CameraManagerCompatBaseImpl.java
/*
* Copyright 2019 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.camera2.impl.compat;
import android.content.Context;
import android.hardware.camera2.CameraAccessException;
import android.hardware.camera2.CameraDevice;
import android.hardware.camera2.CameraManager;
import androidx.annotation.GuardedBy;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.annotation.RequiresApi;
import androidx.annotation.RequiresPermission;
import androidx.camera.core.impl.utils.MainThreadAsyncHandler;
import androidx.core.util.Preconditions;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.Executor;
@RequiresApi(21)
class CameraManagerCompatBaseImpl implements CameraManagerCompat.CameraManagerCompatImpl {
final CameraManager mCameraManager;
final Object mObject;
CameraManagerCompatBaseImpl(@NonNull Context context, @Nullable Object cameraManagerParams) {
mCameraManager = (CameraManager) context.getSystemService(Context.CAMERA_SERVICE);
mObject = cameraManagerParams;
}
CameraManagerCompatBaseImpl(@NonNull Context context) {
mCameraManager = (CameraManager) context.getSystemService(Context.CAMERA_SERVICE);
mObject = new CameraManagerCompatParamsApi21();
}
@Override
public void registerAvailabilityCallback(@NonNull Executor executor,
@NonNull CameraManager.AvailabilityCallback callback) {
if (executor == null) {
throw new IllegalArgumentException("executor was null");
}
CameraManagerCompat.AvailabilityCallbackExecutorWrapper wrapper = null;
if (callback != null) {
CameraManagerCompatParamsApi21 params = (CameraManagerCompatParamsApi21) mObject;
synchronized (params.mWrapperMap) {
wrapper = params.mWrapperMap.get(callback);
if (wrapper == null) {
wrapper = new CameraManagerCompat.AvailabilityCallbackExecutorWrapper(executor,
callback);
params.mWrapperMap.put(callback, wrapper);
}
}
}
mCameraManager.registerAvailabilityCallback(wrapper, MainThreadAsyncHandler.getInstance());
}
@Override
public void unregisterAvailabilityCallback(
@NonNull CameraManager.AvailabilityCallback callback) {
CameraManagerCompat.AvailabilityCallbackExecutorWrapper wrapper = null;
if (callback != null) {
CameraManagerCompatParamsApi21 params = (CameraManagerCompatParamsApi21) mObject;
synchronized (params.mWrapperMap) {
wrapper = params.mWrapperMap.remove(callback);
}
}
mCameraManager.unregisterAvailabilityCallback(wrapper);
}
@RequiresPermission(android.Manifest.permission.CAMERA)
@Override
public void openCamera(@NonNull String cameraId, @NonNull Executor executor,
@NonNull CameraDevice.StateCallback callback) throws CameraAccessException {
Preconditions.checkNotNull(executor);
Preconditions.checkNotNull(callback);
// Wrap the executor in the callback
CameraDevice.StateCallback cb =
new CameraDeviceCompat.StateCallbackExecutorWrapper(executor, callback);
mCameraManager.openCamera(cameraId, cb, MainThreadAsyncHandler.getInstance());
}
@NonNull
@Override
public CameraManager getCameraManager() {
return mCameraManager;
}
static final class CameraManagerCompatParamsApi21 {
@GuardedBy("mWrapperMap")
final Map<CameraManager.AvailabilityCallback,
CameraManagerCompat.AvailabilityCallbackExecutorWrapper>
mWrapperMap = new HashMap<>();
}
}