先看下效果图：
上面是MTextView，下面是默认的TextView。
一、原因
用最简单的全英文句子为例，如果有一个很长的单词，这一行剩余的空间显示不下了，那么规则就是不打断单词，而是把整个单词丢到下一行开始显示。这样 本来没有错。一是咱们中国人都是方块字，怎么都放得下，不存在英文的这个问题。所以不习惯那个排版。二是如果TextView里面有图片，如图，
二、解决方法
最简单的就是表情之间加空格，如果不想这么做，就只有自己来画啦。
先给初学的朋友解释一下View绘制的流程，首先是onMeasure(int widthMeasureSpec, int heightMeasureSpec),onMeasure执行的时候，就是父View在问你，小朋友，你要占多大的地儿呀？当然，问你的时候，会给你个 限制条件，就是那两参数，以widthMeasureSpec为例，这参数不能直接用，得先拆开，用int widthMode = MeasureSpec.getMode(widthMeasureSpec) 和 int widthSize = MeasureSpec.getSize(widthMeasureSpec);widthMode就三种情况：
MeasureSpec.EXACTLY：你就widthSize那么宽就行了。
MeasureSpec.AT_MOST：你最多只能widthSize那么宽。
MeasureSpec.UNSPECIFIED：未指定，你爱多宽多宽。
当然，其实这只父View给你的建议，遵不遵守你自己看着办，但是自己乱来导致显示不全就不是父View的错了。
最终你听取了建议，思量了一番，觉得自己应该有width那么宽，height那么高，最后就得用setMeasuredDimension(width, height)这个函数真正确定自己的高宽。然后onMeasure()的工作就完了。
然后就是onDraw(Canvas canvas)，这个就简单了，canvas就是父View给的一块画布，爱在上面画啥都行，比如写个字drawText(String text,float x, float y, Paint paint)，
text是要写的字，paint是写字的笔，值得注意的是x,y坐标是相对于你自己这一小块画布的左上角的。最左上就是0,0右下是width,height
上代码
/** * @author huangwei * @version SocialClient 1.2.0 * @功能 图文混排TextView，请使用{@link #setMText(CharSequence)} * @2014年5月27日 * @下午5:29:27 */ public class MTextView extends TextView { /** * 缓存测量过的数据 */ private static HashMap<String, SoftReference<MeasuredData>> measuredData = new HashMap<String, SoftReference<MeasuredData>>(); private static int hashIndex = 0; /** * 存储当前文本内容，每个item为一行 */ ArrayList<LINE> contentList = new ArrayList<LINE>(); private Context context; /** * 用于测量字符宽度 */ private TextPaint paint = new TextPaint(); // private float lineSpacingMult = 0.5f; private int textColor = Color.BLACK; //行距 private float lineSpacing; private int lineSpacingDP = 5; /** * 最大宽度 */ private int maxWidth; /** * 只有一行时的宽度 */ private int oneLineWidth = -1; /** * 已绘的行中最宽的一行的宽度 */ private float lineWidthMax = -1; /** * 存储当前文本内容,每个item为一个字符或者一个SpanObject */ private ArrayList<Object> obList = new ArrayList<Object>(); /** * 是否使用默认{@link #onMeasure(int, int)}和{@link #onDraw(Canvas)} */ private boolean useDefault = false; private CharSequence text = ""; private int minHeight; /** * 用以获取屏幕高宽 */ private DisplayMetrics displayMetrics; /** * {@link android.text.style.BackgroundColorSpan}用 */ private Paint textBgColorPaint = new Paint(); /** * {@link android.text.style.BackgroundColorSpan}用 */ private Rect textBgColorRect = new Rect(); public MTextView(Context context) { super(context); this.context = context; paint.setAntiAlias(true); lineSpacing = dip2px(context, lineSpacingDP); minHeight = dip2px(context, 30); displayMetrics = new DisplayMetrics(); } public MTextView(Context context,AttributeSet attrs) { super(context,attrs); this.context = context; paint.setAntiAlias(true); lineSpacing = dip2px(context, lineSpacingDP); minHeight = dip2px(context, 30); displayMetrics = new DisplayMetrics(); } public static int px2sp(Context context, float pxValue) { final float fontScale = context.getResources().getDisplayMetrics().scaledDensity; return (int) (pxValue / fontScale + 0.5f); } /** * 根据手机的分辨率从 dp 的单位 转成为 px(像素) */ public static int dip2px(Context context, float dpValue) { final float scale = context.getResources().getDisplayMetrics().density; return (int) (dpValue * scale + 0.5f); } @Override public void setMaxWidth(int maxpixels) { super.setMaxWidth(maxpixels); maxWidth = maxpixels; } @Override public void setMinHeight(int minHeight) { super.setMinHeight(minHeight); this.minHeight = minHeight; } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { if (useDefault) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); return; } int width = 0, height = 0; int widthMode = MeasureSpec.getMode(widthMeasureSpec); int heightMode = MeasureSpec.getMode(heightMeasureSpec); int widthSize = MeasureSpec.getSize(widthMeasureSpec); int