JustifyTextView 解决TextView中英文混排排版问题，android文字排版不齐，

最近在做着一个项目，里边会显示很长的一段文字，但是这些文字并不会整齐地排列，遇到文字中带有中英文时，果断给我换行了，好无语..接着就是不断地百度百度，找到了一堆一两年前的东西，不是叫你半角转全角，就是中文符号转英文符号，还有一些自定义TextView的试过了效果也不满意，最后在一个Android开发群中才得知JustifyTextView

GitHub地址：https://github.com/ufo22940268/android-justifiedtextview

借用一下原图：

英文：



中文：



最后是自定义TextView的代码（从GitHup中下载的JustifyTextView有一个小Bug，最后一行显示的文字间距太大，在Issues（https://github.com/ufo22940268/android-justifiedtextview/issues/1）中作者也告知了如何解决，只是Githup代码中未更新，这里的代码已做出了修改）：

[java] view
plaincopy





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;

/**

* @author ccheng

* @Date 3/18/14

*/

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';

}

}

}