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---
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layout: page
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title: "Debugging"
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category: docs
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Improve realtime filters (#535)
* Simplify Filters class
* Simplify filter switching in demo app
* Create FilterCameraPreview, improve GlCameraPreview
* Add comments
* Cleanup EglViewport
* Rename setPreviewingViewSize
* Create Filter interface and BaseFilter abstract class
* Move GL drawing code into BaseFilter
* Avoid releasing location pointers
* Add more docs and Filter.copy()
* Split two packages
* Remove filters package from code coverage computation
* Document all filters, implement onCopy, suppress warnings
* Add javadocs in Filters class
* Move NoFilter, add string resources
* XML support, require experimental flag
* Update first 6 filters with onPreDraw
* Update DuotoneFilter with onPreDraw
* Update FillLightFilter with onPreDraw
* Update Gamma, Grain, Grayscale, Hue, InvertColors, Lomoish with onPreDraw
* Update Posterize, Saturation, Sepia with onPreDraw
* Update all filters with onPreDraw
* Add OneParameterFilter and TwoParameterFilter
* Implement OneParameterFilter and TwoParameterFilter in all filters
* Improve comments
* Remove commented out code in demo
* Add FilterParser test
* Add GlCameraPreview and CameraView tests
* Add documentation
* Fix tests
5 years ago
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order: 14
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date: 2018-12-20 20:02:38
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disqus: 1
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---
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`CameraView` will log a lot of interesting events related to the camera lifecycle. These are important
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to identify bugs. The default logger will simply use Android `Log` methods posting to logcat.
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You can attach and detach external loggers using `CameraLogger.registerLogger()`:
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```java
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CameraLogger.registerLogger(new Logger() {
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@Override
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public void log(@LogLevel int level, String tag, String message, @Nullable Throwable throwable) {
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// For example...
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Crashlytics.log(message);
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}
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});
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```
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Make sure you enable the logger using `CameraLogger.setLogLevel(@LogLevel int)`. The default will only
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log error events.
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