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README.md

1
2Android Camera2Video Sample
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 Build Tools v27.0.2
48- Android Support Repository
49
50Screenshots
51-------------
52
53<img src="screenshots/1-launch.png" height="400" alt="Screenshot"/> <img src="screenshots/2-record.png" height="400" alt="Screenshot"/> <img src="screenshots/3-save.png" height="400" alt="Screenshot"/>
54
55Getting Started
56---------------
57
58This sample uses the Gradle build system. To build this project, use the
59"gradlew build" command or use "Import Project" in Android Studio.
60
61Support
62-------
63
64- Google+ Community: https://plus.google.com/communities/105153134372062985968
65- Stack Overflow: http://stackoverflow.com/questions/tagged/android
66
67If you've found an error in this sample, please file an issue:
68https://github.com/googlesamples/android-Camera2Video
69
70Patches are encouraged, and may be submitted by forking this project and
71submitting a pull request through GitHub. Please see CONTRIBUTING.md for more details.
72
73License
74-------
75
76Copyright 2017 The Android Open Source Project, Inc.
77
78Licensed to the Apache Software Foundation (ASF) under one or more contributor
79license agreements.  See the NOTICE file distributed with this work for
80additional information regarding copyright ownership.  The ASF licenses this
81file to you under the Apache License, Version 2.0 (the "License"); you may not
82use this file except in compliance with the License.  You may obtain a copy of
83the License at
84
85http://www.apache.org/licenses/LICENSE-2.0
86
87Unless required by applicable law or agreed to in writing, software
88distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
89WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
90License for the specific language governing permissions and limitations under
91the License.
92