heightSize = MeasureSpec.getSize(heightMeasureSpec); switch (widthMode) { case MeasureSpec.EXACTLY: width = widthSize; break; case MeasureSpec.AT_MOST: width = widthSize; break; case MeasureSpec.UNSPECIFIED: ((Activity) context).getWindowManager().getDefaultDisplay().getMetrics(displayMetrics); width = displayMetrics.widthPixels; break; default: break; } if (maxWidth > 0) width = Math.min(width, maxWidth); paint.setTextSize(this.getTextSize()); paint.setColor(textColor); int realHeight = measureContentHeight((int) width); //如果实际行宽少于预定的宽度，减少行宽以使其内容横向居中 int leftPadding = getCompoundPaddingLeft(); int rightPadding = getCompoundPaddingRight(); width = Math.min(width, (int) lineWidthMax + leftPadding + rightPadding); if (oneLineWidth > -1) { width = oneLineWidth; } switch (heightMode) { case MeasureSpec.EXACTLY: height = heightSize; break; case MeasureSpec.AT_MOST: height = realHeight; break; case MeasureSpec.UNSPECIFIED: height = realHeight; break; default: break; } height += getCompoundPaddingTop() + getCompoundPaddingBottom(); height = Math.max(height, minHeight); setMeasuredDimension(width, height); } @Override protected void onDraw(Canvas canvas) { if (useDefault) { super.onDraw(canvas); return; } if (contentList.isEmpty()) return; int width; Object ob; int leftPadding = getCompoundPaddingLeft(); int topPadding = getCompoundPaddingTop(); float height = 0 + topPadding + lineSpacing; //只有一行时 if (oneLineWidth != -1) { height = getMeasuredHeight() / 2 - contentList.get(0).height / 2; } for (LINE aContentList : contentList) { //绘制一行 float realDrawedWidth = leftPadding; for (int j = 0; j < aContentList.line.size(); j++) { ob = aContentList.line.get(j); width = aContentList.widthList.get(j); if (ob instanceof String) { canvas.drawText((String) ob, realDrawedWidth, height + aContentList.height - paint.getFontMetrics().descent, paint); realDrawedWidth += width; } else if (ob instanceof SpanObject) { Object span = ((SpanObject) ob).span; if(span instanceof ImageSpan) { ImageSpan is = (ImageSpan) span; Drawable d = is.getDrawable(); int left = (int) (realDrawedWidth); int top = (int) height; int right = (int) (realDrawedWidth + width); int bottom = (int) (height + aContentList.height); d.setBounds(left, top, right, bottom); d.draw(canvas); realDrawedWidth += width; } else if(span instanceof BackgroundColorSpan) { textBgColorPaint.setColor(((BackgroundColorSpan) span).getBackgroundColor()); textBgColorPaint.setStyle(Style.FILL); textBgColorRect.left = (int) realDrawedWidth; int textHeight = (int) getTextSize(); textBgColorRect.top = (int) (height + aContentList.height - textHeight - paint.getFontMetrics().descent); textBgColorRect.right = textBgColorRect.left+width; textBgColorRect.bottom = (int) (height + aContentList.height + lineSpacing - paint.getFontMetrics().descent); canvas.drawRect(textBgColorRect, textBgColorPaint); canvas.drawText(((SpanObject) ob).source.toString(), realDrawedWidth, height + aContentList.height - paint.getFontMetrics().descent, paint); realDrawedWidth += width; } else//做字符串处理 { canvas.drawText(((SpanObject) ob).source.toString(), realDrawedWidth, height + aContentList.height - paint.getFontMetrics().descent, paint); realDrawedWidth += width; } } } height += aContentList.height + lineSpacing; } } @Override public void setTextColor(int color) { super.setTextColor(color); textColor = color; } /** * 用于带ImageSpan的文本内容所占高度测量 * @param width 预定的宽度 * @return 所需的高度 */ private int measureContentHeight(int width) { int cachedHeight = getCachedData(text.toString(), width); if (cachedHeight > 0) { return cachedHeight; } // 已绘的宽度 float obWidth = 0; float obHeight = 0; float textSize = this.getTextSize(); FontMetrics fontMetrics = paint.getFontMetrics(); //行高 float