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53 lines
1.9 KiB
53 lines
1.9 KiB
6 years ago
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---
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layout: page
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title: "Preview Size"
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subtitle: "Measuring behavior"
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category: docs
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order: 7
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date: 2018-12-20 22:07:17
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---
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`CameraView` has a smart measuring behavior that will let you do what you want with a few flags.
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Measuring is controlled simply by `layout_width` and `layout_height` attributes, with this meaning:
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|Value|Meaning|
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|-----|-------|
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|`WRAP_CONTENT`|CameraView will choose this dimension, in order to show the whole preview without cropping. The aspect ratio will be respected.|
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|`MATCH_PARENT`|CameraView will fill this dimension. Part of the content *might* be cropped.
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|Fixed values (e.g. `500dp`)|Same as `MATCH_PARENT`|
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This means that your visible preview can be of any size, not just the presets.
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Whatever you do, the preview will never be distorted - it can only be cropped
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if needed.
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### Examples
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##### Center Inside
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By setting both dimensions to `WRAP_CONTENT`, you can emulate a **center inside** behavior.
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The view will try to fill the available space, but respecting the stream aspect ratio.
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```xml
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<com.otaliastudios.cameraview.CameraView
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android:layout_width="wrap_content"
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android:layout_height="wrap_content" />
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```
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This means that the whole preview is visible, and the image output matches what was visible
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during the preview.
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##### Center Crop
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By setting both dimensions to `MATCH_PARENT` or fixed values, you can emulate a **center crop**
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behavior. The camera view will fill the rect. If your dimensions don't match the aspect ratio
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of the internal preview surface, the surface will be cropped to fill the view.
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```xml
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<com.otaliastudios.cameraview.CameraView
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android:layout_width="match_parent"
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android:layout_height="match_parent" />
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```
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This means that part of the preview might be hidden, and the output might contain parts of the scene
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that were not visible during the capture, **unless it is taken as a snapshot, since snapshots account for cropping**.
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