineContainsTab(lineNum);// Can't tell if we have tabs for sure, currentlyif (hasTabOrEmoji && !tabStopsIsInitialized) {if (tabStops == null) {tabStops = new TabStops(TAB_INCREMENT, spans);} else {tabStops.reset(TAB_INCREMENT, spans);}tabStopsIsInitialized = true;}// Determine whether the line aligns to normal, opposite, or center.
　　　　　　　//三：對齊方式
Alignment align = paraAlign;if (align == Alignment.ALIGN_LEFT) {align = (dir == DIR_LEFT_TO_RIGHT) ?Alignment.ALIGN_NORMAL : Alignment.ALIGN_OPPOSITE;} else if (align == Alignment.ALIGN_RIGHT) {align = (dir == DIR_LEFT_TO_RIGHT) ?Alignment.ALIGN_OPPOSITE : Alignment.ALIGN_NORMAL;}
　　　　　　//四：獲取x軸，然后寫字。int x;if (align == Alignment.ALIGN_NORMAL) {if (dir == DIR_LEFT_TO_RIGHT) {x = left + getIndentAdjust(lineNum, Alignment.ALIGN_LEFT);} else {x = right + getIndentAdjust(lineNum, Alignment.ALIGN_RIGHT);}} else {int max = (int)getLineExtent(lineNum, tabStops, false);if (align == Alignment.ALIGN_OPPOSITE) {if (dir == DIR_LEFT_TO_RIGHT) {x = right - max + getIndentAdjust(lineNum, Alignment.ALIGN_RIGHT);} else {x = left - max + getIndentAdjust(lineNum, Alignment.ALIGN_LEFT);}} else { // Alignment.ALIGN_CENTERmax = max & ~1;x = ((right + left - max) >> 1) +getIndentAdjust(lineNum, Alignment.ALIGN_CENTER);}}paint.setHyphenEdit(getHyphen(lineNum));Directions directions = getLineDirections(lineNum);
　　　　　　　　//閱讀方式從左向右的，沒有tab和emoji表情，非SpannedText，就是最原始最傳統(tǒng)最簡單畫文字cavans.drawTextif (directions == DIRS_ALL_LEFT_TO_RIGHT && !mSpannedText && !hasTabOrEmoji) {// XXX: assumes there's nothing additional to be done canvas.drawText(buf, start, end, x, lbaseline, paint);} else {//復(fù)雜的交給TextLinetl.set(paint, buf, start, end, dir, directions, hasTabOrEmoji, tabStops);tl.draw(canvas, x, ltop, lbaseline, lbottom);}paint.setHyphenEdit(0);}TextLine.recycle(tl);}

遍歷每一行，主要是由四個流程：畫LeadingMargin——>確認(rèn)tab/emoji(TextLine來畫)——>根據(jù)對齊方式確定從x軸哪個位置開始畫(比如居左x就是0咯)——>

根據(jù)條件判斷是交給cavans直接drawText還是TextLine來畫字。

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三：Canvas&TextLine

1.先看Canvas的drawText方法，就看方法doc。

/*** Draw the specified range of text, specified by start/end, with its* origin at (x,y), in the specified Paint. The origin is interpreted* based on the Align setting in the Paint.** @param text The text to be drawn* @param start The index of the first character in text to draw* @param end (end - 1) is the index of the last character in text* to draw* @param x The x-coordinate of origin for where to draw the text* @param y The y-coordinate of origin for where to draw the text* @param paint The paint used for the text (e.g. color, size, style)*/public void drawText(@NonNull CharSequence text, int start, int end, float x, float y,@NonNull Paint paint)

這個注釋說了三個點，一是畫多少個字(start-end)，二是從哪開始畫，即原點(origin)，這個有xy坐標(biāo)軸來確定，基于對齊方式的設(shè)定，最后就是畫筆paint。

