Android:padding留下了一个白色的位图

Question

如何设置Bitmap左侧10行的全白？我有一个必须在左侧填充的位图.我想我可以创建一个新的图像迭代旧的一个getpixel为每个位置和setpixel在新的(白色或彩色)比返回新的位图...这是错的吗？有什么建议吗？非常感谢!

Answer 1

您可以使用额外的填充像素数创建一个新的位图.将其设置为画布位图并使用所需颜色为整个图像着色,然后复制位图.

public Bitmap pad(Bitmap Src, int padding_x, int padding_y) {
    Bitmap outputimage = Bitmap.createBitmap(Src.getWidth() + padding_x,Src.getHeight() + padding_y, Bitmap.Config.ARGB_8888);
    Canvas can = new Canvas(outputimage);
    can.drawARGB(FF,FF,FF,FF); //This represents White color
    can.drawBitmap(Src, padding_x, padding_y, null);
    return outputimage;
}

Answer 2

public Bitmap addPaddingTopForBitmap(Bitmap bitmap, int paddingTop) {
    Bitmap outputBitmap = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight() + paddingTop, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(outputBitmap);
    canvas.drawColor(Color.RED);
    canvas.drawBitmap(bitmap, 0, paddingTop, null);
    return outputBitmap;
}

public Bitmap addPaddingBottomForBitmap(Bitmap bitmap, int paddingBottom) {
    Bitmap outputBitmap = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight() + paddingBottom, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(outputBitmap);
    canvas.drawColor(Color.RED);
    canvas.drawBitmap(bitmap, 0, 0, null);
    return outputBitmap;
}


public Bitmap addPaddingRightForBitmap(Bitmap bitmap, int paddingRight) {
    Bitmap outputBitmap = Bitmap.createBitmap(bitmap.getWidth() + paddingRight, bitmap.getHeight(), Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(outputBitmap);
    canvas.drawColor(Color.RED);
    canvas.drawBitmap(bitmap, 0, 0, null);
    return outputBitmap;
}

public Bitmap addPaddingLeftForBitmap(Bitmap bitmap, int paddingLeft) {
    Bitmap outputBitmap = Bitmap.createBitmap(bitmap.getWidth() + paddingLeft, bitmap.getHeight(), Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(outputBitmap);
    canvas.drawColor(Color.RED);
    canvas.drawBitmap(bitmap, paddingLeft, 0, null);
    return outputBitmap;
}

Answer 3

您可能想看看这里：

http://download.oracle.com/javase/1.4.2/docs/api/java/awt/image/BufferedImage.html

您可能想要使用的方法是： getHeight() 然后您知道要设置多少像素并迭代 10 列

和 setRGB(int x, int y, int RGB) 设置像素