自定义View控件解决android文字排版和换行的问题

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)
{
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;

}
}