效果圖是下面的，而用傳統的Textview不行
實際上用TextView
直接自定義TextView,上程式碼
package com.madreian.hulk.view;
import java.lang.ref.SoftReference;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
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.Paint.FontMetrics;
import android.graphics.Paint.Style;
import android.graphics.Rect;
import android.text.Spannable;
import android.text.TextPaint;
import android.text.style.BackgroundColorSpan;
import android.text.style.CharacterStyle;
import android.text.style.DynamicDrawableSpan;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
/**
* @author madreain
* @date 2019-08-06.
* module：圖文混排TextView，請使用{@link #setMText(CharSequence)}
* description：
*/
public class MTextView extends android.support.v7.widget.AppCompatTextView {
/**
* 快取測量過的資料
*/
private static HashMap<String, SoftReference<MeasuredData>> measuredData =
new HashMap<String, SoftReference<MeasuredData>>();
private static int hashIndex = 0;
/**
* 儲存當前文字內容，每個item為一行
*/
ArrayList<LINE> contentList = new ArrayList<LINE>();
private Context context;
/**
* 用於測量字元寬度
*/
private TextPaint paint = new TextPaint();
/**
* 用於測量span高度
*/
private Paint.FontMetricsInt mSpanFmInt = new Paint.FontMetricsInt();
/**
* 臨時使用,以免在onDraw中反覆生產新物件
*/
private FontMetrics mFontMetrics = new FontMetrics();
// private float lineSpacingMult = 0.5f;
private int textColor = Color.BLACK;
// 行距
private float lineSpacing;
private int lineSpacingDP = 5;
/**
* 段間距,-1為預設
*/
private int paragraphSpacing = -1;
/**
* 最大寬度
*/
private int maxWidth;
/**
* 只有一行時的寬度
*/
private int oneLineWidth = -1;
/**
* 已繪的行中最寬的一行的寬度
*/
private float lineWidthMax = -1;
/**
* 儲存當前文字內容,每個item為一個字元或者一個SpanObject
*/
private ArrayList<Object> obList = new ArrayList<Object>();
/**
* 是否使用預設{@link #onMeasure(int, int)}和
* {@link #onDraw(android.graphics.Canvas)}
*/
private boolean useDefault = false;
protected CharSequence text = "";
private int minHeight;
/**
* 用以獲取螢幕高寬
*/
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);
init(context);
}
public MTextView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
public MTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init(context);
}
public void init(Context context) {
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);
}
/**
* 根據手機的解析度從 dp 的單位 轉成為 px(畫素)
*/
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);
// 如果實際行寬少於預定的寬度，減少行寬以使其內容橫向居中
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;
// 只有一行時
if (oneLineWidth != -1) {
height = getMeasuredHeight() / 2 - contentList.get(0).height / 2;
}
for (LINE aContentList : contentList) {
// 繪製一行
float realDrawedWidth = leftPadding;
/** 是否換新段落 */
boolean newParagraph = false;
for (int j = 0; j < aContentList.line.size(); j++) {
ob = aContentList.line.get(j);
width = aContentList.widthList.get(j);
paint.getFontMetrics(mFontMetrics);
float x = realDrawedWidth;
float y = height + aContentList.height
- paint.getFontMetrics().descent;
float top = y - aContentList.height;
float bottom = y + mFontMetrics.descent;
if (ob instanceof String) {
canvas.drawText((String) ob, realDrawedWidth, y, paint);
realDrawedWidth += width;
if (((String) ob).endsWith("\n")
&& j == aContentList.line.size() - 1) {
newParagraph = true;
}
} else if (ob instanceof SpanObject) {
Object span = ((SpanObject) ob).span;
if (span instanceof DynamicDrawableSpan) {
int start = ((Spannable) text).getSpanStart(span);
int end = ((Spannable) text).getSpanEnd(span);
((DynamicDrawableSpan) span).draw(canvas, text, start,
end, (int) x, (int) top, (int) y, (int) bottom,
paint);
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 - mFontMetrics.descent);
textBgColorRect.right = textBgColorRect.left + width;
textBgColorRect.bottom = (int) (height
+ aContentList.height + lineSpacing - mFontMetrics.descent);
canvas.drawRect(textBgColorRect, textBgColorPaint);
canvas.drawText(((SpanObject) ob).source.toString(),
realDrawedWidth, height + aContentList.height
- mFontMetrics.descent, paint);
realDrawedWidth += width;
} else// 做字串處理
{
canvas.drawText(((SpanObject) ob).source.toString(),
realDrawedWidth, height + aContentList.height
- mFontMetrics.descent, paint);
realDrawedWidth += width;
}
}
}
// 如果要繪製段間距
if (newParagraph) {
height += aContentList.height + paragraphSpacing;
} else {
height += aContentList.height + lineSpacing;
}
}
}
@Override
public void setTextColor(int color) {
super.setTextColor(color);
textColor = color;
}
/**
* 用於帶ImageSpan的文字內容所佔高度測量
*
* @param width
* 預定的寬度
* @return 所需的高度
*/
private int measureContentHeight(int width) {
int cachedHeight = getCachedData(text.toString(), width);
if (cachedHeight > 0) {
return cachedHeight;
}
// 已繪的寬度
float obWidth = 0;
float obHeight = 0;
float textSize = this.getTextSize();
FontMetrics fontMetrics = paint.getFontMetrics();
// 行高
float lineHeight = fontMetrics.bottom - fontMetrics.top;
// 計算出的所需高度
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;
if ("\n".equals(ob)) { // 遇到"\n"則換行
obWidth = width - drawedWidth;
}
} else if (ob instanceof SpanObject) {
Object span = ((SpanObject) ob).span;
if (span instanceof DynamicDrawableSpan) {
int start = ((Spannable) text).getSpanStart(span);
int end = ((Spannable) text).getSpanEnd(span);
obWidth = ((DynamicDrawableSpan) span).getSize(getPaint(),
text, start, end, mSpanFmInt);
obHeight = Math.abs(mSpanFmInt.top)
+ Math.abs(mSpanFmInt.bottom);
if (obHeight > lineHeight) {
lineHeight = obHeight;
}
} else if (span instanceof BackgroundColorSpan) {
String str = ((SpanObject) ob).source.toString();
obWidth = paint.measureText(str);
obHeight = textSize;
// 如果太長,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--;
}
}// 做字串處理
else {
String str = ((SpanObject) ob).source.toString();
obWidth = paint.measureText(str);
obHeight = textSize;
}
}
// 這一行滿了，存入contentList,新起一行
if (width - drawedWidth < obWidth || splitFlag) {
splitFlag = false;
contentList.add(line);
if (drawedWidth > lineWidthMax) {
lineWidthMax = drawedWidth;
}
drawedWidth = 0;
// 判斷是否有分段
int objNum = line.line.size();
if (paragraphSpacing > 0 && objNum > 0
&& line.line.get(objNum - 1) instanceof String
&& "\n".equals(line.line.get(objNum - 1))) {
height += line.height + paragraphSpacing;
} else {
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;
}
/**
* 獲取快取的測量資料，避免多次重複測量
*
* @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;
}
}
/**
* 快取已測量的資料
*
* @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);
}
/**
* 用本函式代替{@link #setText(CharSequence)}
*
* @param cs
*/
public void setMText(CharSequence cs) {
text = cs;
obList.clear();
ArrayList<SpanObject> isList = new ArrayList<SpanObject>();
useDefault = false;
if (cs instanceof Spannable) {
CharacterStyle[] spans = ((Spannable) cs).getSpans(0, cs.length(),
CharacterStyle.class);
for (int i = 0; i < spans.length; i++) {
int s = ((Spannable) cs).getSpanStart(spans[i]);
int e = ((Spannable) cs).getSpanEnd(spans[i]);
SpanObject iS = new SpanObject();
iS.span = spans[i];
iS.start = s;
iS.end = e;
iS.source = cs.subSequence(s, e);
isList.add(iS);
}
}
// 對span進行排序，以免不同種類的span位置錯亂
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);
// 支援增補字元
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);
}
}
/**
* 設定行距
*
* @param lineSpacingDP
* 行距，單位dp
*/
public void setLineSpacingDP(int lineSpacingDP) {
this.lineSpacingDP = lineSpacingDP;
lineSpacing = dip2px(context, lineSpacingDP);
}
public void setParagraphSpacingDP(int paragraphSpacingDP) {
paragraphSpacing = dip2px(context, paragraphSpacingDP);
}
/**
* 獲取行距
*
* @return 行距，單位dp
*/
public int getLineSpacingDP() {
return lineSpacingDP;
}
/**
* 儲存Span物件及相關資訊
*/
class SpanObject {
public Object span;
public int start;
public int end;
public CharSequence source;
}
/**
* 對SpanObject進行排序
*/
class SpanObjectComparator implements Comparator<SpanObject> {
@Override
public int compare(SpanObject lhs, SpanObject rhs) {
return lhs.start - rhs.start;
}
}
/**
* 儲存測量好的一行資料
*/
class LINE {
public ArrayList<Object> line = new ArrayList<Object>();
public ArrayList<Integer> widthList = new ArrayList<Integer>();
public float 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();
}
}
/**
* 快取的資料
*/
class MeasuredData {
public int measuredHeight;
public float textSize;
public int width;
public float lineWidthMax;
public int oneLineWidth;
public int hashIndex;
ArrayList<LINE> contentList;
}
}
複製程式碼設定的時候使用setMText