Camera2基本应用google官方demo

Android Camera2Basic Sample (Kotlin) ==================================== This sample demonstrates how to use basic functionalities of Camera2 API. You can learn how to iterate through characteristics of all the cameras attached to the device, display a camera preview, and take pictures. Introduction ------------ The [Camera2 API][1] provides an interface to individual camera devices connected to an Android device. It replaces the deprecated Camera class. Use [getCameraIdList][2] to get a list of all the available cameras. You can then use [getCameraCharacteristics][3] and find the best camera that suits your need (front/rear facing, resolution etc). Create an instance of [CameraDevice.StateCallback][4] and open a camera. It is ready to start camera preview when the camera is opened. This sample uses TextureView to show the camera preview. Create a [CameraCaptureSession][5] and set a repeating [CaptureRequest][6] to it. Still image capture takes several steps. First, you need to lock the focus of the camera by updating the CaptureRequest for the camera preview. Then, in a similar way, you need to run a precapture sequence. After that, it is ready to capture a picture. Create a new CaptureRequest and call [capture][7]. Don't forget to unlock the focus when you are done. [1]: https://developer.android.com/reference/android/hardware/camera2/package-summary.html [2]: https://developer.android.com/reference/android/hardware/camera2/CameraManager.html#getCameraIdList() [3]: https://developer.android.com/reference/android/hardware/camera2/CameraManager.html#getCameraCharacteristics(java.lang.String) [4]: https://developer.android.com/reference/android/hardware/camera2/CameraDevice.StateCallback.html [5]: https://developer.android.com/reference/android/hardware/camera2/CameraCaptureSession.html [6]: https://developer.android.com/reference/android/hardware/camera2/CaptureRequest.html [7]: https://developer.android.com/reference/android/hardware/camera2/CameraCaptureSession.html#capture(android.hardware.camera2.CaptureRequest, android.hardware.camera2.CameraCaptureSession.CaptureCallback, android.os.Handler) Pre-requisites -------------- - Android SDK 25 - Android Build Tools v25.0.3 - Android Support Repository Screenshots ------------- <img src="screenshots/main.png" height="400" alt="Screenshot"/> Getting Started --------------- This sample uses the Gradle build system. To build this project, use the "gradlew build" command or use "Import Project" in Android Studio. Support ------- - Google+ Community: https://plus.google.com/communities/105153134372062985968 - Stack Overflow: http://stackoverflow.com/questions/tagged/android If you've found an error in this sample, please file an issue: https://github.com/googlesamples/android-Camera2Basic Patches are encouraged, and may be submitted by forking this project and submitting a pull request through GitHub. Please see CONTRIBUTING.md for more details. License ------- Copyright 2017 The Android Open Source Project, Inc. Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.