监听USB设备插拔_使用libuvccamera包_usbmonitor.ondeviceconnectlistener-优快云博客

本文详细介绍了如何在AndroidStudio中利用libuvccamera库实现USB摄像头的功能。步骤包括导入libuvccamera包、声明并注册USBMonitor、实现设备连接与断开的监听回调等关键环节。

使用android studio

1、导入libuvccamera包。

2、声明变量，private USBMonitor mUSBMonitor;

3、在onStart中注册，mUSBMonitor.register();

4、在onStop中反注册，mUSBMonitor.unregister();

5、在onDestroy中销毁，

if (mUSBMonitor != null) {
   mUSBMonitor.destroy();
   mUSBMonitor = null;
}

6、生成对象：

mUSBMonitor = new USBMonitor(this, mOnDeviceConnectListener);

7、写监听回调：

private final USBMonitor.OnDeviceConnectListener mOnDeviceConnectListener = new USBMonitor.OnDeviceConnectListener() {
        @Override
        public void onAttach(final UsbDevice device) {
            Log.v(TAG, "onAttach:");
            mUSBMonitor.requestPermission(device);

            mHandler.sendEmptyMessage(USB_CONNECT);
        }

        @Override
        public void onConnect(final UsbDevice device, final USBMonitor.UsbControlBlock ctrlBlock, final boolean createNew) {
            Log.v(TAG, "onConnect:");
            // openCameraDevice(device, ctrlBlock);
            CameraResStruct crs = new CameraResStruct();
            crs.setCtrlBlock(ctrlBlock);
            usbMap.put(device, crs);
        }

        @Override
        public void onDisconnect(final UsbDevice device, final USBMonitor.UsbControlBlock ctrlBlock) {
            Log.v(TAG, "onDisconnect:");

            mHandler.sendEmptyMessage(USB_DISCONNECT);
        }

        @Override
        public void onDettach(final UsbDevice device) {
            Log.v(TAG, "onDettach:");
        }

        @Override
        public void onCancel(final UsbDevice device) {
            Log.v(TAG, "onCancel:");
        }
    };