| /* |
| * Copyright 2021 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 androidx.camera.core; |
| |
| import androidx.annotation.NonNull; |
| import androidx.annotation.RequiresApi; |
| |
| import java.util.List; |
| |
| /** |
| * A {@link CameraProvider} provides basic access to a set of cameras such as querying for camera |
| * existence or information. |
| * |
| * <p>A device might have multiple cameras. According to the applications' design, they might |
| * need to search for a suitable camera which supports their functions. A {@link CameraProvider} |
| * allows the applications to check whether any camera exists to fulfill the requirements or to |
| * get {@link CameraInfo} instances of all cameras to retrieve the camera information. |
| */ |
| @RequiresApi(21) // TODO(b/200306659): Remove and replace with annotation on package-info.java |
| public interface CameraProvider { |
| |
| /** |
| * Checks whether this provider supports at least one camera that meets the requirements from a |
| * {@link CameraSelector}. |
| * |
| * <p>If this method returns {@code true}, then the camera selector can be used to bind |
| * use cases and retrieve a {@link Camera} instance. |
| * |
| * @param cameraSelector the {@link CameraSelector} that filters available cameras. |
| * @return true if the device has at least one available camera, otherwise false. |
| * @throws CameraInfoUnavailableException if unable to access cameras, perhaps due to |
| * insufficient permissions. |
| */ |
| boolean hasCamera(@NonNull CameraSelector cameraSelector) throws CameraInfoUnavailableException; |
| |
| /** |
| * Returns {@link CameraInfo} instances of the available cameras. |
| * |
| * <p>While iterating through all the available {@link CameraInfo}, if one of them meets some |
| * predefined requirements, a {@link CameraSelector} that uniquely identifies its camera |
| * can be retrieved using {@link CameraInfo#getCameraSelector()}, which can then be used to bind |
| * {@linkplain UseCase use cases} to that camera. |
| * |
| * @return A list of {@link CameraInfo} instances for the available cameras. |
| */ |
| @NonNull |
| List<CameraInfo> getAvailableCameraInfos(); |
| } |