/*
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* Copyright (C) 2012 ZXing authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.tejia.lijin.app.util.zxing.camera;
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import android.annotation.SuppressLint;
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import android.hardware.Camera;
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import android.util.Log;
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public final class OpenCameraInterface {
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private static final String TAG = OpenCameraInterface.class.getName();
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private OpenCameraInterface() {
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}
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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 "no preference"
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* @return handle to {@link Camera} that was opened
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*/
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@SuppressLint("NewApi")
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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, 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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