Detailed explanation of Android ImageView

Detailed explanation of scaleType attribute

In Android, the properties of the ImageView control are used to specify the scaling and alignment of the image within . The properties can help you control how the image is displayed to fit the dimensions or achieve other specific display effects. The following are common attribute values ​​and their functions:scaleTypeImageViewscaleTypeImageViewscaleType

1. center: Default value. The image is centered inside ImageView and maintains its original proportions, possibly with margins.

2. centerCrop: Scales the image so that it fills ImageView while maintaining the original proportions. Part of the image may be cropped to fit ImageView.

3. centerInside: Scales the image so that it appears centered within ImageView, maintaining the original proportions. There may be margins, but the image will not be cropped.

4. fitCenter: Scales the image, keeping its original proportions, to fit ImageView and centers it horizontally and vertically. There may be margins, but the image will not be cropped.

5. fitStart: Scales the image, keeping original proportions, to fitImageView and closer horizontally and verticallyImageView The starting position is displayed.

6. fitEnd: Scale the image, keeping original proportions, to fitImageView and move closer horizontally and verticallyImageView The end position is displayed.

7. fitXY: Scales the image, stretching or compressing it to fill ImageView without maintaining the original proportions. May cause image distortion.

8. matrix: Custom matrix transformation. You can use matrices to implement arbitrary image transformations, but you need to write custom logic to implement it.

These scaleType attribute values ​​can be selected according to your needs to obtain the desired image display effect. For example, if you want the image to completely fill ImageView and maintain the original proportions, you can select centerCrop or fitCenter, depending on whether Allows cropping of images. If you need to implement more complex image transformation effects, you can select matrix and write custom logic.