j2me工具类：PalettedImage调色板类
该方法网上可以找到，我添加了一个重载函数：
public Image getPalettedImage(String path, int[] originalColors,
int[] palettedColors)
三个参数依次为图片路径、需要改变的旧颜色值、新的颜色值，注意这2个参数都为数组，长度必须一致，这样可以一次改变多种颜色。
用法：
PalettedImage p=new PalettedImage();
Image newImage=p.getPalettedImage("/Humans121.png", new int[]{0x0000ff}, new int[]{0x00ff00});
...
g.drawImage(newImage, 0, 0, 0);
import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.InputStream;import javax.microedition.lcdui.Image;public class PalettedImage {public Image getPalettedImage(String path, int[] originalColors,int[] palettedColors) {InputStream is = null;ByteArrayOutputStream baos = null;try {is = getClass().getResourceAsStream(path);baos = new ByteArrayOutputStream();int ch = 0;while ((ch = is.read()) != -1) {baos.write(ch);}} catch (IOException ioe) {System.out.println(ioe);} finally {try {if (baos != null)baos.close();if (is != null)is.close();}catch (IOException e) {System.out.println(e);}}return getPalettedImage(baos.toByteArray(), originalColors,palettedColors);}/* * 原始图片的byte数组，以及需要替换颜色的颜色值还有目标颜色值就行了。 因为可以同时替换多个颜色，所以输入参数是代表颜色的整形的数组。 * 总之，要保证原始颜色与目标颜色一一对应就好了 */ public Image getPalettedImage(byte[] data, int[] originalColors, int[] palettedColors) { byte[] tempData = new byte[data.length]; System.arraycopy(data, 0, tempData, 0, data.length); Image img = null; int[] parameter = { 0, 0, 0 }; analyze(tempData, parameter); for (int i = 0; i < originalColors.length; i++) { replaceColor(tempData, parameter, originalColors[i], palettedColors[i]); } fillData(tempData, parameter); try { img = Image.createImage(tempData, 0, data.length); } catch (Exception e) { System.out.println("getPalettedImage && " + e.toString()); } return img; } private void analyze(byte[] data, int[] para) { int offset = 8; int chunkLen = 0; while (data[offset + 4] != 0x50 || data[offset + 5] != 0x4c || data[offset + 6] != 0x54 || data[offset + 7] != 0x45) { chunkLen = readInt(data, offset); offset += (4 + 4 + chunkLen + 4); } chunkLen = readInt(data, offset); para[2] = chunkLen / 3; para[0] = offset + 8; para[1] = offset + 8 + chunkLen; } private int readInt(byte[] data, int offset) { return ((data[offset] & 0xFF) << 24) | ((data[offset + 1] & 0xFF) << 16) | ((data[offset + 2] & 0xFF) << 8) | (data[offset + 3] & 0xFF); } private void replaceColor(byte[] data, int[] para, int oldColor, int newColor) { byte rr = (byte) ((oldColor >> 16) & 0xff); byte gg = (byte) ((oldColor >> 8) & 0xff); byte bb = (byte) (oldColor & 0xff); for (int i = 0, offset = para[0], temp = 0; i < para[2]; i++, offset += 3) { if (rr == data[offset] && gg == data[offset + 1] && bb == data[offset + 2]) { data[offset] = (byte) ((newColor >> 16) & 0xff); data[offset + 1] = (byte) ((newColor >> 8) & 0xff); data[offset + 2] = (byte) (newColor & 0xff); break; } } } private void fillData(byte[] data, int[] para) { int checksum = update_crc(data, para[0] - 4, para[2] * 3 + 4); data[para[1]] = (byte) ((checksum >> 24) & 0xff); data[para[1] + 1] = (byte) ((checksum >> 16) & 0xff); data[para[1] + 2] = (byte) ((checksum >> 8) & 0xff); data[para[1] + 3] = (byte) ((checksum) & 0xff); } private int update_crc(byte[] buf, int off, int len) { int c = 0xffffffff; int n, k; int xx; int[] crc_table = new int[256]; for (n = 0; n < 256; n++) { xx = n; for (k = 0; k < 8; k++) { if ((xx & 1) == 1) { xx = 0xedb88320 ^ (xx >>> 1); } else { xx = xx >>> 1; } } crc_table[n] = xx; } for (n = off; n < len + off; n++) { c = crc_table[(c ^ buf[n]) & 0xff] ^ (c >>> 8); } return (c ^ 0xffffffff); }}