转自http://www.eoeandroid.com/thread-64055-1-1.html
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