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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