android - Android：在另一个图像的中心绘制图像

Question

我有一个图像image 1，一个来自服务器，image 2我试图在第一个图像的中心绘制第二个图像。结果我想要图片中的单个图像。

Answer 1

这应该可以满足您的需求：

backgroundBitmap变量将是 your和image1thebitmapToDrawInTheCenter将是 your image2。

public void centerImageInOtherImage()
{
    Bitmap backgroundBitmap        = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);
    Bitmap bitmapToDrawInTheCenter = BitmapFactory.decodeResource(getResources(), R.drawable.ic_action_search);
    
    Bitmap resultingBitmap = Bitmap.createBitmap(backgroundBitmap.getWidth(), backgroundBitmap.getHeight(), backgroundBitmap.getConfig());

    Canvas canvas = new Canvas(resultingBitmap);
    canvas.drawBitmap(backgroundBitmap, new Matrix(), null);
    canvas.drawBitmap(bitmapToDrawInTheCenter, (backgroundBitmap.getWidth() - bitmapToDrawInTheCenter.getWidth()) / 2, (backgroundBitmap.getHeight() - bitmapToDrawInTheCenter.getHeight()) / 2, new Paint());
    
    ImageView image = (ImageView)findViewById(R.id.myImage);
    image.setImageBitmap(resultingBitmap);
}

Answer 2

礼貌：在 Android 中的另一个图像上绘制文本/图像

使用 Canvas 相互绘制图像相当简单。画布基本上充当绘图板来绘制文本/图像。您只需要使用第一个 Image 构建一个画布，然后在中心绘制第二个 Image，如下所示

/* This ImageOne will be used as the canvas to draw an another image over it. Hence we make it mutable using the copy API
as shown below
*/
      Bitmap imageOne = BitmapFactory.decodeResource(getResources(), R.drawable.imageOne).copy(Bitmap.Config.ARGB_8888,true);
      // Decoding the image two resource into a Bitmap
      Bitmap imageTwo= BitmapFactory.decodeResource(getResources(), R.drawable.imageTwo);
      // Here we construct the canvas with the specified bitmap to draw onto
      Canvas canvas=new Canvas(imageOne);

/*Here we draw the image two on the canvas using the drawBitmap API.
drawBitmap takes in four parameters
1 . The Bitmap to draw
2.  X co-ordinate to draw from
3.  Y co ordinate to draw from
4.  Paint object to define style
*/
      canvas.drawBitmap(imageTwo,(imageOne.getWidth())/2,(imageOne.getHeight())/2,new Paint());

      imageView.setImageBitmap(imageOne);