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CameraPreviewFragment.kt
/* * Copyright 2017 The Android Open Source Project * * Licensed 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. */ package com.example.android.system.runtimepermissions.camera import android.hardware.Camera import android.os.Bundle import android.support.design.widget.Snackbar import android.support.v4.app.Fragment import android.view.LayoutInflater import android.view.View import android.view.ViewGroup import com.example.android.system.runtimepermissions.R import kotlinx.android.synthetic.main.fragment_camera.* /** * Displays a [CameraPreview] of the first [Camera]. * An error message is displayed if the Camera is not available. * * * This Fragment is only used to illustrate that access to the Camera API has been granted (or * denied) as part of the runtime permissions model. It is not relevant for the use of the * permissions API. * * * Implementation is based directly on the documentation at * http://developer.android.com/guide/topics/media/camera.html */ class CameraPreviewFragment : Fragment() { private lateinit var preview: CameraPreview private var camera: Camera? = null override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View { // Open an instance of the first camera and retrieve its info. camera = Camera.open(CAMERA_ID) val cameraInfo: Camera.CameraInfo = Camera.CameraInfo() if (camera != null) { // Get camera info only if the camera is available Camera.getCameraInfo(CAMERA_ID, cameraInfo) } val root: View if (camera == null) { // Camera is not available, display error message root = inflater.inflate(R.layout.fragment_camera_unavailable, container, false) Snackbar.make(root, "Camera is not available.", Snackbar.LENGTH_SHORT).show() } else { root = inflater.inflate(R.layout.fragment_camera, container, false) // Get the rotation of the screen to adjust the preview image accordingly. val displayRotation = activity.windowManager.defaultDisplay.rotation // Create the Preview view and set it as the content of this Activity. preview = CameraPreview(activity, camera, cameraInfo, displayRotation) cameraPreview.addView(preview) } return root } override fun onPause() { super.onPause() // Stop camera access releaseCamera() } private fun releaseCamera() { camera?.release() // release the camera for other applications. camera = null } companion object { /** * Id of the camera to access. 0 is the first camera. */ private const val CAMERA_ID = 0 fun newInstance() = CameraPreviewFragment() } }