下面的代码讲的是用画文字的方法，来让文章换行。其中最主要的是定义文字的坐标，在每一页显示文字多少行。主要的功能就不在XML里写了，而是在main下面写好。剩下的像字体大孝颜色、绘制高和宽，你自己定义就好了。下面我们就来看看用画的方法来让文章自动换行。
package android.study;
import java.util.Vector;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.FontMetrics;
import android.view.KeyEvent;
public class TextUtil {
private float mTextPosx = 0;// x坐标
private float mTextPosy = 0;// y坐标
private float mTextWidth = 0;// 绘制宽度
private float mTextHeight = 0;// 绘制高度
private int mFontHeight = 0;// 绘制字体高度
private int mPageLineNum = 0;// 每一页显示的行数
private int mCanvasBGColor = 0;// 背景颜色
private int mFontColor = 0;// 字体颜色
private int mAlpha = 0;// Alpha值
private int mRealLine = 0;// 字符串真实的行数
private int mCurrentLine = 0;// 当前行
private int mTextSize = 0;// 字体大小
private String mStrText = "";
private Vector mString = null;
private Paint mPaint = null;
public TextUtil(String StrText, float x, float y, float w, float h, int bgcolor, int textcolor, int alpha, int textsize) {
mPaint = new Paint();
mString = new Vector();
this.mStrText = StrText;
this.mTextPosx = x;
this.mTextPosy = y;
this.mTextWidth = w;
this.mTextHeight = h;
this.mCanvasBGColor = bgcolor;
this.mFontColor = textcolor;
this.mAlpha = alpha;
this.mTextSize = textsize;
}
public void InitText() {
mString.clear();// 清空Vector
// 对画笔属性的设置
// mPaint.setARGB(this.mAlpha, Color.red(this.mFontColor), Color
// .green(this.mFontColor), Color.blue(this.mFontColor));
mPaint.setTextSize(this.mTextSize);
mPaint.setColor(Color.BLUE);
mPaint.setAntiAlias(true);
this.GetTextIfon();
}
/**
* 得到字符串信息包括行数，页数等信息
*/
public void GetTextIfon() {
char ch;
int w = 0;
int istart = 0;
FontMetrics fm = mPaint.getFontMetrics();// 得到系统默认字体属性
mFontHeight = (int) (Math.ceil(fm.descent - fm.top) + 2);// 获得字体高度
mPageLineNum = (int) (mTextHeight / mFontHeight);// 获得行数
int count = this.mStrText.length();
for (int i = 0; i < count; i++) {
ch = this.mStrText.charAt(i);
float[] widths = new float[1];
String str = String.valueOf(ch);
mPaint.getTextWidths(str, widths);
if (ch == '\n') {
mRealLine++;// 真实的行数加一
mString.addElement(this.mStrText.substring(istart, i));
istart = i + 1;
w = 0;
}
else {
w += (int) Math.ceil(widths[0]);
if (w > this.mTextWidth) {
mRealLine++;// 真实的行数加一
mString.addElement(this.mStrText.substring(istart, i));
istart = i;
i--;
w = 0;
}
else {
if (i == count - 1) {
mRealLine++;// 真实的行数加一
mString.addElement(this.mStrText.substring(istart, count));
}
}
}
}
}
/**
* 绘制字符串
*
* @param canvas
*/
public void DrawText(Canvas canvas) {
for (int i = this.mCurrentLine, j = 0; i < this.mRealLine; i++, j++) {
if (j > this.mPageLineNum) {
break;
}
canvas.drawText((String) (mString.elementAt(i)), this.mTextPosx, this.mTextPosy + this.mFontHeight * j, mPaint);
}
}
/**
* 翻页等按键处理
*
* @param keyCode
* @param event
* @return
*/
public boolean KeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_DPAD_UP) {
if (this.mCurrentLine > 0) {
this.mCurrentLine--;
}
}
else if (keyCode == KeyEvent.KEYCODE_DPAD_DOWN) {
if ((this.mCurrentLine + this.mPageLineNum) < (this.mRealLine - 1)) {
this.mCurrentLine++;
}
}
return false;
}
}
