J2ME游戏只移植到Android平台(一)

为了让J2ME游戏无需大的改动就可以在Android的平台下，我是在利用Android平台的类库拼接成J2ME类，如用Android的canvas类和paint类拼接成J2me的Graphics类，用Bitmap重写J2ME的Image类。最终得到一个中间件包！

Font类的代码：

import android.graphics.Paint;import android.graphics.Paint.FontMetrics;import android.graphics.Typeface;//复写J2ME的Font类中的变量和函数public class Font {public static final int FACE_MONOSPACE = 32;public static final int FACE_PROPORTIONAL = 64;public static final int FACE_SYSTEM = 0;public static final int FONT_INPUT_TEXT = 1;public static final int FONT_STATIC_TEXT = 0;public static final int SIZE_LARGE = 32;public static final int SIZE_MEDIUM = 24;public static final int SIZE_SMALL = 16;public static final int STYLE_BOLD = 1;public static final int STYLE_ITALIC = 2;public static final int STYLE_PLAIN = 0;public static final int STYLE_UNDERLINED = 4;//在J2ME的graphics 在android 就是Paint//Paint 其实要比graphics 分装的东西要多，包括字体的大小也是有其控制的private Paint paint;private int face, style, size;//measureText 来测量字体的长度int charsWidth(char[] ch, int offset, int length) {return (int) paint.measureText(ch, offset, length);}int charWidth(char ch) {char[] charArr = new char[1];charArr[0] = ch;return (int) paint.measureText(charArr, 0, charArr.length);}int getBaselinePosition() {FontMetrics fm = paint.getFontMetrics();return (int) fm.bottom;}private Font() {face = FACE_SYSTEM;style = STYLE_PLAIN;size = SIZE_MEDIUM;setPaintAtt(paint);}private Font(int face, int style, int size) {this.face = face;this.style = style;this.size = size;setPaintAtt(paint);}private Font(Paint paint, int face, int style, int size) {setPaintAtt(paint);}//android 中字体的样式都是由Typeface控制public void setPaintAtt(Paint paint) {this.paint = paint;if (paint == null)paint = new Paint();switch (face) {case FACE_MONOSPACE:paint.setTypeface(Typeface.MONOSPACE);break;case FACE_PROPORTIONAL:break;case FACE_SYSTEM:paint.setTypeface(Typeface.DEFAULT);break;}paint.setAntiAlias(true);switch (style) {case STYLE_BOLD:paint.setTypeface(Typeface.defaultFromStyle(Typeface.BOLD));break;case STYLE_ITALIC:paint.setTypeface(Typeface.defaultFromStyle(Typeface.ITALIC));break;case STYLE_PLAIN:paint.setTypeface(Typeface.defaultFromStyle(Typeface.NORMAL));break;case STYLE_UNDERLINED:// paint.setTypeface(Typeface.SERIF);break;}paint.setTextSize(size);}public static Font getFont(int face, int style, int size) {Font font = new Font(face, style, size);return font;}public static Font getFont(int fontSpecifier) {switch (fontSpecifier) {case FONT_INPUT_TEXT:return getFont(FACE_SYSTEM, SIZE_MEDIUM, STYLE_UNDERLINED);case FONT_STATIC_TEXT:return getFont(FACE_SYSTEM, SIZE_MEDIUM, STYLE_ITALIC);default:return new Font();}}public static Font getDefaultFont() {return new Font();}public static Font getFont(Paint paint) {Font font = new Font();font.paint = paint;font.size = (int) paint.getTextSize();return font;}public int getFace() {// Typeface tf = paint.getTypeface();return 0;}//这里字体的高度复写了一下，大家请参考一下apipublic int getHeight() {FontMetrics fm = paint.getFontMetrics();return (int) Math.ceil(fm.descent - fm.ascent);}public int getSize() {return (int) paint.getTextSize();}public int getStyle() {Typeface tf = paint.getTypeface();return tf.getStyle();}public boolean isBold() {Typeface tf = paint.getTypeface();return tf.isBold();}public boolean isItalic() {Typeface tf = paint.getTypeface();return tf.isItalic();}public boolean isPlain() {Typeface tf = paint.getTypeface();return tf.isItalic();}public boolean isUnderlined() {return paint.isUnderlineText();}public int stringWidth(String str) {return (int) paint.measureText(str);}public int substringWidth(String str, int offset, int len) {return (int) paint.measureText(str.substring(offset, offset + len));}}

