Android 使用Glide加载网络图片等比例缩放的实现方法

/**
 * ===========================================
 * 版  本：1.0
 * 描  述：设置图片等比缩放
 * <p>glide处理图片.</p>
 * ===========================================
 */
public class TransformationUtils extends ImageViewTarget<Bitmap> {
  private ImageView target;
  public TransformationUtils(ImageView target) {
    super(target);
    this.target = target;
  }
  @Override
  protected void setResource(Bitmap resource) {
    view.setImageBitmap(resource);
    //获取原图的宽高
    int width = resource.getWidth();
    int height = resource.getHeight();
    //获取imageView的宽
    int imageViewWidth = target.getWidth();
    //计算缩放比例
    float sy = (float) (imageViewWidth * 0.1) / (float) (width * 0.1);
    //计算图片等比例放大后的高
    int imageViewHeight = (int) (height * sy);
    ViewGroup.LayoutParams params = target.getLayoutParams();
    params.height = imageViewHeight;
    target.setLayoutParams(params);
  }
}

Glide.with(this)
          .load(newActiviteLeftBannerUrl)
          .asBitmap()
          .placeholder(R.drawable.placeholder)
          .into(new TransformationUtils(target));