【实习项目记录】(三)调整网络图片固定宽高

// 下载图片
Bitmap bitmap = PosterBmpProvider.getInstance().loadImage(url);

LinearLayout.LayoutParams linearParams = (LinearLayout.LayoutParams) viewHolder.img

                .getLayoutParams(); // 取控件View当前的布局参数
                int width = bitmap.getWidth();
                int height = bitmap.getHeight();
                // 定义预转换成的图片的宽度和高度
                int newWidth = SystemUtils.getScreenWidth(mContext) *4 / 6;
                int newHeight = SystemUtils.getScreenWidth(mContext) * 3 / 7;

                float scaleWidth = ((float) newWidth) / width;
                float scaleHeight = ((float) newHeight) / height;

                // 创建操作图片用的matrix对象
                Matrix matrix = new Matrix();
                // 缩放图片动作
                matrix.postScale(scaleWidth, scaleHeight);
                // 创建新的图片
                Bitmap resizedBitmap = Bitmap.createBitmap(bitmap, 0, 0, width,
                        height, matrix, true);
                viewHolder.img.setImageBitmap(resizedBitmap);