转自http://www.eoeandroid.com/thread-64055-1-1.html
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这个问题我研究了蛮久了，最终初见点效果，
给出核心代码，给同行们分享，package com.textview.test;
import java.util.Vector;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.FontMetrics;
import android.util.AttributeSet;
import android.view.View;
import android.view.WindowManager;
import android.widget.LinearLayout;
import android.widget.TextView;
public class MyView extends TextView {
private final String namespace="http://www.nearmobile.net";
private int resourceId=0;
/* 声明Paint对象 */
private Paint mPaint = null;
/* 声明TextUtil对象 */
private TextUtil mTextUtil = null;
public??static??int m_iTextHeight;
private WindowManager wm=null;
private String string="";
? ? public MyView(Context context, AttributeSet set) {
? ?? ???super(context,set);
? ?? ???
? ?? ???resourceId=set.getAttributeResourceValue(namespace, "text", 0);
? ?? ???
? ?? ?? ?if(resourceId==0)
? ?? ?? ? string=set.getAttributeValue(null,"text");
? ?? ?? ?else
? ?? ?? ? string=this.getResources().getString(resourceId);
??
? ?? ???wm=(WindowManager)context.getSystemService(Context.WINDOW_SERVICE);
? ?? ???/* 构建对象 */
? ?? ???m_iTextHeight=2000;
??mPaint = new Paint();
??mPaint.setColor(Color.RED);
??mPaint.setStrokeWidth(40);
??mPaint.setTextSize(20);
??
??
??int m_iTextWidth=wm.getDefaultDisplay().getWidth();
??FontMetrics fm = mPaint.getFontMetrics();
??
??int m_iFontHeight = (int) Math.ceil(fm.descent - fm.top) + 4;
??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+2)*m_iFontHeight+2;
??//用反射机制得到? ???m_iTextHeight??值
??
/*??实例化TextUtil?
??mTextUtil = new TextUtil(string,5,25,wm.getDefaultDisplay().getWidth(),this.getHeight(),0x0,0xffffff,255,15);
??
? ?初始化TextUtil?
??mTextUtil.InitText(string,5,25,wm.getDefaultDisplay().getWidth(),wm.getDefaultDisplay().getHeight(),0x0,0xffffff,255,15);*/
? ? }
? ???
? ??
? ??
? ??
? ? @Override
? ? protected void onDraw(Canvas canvas) {
? ?? ??
? ?? ? super.onDraw(canvas);
? ?? ? /* 设置背景颜色 */
? ? canvas.drawColor(Color.BLACK);
? ??
? ? mPaint.setAntiAlias(true);
??
? ???char ch;
??int w = 0;
??int istart = 0;
??int m_iFontHeight;
??int m_iRealLine=0;
??int x=2;
??int y=60;
??Vector m_String=new Vector();
??int m_iTextWidth=wm.getDefaultDisplay().getWidth();
??FontMetrics fm = mPaint.getFontMetrics();
??
??m_iFontHeight = (int) Math.ceil(fm.descent - fm.top) + 4;
??//m_ipageLineNum = m_iTextHeight / m_iFontHeight;
??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)Hira