Android(安卓)TextView自动换行文字排版参差不齐的原因

今天项目没什么进展，公司后台出问题了。看了下刚刚学习Android时的笔记，发现TextView会自动换行，而且排版文字参差不齐。查了下资料，总结原因如下：

1、半角字符与全角字符混乱所致：这种情况一般就是汉字与数字、英文字母混用

解决方法一：

将textview中的字符全角化。即将所有的数字、字母及标点全部转为全角字符，使它们与汉字同占两个字节，这样就可以避免由于占位导致的排版混乱问题了。半角转为全角的代码如下，只需调用即可。

public static String ToDBC(String input) {   char[] c = input.toCharArray();   for (int i = 0; i< c.length; i++) {       if (c[i] == 12288) {         c[i] = (char) 32;         continue;       }if (c[i]> 65280&& c[i]< 65375)          c[i] = (char) (c[i] - 65248);       }   return new String(c);}

解决方法二：

去除特殊字符或将所有中文标号替换为英文标号。利用正则表达式将所有特殊字符过滤，或利用replaceAll（）将中文标号替换为英文标号。则转化之后，则可解决排版混乱问题。

// 替换、过滤特殊字符public static String StringFilter(String str) throws PatternSyntaxException{    str=str.replaceAll("【","[").replaceAll("】","]").replaceAll("！","!");//替换中文标号    String regEx="[『』]"; // 清除掉特殊字符    Pattern p = Pattern.compile(regEx);    Matcher m = p.matcher(str); return m.replaceAll("").trim();}

2、TextView在显示中文的时候标点符号不能显示在一行的行首和行尾，如果一个标点符号刚好在一行的行尾，该标点符号就会连同前一个字符跳到下一行显示。

解决方法：在标点符号后加一个空格。

3、一个英文单词不能被显示在两行中（ TextView在显示英文时，标点符号是可以放在行尾的，但英文单词也不能分开）。

4、如果要两行对其的显示效果：有两种方法

方法一：

修改Android源代码；将frameworks/base/core/java/android/text下的StaticLayout.java文件中的如下代码：

  if (c == ' ' || c == '/t' ||                            ((c == '.'  || c == ',' || c == ':' || c == ';') &&                             (j - 1 < here || !Character.isDigit(chs[j - 1 - start])) &&                             (j + 1 >= next || !Character.isDigit(chs[j + 1 - start]))) ||                            ((c == '/' || c == '-') &&                             (j + 1 >= next || !Character.isDigit(chs[j + 1 - start]))) ||                            (c >= FIRST_CJK && isIdeographic(c, true) &&                             j + 1 < next && isIdeographic(chs[j + 1 - start], false))) {                            okwidth = w;                            ok = j + 1;                            if (fittop < oktop)                                oktop = fittop;                            if (fitascent < okascent)                                okascent = fitascent;                            if (fitdescent > okdescent)                                okdescent = fitdescent;                            if (fitbottom > okbottom)                                okbottom = fitbottom;                        }

