将java.awt.*代码转换为Android.graphics.*代码

我正在尝试移植一些使用

java.awt.*

library编写的图形代码，以替代使用

android.graphics.*

library。然而，我在图形方面没有太多经验

下面是

java.awt.*

代码（有效）：

这是MyImageBitmap类：

/**
 * A <code>MyImageBitmap</code> instance contains an image information in bitmap format.
 */
public class MyImageBitmap implements Serializable {

    //...member variables

    /**
     * Creates an instance of <code>MyImageBitmap</code> with specified data.
     *
     * @param pixels    the image pixes, not null
     * @param width     the image width, not null
     * @param height    the image height, not null
     * @param ppi       pixel per inch, not null
     * @param depth     the image depth, not null
     * @param lossyFlag lossy flag, not null
     */
    public MyImageBitmap(byte[] pixels, int width, int height, int ppi, int depth, int lossyFlag) {
        this.pixels = pixels;
        this.width = width;
        this.height = height;
        this.ppi = ppi;
        this.depth = depth;
        this.lossyFlag = lossyFlag;

        this.length = pixels != null ? pixels.length : 0;
    }

    //...getters
}

这是我尝试过的（没有成功）：

private byte[]转换（MyImageBitmap MyImageBitmap，字符串格式）{
int width=myImageBitmap.getWidth（）；
int height=myImageBitmap.getHeight（）；
字节[]imgRGB888=myImageBitmap.getPixels（）；
位图bmp2=Bitmap.createBitmap（宽度、高度、Bitmap.Config.ARGB_8888）；
int[]颜色=新int[宽度*高度]；
int r，g，b；
对于（int ci=0；ci

---

当我运行上面的代码时（我尝试在awt代码上进行移植），我在这一行上得到了一个

ArrayIndexOutOfBoundsException

，

r=（int）（0xFF&imgRGB888[3*ci]）
我最终弄明白了问题所在。我的转换算法
字节数组到int颜色数组错误。下面是正确的实现。图像现在已正确显示在Android
图像视图中

    /**
     * Converts the given <code>MyImageBitmap</code> to the specified image format and returns it as byte array.
     *
     * @param myImageBitmap the given bitmap, not null
     * @param format the given target image format, not null
     * @return the converted data in byte array format, not null
     */
    private byte[] convert(MyImageBitmap myImageBitmap, String format) {
        int width = myImageBitmap.getWidth();
        int height = myImageBitmap.getHeight();

        byte[] imgRGB888 = myImageBitmap.getPixels();

        Bitmap bmp2 = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);

        int[] colors = new int[width * height];

        //We need to convert the image from a byte array to a
        // int color array so we can create the Android Bitmap
        int r,g,b;
        for (int ci = 0; ci < colors.length; ci++) {
            r = (int)(0x000000ff & imgRGB888[ci]);
            g = (int)(0x000000ff & imgRGB888[ci]);
            b = (int)(0x000000ff & imgRGB888[ci]);
            colors[ci] = Color.rgb(r, g, b);
        }

        bmp2.setPixels(colors, 0, width, 0, 0, width, height);

        Bitmap.CompressFormat compressFormat;

        if (format.equals("jpeg")){
            compressFormat = android.graphics.Bitmap.CompressFormat.JPEG;
        }else{//must be png
            compressFormat = android.graphics.Bitmap.CompressFormat.PNG;
        }

        try (ByteArrayOutputStream outputStream = new ByteArrayOutputStream()){
            bmp2.compress(compressFormat, 100, outputStream);
            return outputStream.toByteArray();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

我最终弄明白了问题所在。我的转换算法
字节数组到int颜色数组错误。下面是正确的实现。图像现在已正确显示在Android
图像视图中

    /**
     * Converts the given <code>MyImageBitmap</code> to the specified image format and returns it as byte array.
     *
     * @param myImageBitmap the given bitmap, not null
     * @param format the given target image format, not null
     * @return the converted data in byte array format, not null
     */
    private byte[] convert(MyImageBitmap myImageBitmap, String format) {
        int width = myImageBitmap.getWidth();
        int height = myImageBitmap.getHeight();

        byte[] imgRGB888 = myImageBitmap.getPixels();

        Bitmap bmp2 = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);

        int[] colors = new int[width * height];

        //We need to convert the image from a byte array to a
        // int color array so we can create the Android Bitmap
        int r,g,b;
        for (int ci = 0; ci < colors.length; ci++) {
            r = (int)(0x000000ff & imgRGB888[ci]);
            g = (int)(0x000000ff & imgRGB888[ci]);
            b = (int)(0x000000ff & imgRGB888[ci]);
            colors[ci] = Color.rgb(r, g, b);
        }

        bmp2.setPixels(colors, 0, width, 0, 0, width, height);

        Bitmap.CompressFormat compressFormat;

        if (format.equals("jpeg")){
            compressFormat = android.graphics.Bitmap.CompressFormat.JPEG;
        }else{//must be png
            compressFormat = android.graphics.Bitmap.CompressFormat.PNG;
        }

        try (ByteArrayOutputStream outputStream = new ByteArrayOutputStream()){
            bmp2.compress(compressFormat, 100, outputStream);
            return outputStream.toByteArray();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * Converts the given <code>MyImageBitmap</code> to the specified image format and returns it as byte array.
     *
     * @param myImageBitmap the given bitmap, not null
     * @param format the given target image format, not null
     * @return the converted data in byte array format, not null
     */
    private byte[] convert(MyImageBitmap myImageBitmap, String format) {
        int width = myImageBitmap.getWidth();
        int height = myImageBitmap.getHeight();

        byte[] imgRGB888 = myImageBitmap.getPixels();

        Bitmap bmp2 = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);

        int[] colors = new int[width * height];

        //We need to convert the image from a byte array to a
        // int color array so we can create the Android Bitmap
        int r,g,b;
        for (int ci = 0; ci < colors.length; ci++) {
            r = (int)(0x000000ff & imgRGB888[ci]);
            g = (int)(0x000000ff & imgRGB888[ci]);
            b = (int)(0x000000ff & imgRGB888[ci]);
            colors[ci] = Color.rgb(r, g, b);
        }

        bmp2.setPixels(colors, 0, width, 0, 0, width, height);

        Bitmap.CompressFormat compressFormat;

        if (format.equals("jpeg")){
            compressFormat = android.graphics.Bitmap.CompressFormat.JPEG;
        }else{//must be png
            compressFormat = android.graphics.Bitmap.CompressFormat.PNG;
        }

        try (ByteArrayOutputStream outputStream = new ByteArrayOutputStream()){
            bmp2.compress(compressFormat, 100, outputStream);
            return outputStream.toByteArray();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }