解决android自带textview右侧文字不能对齐的问题

 package com.sixin.view;

 import android.content.Context;
 import android.graphics.Canvas;
 import android.text.Layout;
 import android.text.StaticLayout;
 import android.text.TextPaint;
 import android.util.AttributeSet;
 import android.widget.TextView;

 /**
  * 能够自动修正的textview，解决android自带textview右侧文字不能对齐的问题
  */
 public class JustifyTextView extends TextView {

     private int mLineY;
     private int mViewWidth;

     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 = (String) getText();
         mLineY = 0;
         mLineY += getTextSize();
         Layout layout = getLayout();
         for (int i = 0; i < layout.getLineCount(); i++) {
             int lineStart = layout.getLineStart(i);
             int lineEnd = layout.getLineEnd(i);
             String line = text.substring(lineStart, lineEnd);

             float width = StaticLayout.getDesiredWidth(text, lineStart, lineEnd, getPaint());
             if (needScale(line)) {
                 drawScaledText(canvas, lineStart, line, width);
             } else {
                 canvas.drawText(line, 0, mLineY, paint);
             }

             mLineY += getLineHeight();
         }
     }

     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);
         }

         float d = (mViewWidth - lineWidth) / line.length() - 1;
         for (int i = 0; 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.length() == 0) {
             return false;
         } else {
             return line.charAt(line.length() - 1) != '\n';
         }
     }

 }