| /* |
| * Copyright 2015 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 com.example.android.common.logger.Log; |
| import com.example.android.system.runtimepermissions.R; |
| |
| import android.hardware.Camera; |
| import android.os.Bundle; |
| import android.support.v4.app.Fragment; |
| import android.view.LayoutInflater; |
| import android.view.View; |
| import android.view.ViewGroup; |
| import android.widget.FrameLayout; |
| import android.widget.Toast; |
| |
| /** |
| * Displays a {@link CameraPreview} of the first {@link Camera}. |
| * An error message is displayed if the Camera is not available. |
| * <p> |
| * 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. |
| * <p> |
| * Implementation is based directly on the documentation at |
| * http://developer.android.com/guide/topics/media/camera.html |
| */ |
| public class CameraPreviewFragment extends Fragment { |
| |
| private static final String TAG = "CameraPreview"; |
| |
| /** |
| * Id of the camera to access. 0 is the first camera. |
| */ |
| private static final int CAMERA_ID = 0; |
| |
| private CameraPreview mPreview; |
| private Camera mCamera; |
| |
| public static CameraPreviewFragment newInstance() { |
| return new CameraPreviewFragment(); |
| } |
| |
| @Override |
| public View onCreateView(LayoutInflater inflater, ViewGroup container, |
| Bundle savedInstanceState) { |
| |
| // Open an instance of the first camera and retrieve its info. |
| mCamera = getCameraInstance(CAMERA_ID); |
| Camera.CameraInfo cameraInfo = new Camera.CameraInfo(); |
| Camera.getCameraInfo(CAMERA_ID, cameraInfo); |
| |
| if (mCamera == null || cameraInfo == null) { |
| // Camera is not available, display error message |
| Toast.makeText(getActivity(), "Camera is not available.", Toast.LENGTH_SHORT).show(); |
| return inflater.inflate(R.layout.fragment_camera_unavailable, null); |
| } |
| |
| View root = inflater.inflate(R.layout.fragment_camera, null); |
| |
| // Get the rotation of the screen to adjust the preview image accordingly. |
| final int displayRotation = getActivity().getWindowManager().getDefaultDisplay() |
| .getRotation(); |
| |
| // Create the Preview view and set it as the content of this Activity. |
| mPreview = new CameraPreview(getActivity(), mCamera, cameraInfo, displayRotation); |
| FrameLayout preview = (FrameLayout) root.findViewById(R.id.camera_preview); |
| preview.addView(mPreview); |
| |
| return root; |
| } |
| |
| @Override |
| public void onPause() { |
| super.onPause(); |
| // Stop camera access |
| releaseCamera(); |
| } |
| |
| /** A safe way to get an instance of the Camera object. */ |
| public static Camera getCameraInstance(int cameraId) { |
| Camera c = null; |
| try { |
| c = Camera.open(cameraId); // attempt to get a Camera instance |
| } catch (Exception e) { |
| // Camera is not available (in use or does not exist) |
| Log.d(TAG, "Camera " + cameraId + " is not available: " + e.getMessage()); |
| } |
| return c; // returns null if camera is unavailable |
| } |
| |
| private void releaseCamera() { |
| if (mCamera != null) { |
| mCamera.release(); // release the camera for other applications |
| mCamera = null; |
| } |
| } |
| } |