去掉就可以了。去掉后标点符号可以显示在行首和行尾，英文单词也可以被分开在两行中显示。

方法二：

自定义View显示文本

网上就有达人采用自定义View来解决这个问题，我做了实验并总结了一下：

自定义View的步骤：

1）继承View类或其子类，例子继承了TextView类；

2）写构造函数，通过XML获取属性（这一步中可以自定义属性，见例程）；

3）重写父类的某些函数，一般都是以on开头的函数，例子中重写了onDraw()和onMeasure()函数；

=========================CYTextView.java=============================

public class CYTextView extends TextView {    public  static  int m_iTextHeight; //文本的高度    public  static  int m_iTextWidth;//文本的宽度       private Paint mPaint = null;    private String string="";    private float LineSpace = 0;//行间距           public CYTextView(Context context, AttributeSet set)    {              super(context,set);         TypedArray typedArray = context.obtainStyledAttributes(set, R.styleable.CYTextView);        int width = typedArray.getInt(R.styleable. CY TextView_textwidth, 320);        float textsize = typedArray.getDimension(R.styleable. CY TextView_textSize, 24);        int textcolor = typedArray.getColor(R.styleable. CY TextView_textColor, -1442840576);        float linespace = typedArray.getDimension(R.styleable. CY TextView_lineSpacingExtra, 15);        int typeface = typedArray.getColor(R.styleable. CY TextView_typeface, 0);               typedArray.recycle();               //设置 CY TextView的宽度和行间距www.linuxidc.com        m_iTextWidth=width;        LineSpace=linespace;               // 构建paint对象             mPaint = new Paint();        mPaint.setAntiAlias(true);        mPaint.setColor(textcolor);        mPaint.setTextSize(textsize);        switch(typeface){        case 0:            mPaint.setTypeface(Typeface.DEFAULT);            break;        case 1:            mPaint.setTypeface(Typeface.SANS_SERIF);            break;        case 2:            mPaint.setTypeface(Typeface.SERIF);            break;        case 3:            mPaint.setTypeface(Typeface.MONOSPACE);            break;        default:            mPaint.setTypeface(Typeface.DEFAULT);               break;        }           }     @Override    protected void onDraw(Canvas canvas)    {        super.onDraw(canvas);                     char ch;        int w = 0;        int istart = 0;        int m_iFontHeight;        int m_iRealLine=0;        int x=2;        int y=30;               Vector    m_String=new Vector();               FontMetrics fm = mPaint.getFontMetrics();               m_iFontHeight = (int) Math.ceil(fm.descent - fm.top) + (int)LineSpace;//计算字体高度（字体高度＋行间距）        for (int i = 0; i < string.length(); i++)        {            ch = string.charAt(i);            float[] widths = new float[1];            String srt = String.valueOf(ch);            mPaint.getTextWidths(srt, widths);            if (ch == '/n'){                m_iRealLine++;                m_String.addElement(string.substring(istart, i));                istart = i + 1;                w = 0;            }else{                w += (int) (Math.ceil(widths[0]));                if (w > m_iTextWidth){                    m_iRealLine++;                    m_String.addElement(string.substring(istart, i));                    istart = i;                    i--;                    w = 0;                }else{                    if (i == (string.length() - 1)){                        m_iRealLine++;                        m_String.addElement(string.substring(istart, string.length()));                    }                }            }        }        m_iTextHeight=m_iRealLine*m_iFontHeight+2;        canvas.setViewport(m_iTextWidth, m_iTextWidth);        for (int i = 0, j = 0; i < m_iRealLine; i++, j++)        {            canvas.drawText((String)(m_String.elementAt(i)), x,  y+m_iFontHeight * j, mPaint);        }    }          protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)    {                 int measuredHeight = measureHeight(heightMeasureSpec);                 int measuredWidth = measureWidth(widthMeasureSpec);                  this.setMeasuredDimension(measuredWidth, measuredHeight);        this.setLayoutParams(new LinearLayout.LayoutParams(measuredWidth,measuredHeight));        super.onMeasure(widthMeasureSpec, heightMeasureSpec);    }                     private int measureHeight(int measureSpec)    {         int specMode = MeasureSpec.getMode(measureSpec);                 int specSize = MeasureSpec.getSize(measureSpec);                          // Default size if no limits are specified.         initHeight();        int result = m_iTextHeight;                 if (specMode == MeasureSpec.AT_MOST){                    // Calculate the ideal size of your                     // control within this maximum size.                     // If your control fills the available                      // space return the outer bound.                     result = specSize;                  }else if (specMode == MeasureSpec.EXACTLY){                      // If your control can fit within these bounds return that value.                       result = specSize;                  }                  return result;               }        private void initHeight()    {        //设置 CY TextView的初始高度为0        m_iTextHeight=0;               //大概计算 CY TextView所需高度        FontMetrics fm = mPaint.getFontMetrics();               int m_iFontHeight = (int) Math.ceil(fm.descent - fm.top) + (int)LineSpace;        int line=0;        int istart=0;               int w=0;        for (int i = 0; i < string.length(); i++)        {            char ch = string.charAt(i);            float[] widths = new float[1];            String srt = String.valueOf(ch);            mPaint.getTextWidths(srt, widths);            if (ch == '/n'){                line++;                istart = i + 1;                w = 0;            }else{                w += (int) (Math.ceil(widths[0]));                if (w > m_iTextWidth){                    line++;                    istart = i;                    i--;                    w = 0;                }else{                    if (i == (string.length() - 1)){                        line++;                    }                }            }        }        m_iTextHeight=(line)*m_iFontHeight+2;    }                    private int measureWidth(int measureSpec)    {         int specMode = MeasureSpec.getMode(measureSpec);                  int specSize = MeasureSpec.getSize(measureSpec);                             // Default size if no limits are specified.                 int result = 500;                 if (specMode == MeasureSpec.AT_MOST){                     // Calculate the ideal size of your control                      // within this maximum size.                    // If your control fills the available space                    // return the outer bound.                    result = specSize;                 }else if (specMode == MeasureSpec.EXACTLY){                      // If your control can fit within these bounds return that value.                      result = specSize;                   }                  return result;             }public void SetText(String text)(//注：此函数目前只有在UI线程中调用才可以把文本画出来，在其它线程中

//无法画文本，找了好久找不到原因，求高手解答) { string = text; // requestLayout(); // invalidate(); } }

=======================attrs.xml===============================

该文件是自定义的属性，放在工程的res/values下

=======================main.xml==========================

<?xml version="1.0" encoding="utf-8"?>

蓝色代码即为自定义View，其中以cy命名空间开头的属性是自定义属性；

=======================Main.java=============================

public class Main extends Activity {    CYTextView mCYTextView;    String text = "Android提供了精巧和有力的组件化模型构建用户的UI部分。主要是基于布局类：View和        ViewGroup。在此基础上，android平台提供了大量的预制的View和xxxViewGroup子类，即布局（layout）和窗口小部件（widget）。可以用它们构建自己的UI。";          @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        this.setContentView(R.layout.main);               mCYTextView = (CYTextView)findViewById(R.id.mv);        mCYTextView.SetText(text);    }}

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