說明一下，start和end是從text里面的所以區(qū)段，而原點的x軸跟對齊方式相關(guān)，y軸一般是baseline。

2.TextLine的draw流程：

void draw(Canvas c, float x, int top, int y, int bottom) {
　　　　　//drawRun畫字if (!mHasTabs) {if (mDirections == Layout.DIRS_ALL_LEFT_TO_RIGHT) {drawRun(c, 0, mLen, false, x, top, y, bottom, false);return;}if (mDirections == Layout.DIRS_ALL_RIGHT_TO_LEFT) {drawRun(c, 0, mLen, true, x, top, y, bottom, false);return;}}
　　　　　//根據(jù)字符轉(zhuǎn)成emoji位圖float h = 0;int[] runs = mDirections.mDirections;RectF emojiRect = null;int lastRunIndex = runs.length - 2;for (int i = 0; i < runs.length; i += 2) {...for (int j = mHasTabs ? runStart : runLimit; j <= runLimit; j++) {int codept = 0;Bitmap bm = null;...bm = Layout.EMOJI_FACTORY.getBitmapFromAndroidPua(codept);...emojiRect.set(x + h, y + bmAscent,x + h + width, y);c.drawBitmap(bm, null, emojiRect, mPaint);...}}}}

轉(zhuǎn)入drawRun方法

/*** Draws a unidirectional (but possibly multi-styled) run of text.*** @param c the canvas to draw on* @param start the line-relative start* @param limit the line-relative limit* @param runIsRtl true if the run is right-to-left* @param x the position of the run that is closest to the leading margin* @param top the top of the line* @param y the baseline* @param bottom the bottom of the line* @param needWidth true if the width value is required.* @return the signed width of the run, based on the paragraph direction.* Only valid if needWidth is true.*/private float drawRun(Canvas c, int start,int limit, boolean runIsRtl, float x, int top, int y, int bottom,boolean needWidth)

而真正的方法還得往下走：

private float handleRun(int start, int measureLimit,int limit, boolean runIsRtl, Canvas c, float x, int top, int y,int bottom, FontMetricsInt fmi, boolean needWidth) {// Case of an empty line, make sure we update fmi according to mPaint
　　　　 //空行，更新FontMetricsIntif (start == measureLimit) {TextPaint wp = mWorkPaint;wp.set(mPaint);if (fmi != null) {expandMetricsFromPaint(fmi, wp);}return 0f;}
　　　　　//無mSpanned，直接handleTextif (mSpanned == null) {TextPaint wp = mWorkPaint;wp.set(mPaint);final int mlimit = measureLimit;return handleText(wp, start, mlimit, start, limit, runIsRtl, c, x, top,y, bottom, fmi, needWidth || mlimit < measureLimit);}
　　　　　//初始化MetricAffectingSpan和CharacterStyleSpanmMetricAffectingSpanSpanSet.init(mSpanned, mStart + start, mStart + limit);mCharacterStyleSpanSet.init(mSpanned, mStart + start, mStart + limit);// Shaping needs to take into account context up to metric boundaries,// but rendering needs to take into account character style boundaries.// So we iterate through metric runs to get metric bounds,// then within each metric run iterate through character style runs// for the run bounds.final float originalX = x;for (int i = start, inext; i < measureLimit; i = inext) {TextPaint wp = mWorkPaint;wp.set(mPaint);inext = mMetricAffectingSpanSpanSet.getNextTransition(mStart + i, mStart + limit) -mStart;int mlimit = Math.min(inext, measureLimit);ReplacementSpan replacement = null;
　　　　　　　　//遍歷MetrixAffectingSpanfor (int j = 0; j < mMetricAffectingSpanSpanSet.numberOfSpans; j++) {// Both intervals [spanStarts..spanEnds] and [mStart + i..mStart + mlimit] are NOT// empty by construction. This special case in getSpans() explains the >= & <= testsif ((mMetricAffectingSpanSpanSet.spanStarts[j] >= mStart + mlimit) ||(mMetricAffectingSpanSpanSet.spanEnds[j] <= mStart + i)) continue;MetricAffectingSpan span = mMetricAffectingSpanSpanSet.spans[j];if (span instanceof ReplacementSpan) {//ReplacementSpan特俗處理replacement = (ReplacementSpan)span;} else {// We might have a replacement that uses the draw// state, otherwise measure state would suffice. span.updateDrawState(wp);//TextPaint拋出去}}
　　　　　　　//處理ReplacementSpanif (replacement != null) {x += handleReplacement(replacement, wp, i, mlimit, runIsRtl, c, x, top, y,bottom, fmi, needWidth || mlimit < measureLimit);continue;}
　　　　　　　//遍歷CharecterStyleSpanfor (int j = i, jnext; j < mlimit; j = jnext) {jnext = mCharacterStyleSpanSet.getNextTransition(mStart + j, mStart + mlimit) -mStart;wp.set(mPaint);for (int k = 0; k < mCharacterStyleSpanSet.numberOfSpans; k++) {// Intentionally using >= and <= as explained aboveif ((mCharacterStyleSpanSet.spanStarts[k] >= mStart + jnext) ||(mCharacterStyleSpanSet.spanEnds[k] <= mStart + j)) continue;CharacterStyle span = mCharacterStyleSpanSet.spans[k];span.updateDrawState(wp);//更新draw狀態(tài)}// Only draw hyphen on last run in lineif (jnext < mLen) {wp.setHyphenEdit(0);}
　　　　　　　　　 //渲染文字...x += handleText(wp, j, jnext, i, inext, runIsRtl, c, x,top, y, bottom, fmi, needWidth || jnext < measureLimit);}}return x - originalX;}

