93 lines
4.2 KiB
Markdown
93 lines
4.2 KiB
Markdown
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Android Camera2Video Sample (Kotlin)
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====================================
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This sample shows how to record video using the new Camera2 API in Android Lollipop.
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Introduction
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------------
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Android Lollipop introduced a new camera API, called camera2. This sample uses [CameraDevice][1]
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and [CameraCaptureSession][2] to record video. It also uses a custom [TextureView][3] to render the output.
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The main steps are:
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1. Create a custom TextureView class and add it to the layout. The purpose of the custom TextureView is
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to be able to draw itself according to an aspect ratio, which is set via a public method. Additionally,
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the `onMeasure(int widthMeasureSpec, int heightMeasureSpec)` method is overridden, using the aspect ratio.
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2. Implement a `TextureView.SurfaceTextureListener` on your TextureView, and override its
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`onSurfaceTextureSizeChanged(SurfaceTexture surfaceTexture, int width, int height)` method to calculate
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the matrix to apply to the TextureView so the camera output fits. Use the method `setTransform(matrix)` on
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the TextureView.
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3. Implement a [`CameraDevice.StateCallback`][4] to receive events about changes of the state of the
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camera device. Override its methods to set your CameraDevice instance, start the preview, and stop
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and release the camera.
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4. When starting the preview, set up the MediaRecorder to accept video format.
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5. Then, set up a [`CaptureRequest.Builder`][5] using `createCaptureRequest(CameraDevice.TEMPLATE_RECORD)`
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on your CameraDevice instance.
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6. Then, implement a [`CameraCaptureSession.StateCallback`][6], using the method
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`createCaptureSession(surfaces, new CameraCaptureSession.StateCallback(){})` on your CameraDevice instance,
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where `surfaces` is a list consisting of the surface view of your TextureView and the surface of
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your MediaRecorder instance.
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7. Use `start()` and `stop()` methods on your MediaRecorder instance to actually start and stop the recording.
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8. Lastly, set up and clean up your camera device in `onResume()` and `onPause()`.
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[1]: https://developer.android.com/reference/android/hardware/camera2/CameraDevice.html
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[2]: http://developer.android.com/reference/android/hardware/camera2/CameraCaptureSession.html
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[3]: http://developer.android.com/reference/android/view/TextureView.html
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[4]: https://developer.android.com/reference/android/hardware/camera2/CameraDevice.StateCallback.html
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[5]: http://developer.android.com/reference/android/hardware/camera2/CaptureRequest.Builder.html
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[6]: http://developer.android.com/reference/android/hardware/camera2/CameraCaptureSession.StateCallback.html
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Pre-requisites
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--------------
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- Android SDK 27
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- Android Support Repository
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Screenshots
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-------------
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<img src="screenshots/1-launch.png" height="400" alt="Screenshot"/>
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<img src="screenshots/2-record.png" height="400" alt="Screenshot"/>
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<img src="screenshots/3-save.png" height="400" alt="Screenshot"/>
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Getting Started
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---------------
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This sample uses the Gradle build system. To build this project, use the
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"gradlew build" command or use "Import Project" in Android Studio.
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Support
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-------
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- Google+ Community: https://plus.google.com/communities/105153134372062985968
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- Stack Overflow: http://stackoverflow.com/questions/tagged/android
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If you've found an error in this sample, please file an issue:
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https://github.com/googlesamples/android-Camera2Video
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Patches are encouraged, and may be submitted by forking this project and
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submitting a pull request through GitHub. Please see CONTRIBUTING.md for more details.
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License
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-------
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Copyright 2018 The Android Open Source Project, Inc.
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Licensed to the Apache Software Foundation (ASF) under one or more contributor
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license agreements. See the NOTICE file distributed with this work for
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additional information regarding copyright ownership. The ASF licenses this
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file to you under the Apache License, Version 2.0 (the "License"); you may not
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use this file except in compliance with the License. You may obtain a copy of
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the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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License for the specific language governing permissions and limitations under
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the License.
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