lineHeight = fontMetrics.bottom - fontMetrics.top; //计算出的所需高度 float height = lineSpacing; int leftPadding = getCompoundPaddingLeft(); int rightPadding = getCompoundPaddingRight(); float drawedWidth = 0; boolean splitFlag = false;//BackgroundColorSpan拆分用 width = width - leftPadding - rightPadding; oneLineWidth = -1; contentList.clear(); StringBuilder sb; LINE line = new LINE(); for (int i = 0; i < obList.size(); i++) { Object ob = obList.get(i); if (ob instanceof String) { obWidth = paint.measureText((String) ob); obHeight = textSize; } else if (ob instanceof SpanObject) { Object span = ((SpanObject) ob).span; if(span instanceof ImageSpan) { Rect r = ((ImageSpan)span).getDrawable().getBounds(); obWidth = r.right - r.left; obHeight = r.bottom - r.top; if (obHeight > lineHeight) lineHeight = obHeight; } else if(span instanceof BackgroundColorSpan) { String str = ((SpanObject) ob).source.toString(); obWidth = paint.measureText(str); obHeight = textSize; //如果太长,拆分 int k= str.length()-1; while(width - drawedWidth < obWidth) { obWidth = paint.measureText(str.substring(0,k--)); } if(k < str.length()-1) { splitFlag = true; SpanObject so1 = new SpanObject(); so1.start = ((SpanObject) ob).start; so1.end = so1.start + k; so1.source = str.substring(0,k+1); so1.span = ((SpanObject) ob).span; SpanObject so2 = new SpanObject(); so2.start = so1.end; so2.end = ((SpanObject) ob).end; so2.source = str.substring(k+1,str.length()); so2.span = ((SpanObject) ob).span; ob = so1; obList.set(i,so2); i--; } }//做字符串处理 else { String str = ((SpanObject) ob).source.toString(); obWidth = paint.measureText(str); obHeight = textSize; } } //这一行满了，存入contentList,新起一行 if (width - drawedWidth < obWidth || splitFlag) { splitFlag = false; contentList.add(line); if (drawedWidth > lineWidthMax) { lineWidthMax = drawedWidth; } drawedWidth = 0; height += line.height + lineSpacing; lineHeight = obHeight; line = new LINE(); } drawedWidth += obWidth; if (ob instanceof String && line.line.size() > 0 && (line.line.get(line.line.size() - 1) instanceof String)) { int size = line.line.size(); sb = new StringBuilder(); sb.append(line.line.get(size - 1)); sb.append(ob); ob = sb.toString(); obWidth = obWidth + line.widthList.get(size - 1); line.line.set(size - 1, ob); line.widthList.set(size - 1, (int) obWidth); line.height = (int) lineHeight; } else { line.line.add(ob); line.widthList.add((int) obWidth); line.height = (int) lineHeight; } } if (drawedWidth > lineWidthMax) { lineWidthMax = drawedWidth; } if (line != null && line.line.size() > 0) { contentList.add(line); height += lineHeight + lineSpacing; } if (contentList.size() <= 1) { oneLineWidth = (int) drawedWidth + leftPadding + rightPadding; height = lineSpacing + lineHeight + lineSpacing; } cacheData(width, (int) height); return (int) height; } /** * 获取缓存的测量数据，避免多次重复测量 * @param text * @param width * @return height */ @SuppressWarnings("unchecked") private int getCachedData(String text, int width) { SoftReference<MeasuredData> cache = measuredData.get(text); if (cache == null) return -1; MeasuredData md = cache.get(); if (md != null && md.textSize == this.getTextSize() && width == md.width) { lineWidthMax = md.lineWidthMax; contentList = (ArrayList<LINE>) md.contentList.clone(); oneLineWidth = md.oneLineWidth; StringBuilder sb = new StringBuilder(); for (int i = 0; i < contentList.size(); i++) { LINE line = contentList.get(i); sb.append(line.toString()); } return md.measuredHeight; } else return -1; } /** * 缓存已测量的数据 * @param width * @param height */ @SuppressWarnings("unchecked") private void cacheData(int width, int height) { MeasuredData md = new MeasuredData(); md.contentList = (ArrayList<LINE>) contentList.clone(); md.textSize = this.getTextSize(); md.lineWidthMax = lineWidthMax; md.oneLineWidth = oneLineWidth; md.measuredHeight = height; md.width = width; md.hashIndex = ++hashIndex; StringBuilder sb = new StringBuilder(); for (int i = 0; i < contentList.size(); i++) { LINE line = contentList.get(i); sb.append(line.toString()); } SoftReference<MeasuredData> cache = new SoftReference<MeasuredData>(md); measuredData.put(text.toString(), cache); } /** * 用本函数代替{@link #setText(CharSequence)} * @param cs */ public void setMText(CharSequence cs) { text = cs; obList.clear(); ArrayList<SpanObject> isList = new ArrayList<MTextView.SpanObject>(); useDefault = false; if (cs instanceof SpannableString) { SpannableString ss = (SpannableString) cs; CharacterStyle[] spans = ss.getSpans(0, ss.length(), CharacterStyle.class); for (int i = 0; i < spans.length; i++) { int s = ss.getSpanStart(spans[i]); int e = ss.getSpanEnd(spans[i]); SpanObject iS = new SpanObject(); iS.span = spans[i]; iS.start = s; iS.end = e; iS.source = ss.subSequence(s, e); isList.add(iS); } } //对span进行排序，以免不同种类的span位置错乱 SpanObject[] spanArray = new SpanObject[isList.size()]; isList.toArray(spanArray); Arrays.sort(spanArray,0,spanArray.length,new SpanObjectComparator()); isList.clear(); for(int i=0;i<spanArray.length;i++) { isList.add(spanArray[i]); } String str = cs.toString(); for (int i = 0, j = 0; i < cs.length(); ) { if (j < isList.size()) { SpanObject is = isList.get(j); if (i < is.start) { Integer cp = str.codePointAt(i); //支持增补字符 if (Character.isSupplementaryCodePoint(cp)) { i += 2; } else { i++; } obList.add(new String(Character.toChars(cp))); } else if (i >= is.start) { obList.add(is); j++; i = is.end; } } else { Integer cp = str.codePointAt(i); if (Character.isSupplementaryCodePoint(cp)) { i += 2; } else { i++; } obList.add(new String(Character.toChars(cp))); } } requestLayout(); } public void setUseDefault(boolean useDefault) { this.useDefault = useDefault; if (useDefault) { this.setText(text); this.setTextColor(textColor); } } /** * 设置行距 * @param lineSpacingDP 行距，单位dp */ public void setLineSpacingDP(int lineSpacingDP) { this.lineSpacingDP = lineSpacingDP; lineSpacing = dip2px(context, lineSpacingDP); } /** * 获取行距 * @return 行距，单位dp */ public int getLineSpacingDP() { return lineSpacingDP; } /** * @author huangwei * @version SocialClient 1.2.0 * @功能: 存储Span对象及相关信息 * @2014年5月27日 * @下午5:21:37 */ class SpanObject { public Object span; public int start; public int end; public CharSequence source; } /** * @功能: 对SpanObject进行排序 * @author huangwei * @2014年6月4日 * @下午5:21:30 * @version SocialClient 1.2.0 */ class SpanObjectComparator implements Comparator<SpanObject> { @Override public int compare(SpanObject lhs, SpanObject rhs) { return lhs.start - rhs.start; } } /** * @author huangwei * @version SocialClient 1.2.0 * @功能: 存储测量好的一行数据 * @2014年5月27日 * @下午5:22:12 */ class LINE { public ArrayList<Object> line = new ArrayList<Object>(); public ArrayList<Integer> widthList = new ArrayList<Integer>(); public int height; @Override public String toString() { StringBuilder sb = new StringBuilder("height:" + height + " "); for (int i = 0; i < line.size(); i++) { sb.append(line.get(i) + ":" + widthList.get(i)); } return sb.toString(); } } /** * @author huangwei * @version SocialClient 1.2.0 * @功能: 缓存的数据 * @2014年5月27日 * @下午5:22:25 */ class MeasuredData { public int measuredHeight; public float textSize; public int width; public float lineWidthMax; public int oneLineWidth; public int hashIndex; ArrayList<LINE> contentList; }
为方便在ListView中使用（ListView反复上下滑动会多次重新onMeasure）,加了缓存，相同的情况下可以不用重复在测量一次。
对于SpannableString，只支持了ImageSpan，有其它需要者可自行扩展
Demo：http://download.csdn.net/detail/yellowcath/7421147 或：https://github.com/yellowcath/MTextView.git (2014/6/4 更新 添加对BackGroundColorSpan的支持，修复一个会导致最后一行最后一个图形显示不全的bug)
代码：这里