解決textview排列參差不齊問題

public class AboutTextView extends TextView {
    public  static  int m_iTextHeight; //文本的高度
    public  static  int m_iTextWidth;//文本的寬度
   
    private Paint mPaint = null;
    private String string="";
    private float LineSpace = 0;//行間距
   
       
    public AboutTextView(Context context, AttributeSet set)
    {      
        super(context,set);

        Rect rect = new Rect();       
        getWindowVisibleDisplayFrame(rect);
        float rate = (float)rect.right/600;
        float windowWidth = (600-30) * rate;
        TypedArray typedArray = context.obtainStyledAttributes(set, R.styleable.CYTextView);

        int width = typedArray.getInt(R.styleable.CYTextView_textwidth, (int)windowWidth);
        float textsize = typedArray.getDimension(R.styleable.CYTextView_textSize, this.getTextSize());
        int textcolor = typedArray.getColor(R.styleable.CYTextView_textColor, getResources().getColor(R.color.white));
        float linespace = typedArray.getDimension(R.styleable.CYTextView_lineSpacingExtra, 0);
        int typeface = typedArray.getColor(R.styleable.CYTextView_typeface, 0);
       
        typedArray.recycle();
       
        //設定 CY TextView的寬度和行間距

        m_iTextWidth=width;
        LineSpace=linespace;
       
        // 構建paint對象     
        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;//計算字型高度（字型高度＋行間距）

        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)
    {         
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);// 此處應放在前面，不然讀取不到textview設定的高度（我遇到的問題）
        int measuredHeight = measureHeight(heightMeasureSpec);         
        int measuredWidth = measureWidth(widthMeasureSpec);          
        this.setMeasuredDimension(measuredWidth, measuredHeight);
        this.setLayoutParams(new LinearLayout.LayoutParams(measuredWidth,measuredHeight));
    } 
                
    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()
    {
        //設定 CY TextView的初始高度為0
        m_iTextHeight=0;
       
        //大概計算 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+20;
    }
                
    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;         
    }
   
    @Override
    public void setTextSize(float size)
    {
        // TODO Auto-generated method stub
        super.setTextSize(size);
    }

    public void SetText(String text)
    {
        string = text;
    }  
   
}