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README.md

      1 Android Camera2Basic Sample (Kotlin)
      2 ====================================
      3 
      4 This sample demonstrates how to use basic functionalities of Camera2
      5 API. You can learn how to iterate through characteristics of all the
      6 cameras attached to the device, display a camera preview, and take
      7 pictures.
      8 
      9 Introduction
     10 ------------
     11 
     12 The [Camera2 API][1] provides an interface to individual camera
     13 devices connected to an Android device. It replaces the deprecated
     14 Camera class.
     15 
     16 Use [getCameraIdList][2] to get a list of all the available
     17 cameras. You can then use [getCameraCharacteristics][3] and find the
     18 best camera that suits your need (front/rear facing, resolution etc).
     19 
     20 Create an instance of [CameraDevice.StateCallback][4] and open a
     21 camera. It is ready to start camera preview when the camera is opened.
     22 
     23 This sample uses TextureView to show the camera preview. Create a
     24 [CameraCaptureSession][5] and set a repeating [CaptureRequest][6] to it.
     25 
     26 Still image capture takes several steps. First, you need to lock the
     27 focus of the camera by updating the CaptureRequest for the camera
     28 preview. Then, in a similar way, you need to run a precapture
     29 sequence. After that, it is ready to capture a picture. Create a new
     30 CaptureRequest and call [capture][7]. Don't forget to unlock the focus
     31 when you are done.
     32 
     33 [1]: https://developer.android.com/reference/android/hardware/camera2/package-summary.html
     34 [2]: https://developer.android.com/reference/android/hardware/camera2/CameraManager.html#getCameraIdList()
     35 [3]: https://developer.android.com/reference/android/hardware/camera2/CameraManager.html#getCameraCharacteristics(java.lang.String)
     36 [4]: https://developer.android.com/reference/android/hardware/camera2/CameraDevice.StateCallback.html
     37 [5]: https://developer.android.com/reference/android/hardware/camera2/CameraCaptureSession.html
     38 [6]: https://developer.android.com/reference/android/hardware/camera2/CaptureRequest.html
     39 [7]: https://developer.android.com/reference/android/hardware/camera2/CameraCaptureSession.html#capture(android.hardware.camera2.CaptureRequest, android.hardware.camera2.CameraCaptureSession.CaptureCallback, android.os.Handler)
     40 
     41 Pre-requisites
     42 --------------
     43 
     44 - Android SDK 27
     45 - Android Support Repository
     46 
     47 Screenshots
     48 -------------
     49 
     50 <img src="screenshots/main.png" height="400" alt="Screenshot"/>
     51 
     52 Getting Started
     53 ---------------
     54 
     55 This sample uses the Gradle build system. To build this project, use the
     56 "gradlew build" command or use "Import Project" in Android Studio.
     57 
     58 Support
     59 -------
     60 
     61 - Google+ Community: https://plus.google.com/communities/105153134372062985968
     62 - Stack Overflow: http://stackoverflow.com/questions/tagged/android
     63 
     64 If you've found an error in this sample, please file an issue:
     65 https://github.com/googlesamples/android-Camera2Basic
     66 
     67 Patches are encouraged, and may be submitted by forking this project and
     68 submitting a pull request through GitHub. Please see CONTRIBUTING.md for more details.
     69 
     70 License
     71 -------
     72 
     73 Copyright 2017 The Android Open Source Project, Inc.
     74 
     75 Licensed to the Apache Software Foundation (ASF) under one or more contributor
     76 license agreements.  See the NOTICE file distributed with this work for
     77 additional information regarding copyright ownership.  The ASF licenses this
     78 file to you under the Apache License, Version 2.0 (the "License"); you may not
     79 use this file except in compliance with the License.  You may obtain a copy of
     80 the License at
     81 
     82 http://www.apache.org/licenses/LICENSE-2.0
     83 
     84 Unless required by applicable law or agreed to in writing, software
     85 distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
     86 WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
     87 License for the specific language governing permissions and limitations under
     88 the License.
     89