将二维码与图像合并

我正在尝试将二维码与图像合并,但运气不好。它一直给我: Java语言lang.NullPointerException:尝试调用虚拟方法“int android”。图样位图。getWidth()'在空对象引用上。

下面是要调整大小和合并的类:

    public Bitmap mergeBitmaps(Bitmap myLogo, Bitmap bitmap){
    Bitmap combined = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), bitmap.getConfig());
    Canvas canvas = new Canvas(combined);
    int canvasWidth = canvas.getWidth();
    int canvasHeight = canvas.getHeight();
    canvas.drawBitmap(bitmap, new Matrix(), null);

    Bitmap resizeLogo = Bitmap.createScaledBitmap(myLogo, canvasWidth / 5, canvasHeight / 5, true);
    int centreX = (canvasWidth - resizeLogo.getWidth()) /2;
    int centreY = (canvasHeight - resizeLogo.getHeight()) / 2;
    canvas.drawBitmap(resizeLogo, centreX, centreY, null);
    return combined;
}

下面是我如何将其推入ImageView的:

    Bitmap myLogo = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher_background);
    Bitmap merge = mergeBitmaps(myLogo, bitmap);

    imageView.setImageBitmap(merge);

请帮助:(

编辑:nullpointerexcepion指向位图myLogo=BitmapFactory。解码资源(getResources(),R.drawable。ic_launcher_背景);