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();
}
}