Utils.java 文件源码

/**
 * @returns A {@link Bitmap} for a {@link Drawable}.
 */
public static Bitmap drawableToBitmap(final Drawable drawable) {
    if (null == drawable) return null;
    if (drawable instanceof BitmapDrawable) {
        return ((BitmapDrawable) drawable).getBitmap();
    }

    final Bitmap bitmap = Bitmap.createBitmap(Math.max(0, drawable.getIntrinsicWidth()),
            Math.max(0, drawable.getIntrinsicHeight()), Bitmap.Config.ARGB_8888);
    final Canvas canvas = new Canvas(bitmap);

    // PictureDrawable's get handled separately.
    if (drawable instanceof PictureDrawable) {
        canvas.drawPicture(((PictureDrawable) drawable).getPicture());
        return bitmap;
    }

    drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
    drawable.draw(canvas);

    return bitmap;
}