Android监听UVC插拔


背景

  • Platform: RK3399
  • OS: Android7.1.2
  • Kernel: v4.4.103

之前调试UVC,需监听UVC的插拔状态

处理

以下方式已在Android7.1.2上验证

/*获取USB设备*/
private UsbDevice getUsbCameraDevice(Context context) {
    UsbManager usbManager = (UsbManager)context.getSystemService(Context.USB_SERVICE);
    for(UsbDevice usbDevice : usbManager.getDeviceList().values()) {

        Log.i("camera","\n"+usbDevice.toString());
        if (isUsbCamera(usbDevice)) {
            return usbDevice;
        }
    }
    return null;
}
	
/*判断是否为UVC*/
private boolean isUsbCamera(UsbDevice usbDevice) {
    return usbDevice != null && 239 == usbDevice.getDeviceClass() && 2 == usbDevice.getDeviceSubclass();
}
	
/*广播接收类*/
private class USBReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        // 这里可以拿到插入的USB设备对象
        UsbDevice usbDevice = intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
        switch (intent.getAction()) {
            case UsbManager.ACTION_USB_DEVICE_ATTACHED: // 插入USB设备
                Log.i("camera","USB: 插入");
                //if(getUsbCameraDevice(context) != null){
                if (isUsbCamera(usbDevice)) {
                    new Handler().postDelayed(new Runnable(){
                        public void run() {
                            if(getCameraNumAndView() > 1) {
                                try {
                                    changeCamera(TWO);
                                } catch (IOException e) {
                                    e.printStackTrace();
                                }
                            }
                        }
                    }, 2000);
                }
                break;
            case UsbManager.ACTION_USB_DEVICE_DETACHED: // 拔出USB设备
                Log.i("camera","USB: 拔出");
                new Handler().postDelayed(new Runnable(){
                    public void run() {
                        if(getCameraNumAndView() > 0){
                            try {
                                changeCamera(ONE);
                            } catch (IOException e) {
                                e.printStackTrace();
                            }
                        }
                    }
                }, 500);

                break;
            default:
                break;
        }
    }
}

/*注册USB监听广播*/
private void registerReceiver() {
    IntentFilter filter = new IntentFilter();
    filter.addAction(UsbManager.ACTION_USB_DEVICE_ATTACHED);
    filter.addAction(UsbManager.ACTION_USB_DEVICE_DETACHED);
    mUsbReceiver = new USBReceiver();
    registerReceiver(mUsbReceiver, filter);
}
	
/*注销广播*/
private void unregisterUsbReceiver(){
    unregisterReceiver(mUsbReceiver);
}
	

参考

https://blog.csdn.net/u011630465/article/details/86525857


文章作者: Shell
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