如何让 Android 在每次重新连接 USB 设备时都不再请求权限？我想让它记住 USB 设备的“默认使用”复选标记，这样我就不必每次都向同一设备授予权限。
我以编程方式检测 USB 设备（Android 手机）何时连接到我的主机设备（Android 手机），以便我可以将它们切换到 AOA 模式并将它们用作配件。基本上我有两部 Android 手机和一条 OTG 电缆，我希望它们能够相互通信。
我有一个线程不断枚举连接的 USB 设备：
UsbManager manager = (UsbManager)
context.getSystemService(Context.USB_SERVICE);
while (!m_stopRequested) {
boolean shouldNotify = false;
HashMap<String, UsbDevice> deviceMap = m_usbManager.getDeviceList();
for (Entry<String, UsbDevice> entry : deviceMap) {
UsbDevice device = entry.getValue();
if (m_usbManager.hasPermission(device)) {
int pid = device.getProductId();
if (device.getVendorId() == VID_GOOGLE(0x18D1) && (pid == ACCESSORY_PID(0x2D01) || pid == ACCESSORY_PID_ALT(0x2D00))) {
switchDeviceToAOAMode(device);
}
} else {
m_usbManager.requestPermission(device);
}
}
Thread.sleep(1000);
}
我还注册了一个 BroadcastReceiver 来接收 USB_PERMISSION 意图：
private final class USBReceiver extends BroadcastReceiver {
public void onReceive(Context context, Intent intent) {
MCSLogger.log(TAG, "Received permission result!");
String action = intent.getAction();
UsbDevice device = (UsbDevice) intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
if (ACTION_USB_PERMISSION.equals(action)) {
boolean res = intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false);
MCSLogger.log(TAG, "permission action for dev=" + device + " received " + res);
int pid = device.getProductId();
if (res && device.getVendorId() == VID_GOOGLE(0x18D1) && (pid == ACCESSORY_PID(0x2D01) || pid == ACCESSORY_PID_ALT(0x2D00))) {
connectAccessory()
}
}
}
};
这是我切换到 AOA 模式的方法：
private boolean switchDeviceToAOAMode(UsbDeviceConnection connection) {
byte ioBuffer[] = new byte[2];
int devVersion;
int response;
enter code here
response = connection.controlTransfer(0xC0, 51, 0, 0, ioBuffer, 2, 0);
if (response < 0) {
MCSLogger.log(TAG, "Error starting transfer control " + response);
return false;
}
devVersion = ioBuffer[1] << 8 | ioBuffer[0];
// sometimes hangs on the next transfer :( //WIN32 libusb only
// SystemClock.sleep(1000);
byte manufacturer[] = m_manufacturer.getBytes();
response = connection.controlTransfer(0x40, 52, 0, 0, manufacturer, manufacturer.length, 0);
if (response < 0) {
MCSLogger.log(TAG, "Error transfering manufacturer " + response);
return false;
}
byte modelName[] = m_modelName.getBytes();
response = connection.controlTransfer(0x40, 52, 0, 1, modelName, modelName.length, 0);
if (response < 0) {
MCSLogger.log(TAG, "Error transfering modelName " + response);
return false;
}
byte description[] = m_description.getBytes();
response = connection.controlTransfer(0x40, 52, 0, 2, description, description.length, 0);
if (response < 0) {
MCSLogger.log(TAG, "Error transfering description " + response);
return false;
}
byte version[] = m_version.getBytes();
response = connection.controlTransfer(0x40, 52, 0, 3, version, version.length, 0);
if (response < 0) {
MCSLogger.log(TAG, "Error transfering version " + response);
return false;
}
byte uri[] = m_uri.getBytes();
response = connection.controlTransfer(0x40, 52, 0, 4, uri, uri.length, 0);
if (response < 0) {
MCSLogger.log(TAG, "Error transfering uri " + response);
return false;
}
byte serialNumber[] = m_serialNumber.getBytes();
response = connection.controlTransfer(0x40, 52, 0, 5, serialNumber, serialNumber.length, 0);
if (response < 0) {
MCSLogger.log(TAG, "Error transfering serialNumber " + response);
return false;
}
MCSLogger.log(TAG, "Accessory Identification sent " + devVersion);
response = connection.controlTransfer(0x40, 53, 0, 0, null, 0, 0);
if (response < 0) {
MCSLogger.log(TAG, "Error ending transfer control " + response);
return false;
}
return true;
}
