AndroidUSBCamera基于saki4510t/UVCCamera开发，该项目对USB Camera(UVC设备)的使用和视频数据采集进行了高度封装，能够帮助开发者通过几个简单的API实现USB Camera设备的检测、连接、预览和音视频数据采集，最重要的是手机无需root，只需支持otg功能即可驱动。主要功能包括：  

如何使用AndroidUSBCamera项目

1.添加依赖到本地工程

allprojects {repositories {...maven { url 'http://raw.github.com/saki4510t/libcommon/master/repository/' }maven { url 'https://jitpack.io' }}}

dependencies { compile 'com.github.jiangdongguo:AndroidUSBCamera:1.3.8'}

2.初始化引擎，注册USB设备事件监听器

    private USBCameraManager.OnMyDevConnectListener listener = new USBCameraManager.OnMyDevConnectListener() {        // 插入USB设备        @Override        public void onAttachDev(UsbDevice device) {            if(mUSBManager == null || mUSBManager.getUsbDeviceCount() == 0){                showShortMsg("未检测到USB摄像头设备");                return;            }            // 请求打开摄像头            if(! isRequest){                isRequest = true;                if(mUSBManager != null){                    mUSBManager.requestPermission(0);                }            }        }        // 拔出USB设备        @Override        public void onDettachDev(UsbDevice device) {            if(isRequest){                // 关闭摄像头                isRequest = false;                mUSBManager.closeCamera();                showShortMsg(device.getDeviceName()+"已拨出");            }        }        // 连接USB设备成功        @Override        public void onConnectDev(UsbDevice device,boolean isConnected) {            if(! isConnected) {                showShortMsg("连接失败，请检查分辨率参数是否正确");                isPreview = false;            }else{                isPreview = true;            }        }        // 与USB设备断开连接        @Override        public void onDisConnectDev(UsbDevice device) {            showShortMsg("连接失败");        }    };        mUVCCameraView = (CameraViewInterface) mTextureView;    mUVCCameraView.setCallback(new CameraViewInterface.Callback() {        @Override        public void onSurfaceCreated(CameraViewInterface view, Surface surface) {            if(!isPreview && mUSBManager.isCameraOpened()) {                 mUSBManager.startPreview(mUVCCameraView, new AbstractUVCCameraHandler.OnPreViewResultListener() {                 @Override                 public void onPreviewResult(boolean result) {                 }              });              isPreview = true;              }         }            @Override            public void onSurfaceChanged(CameraViewInterface view, Surface surface, int width, int height) {            }            @Override            public void onSurfaceDestroy(CameraViewInterface view, Surface surface) {                if(isPreview && mUSBManager.isCameraOpened()) {                    mUSBManager.stopPreview();                    isPreview = false;                }            }        });        // 初始化引擎        mUSBManager = USBCameraManager.getInstance();        mUSBManager.initUSBMonitor(this,listener);        mUSBManager.createUVCCamera(mUVCCameraView);

3. 注册USB设备广播事件监听器，开始Camera预览

// 注册USB事件广播监听器if(mUSBManager != null){      mUSBManager.registerUSB();}// 恢复Camera预览 if(mUVCCameraView != null){      mUVCCameraView.onResume(); }

4. 注销USB设备广播事件监听器，停止Camera预览

// 注销USB事件广播监听器 if(mUSBManager != null){         mUSBManager.unregisterUSB();  } // 暂停Camera预览 if(mUVCCameraView != null){         mUVCCameraView.onPause(); }

5. 图片抓拍

if(mUSBManager == null || ! mUSBManager.isCameraOpened()){          showShortMsg("抓拍异常，摄像头未开启");          return; } mUSBManager.capturePicture(picPath, new AbstractUVCCameraHandler.OnCaptureListener() {          @Override          public void onCaptureResult(String path) {               showShortMsg("保存路径："+path);          } });

6. 本地录制(可实时获取音视频数据流)

 if(mUSBManager == null || ! mUSBManager.isCameraOpened()){           showShortMsg("录制异常，摄像头未开启");           return; }if(! mUSBManager.isRecording()){                    String videoPath = USBCameraManager.ROOT_PATH+System.currentTimeMillis();                    FileUtils.createfile(FileUtils.ROOT_PATH+"test666.h264");                    RecordParams params = new RecordParams();                    params.setRecordPath(videoPath);                    params.setRecordDuration(0);    // 设置为0，不分割保存                    params.setVoiceClose(false);    // 不屏蔽声音                    mUSBManager.startRecording(params, new AbstractUVCCameraHandler.OnEncodeResultListener() {                        @Override                        public void onEncodeResult(byte[] data, int offset, int length, long timestamp, int type) {                            // type = 0,aac格式音频流                            // type = 1,h264格式视频流                            if(type == 1){                                FileUtils.putFileStream(data,offset,length);                            }                        }                        @Override                        public void onRecordResult(String videoPath) {                            showShortMsg(videoPath);                        }                    });// 停止录制mUSBManager.stopRecording();

7. 切换分辨率

mUSBManager.updateResolution(this, mUVCCameraView, 320, 240, new USBCameraManager.OnPreviewListener() {             @Override             public void onPreviewResult(boolean isSuccess) {                    if(! isSuccess) {                            showShortMsg("预览失败，不支持该分辨率");                        }else {                            showShortMsg("以切换到分辨率为320x240");                        }                    }      });   // 获取Camera支持得分辨率   List<Size> list = mUSBManager.getSupportedPreviewSizes(); // Camera自动对焦   mUSBManager.startCameraFoucs();

8. 释放引擎资源

// 释放资源if(mUSBManager != null){       mUSBManager.release(); }

9. 添加权限

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /><uses-permission android:name="android.permission.RECORD_AUDIO" />

USBCameraManager API (Other)

(1) void requestPermission(int index)：请求授予开启USB摄像头权限；(2) int getUsbDeviceCount()：返回查询到的可用USB Camera数目；(3) boolean isRecording()：判断是否正在录制视频；(4) boolean isCameraOpened()：判断USB摄像头是否正常打开；(5) void release()：释放资源(6) USBMonitor getUSBMonitor()：返回USBMonitor实例；(7) mUSBManager.setModelValue(USBCameraManager.MODE_CONTRAST,contrast++); 调整对比度(8) mUSBManager.setModelValue(USBCameraManager.MODE_BRIGHTNESS,brightness++);调整亮度