Question

我在这里编写了以下代码，背景图片正在显示，但图片并未覆盖整个背景

private Bitmap background;
    int mWidth = Display.getWidth();
    int mHeight = Display.getHeight();

    public MyScreen()
    {        
        // Set the displayed title of the screen  
        //backgroundBitmap = Bitmap.getBitmapResource("slidimage.png");
        final Bitmap background = Bitmap.getBitmapResource("slidimage.png");

        HorizontalFieldManager vfm = new HorizontalFieldManager(USE_ALL_HEIGHT | USE_ALL_WIDTH) {
               public void paint(Graphics g) {
                    g.drawBitmap(0, 0,mWidth, mHeight, background, 0, 0);
                    super.paint(g);
               }
        };

        add(vfm);

Answer 1

public static Bitmap resizeBitmap(Bitmap image, int width, int height)
    {   
        int rgb[] = new int[image.getWidth()*image.getHeight()];
        image.getARGB(rgb, 0, image.getWidth(), 0, 0, image.getWidth(), image.getHeight());        
        int rgb2[] = rescaleArray(rgb, image.getWidth(), image.getHeight(), width, height);
        Bitmap temp2 = new Bitmap(width, height);        
        temp2.setARGB(rgb2, 0, width, 0, 0, width, height);        
        return temp2;
    }

您可以使用上述方法调整图像大小只需传递要调整大小的图像及其宽度和高度。并且该函数将返回已调整大小的图像。

其中rescale Array是以下方法

private static int[] rescaleArray(int[] ini, int x, int y, int x2, int y2)
    {
        int out[] = new int[x2*y2];
        for (int yy = 0; yy < y2; yy++)
        {
            int dy = yy * y / y2;
            for (int xx = 0; xx < x2; xx++)
            {
                int dx = xx * x / x2;
                out[(x2 * yy) + xx] = ini[(x * dy) + dx];
            }
        }
        return out;
    }

如何设置适合黑莓应用程序的背景图像

1 个答案: