通过自定义TextView，拉伸每行解决自动换行文字排版参差不齐问题

通过自定义TextView，拉伸每行解决自动换行文字排版参差不齐问题

package com.island.islandsystem.custom_view;import android.content.Context;import android.graphics.Canvas;import android.graphics.Paint;import android.text.Layout;import android.text.StaticLayout;import android.text.TextPaint;import android.util.AttributeSet;import android.widget.TextView;public class JustifyTextView extends TextView {private int mLineY;private int mViewWidth;public static final String TWO_CHINESE_BLANK = "  ";public JustifyTextView(Context context, AttributeSet attrs) {super(context, attrs);}@Overrideprotected void onLayout(boolean changed, int left, int top, int right,int bottom) {super.onLayout(changed, left, top, right, bottom);}@Overrideprotected void onDraw(Canvas canvas) {TextPaint paint = getPaint();paint.setColor(getCurrentTextColor());paint.drawableState = getDrawableState();mViewWidth = getMeasuredWidth();String text = getText().toString();mLineY = 0;mLineY += getTextSize();Layout layout = getLayout();if (layout == null) {return;}Paint.FontMetrics fm = paint.getFontMetrics();int textHeight = (int) (Math.ceil(fm.descent - fm.ascent));textHeight = (int) (textHeight * layout.getSpacingMultiplier() + layout.getSpacingAdd());for (int i = 0; i < layout.getLineCount(); i++) {int lineStart = layout.getLineStart(i);int lineEnd = layout.getLineEnd(i);float width = StaticLayout.getDesiredWidth(text, lineStart,lineEnd, getPaint());String line = text.substring(lineStart, lineEnd);

<span></span>//判断是否拉伸if (needScale(line)) {if(i==layout.getLineCount()-1){//最后一行不拉伸canvas.drawText(line, 0, mLineY, paint);}else{drawScaledText(canvas, lineStart, line, width);}} else {canvas.drawText(line, 0, mLineY, paint);}mLineY += textHeight;}}private void drawScaledText(Canvas canvas, int lineStart, String line,float lineWidth) {float x = 0;if (isFirstLineOfParagraph(lineStart, line)) {String blanks = "  ";canvas.drawText(blanks, x, mLineY, getPaint());float bw = StaticLayout.getDesiredWidth(blanks, getPaint());x += bw;line = line.substring(3);}int gapCount = line.length() - 1;int i = 0;if (line.length() > 2 && line.charAt(0) == 12288&& line.charAt(1) == 12288) {String substring = line.substring(0, 2);float cw = StaticLayout.getDesiredWidth(substring, getPaint());canvas.drawText(substring, x, mLineY, getPaint());x += cw;i += 2;}float d = (mViewWidth - lineWidth) / gapCount;for (; i < line.length(); i++) {String c = String.valueOf(line.charAt(i));float cw = StaticLayout.getDesiredWidth(c, getPaint());canvas.drawText(c, x, mLineY, getPaint());x += cw + d;}}private boolean isFirstLineOfParagraph(int lineStart, String line) {return line.length() > 3 && line.charAt(0) == ' '&& line.charAt(1) == ' ';}private boolean needScale(String line) {if (line == null || line.length() == 0) {return false;} else {return line.charAt(line.length() - 1) != '\n';}}}