Android :如何以编程方式连接/断开OTG

Question

我想在我的android设备上以编程方式连接和断开USB OTG (笔式驱动器、硬盘驱动器等)

对于USB，当连接到PC时，我使用以下路径绑定/解除绑定USB

/sys/bus/usb/drivers/usb/bind or unbind

以同样的方式，我想为OTG做这件事。

Answer 1

如果您对设备具有root访问权限，则可以使用我找到的几种方法。在应用程序中，您需要调用类似以下内容：

String[] commandConfigValue0 = { "su", "-c", "echo 0 > /sys/bus/usb/drivers/usb/usb1/bConfigurationValue", };
String[] commandConfigValue0 = { "su", "-c", "echo 0 > /sys/bus/usb/drivers/usb/usb1/bConfigurationValue", };   
String[] commandConfigValue1 = { "su", "-c", "echo 1 > /sys/bus/usb/drivers/usb/usb1/bConfigurationValue", };
String[] commandAuthorized0 = { "su", "-c", "echo 0 > /sys/bus/usb/drivers/usb/usb1/authorized", };
String[] commandAuthorized1 = { "su", "-c", "echo 1 > /sys/bus/usb/drivers/usb/usb1/authorized", };
Process p;
    try {
        p = Runtime.getRuntime().exec(commandAuthorized0);
        BufferedReader in = new BufferedReader(new InputStreamReader(p.getInputStream()));
        Log.d("MainActivity", "From unbind: " + in.toString());

        // I don't think "rebinding" works here but if you listen for the usb disconnect you can then call this second runtime command to bind the internal usbhub
        Thread.sleep(3000);

        p = Runtime.getRuntime().exec(commandAuthorized1);
        in = new BufferedReader(new InputStreamReader(p.getInputStream()));
        Log.d("MainActivity", "From bind: " + in.toString());
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (InterruptedException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

我查看了一些我拥有的新设备，这些设备没有根目录，也有/sys/bus/usb/drivers/usb/usb/usb 2，可能有/sys/bus/usb/drivers/usb/usb/usb。因此，根据您希望应用程序在其上运行的设备，您可能需要运行多个呼叫。

如果您希望在没有root访问权限的情况下执行此操作。我也在努力寻找解决方案！

祝好运!