Android 解决TextView排版参差不齐的问题

package com.monkey.monkeymushroom.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;/** * 解决文字排版混乱参差不齐的问题 */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); } @Override protected void onLayout(boolean changed, int left, int top, int right, int bottom) {  super.onLayout(changed, left, top, right, bottom); } @Override protected 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();  // layout.getLayout()在4.4.3出现NullPointerException  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());  //解决了最后一行文字间距过大的问题  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);   if (i < layout.getLineCount() - 1) {    if (needScale(line)) {     drawScaledText(canvas, lineStart, line, width);    } else {     canvas.drawText(line, 0, mLineY, paint);    }   } 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';  } }}