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.NonNull;
import androidx.annotation.RequiresApi;
import androidx.annotation.RequiresPermission;
import androidx.camera.core.impl.utils.MainThreadAsyncHandler;
import androidx.core.util.Preconditions;

import java.util.concurrent.Executor;

@RequiresApi(21)
class CameraManagerCompatBaseImpl implements CameraManagerCompat.CameraManagerCompatImpl {

    final CameraManager mCameraManager;

    CameraManagerCompatBaseImpl(@NonNull Context context) {
        mCameraManager = (CameraManager) context.getSystemService(Context.CAMERA_SERVICE);
    }

    @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;
    }
}