package com.zxing.camera.open;
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import android.hardware.Camera;
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import android.util.Log;
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public class OpenCameraInterface {
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private static final String TAG = OpenCameraInterface.class.getName();
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/**
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* Opens the requested camera with {@link Camera#open(int)}, if one exists.
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*
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* @param cameraId camera ID of the camera to use. A negative value means
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* "no preference"
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* @return handle to {@link Camera} that was opened
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*/
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public static Camera open(int cameraId) {
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int numCameras = Camera.getNumberOfCameras();
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if (numCameras == 0) {
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Log.w(TAG, "No cameras!");
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return null;
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}
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boolean explicitRequest = cameraId >= 0;
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if (!explicitRequest) {
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// Select a camera if no explicit camera requested
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int index = 0;
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while (index < numCameras) {
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Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
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Camera.getCameraInfo(index, cameraInfo);
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if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_BACK) {
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break;
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}
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index++;
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}
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cameraId = index;
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}
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Camera camera;
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if (cameraId < numCameras) {
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Log.i(TAG, "Opening camera #" + cameraId);
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camera = Camera.open(cameraId);
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} else {
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if (explicitRequest) {
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Log.w(TAG, "Requested camera does not exist: " + cameraId);
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camera = null;
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} else {
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Log.i(TAG, "No camera facing back; returning camera #0");
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camera = Camera.open(0);
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}
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}
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return camera;
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}
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/**
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* Opens a rear-facing camera with {@link Camera#open(int)}, if one exists,
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* or opens camera 0.
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*
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* @return handle to {@link Camera} that was opened
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*/
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public static Camera open() {
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return open(-1);
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}
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}
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