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這個問題我研究了蠻久了,，最終初見點效果，
給出核心代碼,，給同行們分享,，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.";
private int resourceId=0;
/* 聲明Paint對象 */
private Paint mPaint = null;
/* 聲明TextUtil對象 */
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);
/* 構(gòu)建對象 */
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;
//用反射機制得到 m_iTextHeight 值
/* 實例化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);
/* 設(shè)置背景顏色 */
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)
{
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;
System.out.println("m_iTextHeight----->"+m_iTextHeight);
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.
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 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;
}
}
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