89 lines
3.7 KiB
Markdown
89 lines
3.7 KiB
Markdown
Android Camera2Basic Sample (Kotlin)
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====================================
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This sample demonstrates how to use basic functionalities of Camera2
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API. You can learn how to iterate through characteristics of all the
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cameras attached to the device, display a camera preview, and take
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pictures.
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Introduction
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------------
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The [Camera2 API][1] provides an interface to individual camera
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devices connected to an Android device. It replaces the deprecated
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Camera class.
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Use [getCameraIdList][2] to get a list of all the available
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cameras. You can then use [getCameraCharacteristics][3] and find the
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best camera that suits your need (front/rear facing, resolution etc).
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Create an instance of [CameraDevice.StateCallback][4] and open a
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camera. It is ready to start camera preview when the camera is opened.
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This sample uses TextureView to show the camera preview. Create a
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[CameraCaptureSession][5] and set a repeating [CaptureRequest][6] to it.
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Still image capture takes several steps. First, you need to lock the
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focus of the camera by updating the CaptureRequest for the camera
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preview. Then, in a similar way, you need to run a precapture
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sequence. After that, it is ready to capture a picture. Create a new
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CaptureRequest and call [capture][7]. Don't forget to unlock the focus
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when you are done.
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[1]: https://developer.android.com/reference/android/hardware/camera2/package-summary.html
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[2]: https://developer.android.com/reference/android/hardware/camera2/CameraManager.html#getCameraIdList()
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[3]: https://developer.android.com/reference/android/hardware/camera2/CameraManager.html#getCameraCharacteristics(java.lang.String)
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[4]: https://developer.android.com/reference/android/hardware/camera2/CameraDevice.StateCallback.html
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[5]: https://developer.android.com/reference/android/hardware/camera2/CameraCaptureSession.html
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[6]: https://developer.android.com/reference/android/hardware/camera2/CaptureRequest.html
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[7]: https://developer.android.com/reference/android/hardware/camera2/CameraCaptureSession.html#capture(android.hardware.camera2.CaptureRequest, android.hardware.camera2.CameraCaptureSession.CaptureCallback, android.os.Handler)
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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/main.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-Camera2Basic
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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 2017 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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