package com.smartdot.addressbook.view;import java.lang.ref.SoftReference;import java.util.ArrayList;import java.util.HashMap;import android.app.Activity;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Rect;import android.graphics.drawable.Drawable;import android.text.SpannableString;import android.text.style.ImageSpan;import android.util.AttributeSet;import android.util.DisplayMetrics;import android.widget.TextView;/** * @功能 图文混排TextView，请使用{@link #setMText(CharSequence)} */public class MTextView extends TextView{private Context context;/** * 用于测量字符宽度 */private Paint paint = new Paint();private int textColor = Color.BLACK;//行距private float lineSpacing;private int lineSpacingDP = 2;//private float lineSpacingMult = 0.5f;/** * 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ImageSpan     */private ArrayList obList = new ArrayList();    /**     * 是否使用默认{@link TextView#onMeasure(int, int)}和{@link TextView#onDraw(Canvas)}     */private boolean useDefault = false;    /**     * 存储当前文本内容，每个item为一行     */ArrayList contentList = new ArrayList();    /**     * 缓存测量过的数据     */private static HashMap> measuredData = new HashMap>();    private static int hashIndex = 0;    private CharSequence text = "";/** * 最小高度 */private int minHeight;/** * 用以获取屏幕高宽 */private DisplayMetrics displayMetrics;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();}@Overridepublic void setMaxWidth(int maxpixels){super.setMaxWidth(maxpixels);maxWidth = maxpixels;}@Overridepublic void setMinHeight(int minHeight){super.setMinHeight(minHeight);this.minHeight = minHeight;}@Overrideprotected 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);}@Overrideprotected void onDraw(Canvas canvas){if (useDefault){super.onDraw(canvas);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 (int i = 0; i < contentList.size(); i++){//绘制一行float realDrawedWidth = 0 + leftPadding;LINE line = contentList.get(i);for (int j = 0; j < line.line.size(); j++){ob = line.line.get(j);width = line.widthList.get(j);if (ob instanceof String){canvas.drawText((String) ob, realDrawedWidth, height + line.height, paint);realDrawedWidth += width;}else if (ob instanceof ImageSpan){ImageSpan is = (ImageSpan) ob;Drawable d = is.getDrawable();int left = (int) (realDrawedWidth);int top = (int) height;int right = (int) (realDrawedWidth + width);int bottom = (int) (height + line.height);d.setBounds(left, top, right, bottom);d.draw(canvas);realDrawedWidth += width;}}height += line.height + lineSpacing;}}@Overridepublic 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();//行高float lineHeight = textSize;//计算出的所需高度float height = lineSpacing;int leftPadding = getCompoundPaddingLeft();int rightPadding = getCompoundPaddingRight();float drawedWidth = 0;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 ImageSpan){Rect r = ((ImageSpan) ob).getDrawable().getBounds();obWidth = r.right - r.left;obHeight = r.bottom - r.top;if (obHeight > lineHeight)lineHeight = obHeight;}//这一行满了，存入contentList,新起一行if (width - drawedWidth < obWidth){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 (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 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) md.contentList.clone();oneLineWidth = md.oneLineWidth;StringBuilder sb = new StringBuilder();for(int i=0;i) 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 cache = new SoftReference(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();//contentList.clear();ArrayList isList = new ArrayList();useDefault = false;if (cs instanceof SpannableString){SpannableString ss = (SpannableString) cs;ImageSpan[] imageSpans = ss.getSpans(0, ss.length(), ImageSpan.class);for (int i = 0; i < imageSpans.length; i++){int s = ss.getSpanStart(imageSpans[i]);int e = ss.getSpanEnd(imageSpans[i]);IS iS = new IS();iS.is = imageSpans[i];iS.start = s;iS.end = e;isList.add(iS);}}String str = cs.toString();for (int i = 0, j = 0; i < cs.length();){if (j < isList.size()){IS 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.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);}}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);}    /**     * @功能: 存储ImageSpan及其开始结束位置     * @author huangwei     * @2014年5月27日     * @下午5:21:37     */class IS{public ImageSpan is;public int start;public int end;}    /**     * @功能: 存储测量好的一行数据     * @author huangwei     * @2014年5月27日     * @下午5:22:12     */class LINE{public ArrayList line = new ArrayList();public ArrayList widthList = new ArrayList();public int height;@Overridepublic String toString(){StringBuilder sb = new StringBuilder("height:"+height+"   ");for(int i=0;i contentList;public int oneLineWidth;public int hashIndex;}}   
   








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