看到這個TextLine主要還是處理SpannedText，遍歷出MetricAffectingSpan和CharactStyleSpan，MetricAffectingSpan下面有個ReplacementSpan，其余

的span都是更新draw狀態(tài)，渲染文字最終還是在handleTextprivate float handleText(TextPaint wp, int start, int end,

int contextStart, int contextEnd, boolean runIsRtl,Canvas c, float x, int top, int y, int bottom,FontMetricsInt fmi, boolean needWidth) {...if (c != null) {if (runIsRtl) {x -= ret;}if (wp.bgColor != 0) {//畫背景色int previousColor = wp.getColor();Paint.Style previousStyle = wp.getStyle();wp.setColor(wp.bgColor);wp.setStyle(Paint.Style.FILL);c.drawRect(x, top, x + ret, bottom, wp);wp.setStyle(previousStyle);wp.setColor(previousColor);}if (wp.underlineColor != 0) {//畫下劃線// kStdUnderline_Offset = 1/9, defined in SkTextFormatParams.h
　　　　　　　　　　//下劃線.top=文字大小的1/9+baseline+baselineShift，也就是說是從baseline空格再往下字符大小的1/9

　　　　　　　　　　float underlineTop = y + wp.baselineShift + (1.0f / 9.0f) * wp.getTextSize();int previousColor = wp.getColor();Paint.Style previousStyle = wp.getStyle();boolean previousAntiAlias = wp.isAntiAlias();wp.setStyle(Paint.Style.FILL);wp.setAntiAlias(true);wp.setColor(wp.underlineColor);
　　　　　　　　　　//線的粗細(xì)，是在TextPaint中定義的c.drawRect(x, underlineTop, x + ret, underlineTop + wp.underlineThickness, wp);wp.setStyle(previousStyle);wp.setColor(previousColor);wp.setAntiAlias(previousAntiAlias);}drawTextRun(c, wp, start, end, contextStart, contextEnd, runIsRtl,x, y + wp.baselineShift);}return runIsRtl ? -ret : ret;}

那drawTextRun中的方法是怎么實現(xiàn)的呢？

private void drawTextRun(Canvas c, TextPaint wp, int start, int end,int contextStart, int contextEnd, boolean runIsRtl, float x, int y) {if (mCharsValid) {int count = end - start;int contextCount = contextEnd - contextStart;c.drawTextRun(mChars, start, count, contextStart, contextCount,x, y, runIsRtl, wp);} else {int delta = mStart;c.drawTextRun(mText, delta + start, delta + end,delta + contextStart, delta + contextEnd, x, y, runIsRtl, wp);}}

可以看到是調(diào)用canvas實現(xiàn)的,canvas都是通過native方法來實現(xiàn)的。

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最后上公眾號，文章同步，手機閱讀。

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