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Camera2VideoKotlin

README.md

Android Camera2Video Sample (Kotlin)

This sample shows how to record video using the new Camera2 API in Android Lollipop.

Introduction

Android Lollipop introduced a new camera API, called camera2. This sample uses CameraDevice and CameraCaptureSession to record video. It also uses a custom TextureView to render the output.

The main steps are:

  1. Create a custom TextureView class and add it to the layout. The purpose of the custom TextureView is to be able to draw itself according to an aspect ratio, which is set via a public method. Additionally, the onMeasure(int widthMeasureSpec, int heightMeasureSpec) method is overridden, using the aspect ratio.
  2. Implement a TextureView.SurfaceTextureListener on your TextureView, and override its onSurfaceTextureSizeChanged(SurfaceTexture surfaceTexture, int width, int height) method to calculate the matrix to apply to the TextureView so the camera output fits. Use the method setTransform(matrix) on the TextureView.
  3. Implement a CameraDevice.StateCallback to receive events about changes of the state of the camera device. Override its methods to set your CameraDevice instance, start the preview, and stop and release the camera.
  4. When starting the preview, set up the MediaRecorder to accept video format.
  5. Then, set up a CaptureRequest.Builder using createCaptureRequest(CameraDevice.TEMPLATE_RECORD) on your CameraDevice instance.
  6. Then, implement a CameraCaptureSession.StateCallback, using the method createCaptureSession(surfaces, new CameraCaptureSession.StateCallback(){}) on your CameraDevice instance, where surfaces is a list consisting of the surface view of your TextureView and the surface of your MediaRecorder instance.
  7. Use start() and stop() methods on your MediaRecorder instance to actually start and stop the recording.
  8. Lastly, set up and clean up your camera device in onResume() and onPause().

Pre-requisites

  • Android SDK 27
  • Android Support Repository

Screenshots

Screenshot

Screenshot

Screenshot

Getting Started

This sample uses the Gradle build system. To build this project, use the "gradlew build" command or use "Import Project" in Android Studio.

Support

If you've found an error in this sample, please file an issue: https://github.com/googlesamples/android-Camera2Video

Patches are encouraged, and may be submitted by forking this project and submitting a pull request through GitHub. Please see CONTRIBUTING.md for more details.