Image类

import java.io.IOException;import java.io.InputStream;import lxs.slg.Game;import android.content.res.AssetManager;import android.content.res.Resources;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Matrix;import android.graphics.Paint;public class Image {//在android 中 图片对象是Bitmapprivate Bitmap img;private int alpha;private Image() {img = null;alpha = 0xff;}private Image(Bitmap img, int alpha) {this.img = img;this.alpha = alpha;}private Image(Image source) {this.img = source.img;this.alpha = source.alpha;}public static Image createImage(String src) {if (src.startsWith("/")) {src = src.substring(1);}//当前的activity对象//如下是标准的读取Bitmap方法Resources resources = Game.father.getResources();AssetManager assetManager = resources.getAssets();InputStream in = null;Bitmap img = null;try {in = assetManager.open(src);img = BitmapFactory.decodeStream(in);in.close();} catch (IOException e) {e.printStackTrace();}return new Image(img, 0xff);}public static Image createImage(byte[] imageData, int imageOffset,int imageLength) {//从byte对象创建一个Bitmap 是由BitmapFactory函数负责的Bitmap img = BitmapFactory.decodeByteArray(imageData, imageOffset,imageLength);return new Image(img, 0xff);}public static Image createImage(Image source) {return new Image(source);}public static Image createImage(Image image, int x, int y, int width,int height, int transform) {Bitmap bmp = Bitmap.createBitmap(image.img, x, y, width, height);Paint paint = new Paint();paint.setAlpha(image.alpha);Image tImage = createImage(width, height);Canvas canvas = new Canvas(tImage.img);//调用Graphics函数 获取旋转矩阵Matrix mMatrix = Graphics.getTransformMetrix(transform, width, height);//调用如下的函数将其绘制在兴建的Bitmap对象上canvas.drawBitmap(bmp, mMatrix, paint);return tImage;}public static Image createImage(InputStream stream) {Bitmap img = BitmapFactory.decodeStream(stream);return new Image(img, 0xff);}public static Image createImage(int width, int height) {//android 中创建Image 对象的函数Bitmap img = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);return new Image(img, 0xff);}public static Image createRGBImage(int[] rgb, int width, int height,boolean processAlpha) {Bitmap img;if (processAlpha) {img = Bitmap.createBitmap(rgb, width, height,Bitmap.Config.ARGB_8888);} else {//不需要支持透明的图片，我们采用差分颜色图片点阵标识img = Bitmap.createBitmap(rgb, width, height, Bitmap.Config.RGB_565);}return new Image(img, 0xff);}//获取图片的绘制对象public Graphics getGraphics() {Canvas canvas = new Canvas(img);Paint paint = new Paint();paint.setAlpha(alpha);return new Graphics(canvas, paint);}public void setAlpha(int alpha) {this.alpha = alpha;}public int getAlpha() {return alpha;}public Bitmap getImg() {return img;}public int getHeight() {return img.getHeight();}public void getRGB(int[] rgbData, int offset, int scanlength, int x, int y,int width, int height) {img.getPixels(rgbData, offset, scanlength, x, y, width, height);}public int getWidth() {return img.getWidth();}boolean isMutable() {return img.isMutable();}public void replaceColor(int newColor, int oldColor) {int width = img.getWidth();int height = img.getHeight();int[] pixels = new int[width * height];img.getPixels(pixels, 0, width, 0, 0, width, height);for (int i = 0; i < pixels.length; i++) {if ((pixels[i] | 0x00ffffff) == (oldColor | 0x00ffffff)) {pixels[i] = oldColor;}}img = Bitmap.createBitmap(pixels, 0, 0, height, height,Bitmap.Config.ARGB_8888);}}

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