Android Open Source - qrcode-android Gingerbread Open Camera Interface

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License

The source code is released under:

MIT License

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Java Source Code

/*
 * Copyright (C) 2012 ZXing authors/*  ww w .  jav a  2s  .com*/
 *
 * 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.google.zxing.client.android.camera.open;

import android.annotation.TargetApi;
import android.hardware.Camera;
import android.util.Log;

/**
 * Implementation for Android API 9 (Gingerbread) and later. This opens up the possibility of accessing
 * front cameras, and rotated cameras.
 */
@TargetApi(9)
public final class GingerbreadOpenCameraInterface implements OpenCameraInterface
{

    private static final String TAG = "GingerbreadOpenCamera";

    /**
     * Opens a rear-facing camera with {@link Camera#open(int)}, if one exists, or opens camera 0.
     */
    @Override
    public Camera open()
    {

        int numCameras = Camera.getNumberOfCameras();
        if (numCameras == 0)
        {
            Log.w(TAG, "No cameras!");
            return null;
        }

        int index = 0;
        while (index < numCameras)
        {
            Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
            Camera.getCameraInfo(index, cameraInfo);
            if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_BACK)
            {
                break;
            }
            index++;
        }

        Camera camera;
        if (index < numCameras)
        {
            Log.i(TAG, "Opening camera #" + index);
            camera = Camera.open(index);
        } else
        {
            Log.i(TAG, "No camera facing back; returning camera #0");
            camera = Camera.open(0);
        }

        return camera;
    }

}

Java Source Code List