1 2Android Camera2Video Sample (Kotlin) 3==================================== 4 5This sample shows how to record video using the new Camera2 API in Android Lollipop. 6 7Introduction 8------------ 9 10Android Lollipop introduced a new camera API, called camera2. This sample uses [CameraDevice][1] 11and [CameraCaptureSession][2] to record video. It also uses a custom [TextureView][3] to render the output. 12 13The main steps are: 14 151. Create a custom TextureView class and add it to the layout. The purpose of the custom TextureView is 16to be able to draw itself according to an aspect ratio, which is set via a public method. Additionally, 17the `onMeasure(int widthMeasureSpec, int heightMeasureSpec)` method is overridden, using the aspect ratio. 182. Implement a `TextureView.SurfaceTextureListener` on your TextureView, and override its 19`onSurfaceTextureSizeChanged(SurfaceTexture surfaceTexture, int width, int height)` method to calculate 20the matrix to apply to the TextureView so the camera output fits. Use the method `setTransform(matrix)` on 21the TextureView. 223. Implement a [`CameraDevice.StateCallback`][4] to receive events about changes of the state of the 23camera device. Override its methods to set your CameraDevice instance, start the preview, and stop 24and release the camera. 254. When starting the preview, set up the MediaRecorder to accept video format. 265. Then, set up a [`CaptureRequest.Builder`][5] using `createCaptureRequest(CameraDevice.TEMPLATE_RECORD)` 27on your CameraDevice instance. 286. Then, implement a [`CameraCaptureSession.StateCallback`][6], using the method 29`createCaptureSession(surfaces, new CameraCaptureSession.StateCallback(){})` on your CameraDevice instance, 30where `surfaces` is a list consisting of the surface view of your TextureView and the surface of 31your MediaRecorder instance. 327. Use `start()` and `stop()` methods on your MediaRecorder instance to actually start and stop the recording. 338. Lastly, set up and clean up your camera device in `onResume()` and `onPause()`. 34 35 36[1]: https://developer.android.com/reference/android/hardware/camera2/CameraDevice.html 37[2]: http://developer.android.com/reference/android/hardware/camera2/CameraCaptureSession.html 38[3]: http://developer.android.com/reference/android/view/TextureView.html 39[4]: https://developer.android.com/reference/android/hardware/camera2/CameraDevice.StateCallback.html 40[5]: http://developer.android.com/reference/android/hardware/camera2/CaptureRequest.Builder.html 41[6]: http://developer.android.com/reference/android/hardware/camera2/CameraCaptureSession.StateCallback.html 42 43Pre-requisites 44-------------- 45 46- Android SDK 27 47- Android Support Repository 48 49Screenshots 50------------- 51 52<img src="screenshots/1-launch.png" height="400" alt="Screenshot"/> 53<img src="screenshots/2-record.png" height="400" alt="Screenshot"/> 54<img src="screenshots/3-save.png" height="400" alt="Screenshot"/> 55 56Getting Started 57--------------- 58 59This sample uses the Gradle build system. To build this project, use the 60"gradlew build" command or use "Import Project" in Android Studio. 61 62Support 63------- 64 65- Google+ Community: https://plus.google.com/communities/105153134372062985968 66- Stack Overflow: http://stackoverflow.com/questions/tagged/android 67 68If you've found an error in this sample, please file an issue: 69https://github.com/googlesamples/android-Camera2Video 70 71Patches are encouraged, and may be submitted by forking this project and 72submitting a pull request through GitHub. Please see CONTRIBUTING.md for more details. 73 74License 75------- 76 77Copyright 2018 The Android Open Source Project, Inc. 78 79Licensed to the Apache Software Foundation (ASF) under one or more contributor 80license agreements. See the NOTICE file distributed with this work for 81additional information regarding copyright ownership. The ASF licenses this 82file to you under the Apache License, Version 2.0 (the "License"); you may not 83use this file except in compliance with the License. You may obtain a copy of 84the License at 85 86http://www.apache.org/licenses/LICENSE-2.0 87 88Unless required by applicable law or agreed to in writing, software 89distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 90WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the 91License for the specific language governing permissions and limitations under 92the License. 93
