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）：

 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';
         }
     }

 }