CameraValidator.java
/*
* Copyright 2020 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.impl;
import android.content.Context;
import android.content.pm.PackageManager;
import android.os.Build;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.camera.core.CameraSelector;
import androidx.camera.core.Logger;
/**
* Validation methods to verify the camera is initialized successfully.
*/
public final class CameraValidator {
private CameraValidator() {
}
private static final String TAG = "CameraValidator";
/**
* Verifies the initialized camera instance in the CameraRepository
*
* <p>It should initialize the cameras that physically supported on the device. The
* physically supported device lens facing information comes from the package manager and the
* system feature flags are set by the vendor as part of the device build and CTS verified.
*
* @param context The application or activity context.
* @param cameraRepository The camera repository for verify.
* @throws CameraIdListIncorrectException if it fails to find all the camera instances that
* physically supported on the device.
*/
public static void validateCameras(@NonNull Context context,
@NonNull CameraRepository cameraRepository) throws CameraIdListIncorrectException {
PackageManager pm = context.getPackageManager();
Logger.d(TAG, "Verifying camera lens facing on " + Build.DEVICE);
try {
if (pm.hasSystemFeature(PackageManager.FEATURE_CAMERA)) {
CameraSelector.DEFAULT_BACK_CAMERA.select(cameraRepository.getCameras());
}
if (pm.hasSystemFeature(PackageManager.FEATURE_CAMERA_FRONT)) {
CameraSelector.DEFAULT_FRONT_CAMERA.select(cameraRepository.getCameras());
}
} catch (IllegalArgumentException e) {
Logger.e(TAG, "Camera LensFacing verification failed, existing cameras: "
+ cameraRepository.getCameras());
throw new CameraIdListIncorrectException("Expected camera missing from device.", e);
}
}
/** The exception for the b/167201193: incorrect camera id list. */
public static class CameraIdListIncorrectException extends Exception {
public CameraIdListIncorrectException(@Nullable String message, @Nullable Throwable cause) {
super(message, cause);
}
}
}