[null,null,["最后更新时间 (UTC)：2025-08-23。"],[],[],null,["# ImageBitmap vs ImageVector\n\nThe two most common kinds of image formats are raster and vector images.\n\nA raster graphic format contains pixels: tiny individual squares that contain a\ncolor (made up of red, green, blue, and alpha values). When placing a lot of\npixels together, a very detailed image can be formed, such as a photograph. A\nraster graphic has a fixed resolution (fixed number of pixels). This means that\nwhen you increase the size of the image, it loses detail, and pixelation can\noccur. Examples of raster graphic formats are JPEG, PNG, and WEBP.\n**Figure 1**: JPEG file example\n\nVector images, on the other hand, are scalable mathematical representations of a\nvisual element on screen. A vector is a set of commands describing how to draw\nthe image on screen- for instance, a line, point, or fill. When scaling a vector\non screen, it will not lose quality as the mathematical formula will maintain\nthe relationship between the different commands. A good example of ImageVector\nare the Material [Symbols](https://fonts.google.com/icons), as they can all be defined with\nmathematical formulas.\n**Figure 2**: Vector example (file extensions are .xml or defined in Kotlin code)\n\n`ImageBitmap`\n-------------\n\nIn Compose, a raster image (often referred to as a `Bitmap`) can be loaded up\ninto an `ImageBitmap` instance, and a `BitmapPainter` is what is responsible for\ndrawing the bitmap to screen.\n\nFor simple use cases, the `painterResource()` can be used which takes care of\ncreating an `ImageBitmap` and returns a `Painter` object (in this case - a\n`BitmapPainter`):\n\n\n```kotlin\nImage(\n painter = painterResource(id = R.drawable.dog),\n contentDescription = stringResource(id = R.string.dog_content_description)\n)https://github.com/android/snippets/blob/dd30aee903e8c247786c064faab1a9ca8d10b46e/compose/snippets/src/main/java/com/example/compose/snippets/images/VectorVsBitmapSnippets.kt#L49-L52\n```\n\n\u003cbr /\u003e\n\nIf you require further customization (for instance a [custom painter\nimplementation](/develop/ui/compose/graphics/images/custompainter)) and need access to the `ImageBitmap` itself, you can load it\nin the following way:\n\n\n```kotlin\nval imageBitmap = ImageBitmap.imageResource(R.drawable.dog)https://github.com/android/snippets/blob/dd30aee903e8c247786c064faab1a9ca8d10b46e/compose/snippets/src/main/java/com/example/compose/snippets/images/VectorVsBitmapSnippets.kt#L56-L56\n```\n\n\u003cbr /\u003e\n\n`ImageVector`\n-------------\n\nA `VectorPainter` is responsible for drawing an `ImageVector` to screen.\n`ImageVector` supports a subset of SVG commands. Not all images can be\nrepresented as vectors (for example, the photos you take with your camera cannot\nbe transformed into a vector).\n\nYou can create a custom `ImageVector` either by importing an existing vector\ndrawable XML file (imported into Android Studio using the [import tool](/studio/write/vector-asset-studio#running)) or\nimplementing the class and issuing path commands manually.\n\nFor simple use cases, the same way in which `painterResource()` works for the\n`ImageBitmap` class, it also works for `ImageVectors`, returning a\n`VectorPainter` as the result. `painterResource()` handles the loading of\n`VectorDrawables` and `BitmapDrawables` into `VectorPainter` and `BitmapPainter`\nrespectively. To load a `VectorDrawable` into an image, use:\n\n\n```kotlin\nImage(\n painter = painterResource(id = R.drawable.baseline_shopping_cart_24),\n contentDescription = stringResource(id = R.string.shopping_cart_content_desc)\n)https://github.com/android/snippets/blob/dd30aee903e8c247786c064faab1a9ca8d10b46e/compose/snippets/src/main/java/com/example/compose/snippets/images/VectorVsBitmapSnippets.kt#L64-L67\n```\n\n\u003cbr /\u003e\n\nIf you'd require further customization and need to access to the `ImageVector`\nitself, you can load it in the following way:\n\n\n```kotlin\nval imageVector = ImageVector.vectorResource(id = R.drawable.baseline_shopping_cart_24)https://github.com/android/snippets/blob/dd30aee903e8c247786c064faab1a9ca8d10b46e/compose/snippets/src/main/java/com/example/compose/snippets/images/VectorVsBitmapSnippets.kt#L71-L71\n```\n\n\u003cbr /\u003e\n\nRecommended for you\n-------------------\n\n- Note: link text is displayed when JavaScript is off\n- [Custom painter {:#custom-painter}](/develop/ui/compose/graphics/images/custompainter)\n- [Resources in Compose](/develop/ui/compose/resources)\n- [Loading images {:#loading-images}](/develop/ui/compose/graphics/images/loading)"]]
