在Android中以编程方式添加图片WaterMark

Question

我正在尝试将一个图像水印添加到另一个图像。我有以下代码，但我面临一个问题。我不知道这个“资源资源”是什么。

有人能帮上忙吗？

public static Bitmap addWatermark(Resources res, Bitmap source)
{
     int w, h;
     Canvas c;
     Paint paint;
     Bitmap bmp, watermark;

     Matrix matrix;
     float scale;
     RectF r;

     w = source.getWidth();
     h = source.getHeight();


    bmp = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);

    paint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.DITHER_FLAG |Paint.FILTER_BITMAP_FLAG);         


    c = new Canvas(bmp);
    c.drawBitmap(source, 0, 0, paint);

    watermark = BitmapFactory.decodeResource(res, R.drawable.android_mo);
    scale = (float) (((float) h * 0.10) / (float) watermark.getHeight());

    matrix = new Matrix();
    matrix.postScale(scale, scale);
    r = new RectF(0, 0, watermark.getWidth(), watermark.getHeight());
    matrix.mapRect(r);
    matrix.postTranslate(w - r.width(), h - r.height());

    c.drawBitmap(watermark, matrix, paint);
    watermark.recycle();

    return bmp;
}

Answer 1

它是您可以通过activity.getResources()或fragment.getResources()获得的资源对象

Answer 2

Resources res 

是您需要从调用活动/片段传递的资源对象。

假设，如果该方法在Utility类中，则按如下方式调用该方法

//Add watermark to the selected image
  Bitmap markedBitmap = Utility.addWatermark(context.getResources(), bitmap);

Answer 3

主位图为bmp1和bmp2透明位图：

 public static Bitmap overlay(Bitmap bmp1, Bitmap bmp2) {
            Bitmap bmOverlay = Bitmap.createBitmap(bmp1.getWidth(), bmp1.getHeight(), bmp1.getConfig());
            Canvas canvas = new Canvas(bmOverlay);
            canvas.drawBitmap(bmp1, new Matrix(), null);
            canvas.drawBitmap(bmp2, 0, 0, null);
            return bmOverlay;
        }