Android 解决TextView排版参差不齐的问题

 Android 解决TextView排版参差不齐的问题

在app中，展示数据时，里面有汉字、数字、特殊字符时，由于全角、半角问题导致TextView参差不齐。在网上找了许多，半角转全角并没什么用，还有其他自定义TextView都有问题。最后终于找到一个，就像Word一样，可以使文字左右两端对齐：

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';
 }
}
}

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