JavaMe连载(4)-绘制可自动换行文本
【问题描述】
JavaMe Graphics类中的drawString不支持文本换行,这样绘制比较长的字符串时,文本被绘制在同一行,超过屏幕部分的字符串被截断了。如何使绘制的文本能自动换行呢?
【分析】
drawString无法实现自动换行,但可以实现文本绘制的定位。因此可考虑,将文本拆分为多个子串,再对子串进行绘制。拆分的策略如下:
1 遇到换行符,进行拆分;
2 当字符串长度大于设定的长度(一般为屏幕的宽度),进行拆分。
【步骤】
1 定义一个String和String []对象;
[html] private String info;
private String info_wrap[];
private String info;
private String info_wrap[];
2 实现字符串自动换行拆分函数
StringDealMethod.java
[html] package com.token.util;
import java.util.Vector;
import javax.microedition.lcdui.Font;
public class StringDealMethod {
public StringDealMethod()
{
}
// 字符串切割,实现字符串自动换行
public static String[] format(String text, int maxWidth, Font ft) {
String[] result = null;
Vector tempR = new Vector();
int lines = 0;
int len = text.length();
int index0 = 0;
int index1 = 0;
boolean wrap;
while (true) {
int widthes = 0;
wrap = false;
for (index0 = index1; index1 < len; index1++) {
if (text.charAt(index1) == '\n') {
index1++;
wrap = true;
break;
}
widthes = ft.charWidth(text.charAt(index1)) + widthes;
if (widthes > maxWidth) {
break;
}
}
lines++;
if (wrap) {
tempR.addElement(text.substring(index0, index1 - 1));
} else {
tempR.addElement(text.substring(index0, index1));
}
if (index1 >= len) {
break;
}
}
result = new String[lines];
tempR.copyInto(result);
return result;
}
public static String[] split(String original, String separator) {
Vector nodes = new Vector();
//System.out.println("split start...................");
//Parse nodes into vector
int index = original.indexOf(separator);
while(index>=0) {
nodes.addElement( original.substring(0, index) );
original = original.substring(index+separator.length());
index = original.indexOf(separator);
}
// Get the last node
nodes.addElement( original );
// Create splitted string array
String[] result = new String[ nodes.size() ];
if( nodes.size()>0 ) {
for(int loop=0; loop<nodes.size(); loop++)
{
result[loop] = (String)nodes.elementAt(loop);
//System.out.println(result[loop]);
}
}
return result;
}
}
package com.token.util;
import java.util.Vector;
import javax.microedition.lcdui.Font;
public class StringDealMethod {
public StringDealMethod()
{
}
// 字符串切割,实现字符串自动换行
public static String[] format(String text, int maxWidth, Font ft) {
String[] result = null;
Vector tempR = new Vector();
int lines = 0;
int len = text.length();
int index0 = 0;
int index1 = 0;
boolean wrap;
while (true) {
int widthes = 0;
wrap = false;
for (index0 = index1; index1 < len; index1++) {
if (text.charAt(index1) == '\n') {
index1++;
wrap = true;
break;
}
补充:软件开发 , Java ,