文章目录
  1. 1. 解决方法一:
  2. 2. 解决方法二:
  3. 3. 方法一:
  4. 4. 方法二:

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。

Java代码

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。

Java代码

// 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:

Java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=============================

Java代码

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

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

该文件是自定义的属性,放在工程的res/values下

Java代码

<resources>  
    <attr name="textwidth" format="integer"/>  
    <attr name="typeface">  
        <enum name="normal" value="0"/>  
        <enum name="sans" value="1"/>  
        <enum name="serif" value="2"/>  
        <enum name="monospace" value="3"/>  
    </attr>  

    <declare-styleable name="CYTextView">     
        <attr name="textwidth" />         
        <attr name="textSize" format="dimension"/>  
        <attr name="textColor" format="reference|color"/>  
        <attr name="lineSpacingExtra" format="dimension"/>  
        <attr name="typeface" />  
        </declare-styleable>  
</resources>  

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

Java代码

<?xml version="1.0" encoding="utf-8"?>  
<ScrollView  
        xmlns:Android="http://schemas.android.com/apk/res/android"  
        Android:layout_width="320px"  
        Android:layout_height="320px"  
        Android:background="#ffffffff"  
        >  
  <LinearLayout  
        xmlns:Android="http://schemas.android.com/apk/res/android"  
        Android:orientation="vertical"  
        Android:layout_width="fill_parent"  
        Android:layout_height="fill_parent">  
    <com.cy.CYTextView.CYTextView  
        xmlns:cy="http://schemas.Android.com/apk/res/ com.cy.CYTextView "  
        Android:id="@+id/mv"  
        Android:layout_height="wrap_content"  
        Android:layout_width="wrap_content"  
        cy :textwidth="320"         
        cy :textSize="24sp"  
        cy :textColor="#aa000000"  
        cy :lineSpacingExtra="15sp"  
        cy :typeface="serif">  
    </com. cy .CYTextView.CYTextView>     
  </LinearLayout>  
</ScrollView>  

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=============================

Java代码

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);  
    }  

}  


本文出处程序员头条:http://www.androidwonder.com/2016/03/15/android-TextView-line-reason/
转载请在开头注明本文出处。

文章目录
  1. 1. 解决方法一:
  2. 2. 解决方法二:
  3. 3. 方法一:
  4. 4. 方法二: