android - 通过在像素中合并两个图像，一个在另一个下面

我正在尝试加入图像并形成1个单一图像。这样做是将图像发送到服务器。

    //Obtain the bitmaps from drawabl folder
    Bitmap bm1 = BitmapFactory.decodeResource(getResources(), R.drawable.image);
    Bitmap bm2 = BitmapFactory.decodeResource(getResources(), R.drawable.img);
    //Create a buffer
   ByteBuffer buffer3 = ByteBuffer.allocate((bm1.getHeight()+bm2.getHeight()) *        (bm1.getRowBytes()+bm2.getRowBytes()));
    //copy the pixels to buffer
        bm2.copyPixelsToBuffer(buffer3);
        bm1.copyPixelsToBuffer(buffer3);
    //Covert to byteArray
        byte[] bytes = buffer3.array();
        int leftovers = buffer3.remaining();
        buffer3.compact();

//Finally forming a bitmap

  Bitmap bitmap = BitmapFactory.decodeByteArray(bytes , 0, bytes.length);
  ImageView img = (ImageView) findViewById(R.id.imgV);
  img.setImageBitmap(bitmap);

但是我面临的问题是我的“位图”即将为null。

谁能帮我加入图片。

最佳答案

在这种情况下，您可以如下使用画布

   public Bitmap mergeBitmap(Bitmap bitmap1, Bitmap bitmap2) {
    Bitmap mergedBitmap = null;

    int w, h = 0;

    h = bitmap1.getHeight() + bitmap2.getHeight();
    if (bitmap1.getWidth() > bitmap2.getWidth()) {
        w = bitmap1.getWidth();
    } else {
        w = bitmap2.getWidth();
    }

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

    Canvas canvas = new Canvas(mergedBitmap);

    canvas.drawBitmap(bitmap1, 0f, 0f, null);
    canvas.drawBitmap(bitmap2, 0f, bitmap1.getHeight(), null);


    return mergedBitmap;
}