1.广播检测USB 音频设备

注册广播：

"android.hardware.usb.action.USB_DEVICE_ATTACHED";

"android.hardware.usb.action.USB_DEVICE_DETACHED";

接收广播：

public class MyUsbDeviceReceiver extends BroadcastReceiver {

private static final String TAG = MyUsbDeviceReceiver.class.getSimpleName();

public static final String TAGLISTEN = "android.intent.action.HEADSET_PLUG";

private final static String TAGUSB = "android.hardware.usb.action.USB_STATE";

public static final String TAGIN = "android.hardware.usb.action.USB_DEVICE_ATTACHED";

public static final String TAGOUT = "android.hardware.usb.action.USB_DEVICE_DETACHED";

@Override

public void onReceive(Context context, Intent intent) {

String action = intent.getAction();

if (action.equals(TAGLISTEN)) {

Log.i(TAG, "TAGLISTEN");

} else if (action.equals(TAGUSB)) {

Log.i(TAG, "TAGUSB");

} else if (action.equals(TAGIN)) {

Log.i(TAG, "TAGIN");

UsbDevice device = (UsbDevice) intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);

if (null == device) {

Log.i(TAG, "null usb device");

return;

}

int count = device.getConfigurationCount();

boolean hasAudio = false;

for (int i = 0; i < count; i++) {

UsbConfiguration configuration = device.getConfiguration(i);

if (null == configuration) {

Log.i(TAG, "null usb configuration");

return;

}

int interfaceCount = configuration.getInterfaceCount();

for (int j = 0; j < interfaceCount; j++) {

UsbInterface usbInterface = configuration.getInterface(j);

if (null != usbInterface && usbInterface.getInterfaceClass() == UsbConstants.USB_CLASS_AUDIO) {

hasAudio = true;

}

}

}

Log.i(TAG, "has audio:" + hasAudio);

// your operation here

} else if (action.equals(TAGOUT)) {

Log.i(TAG, "TAGOUT");

UsbDevice device = (UsbDevice) intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);

if (null == device) {

Log.i(TAG, "null usb device");

return;

}

int count = device.getConfigurationCount();

boolean hasAudio = false;

for (int i = 0; i < count; i++) {

UsbConfiguration configuration = device.getConfiguration(i);

if (null == configuration) {

Log.i(TAG, "null usb configuration");

return;

}

int interfaceCount = configuration.getInterfaceCount();

for (int j = 0; j < interfaceCount; j++) {

UsbInterface usbInterface = configuration.getInterface(j);

if (null != usbInterface && usbInterface.getInterfaceClass() == UsbConstants.USB_CLASS_AUDIO) {

hasAudio = true;

}

}

}

// your operation here

}

}

}

USB 设备类型获取请查看UsbInterface.getInterfaceClass()：

/**

* Returns the interface's class field.

* Some useful constants for USB classes can be found in {@link UsbConstants}

*

* @return the interface's class

*/

public int getInterfaceClass() {

return mClass;

}

USB 设备类型定义请查看UsbConstants.java:

/**

* USB class indicating that the class is determined on a per-interface basis.

*/

public static final int USB_CLASS_PER_INTERFACE = 0;

/**

* USB class for audio devices.

*/

public static final int USB_CLASS_AUDIO = 1;

/**

* USB class for communication devices.

*/

public static final int USB_CLASS_COMM = 2;

/**

* USB class for human interface devices (for example, mice and keyboards).

*/

public static final int USB_CLASS_HID = 3;

/**

* USB class for physical devices.

*/

public static final int USB_CLASS_PHYSICA = 5;

/**

* USB class for still image devices (digital cameras).

*/

public static final int USB_CLASS_STILL_IMAGE = 6;

/**

* USB class for printers.

*/

public static final int USB_CLASS_PRINTER = 7;

/**

* USB class for mass storage devices.

*/

public static final int USB_CLASS_MASS_STORAGE = 8;

/**

* USB class for USB hubs.

*/

public static final int USB_CLASS_HUB = 9;

/**

* USB class for CDC devices (communications device class).

*/

public static final int USB_CLASS_CDC_DATA = 0x0a;

/**

* USB class for content smart card devices.

*/

public static final int USB_CLASS_CSCID = 0x0b;

/**

* USB class for content security devices.

*/

public static final int USB_CLASS_CONTENT_SEC = 0x0d;

/**

* USB class for video devices.

*/

public static final int USB_CLASS_VIDEO = 0x0e;

/**

* USB class for wireless controller devices.

*/

public static final int USB_CLASS_WIRELESS_CONTROLLER = 0xe0;

/**

* USB class for wireless miscellaneous devices.

*/

public static final int USB_CLASS_MISC = 0xef;

/**

* Application specific USB class.

*/

public static final int USB_CLASS_APP_SPEC = 0xfe;

/**

* Vendor specific USB class.

*/

public static final int USB_CLASS_VENDOR_SPEC = 0xff;

2.UsbManager检测

原理大同小异，都是获取到UsbDevice,然后解析。

private boolean detectUsbAudioDevice() {

HashMap deviceHashMap = ((UsbManager) getSystemService(USB_SERVICE)).getDeviceList();

for (Map.Entry entry : deviceHashMap.entrySet()) {

UsbDevice device = (UsbDevice) entry.getValue();

if (null != device) {

for (int i = 0; i < device.getConfigurationCount(); i++) {

UsbConfiguration configuration = device.getConfiguration(i);

if (null != configuration) {

for (int j = 0; j < configuration.getInterfaceCount(); j++) {

UsbInterface usbInterface = configuration.getInterface(j);

if (null != usbInterface) {

if (UsbConstants.USB_CLASS_AUDIO == usbInterface.getInterfaceClass()) {

Log.i(TAG, "has usb audio device");

return true;

}

}

}

}

}

}

}

Log.i(TAG, "have no usb audio device");

return false;

}

3.Linux命令检测

节点：

/proc/bus/input/devices或者/proc/asound/cards，用cat命令获取。

前一个是根据usb输入设备来判断，后一个是根据声卡来获取。

获取具体信息要根除命令输出情况来自行解析，以前一个节点为例：

private void detectInputDeviceWithShell() {

try {

//获得外接USB输入设备的信息

Process p = Runtime.getRuntime().exec("cat /proc/bus/input/devices");

BufferedReader in = new BufferedReader(new InputStreamReader(p.getInputStream()));

String line = null;

while ((line = in.readLine()) != null) {

String deviceInfo = line.trim();

//对获取的每行的设备信息进行过滤，获得自己想要的。

if (deviceInfo.contains("Name="))

Log.d(TAG, "detectInputDeviceWithShell: " + deviceInfo);

}

Log.d(TAG, "-----------------------");

} catch (Exception e) {

e.printStackTrace();

}

}